Index: head/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
===================================================================
--- head/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCISelLowering.cpp	(revision 360133)
+++ head/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCISelLowering.cpp	(revision 360134)
@@ -1,15894 +1,15895 @@
 //===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the PPCISelLowering class.
 //
 //===----------------------------------------------------------------------===//
 
 #include "PPCISelLowering.h"
 #include "MCTargetDesc/PPCPredicates.h"
 #include "PPC.h"
 #include "PPCCCState.h"
 #include "PPCCallingConv.h"
 #include "PPCFrameLowering.h"
 #include "PPCInstrInfo.h"
 #include "PPCMachineFunctionInfo.h"
 #include "PPCPerfectShuffle.h"
 #include "PPCRegisterInfo.h"
 #include "PPCSubtarget.h"
 #include "PPCTargetMachine.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/None.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/CodeGen/CallingConvLower.h"
 #include "llvm/CodeGen/ISDOpcodes.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineLoopInfo.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/MachineOperand.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/RuntimeLibcalls.h"
 #include "llvm/CodeGen/SelectionDAG.h"
 #include "llvm/CodeGen/SelectionDAGNodes.h"
 #include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/IR/CallSite.h"
 #include "llvm/IR/CallingConv.h"
 #include "llvm/IR/Constant.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicsPowerPC.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Type.h"
 #include "llvm/IR/Use.h"
 #include "llvm/IR/Value.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSymbolXCOFF.h"
 #include "llvm/Support/AtomicOrdering.h"
 #include "llvm/Support/BranchProbability.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/KnownBits.h"
 #include "llvm/Support/MachineValueType.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdint>
 #include <iterator>
 #include <list>
 #include <utility>
 #include <vector>
 
 using namespace llvm;
 
 #define DEBUG_TYPE "ppc-lowering"
 
 static cl::opt<bool> DisablePPCPreinc("disable-ppc-preinc",
 cl::desc("disable preincrement load/store generation on PPC"), cl::Hidden);
 
 static cl::opt<bool> DisableILPPref("disable-ppc-ilp-pref",
 cl::desc("disable setting the node scheduling preference to ILP on PPC"), cl::Hidden);
 
 static cl::opt<bool> DisablePPCUnaligned("disable-ppc-unaligned",
 cl::desc("disable unaligned load/store generation on PPC"), cl::Hidden);
 
 static cl::opt<bool> DisableSCO("disable-ppc-sco",
 cl::desc("disable sibling call optimization on ppc"), cl::Hidden);
 
 static cl::opt<bool> DisableInnermostLoopAlign32("disable-ppc-innermost-loop-align32",
 cl::desc("don't always align innermost loop to 32 bytes on ppc"), cl::Hidden);
 
 static cl::opt<bool> EnableQuadPrecision("enable-ppc-quad-precision",
 cl::desc("enable quad precision float support on ppc"), cl::Hidden);
 
 static cl::opt<bool> UseAbsoluteJumpTables("ppc-use-absolute-jumptables",
 cl::desc("use absolute jump tables on ppc"), cl::Hidden);
 
 STATISTIC(NumTailCalls, "Number of tail calls");
 STATISTIC(NumSiblingCalls, "Number of sibling calls");
 
 static bool isNByteElemShuffleMask(ShuffleVectorSDNode *, unsigned, int);
 
 static SDValue widenVec(SelectionDAG &DAG, SDValue Vec, const SDLoc &dl);
 
 // FIXME: Remove this once the bug has been fixed!
 extern cl::opt<bool> ANDIGlueBug;
 
 PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
                                      const PPCSubtarget &STI)
     : TargetLowering(TM), Subtarget(STI) {
   // On PPC32/64, arguments smaller than 4/8 bytes are extended, so all
   // arguments are at least 4/8 bytes aligned.
   bool isPPC64 = Subtarget.isPPC64();
   setMinStackArgumentAlignment(isPPC64 ? Align(8) : Align(4));
 
   // Set up the register classes.
   addRegisterClass(MVT::i32, &PPC::GPRCRegClass);
   if (!useSoftFloat()) {
     if (hasSPE()) {
       addRegisterClass(MVT::f32, &PPC::GPRCRegClass);
       addRegisterClass(MVT::f64, &PPC::SPERCRegClass);
     } else {
       addRegisterClass(MVT::f32, &PPC::F4RCRegClass);
       addRegisterClass(MVT::f64, &PPC::F8RCRegClass);
     }
   }
 
   // Match BITREVERSE to customized fast code sequence in the td file.
   setOperationAction(ISD::BITREVERSE, MVT::i32, Legal);
   setOperationAction(ISD::BITREVERSE, MVT::i64, Legal);
 
   // Sub-word ATOMIC_CMP_SWAP need to ensure that the input is zero-extended.
   setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Custom);
 
   // PowerPC has an i16 but no i8 (or i1) SEXTLOAD.
   for (MVT VT : MVT::integer_valuetypes()) {
     setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
     setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Expand);
   }
 
   setTruncStoreAction(MVT::f64, MVT::f32, Expand);
 
   // PowerPC has pre-inc load and store's.
   setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
   setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
   setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
   setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
   setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
   setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
   setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
   setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
   setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
   setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
   if (!Subtarget.hasSPE()) {
     setIndexedLoadAction(ISD::PRE_INC, MVT::f32, Legal);
     setIndexedLoadAction(ISD::PRE_INC, MVT::f64, Legal);
     setIndexedStoreAction(ISD::PRE_INC, MVT::f32, Legal);
     setIndexedStoreAction(ISD::PRE_INC, MVT::f64, Legal);
   }
 
   // PowerPC uses ADDC/ADDE/SUBC/SUBE to propagate carry.
   const MVT ScalarIntVTs[] = { MVT::i32, MVT::i64 };
   for (MVT VT : ScalarIntVTs) {
     setOperationAction(ISD::ADDC, VT, Legal);
     setOperationAction(ISD::ADDE, VT, Legal);
     setOperationAction(ISD::SUBC, VT, Legal);
     setOperationAction(ISD::SUBE, VT, Legal);
   }
 
   if (Subtarget.useCRBits()) {
     setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
 
     if (isPPC64 || Subtarget.hasFPCVT()) {
       setOperationAction(ISD::SINT_TO_FP, MVT::i1, Promote);
       AddPromotedToType (ISD::SINT_TO_FP, MVT::i1,
                          isPPC64 ? MVT::i64 : MVT::i32);
       setOperationAction(ISD::UINT_TO_FP, MVT::i1, Promote);
       AddPromotedToType(ISD::UINT_TO_FP, MVT::i1,
                         isPPC64 ? MVT::i64 : MVT::i32);
     } else {
       setOperationAction(ISD::SINT_TO_FP, MVT::i1, Custom);
       setOperationAction(ISD::UINT_TO_FP, MVT::i1, Custom);
     }
 
     // PowerPC does not support direct load/store of condition registers.
     setOperationAction(ISD::LOAD, MVT::i1, Custom);
     setOperationAction(ISD::STORE, MVT::i1, Custom);
 
     // FIXME: Remove this once the ANDI glue bug is fixed:
     if (ANDIGlueBug)
       setOperationAction(ISD::TRUNCATE, MVT::i1, Custom);
 
     for (MVT VT : MVT::integer_valuetypes()) {
       setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
       setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
       setTruncStoreAction(VT, MVT::i1, Expand);
     }
 
     addRegisterClass(MVT::i1, &PPC::CRBITRCRegClass);
   }
 
   // Expand ppcf128 to i32 by hand for the benefit of llvm-gcc bootstrap on
   // PPC (the libcall is not available).
   setOperationAction(ISD::FP_TO_SINT, MVT::ppcf128, Custom);
   setOperationAction(ISD::FP_TO_UINT, MVT::ppcf128, Custom);
 
   // We do not currently implement these libm ops for PowerPC.
   setOperationAction(ISD::FFLOOR, MVT::ppcf128, Expand);
   setOperationAction(ISD::FCEIL,  MVT::ppcf128, Expand);
   setOperationAction(ISD::FTRUNC, MVT::ppcf128, Expand);
   setOperationAction(ISD::FRINT,  MVT::ppcf128, Expand);
   setOperationAction(ISD::FNEARBYINT, MVT::ppcf128, Expand);
   setOperationAction(ISD::FREM, MVT::ppcf128, Expand);
 
   // PowerPC has no SREM/UREM instructions unless we are on P9
   // On P9 we may use a hardware instruction to compute the remainder.
   // The instructions are not legalized directly because in the cases where the
   // result of both the remainder and the division is required it is more
   // efficient to compute the remainder from the result of the division rather
   // than use the remainder instruction.
   if (Subtarget.isISA3_0()) {
     setOperationAction(ISD::SREM, MVT::i32, Custom);
     setOperationAction(ISD::UREM, MVT::i32, Custom);
     setOperationAction(ISD::SREM, MVT::i64, Custom);
     setOperationAction(ISD::UREM, MVT::i64, Custom);
   } else {
     setOperationAction(ISD::SREM, MVT::i32, Expand);
     setOperationAction(ISD::UREM, MVT::i32, Expand);
     setOperationAction(ISD::SREM, MVT::i64, Expand);
     setOperationAction(ISD::UREM, MVT::i64, Expand);
   }
 
   // Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
   setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
   setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
   setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
   setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
   setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
   setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
   setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
   setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
 
   // We don't support sin/cos/sqrt/fmod/pow
   setOperationAction(ISD::FSIN , MVT::f64, Expand);
   setOperationAction(ISD::FCOS , MVT::f64, Expand);
   setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
   setOperationAction(ISD::FREM , MVT::f64, Expand);
   setOperationAction(ISD::FPOW , MVT::f64, Expand);
   setOperationAction(ISD::FSIN , MVT::f32, Expand);
   setOperationAction(ISD::FCOS , MVT::f32, Expand);
   setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
   setOperationAction(ISD::FREM , MVT::f32, Expand);
   setOperationAction(ISD::FPOW , MVT::f32, Expand);
   if (Subtarget.hasSPE()) {
     setOperationAction(ISD::FMA  , MVT::f64, Expand);
     setOperationAction(ISD::FMA  , MVT::f32, Expand);
   } else {
     setOperationAction(ISD::FMA  , MVT::f64, Legal);
     setOperationAction(ISD::FMA  , MVT::f32, Legal);
   }
 
   setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
 
   // If we're enabling GP optimizations, use hardware square root
   if (!Subtarget.hasFSQRT() &&
       !(TM.Options.UnsafeFPMath && Subtarget.hasFRSQRTE() &&
         Subtarget.hasFRE()))
     setOperationAction(ISD::FSQRT, MVT::f64, Expand);
 
   if (!Subtarget.hasFSQRT() &&
       !(TM.Options.UnsafeFPMath && Subtarget.hasFRSQRTES() &&
         Subtarget.hasFRES()))
     setOperationAction(ISD::FSQRT, MVT::f32, Expand);
 
   if (Subtarget.hasFCPSGN()) {
     setOperationAction(ISD::FCOPYSIGN, MVT::f64, Legal);
     setOperationAction(ISD::FCOPYSIGN, MVT::f32, Legal);
   } else {
     setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
     setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
   }
 
   if (Subtarget.hasFPRND()) {
     setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
     setOperationAction(ISD::FCEIL,  MVT::f64, Legal);
     setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
     setOperationAction(ISD::FROUND, MVT::f64, Legal);
 
     setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
     setOperationAction(ISD::FCEIL,  MVT::f32, Legal);
     setOperationAction(ISD::FTRUNC, MVT::f32, Legal);
     setOperationAction(ISD::FROUND, MVT::f32, Legal);
   }
 
   // PowerPC does not have BSWAP, but we can use vector BSWAP instruction xxbrd
   // to speed up scalar BSWAP64.
   // CTPOP or CTTZ were introduced in P8/P9 respectively
   setOperationAction(ISD::BSWAP, MVT::i32  , Expand);
   if (Subtarget.hasP9Vector())
     setOperationAction(ISD::BSWAP, MVT::i64  , Custom);
   else
     setOperationAction(ISD::BSWAP, MVT::i64  , Expand);
   if (Subtarget.isISA3_0()) {
     setOperationAction(ISD::CTTZ , MVT::i32  , Legal);
     setOperationAction(ISD::CTTZ , MVT::i64  , Legal);
   } else {
     setOperationAction(ISD::CTTZ , MVT::i32  , Expand);
     setOperationAction(ISD::CTTZ , MVT::i64  , Expand);
   }
 
   if (Subtarget.hasPOPCNTD() == PPCSubtarget::POPCNTD_Fast) {
     setOperationAction(ISD::CTPOP, MVT::i32  , Legal);
     setOperationAction(ISD::CTPOP, MVT::i64  , Legal);
   } else {
     setOperationAction(ISD::CTPOP, MVT::i32  , Expand);
     setOperationAction(ISD::CTPOP, MVT::i64  , Expand);
   }
 
   // PowerPC does not have ROTR
   setOperationAction(ISD::ROTR, MVT::i32   , Expand);
   setOperationAction(ISD::ROTR, MVT::i64   , Expand);
 
   if (!Subtarget.useCRBits()) {
     // PowerPC does not have Select
     setOperationAction(ISD::SELECT, MVT::i32, Expand);
     setOperationAction(ISD::SELECT, MVT::i64, Expand);
     setOperationAction(ISD::SELECT, MVT::f32, Expand);
     setOperationAction(ISD::SELECT, MVT::f64, Expand);
   }
 
   // PowerPC wants to turn select_cc of FP into fsel when possible.
   setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
   setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
 
   // PowerPC wants to optimize integer setcc a bit
   if (!Subtarget.useCRBits())
     setOperationAction(ISD::SETCC, MVT::i32, Custom);
 
   // PowerPC does not have BRCOND which requires SetCC
   if (!Subtarget.useCRBits())
     setOperationAction(ISD::BRCOND, MVT::Other, Expand);
 
   setOperationAction(ISD::BR_JT,  MVT::Other, Expand);
 
   if (Subtarget.hasSPE()) {
     // SPE has built-in conversions
     setOperationAction(ISD::FP_TO_SINT, MVT::i32, Legal);
     setOperationAction(ISD::SINT_TO_FP, MVT::i32, Legal);
     setOperationAction(ISD::UINT_TO_FP, MVT::i32, Legal);
   } else {
     // PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
     setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
 
     // PowerPC does not have [U|S]INT_TO_FP
     setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
     setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
   }
 
   if (Subtarget.hasDirectMove() && isPPC64) {
     setOperationAction(ISD::BITCAST, MVT::f32, Legal);
     setOperationAction(ISD::BITCAST, MVT::i32, Legal);
     setOperationAction(ISD::BITCAST, MVT::i64, Legal);
     setOperationAction(ISD::BITCAST, MVT::f64, Legal);
     if (TM.Options.UnsafeFPMath) {
       setOperationAction(ISD::LRINT, MVT::f64, Legal);
       setOperationAction(ISD::LRINT, MVT::f32, Legal);
       setOperationAction(ISD::LLRINT, MVT::f64, Legal);
       setOperationAction(ISD::LLRINT, MVT::f32, Legal);
       setOperationAction(ISD::LROUND, MVT::f64, Legal);
       setOperationAction(ISD::LROUND, MVT::f32, Legal);
       setOperationAction(ISD::LLROUND, MVT::f64, Legal);
       setOperationAction(ISD::LLROUND, MVT::f32, Legal);
     }
   } else {
     setOperationAction(ISD::BITCAST, MVT::f32, Expand);
     setOperationAction(ISD::BITCAST, MVT::i32, Expand);
     setOperationAction(ISD::BITCAST, MVT::i64, Expand);
     setOperationAction(ISD::BITCAST, MVT::f64, Expand);
   }
 
   // We cannot sextinreg(i1).  Expand to shifts.
   setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
 
   // NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
   // SjLj exception handling but a light-weight setjmp/longjmp replacement to
   // support continuation, user-level threading, and etc.. As a result, no
   // other SjLj exception interfaces are implemented and please don't build
   // your own exception handling based on them.
   // LLVM/Clang supports zero-cost DWARF exception handling.
   setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
   setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
 
   // We want to legalize GlobalAddress and ConstantPool nodes into the
   // appropriate instructions to materialize the address.
   setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
   setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
   setOperationAction(ISD::BlockAddress,  MVT::i32, Custom);
   setOperationAction(ISD::ConstantPool,  MVT::i32, Custom);
   setOperationAction(ISD::JumpTable,     MVT::i32, Custom);
   setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
   setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
   setOperationAction(ISD::BlockAddress,  MVT::i64, Custom);
   setOperationAction(ISD::ConstantPool,  MVT::i64, Custom);
   setOperationAction(ISD::JumpTable,     MVT::i64, Custom);
 
   // TRAP is legal.
   setOperationAction(ISD::TRAP, MVT::Other, Legal);
 
   // TRAMPOLINE is custom lowered.
   setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
   setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
 
   // VASTART needs to be custom lowered to use the VarArgsFrameIndex
   setOperationAction(ISD::VASTART           , MVT::Other, Custom);
 
   if (Subtarget.is64BitELFABI()) {
     // VAARG always uses double-word chunks, so promote anything smaller.
     setOperationAction(ISD::VAARG, MVT::i1, Promote);
     AddPromotedToType(ISD::VAARG, MVT::i1, MVT::i64);
     setOperationAction(ISD::VAARG, MVT::i8, Promote);
     AddPromotedToType(ISD::VAARG, MVT::i8, MVT::i64);
     setOperationAction(ISD::VAARG, MVT::i16, Promote);
     AddPromotedToType(ISD::VAARG, MVT::i16, MVT::i64);
     setOperationAction(ISD::VAARG, MVT::i32, Promote);
     AddPromotedToType(ISD::VAARG, MVT::i32, MVT::i64);
     setOperationAction(ISD::VAARG, MVT::Other, Expand);
   } else if (Subtarget.is32BitELFABI()) {
     // VAARG is custom lowered with the 32-bit SVR4 ABI.
     setOperationAction(ISD::VAARG, MVT::Other, Custom);
     setOperationAction(ISD::VAARG, MVT::i64, Custom);
   } else
     setOperationAction(ISD::VAARG, MVT::Other, Expand);
 
   // VACOPY is custom lowered with the 32-bit SVR4 ABI.
   if (Subtarget.is32BitELFABI())
     setOperationAction(ISD::VACOPY            , MVT::Other, Custom);
   else
     setOperationAction(ISD::VACOPY            , MVT::Other, Expand);
 
   // Use the default implementation.
   setOperationAction(ISD::VAEND             , MVT::Other, Expand);
   setOperationAction(ISD::STACKSAVE         , MVT::Other, Expand);
   setOperationAction(ISD::STACKRESTORE      , MVT::Other, Custom);
   setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32  , Custom);
   setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64  , Custom);
   setOperationAction(ISD::GET_DYNAMIC_AREA_OFFSET, MVT::i32, Custom);
   setOperationAction(ISD::GET_DYNAMIC_AREA_OFFSET, MVT::i64, Custom);
   setOperationAction(ISD::EH_DWARF_CFA, MVT::i32, Custom);
   setOperationAction(ISD::EH_DWARF_CFA, MVT::i64, Custom);
 
   // We want to custom lower some of our intrinsics.
   setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
 
   // To handle counter-based loop conditions.
   setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i1, Custom);
 
   setOperationAction(ISD::INTRINSIC_VOID, MVT::i8, Custom);
   setOperationAction(ISD::INTRINSIC_VOID, MVT::i16, Custom);
   setOperationAction(ISD::INTRINSIC_VOID, MVT::i32, Custom);
   setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
 
   // Comparisons that require checking two conditions.
   if (Subtarget.hasSPE()) {
     setCondCodeAction(ISD::SETO, MVT::f32, Expand);
     setCondCodeAction(ISD::SETO, MVT::f64, Expand);
     setCondCodeAction(ISD::SETUO, MVT::f32, Expand);
     setCondCodeAction(ISD::SETUO, MVT::f64, Expand);
   }
   setCondCodeAction(ISD::SETULT, MVT::f32, Expand);
   setCondCodeAction(ISD::SETULT, MVT::f64, Expand);
   setCondCodeAction(ISD::SETUGT, MVT::f32, Expand);
   setCondCodeAction(ISD::SETUGT, MVT::f64, Expand);
   setCondCodeAction(ISD::SETUEQ, MVT::f32, Expand);
   setCondCodeAction(ISD::SETUEQ, MVT::f64, Expand);
   setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
   setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
   setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
   setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
   setCondCodeAction(ISD::SETONE, MVT::f32, Expand);
   setCondCodeAction(ISD::SETONE, MVT::f64, Expand);
 
   if (Subtarget.has64BitSupport()) {
     // They also have instructions for converting between i64 and fp.
     setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
     setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
     setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
     setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
     // This is just the low 32 bits of a (signed) fp->i64 conversion.
     // We cannot do this with Promote because i64 is not a legal type.
     setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
 
     if (Subtarget.hasLFIWAX() || Subtarget.isPPC64())
       setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
   } else {
     // PowerPC does not have FP_TO_UINT on 32-bit implementations.
     if (Subtarget.hasSPE())
       setOperationAction(ISD::FP_TO_UINT, MVT::i32, Legal);
     else
       setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
   }
 
   // With the instructions enabled under FPCVT, we can do everything.
   if (Subtarget.hasFPCVT()) {
     if (Subtarget.has64BitSupport()) {
       setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
       setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
       setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
       setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);
     }
 
     setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
     setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
     setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
     setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
   }
 
   if (Subtarget.use64BitRegs()) {
     // 64-bit PowerPC implementations can support i64 types directly
     addRegisterClass(MVT::i64, &PPC::G8RCRegClass);
     // BUILD_PAIR can't be handled natively, and should be expanded to shl/or
     setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
     // 64-bit PowerPC wants to expand i128 shifts itself.
     setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
     setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
     setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
   } else {
     // 32-bit PowerPC wants to expand i64 shifts itself.
     setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
     setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
     setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
   }
 
   if (Subtarget.hasVSX()) {
     setOperationAction(ISD::FMAXNUM_IEEE, MVT::f64, Legal);
     setOperationAction(ISD::FMAXNUM_IEEE, MVT::f32, Legal);
     setOperationAction(ISD::FMINNUM_IEEE, MVT::f64, Legal);
     setOperationAction(ISD::FMINNUM_IEEE, MVT::f32, Legal);
   }
 
   if (Subtarget.hasAltivec()) {
     // First set operation action for all vector types to expand. Then we
     // will selectively turn on ones that can be effectively codegen'd.
     for (MVT VT : MVT::fixedlen_vector_valuetypes()) {
       // add/sub are legal for all supported vector VT's.
       setOperationAction(ISD::ADD, VT, Legal);
       setOperationAction(ISD::SUB, VT, Legal);
 
       // For v2i64, these are only valid with P8Vector. This is corrected after
       // the loop.
       if (VT.getSizeInBits() <= 128 && VT.getScalarSizeInBits() <= 64) {
         setOperationAction(ISD::SMAX, VT, Legal);
         setOperationAction(ISD::SMIN, VT, Legal);
         setOperationAction(ISD::UMAX, VT, Legal);
         setOperationAction(ISD::UMIN, VT, Legal);
       }
       else {
         setOperationAction(ISD::SMAX, VT, Expand);
         setOperationAction(ISD::SMIN, VT, Expand);
         setOperationAction(ISD::UMAX, VT, Expand);
         setOperationAction(ISD::UMIN, VT, Expand);
       }
 
       if (Subtarget.hasVSX()) {
         setOperationAction(ISD::FMAXNUM, VT, Legal);
         setOperationAction(ISD::FMINNUM, VT, Legal);
       }
 
       // Vector instructions introduced in P8
       if (Subtarget.hasP8Altivec() && (VT.SimpleTy != MVT::v1i128)) {
         setOperationAction(ISD::CTPOP, VT, Legal);
         setOperationAction(ISD::CTLZ, VT, Legal);
       }
       else {
         setOperationAction(ISD::CTPOP, VT, Expand);
         setOperationAction(ISD::CTLZ, VT, Expand);
       }
 
       // Vector instructions introduced in P9
       if (Subtarget.hasP9Altivec() && (VT.SimpleTy != MVT::v1i128))
         setOperationAction(ISD::CTTZ, VT, Legal);
       else
         setOperationAction(ISD::CTTZ, VT, Expand);
 
       // We promote all shuffles to v16i8.
       setOperationAction(ISD::VECTOR_SHUFFLE, VT, Promote);
       AddPromotedToType (ISD::VECTOR_SHUFFLE, VT, MVT::v16i8);
 
       // We promote all non-typed operations to v4i32.
       setOperationAction(ISD::AND   , VT, Promote);
       AddPromotedToType (ISD::AND   , VT, MVT::v4i32);
       setOperationAction(ISD::OR    , VT, Promote);
       AddPromotedToType (ISD::OR    , VT, MVT::v4i32);
       setOperationAction(ISD::XOR   , VT, Promote);
       AddPromotedToType (ISD::XOR   , VT, MVT::v4i32);
       setOperationAction(ISD::LOAD  , VT, Promote);
       AddPromotedToType (ISD::LOAD  , VT, MVT::v4i32);
       setOperationAction(ISD::SELECT, VT, Promote);
       AddPromotedToType (ISD::SELECT, VT, MVT::v4i32);
       setOperationAction(ISD::VSELECT, VT, Legal);
       setOperationAction(ISD::SELECT_CC, VT, Promote);
       AddPromotedToType (ISD::SELECT_CC, VT, MVT::v4i32);
       setOperationAction(ISD::STORE, VT, Promote);
       AddPromotedToType (ISD::STORE, VT, MVT::v4i32);
 
       // No other operations are legal.
       setOperationAction(ISD::MUL , VT, Expand);
       setOperationAction(ISD::SDIV, VT, Expand);
       setOperationAction(ISD::SREM, VT, Expand);
       setOperationAction(ISD::UDIV, VT, Expand);
       setOperationAction(ISD::UREM, VT, Expand);
       setOperationAction(ISD::FDIV, VT, Expand);
       setOperationAction(ISD::FREM, VT, Expand);
       setOperationAction(ISD::FNEG, VT, Expand);
       setOperationAction(ISD::FSQRT, VT, Expand);
       setOperationAction(ISD::FLOG, VT, Expand);
       setOperationAction(ISD::FLOG10, VT, Expand);
       setOperationAction(ISD::FLOG2, VT, Expand);
       setOperationAction(ISD::FEXP, VT, Expand);
       setOperationAction(ISD::FEXP2, VT, Expand);
       setOperationAction(ISD::FSIN, VT, Expand);
       setOperationAction(ISD::FCOS, VT, Expand);
       setOperationAction(ISD::FABS, VT, Expand);
       setOperationAction(ISD::FFLOOR, VT, Expand);
       setOperationAction(ISD::FCEIL,  VT, Expand);
       setOperationAction(ISD::FTRUNC, VT, Expand);
       setOperationAction(ISD::FRINT,  VT, Expand);
       setOperationAction(ISD::FNEARBYINT, VT, Expand);
       setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Expand);
       setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
       setOperationAction(ISD::BUILD_VECTOR, VT, Expand);
       setOperationAction(ISD::MULHU, VT, Expand);
       setOperationAction(ISD::MULHS, VT, Expand);
       setOperationAction(ISD::UMUL_LOHI, VT, Expand);
       setOperationAction(ISD::SMUL_LOHI, VT, Expand);
       setOperationAction(ISD::UDIVREM, VT, Expand);
       setOperationAction(ISD::SDIVREM, VT, Expand);
       setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Expand);
       setOperationAction(ISD::FPOW, VT, Expand);
       setOperationAction(ISD::BSWAP, VT, Expand);
       setOperationAction(ISD::SIGN_EXTEND_INREG, VT, Expand);
       setOperationAction(ISD::ROTL, VT, Expand);
       setOperationAction(ISD::ROTR, VT, Expand);
 
       for (MVT InnerVT : MVT::fixedlen_vector_valuetypes()) {
         setTruncStoreAction(VT, InnerVT, Expand);
         setLoadExtAction(ISD::SEXTLOAD, VT, InnerVT, Expand);
         setLoadExtAction(ISD::ZEXTLOAD, VT, InnerVT, Expand);
         setLoadExtAction(ISD::EXTLOAD, VT, InnerVT, Expand);
       }
     }
     if (!Subtarget.hasP8Vector()) {
       setOperationAction(ISD::SMAX, MVT::v2i64, Expand);
       setOperationAction(ISD::SMIN, MVT::v2i64, Expand);
       setOperationAction(ISD::UMAX, MVT::v2i64, Expand);
       setOperationAction(ISD::UMIN, MVT::v2i64, Expand);
     }
 
     for (auto VT : {MVT::v2i64, MVT::v4i32, MVT::v8i16, MVT::v16i8})
       setOperationAction(ISD::ABS, VT, Custom);
 
     // We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
     // with merges, splats, etc.
     setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
 
     // Vector truncates to sub-word integer that fit in an Altivec/VSX register
     // are cheap, so handle them before they get expanded to scalar.
     setOperationAction(ISD::TRUNCATE, MVT::v8i8, Custom);
     setOperationAction(ISD::TRUNCATE, MVT::v4i8, Custom);
     setOperationAction(ISD::TRUNCATE, MVT::v2i8, Custom);
     setOperationAction(ISD::TRUNCATE, MVT::v4i16, Custom);
     setOperationAction(ISD::TRUNCATE, MVT::v2i16, Custom);
 
     setOperationAction(ISD::AND   , MVT::v4i32, Legal);
     setOperationAction(ISD::OR    , MVT::v4i32, Legal);
     setOperationAction(ISD::XOR   , MVT::v4i32, Legal);
     setOperationAction(ISD::LOAD  , MVT::v4i32, Legal);
     setOperationAction(ISD::SELECT, MVT::v4i32,
                        Subtarget.useCRBits() ? Legal : Expand);
     setOperationAction(ISD::STORE , MVT::v4i32, Legal);
     setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
     setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
     setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
     setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
     setOperationAction(ISD::FFLOOR, MVT::v4f32, Legal);
     setOperationAction(ISD::FCEIL, MVT::v4f32, Legal);
     setOperationAction(ISD::FTRUNC, MVT::v4f32, Legal);
     setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Legal);
 
     // Without hasP8Altivec set, v2i64 SMAX isn't available.
     // But ABS custom lowering requires SMAX support.
     if (!Subtarget.hasP8Altivec())
       setOperationAction(ISD::ABS, MVT::v2i64, Expand);
 
     // With hasAltivec set, we can lower ISD::ROTL to vrl(b|h|w).
     if (Subtarget.hasAltivec())
       for (auto VT : {MVT::v4i32, MVT::v8i16, MVT::v16i8})
         setOperationAction(ISD::ROTL, VT, Legal);
     // With hasP8Altivec set, we can lower ISD::ROTL to vrld.
     if (Subtarget.hasP8Altivec())
       setOperationAction(ISD::ROTL, MVT::v2i64, Legal);
 
     addRegisterClass(MVT::v4f32, &PPC::VRRCRegClass);
     addRegisterClass(MVT::v4i32, &PPC::VRRCRegClass);
     addRegisterClass(MVT::v8i16, &PPC::VRRCRegClass);
     addRegisterClass(MVT::v16i8, &PPC::VRRCRegClass);
 
     setOperationAction(ISD::MUL, MVT::v4f32, Legal);
     setOperationAction(ISD::FMA, MVT::v4f32, Legal);
 
     if (TM.Options.UnsafeFPMath || Subtarget.hasVSX()) {
       setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
       setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
     }
 
     if (Subtarget.hasP8Altivec())
       setOperationAction(ISD::MUL, MVT::v4i32, Legal);
     else
       setOperationAction(ISD::MUL, MVT::v4i32, Custom);
 
     setOperationAction(ISD::MUL, MVT::v8i16, Custom);
     setOperationAction(ISD::MUL, MVT::v16i8, Custom);
 
     setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
     setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
 
     setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
 
     // Altivec does not contain unordered floating-point compare instructions
     setCondCodeAction(ISD::SETUO, MVT::v4f32, Expand);
     setCondCodeAction(ISD::SETUEQ, MVT::v4f32, Expand);
     setCondCodeAction(ISD::SETO,   MVT::v4f32, Expand);
     setCondCodeAction(ISD::SETONE, MVT::v4f32, Expand);
 
     if (Subtarget.hasVSX()) {
       setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2f64, Legal);
       setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Legal);
       if (Subtarget.hasP8Vector()) {
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Legal);
       }
       if (Subtarget.hasDirectMove() && isPPC64) {
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Legal);
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Legal);
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Legal);
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v2i64, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i8, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i16, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Legal);
       }
       setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Legal);
 
       // The nearbyint variants are not allowed to raise the inexact exception
       // so we can only code-gen them with unsafe math.
       if (TM.Options.UnsafeFPMath) {
         setOperationAction(ISD::FNEARBYINT, MVT::f64, Legal);
         setOperationAction(ISD::FNEARBYINT, MVT::f32, Legal);
       }
 
       setOperationAction(ISD::FFLOOR, MVT::v2f64, Legal);
       setOperationAction(ISD::FCEIL, MVT::v2f64, Legal);
       setOperationAction(ISD::FTRUNC, MVT::v2f64, Legal);
       setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Legal);
       setOperationAction(ISD::FROUND, MVT::v2f64, Legal);
       setOperationAction(ISD::FROUND, MVT::f64, Legal);
 
       setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Legal);
       setOperationAction(ISD::FROUND, MVT::v4f32, Legal);
       setOperationAction(ISD::FROUND, MVT::f32, Legal);
 
       setOperationAction(ISD::MUL, MVT::v2f64, Legal);
       setOperationAction(ISD::FMA, MVT::v2f64, Legal);
 
       setOperationAction(ISD::FDIV, MVT::v2f64, Legal);
       setOperationAction(ISD::FSQRT, MVT::v2f64, Legal);
 
       // Share the Altivec comparison restrictions.
       setCondCodeAction(ISD::SETUO, MVT::v2f64, Expand);
       setCondCodeAction(ISD::SETUEQ, MVT::v2f64, Expand);
       setCondCodeAction(ISD::SETO,   MVT::v2f64, Expand);
       setCondCodeAction(ISD::SETONE, MVT::v2f64, Expand);
 
       setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
       setOperationAction(ISD::STORE, MVT::v2f64, Legal);
 
       setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f64, Legal);
 
       if (Subtarget.hasP8Vector())
         addRegisterClass(MVT::f32, &PPC::VSSRCRegClass);
 
       addRegisterClass(MVT::f64, &PPC::VSFRCRegClass);
 
       addRegisterClass(MVT::v4i32, &PPC::VSRCRegClass);
       addRegisterClass(MVT::v4f32, &PPC::VSRCRegClass);
       addRegisterClass(MVT::v2f64, &PPC::VSRCRegClass);
 
       if (Subtarget.hasP8Altivec()) {
         setOperationAction(ISD::SHL, MVT::v2i64, Legal);
         setOperationAction(ISD::SRA, MVT::v2i64, Legal);
         setOperationAction(ISD::SRL, MVT::v2i64, Legal);
 
         // 128 bit shifts can be accomplished via 3 instructions for SHL and
         // SRL, but not for SRA because of the instructions available:
         // VS{RL} and VS{RL}O. However due to direct move costs, it's not worth
         // doing
         setOperationAction(ISD::SHL, MVT::v1i128, Expand);
         setOperationAction(ISD::SRL, MVT::v1i128, Expand);
         setOperationAction(ISD::SRA, MVT::v1i128, Expand);
 
         setOperationAction(ISD::SETCC, MVT::v2i64, Legal);
       }
       else {
         setOperationAction(ISD::SHL, MVT::v2i64, Expand);
         setOperationAction(ISD::SRA, MVT::v2i64, Expand);
         setOperationAction(ISD::SRL, MVT::v2i64, Expand);
 
         setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
 
         // VSX v2i64 only supports non-arithmetic operations.
         setOperationAction(ISD::ADD, MVT::v2i64, Expand);
         setOperationAction(ISD::SUB, MVT::v2i64, Expand);
       }
 
       setOperationAction(ISD::LOAD, MVT::v2i64, Promote);
       AddPromotedToType (ISD::LOAD, MVT::v2i64, MVT::v2f64);
       setOperationAction(ISD::STORE, MVT::v2i64, Promote);
       AddPromotedToType (ISD::STORE, MVT::v2i64, MVT::v2f64);
 
       setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i64, Legal);
 
       setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Legal);
       setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Legal);
       setOperationAction(ISD::FP_TO_SINT, MVT::v2i64, Legal);
       setOperationAction(ISD::FP_TO_UINT, MVT::v2i64, Legal);
 
       // Custom handling for partial vectors of integers converted to
       // floating point. We already have optimal handling for v2i32 through
       // the DAG combine, so those aren't necessary.
       setOperationAction(ISD::UINT_TO_FP, MVT::v2i8, Custom);
       setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Custom);
       setOperationAction(ISD::UINT_TO_FP, MVT::v2i16, Custom);
       setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Custom);
       setOperationAction(ISD::SINT_TO_FP, MVT::v2i8, Custom);
       setOperationAction(ISD::SINT_TO_FP, MVT::v4i8, Custom);
       setOperationAction(ISD::SINT_TO_FP, MVT::v2i16, Custom);
       setOperationAction(ISD::SINT_TO_FP, MVT::v4i16, Custom);
 
       setOperationAction(ISD::FNEG, MVT::v4f32, Legal);
       setOperationAction(ISD::FNEG, MVT::v2f64, Legal);
       setOperationAction(ISD::FABS, MVT::v4f32, Legal);
       setOperationAction(ISD::FABS, MVT::v2f64, Legal);
       setOperationAction(ISD::FCOPYSIGN, MVT::v4f32, Legal);
       setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Legal);
 
       if (Subtarget.hasDirectMove())
         setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64, Custom);
       setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64, Custom);
 
       addRegisterClass(MVT::v2i64, &PPC::VSRCRegClass);
     }
 
     if (Subtarget.hasP8Altivec()) {
       addRegisterClass(MVT::v2i64, &PPC::VRRCRegClass);
       addRegisterClass(MVT::v1i128, &PPC::VRRCRegClass);
     }
 
     if (Subtarget.hasP9Vector()) {
       setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
       setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
 
       // 128 bit shifts can be accomplished via 3 instructions for SHL and
       // SRL, but not for SRA because of the instructions available:
       // VS{RL} and VS{RL}O.
       setOperationAction(ISD::SHL, MVT::v1i128, Legal);
       setOperationAction(ISD::SRL, MVT::v1i128, Legal);
       setOperationAction(ISD::SRA, MVT::v1i128, Expand);
 
       if (EnableQuadPrecision) {
         addRegisterClass(MVT::f128, &PPC::VRRCRegClass);
         setOperationAction(ISD::FADD, MVT::f128, Legal);
         setOperationAction(ISD::FSUB, MVT::f128, Legal);
         setOperationAction(ISD::FDIV, MVT::f128, Legal);
         setOperationAction(ISD::FMUL, MVT::f128, Legal);
         setOperationAction(ISD::FP_EXTEND, MVT::f128, Legal);
         // No extending loads to f128 on PPC.
         for (MVT FPT : MVT::fp_valuetypes())
           setLoadExtAction(ISD::EXTLOAD, MVT::f128, FPT, Expand);
         setOperationAction(ISD::FMA, MVT::f128, Legal);
         setCondCodeAction(ISD::SETULT, MVT::f128, Expand);
         setCondCodeAction(ISD::SETUGT, MVT::f128, Expand);
         setCondCodeAction(ISD::SETUEQ, MVT::f128, Expand);
         setCondCodeAction(ISD::SETOGE, MVT::f128, Expand);
         setCondCodeAction(ISD::SETOLE, MVT::f128, Expand);
         setCondCodeAction(ISD::SETONE, MVT::f128, Expand);
 
         setOperationAction(ISD::FTRUNC, MVT::f128, Legal);
         setOperationAction(ISD::FRINT, MVT::f128, Legal);
         setOperationAction(ISD::FFLOOR, MVT::f128, Legal);
         setOperationAction(ISD::FCEIL, MVT::f128, Legal);
         setOperationAction(ISD::FNEARBYINT, MVT::f128, Legal);
         setOperationAction(ISD::FROUND, MVT::f128, Legal);
 
         setOperationAction(ISD::SELECT, MVT::f128, Expand);
         setOperationAction(ISD::FP_ROUND, MVT::f64, Legal);
         setOperationAction(ISD::FP_ROUND, MVT::f32, Legal);
         setTruncStoreAction(MVT::f128, MVT::f64, Expand);
         setTruncStoreAction(MVT::f128, MVT::f32, Expand);
         setOperationAction(ISD::BITCAST, MVT::i128, Custom);
         // No implementation for these ops for PowerPC.
         setOperationAction(ISD::FSIN , MVT::f128, Expand);
         setOperationAction(ISD::FCOS , MVT::f128, Expand);
         setOperationAction(ISD::FPOW, MVT::f128, Expand);
         setOperationAction(ISD::FPOWI, MVT::f128, Expand);
         setOperationAction(ISD::FREM, MVT::f128, Expand);
       }
       setOperationAction(ISD::FP_EXTEND, MVT::v2f32, Custom);
       setOperationAction(ISD::BSWAP, MVT::v8i16, Legal);
       setOperationAction(ISD::BSWAP, MVT::v4i32, Legal);
       setOperationAction(ISD::BSWAP, MVT::v2i64, Legal);
       setOperationAction(ISD::BSWAP, MVT::v1i128, Legal);
     }
 
     if (Subtarget.hasP9Altivec()) {
       setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
       setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Custom);
 
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i8,  Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i16, Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i32, Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i8,  Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i16, Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i32, Legal);
       setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i64, Legal);
     }
   }
 
   if (Subtarget.hasQPX()) {
     setOperationAction(ISD::FADD, MVT::v4f64, Legal);
     setOperationAction(ISD::FSUB, MVT::v4f64, Legal);
     setOperationAction(ISD::FMUL, MVT::v4f64, Legal);
     setOperationAction(ISD::FREM, MVT::v4f64, Expand);
 
     setOperationAction(ISD::FCOPYSIGN, MVT::v4f64, Legal);
     setOperationAction(ISD::FGETSIGN, MVT::v4f64, Expand);
 
     setOperationAction(ISD::LOAD  , MVT::v4f64, Custom);
     setOperationAction(ISD::STORE , MVT::v4f64, Custom);
 
     setTruncStoreAction(MVT::v4f64, MVT::v4f32, Custom);
     setLoadExtAction(ISD::EXTLOAD, MVT::v4f64, MVT::v4f32, Custom);
 
     if (!Subtarget.useCRBits())
       setOperationAction(ISD::SELECT, MVT::v4f64, Expand);
     setOperationAction(ISD::VSELECT, MVT::v4f64, Legal);
 
     setOperationAction(ISD::EXTRACT_VECTOR_ELT , MVT::v4f64, Legal);
     setOperationAction(ISD::INSERT_VECTOR_ELT , MVT::v4f64, Expand);
     setOperationAction(ISD::CONCAT_VECTORS , MVT::v4f64, Expand);
     setOperationAction(ISD::EXTRACT_SUBVECTOR , MVT::v4f64, Expand);
     setOperationAction(ISD::VECTOR_SHUFFLE , MVT::v4f64, Custom);
     setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f64, Legal);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v4f64, Custom);
 
     setOperationAction(ISD::FP_TO_SINT , MVT::v4f64, Legal);
     setOperationAction(ISD::FP_TO_UINT , MVT::v4f64, Expand);
 
     setOperationAction(ISD::FP_ROUND , MVT::v4f32, Legal);
     setOperationAction(ISD::FP_EXTEND, MVT::v4f64, Legal);
 
     setOperationAction(ISD::FNEG , MVT::v4f64, Legal);
     setOperationAction(ISD::FABS , MVT::v4f64, Legal);
     setOperationAction(ISD::FSIN , MVT::v4f64, Expand);
     setOperationAction(ISD::FCOS , MVT::v4f64, Expand);
     setOperationAction(ISD::FPOW , MVT::v4f64, Expand);
     setOperationAction(ISD::FLOG , MVT::v4f64, Expand);
     setOperationAction(ISD::FLOG2 , MVT::v4f64, Expand);
     setOperationAction(ISD::FLOG10 , MVT::v4f64, Expand);
     setOperationAction(ISD::FEXP , MVT::v4f64, Expand);
     setOperationAction(ISD::FEXP2 , MVT::v4f64, Expand);
 
     setOperationAction(ISD::FMINNUM, MVT::v4f64, Legal);
     setOperationAction(ISD::FMAXNUM, MVT::v4f64, Legal);
 
     setIndexedLoadAction(ISD::PRE_INC, MVT::v4f64, Legal);
     setIndexedStoreAction(ISD::PRE_INC, MVT::v4f64, Legal);
 
     addRegisterClass(MVT::v4f64, &PPC::QFRCRegClass);
 
     setOperationAction(ISD::FADD, MVT::v4f32, Legal);
     setOperationAction(ISD::FSUB, MVT::v4f32, Legal);
     setOperationAction(ISD::FMUL, MVT::v4f32, Legal);
     setOperationAction(ISD::FREM, MVT::v4f32, Expand);
 
     setOperationAction(ISD::FCOPYSIGN, MVT::v4f32, Legal);
     setOperationAction(ISD::FGETSIGN, MVT::v4f32, Expand);
 
     setOperationAction(ISD::LOAD  , MVT::v4f32, Custom);
     setOperationAction(ISD::STORE , MVT::v4f32, Custom);
 
     if (!Subtarget.useCRBits())
       setOperationAction(ISD::SELECT, MVT::v4f32, Expand);
     setOperationAction(ISD::VSELECT, MVT::v4f32, Legal);
 
     setOperationAction(ISD::EXTRACT_VECTOR_ELT , MVT::v4f32, Legal);
     setOperationAction(ISD::INSERT_VECTOR_ELT , MVT::v4f32, Expand);
     setOperationAction(ISD::CONCAT_VECTORS , MVT::v4f32, Expand);
     setOperationAction(ISD::EXTRACT_SUBVECTOR , MVT::v4f32, Expand);
     setOperationAction(ISD::VECTOR_SHUFFLE , MVT::v4f32, Custom);
     setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Legal);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
 
     setOperationAction(ISD::FP_TO_SINT , MVT::v4f32, Legal);
     setOperationAction(ISD::FP_TO_UINT , MVT::v4f32, Expand);
 
     setOperationAction(ISD::FNEG , MVT::v4f32, Legal);
     setOperationAction(ISD::FABS , MVT::v4f32, Legal);
     setOperationAction(ISD::FSIN , MVT::v4f32, Expand);
     setOperationAction(ISD::FCOS , MVT::v4f32, Expand);
     setOperationAction(ISD::FPOW , MVT::v4f32, Expand);
     setOperationAction(ISD::FLOG , MVT::v4f32, Expand);
     setOperationAction(ISD::FLOG2 , MVT::v4f32, Expand);
     setOperationAction(ISD::FLOG10 , MVT::v4f32, Expand);
     setOperationAction(ISD::FEXP , MVT::v4f32, Expand);
     setOperationAction(ISD::FEXP2 , MVT::v4f32, Expand);
 
     setOperationAction(ISD::FMINNUM, MVT::v4f32, Legal);
     setOperationAction(ISD::FMAXNUM, MVT::v4f32, Legal);
 
     setIndexedLoadAction(ISD::PRE_INC, MVT::v4f32, Legal);
     setIndexedStoreAction(ISD::PRE_INC, MVT::v4f32, Legal);
 
     addRegisterClass(MVT::v4f32, &PPC::QSRCRegClass);
 
     setOperationAction(ISD::AND , MVT::v4i1, Legal);
     setOperationAction(ISD::OR , MVT::v4i1, Legal);
     setOperationAction(ISD::XOR , MVT::v4i1, Legal);
 
     if (!Subtarget.useCRBits())
       setOperationAction(ISD::SELECT, MVT::v4i1, Expand);
     setOperationAction(ISD::VSELECT, MVT::v4i1, Legal);
 
     setOperationAction(ISD::LOAD  , MVT::v4i1, Custom);
     setOperationAction(ISD::STORE , MVT::v4i1, Custom);
 
     setOperationAction(ISD::EXTRACT_VECTOR_ELT , MVT::v4i1, Custom);
     setOperationAction(ISD::INSERT_VECTOR_ELT , MVT::v4i1, Expand);
     setOperationAction(ISD::CONCAT_VECTORS , MVT::v4i1, Expand);
     setOperationAction(ISD::EXTRACT_SUBVECTOR , MVT::v4i1, Expand);
     setOperationAction(ISD::VECTOR_SHUFFLE , MVT::v4i1, Custom);
     setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i1, Expand);
     setOperationAction(ISD::BUILD_VECTOR, MVT::v4i1, Custom);
 
     setOperationAction(ISD::SINT_TO_FP, MVT::v4i1, Custom);
     setOperationAction(ISD::UINT_TO_FP, MVT::v4i1, Custom);
 
     addRegisterClass(MVT::v4i1, &PPC::QBRCRegClass);
 
     setOperationAction(ISD::FFLOOR, MVT::v4f64, Legal);
     setOperationAction(ISD::FCEIL,  MVT::v4f64, Legal);
     setOperationAction(ISD::FTRUNC, MVT::v4f64, Legal);
     setOperationAction(ISD::FROUND, MVT::v4f64, Legal);
 
     setOperationAction(ISD::FFLOOR, MVT::v4f32, Legal);
     setOperationAction(ISD::FCEIL,  MVT::v4f32, Legal);
     setOperationAction(ISD::FTRUNC, MVT::v4f32, Legal);
     setOperationAction(ISD::FROUND, MVT::v4f32, Legal);
 
     setOperationAction(ISD::FNEARBYINT, MVT::v4f64, Expand);
     setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Expand);
 
     // These need to set FE_INEXACT, and so cannot be vectorized here.
     setOperationAction(ISD::FRINT, MVT::v4f64, Expand);
     setOperationAction(ISD::FRINT, MVT::v4f32, Expand);
 
     if (TM.Options.UnsafeFPMath) {
       setOperationAction(ISD::FDIV, MVT::v4f64, Legal);
       setOperationAction(ISD::FSQRT, MVT::v4f64, Legal);
 
       setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
       setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
     } else {
       setOperationAction(ISD::FDIV, MVT::v4f64, Expand);
       setOperationAction(ISD::FSQRT, MVT::v4f64, Expand);
 
       setOperationAction(ISD::FDIV, MVT::v4f32, Expand);
       setOperationAction(ISD::FSQRT, MVT::v4f32, Expand);
     }
   }
 
   if (Subtarget.has64BitSupport())
     setOperationAction(ISD::PREFETCH, MVT::Other, Legal);
 
   setOperationAction(ISD::READCYCLECOUNTER, MVT::i64, isPPC64 ? Legal : Custom);
 
   if (!isPPC64) {
     setOperationAction(ISD::ATOMIC_LOAD,  MVT::i64, Expand);
     setOperationAction(ISD::ATOMIC_STORE, MVT::i64, Expand);
   }
 
   setBooleanContents(ZeroOrOneBooleanContent);
 
   if (Subtarget.hasAltivec()) {
     // Altivec instructions set fields to all zeros or all ones.
     setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
   }
 
   if (!isPPC64) {
     // These libcalls are not available in 32-bit.
     setLibcallName(RTLIB::SHL_I128, nullptr);
     setLibcallName(RTLIB::SRL_I128, nullptr);
     setLibcallName(RTLIB::SRA_I128, nullptr);
   }
 
   setStackPointerRegisterToSaveRestore(isPPC64 ? PPC::X1 : PPC::R1);
 
   // We have target-specific dag combine patterns for the following nodes:
   setTargetDAGCombine(ISD::ADD);
   setTargetDAGCombine(ISD::SHL);
   setTargetDAGCombine(ISD::SRA);
   setTargetDAGCombine(ISD::SRL);
   setTargetDAGCombine(ISD::MUL);
   setTargetDAGCombine(ISD::SINT_TO_FP);
   setTargetDAGCombine(ISD::BUILD_VECTOR);
   if (Subtarget.hasFPCVT())
     setTargetDAGCombine(ISD::UINT_TO_FP);
   setTargetDAGCombine(ISD::LOAD);
   setTargetDAGCombine(ISD::STORE);
   setTargetDAGCombine(ISD::BR_CC);
   if (Subtarget.useCRBits())
     setTargetDAGCombine(ISD::BRCOND);
   setTargetDAGCombine(ISD::BSWAP);
   setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
   setTargetDAGCombine(ISD::INTRINSIC_W_CHAIN);
   setTargetDAGCombine(ISD::INTRINSIC_VOID);
 
   setTargetDAGCombine(ISD::SIGN_EXTEND);
   setTargetDAGCombine(ISD::ZERO_EXTEND);
   setTargetDAGCombine(ISD::ANY_EXTEND);
 
   setTargetDAGCombine(ISD::TRUNCATE);
   setTargetDAGCombine(ISD::VECTOR_SHUFFLE);
 
 
   if (Subtarget.useCRBits()) {
     setTargetDAGCombine(ISD::TRUNCATE);
     setTargetDAGCombine(ISD::SETCC);
     setTargetDAGCombine(ISD::SELECT_CC);
   }
 
   // Use reciprocal estimates.
   if (TM.Options.UnsafeFPMath) {
     setTargetDAGCombine(ISD::FDIV);
     setTargetDAGCombine(ISD::FSQRT);
   }
 
   if (Subtarget.hasP9Altivec()) {
     setTargetDAGCombine(ISD::ABS);
     setTargetDAGCombine(ISD::VSELECT);
   }
 
   // Darwin long double math library functions have $LDBL128 appended.
   if (Subtarget.isDarwin()) {
     setLibcallName(RTLIB::COS_PPCF128, "cosl$LDBL128");
     setLibcallName(RTLIB::POW_PPCF128, "powl$LDBL128");
     setLibcallName(RTLIB::REM_PPCF128, "fmodl$LDBL128");
     setLibcallName(RTLIB::SIN_PPCF128, "sinl$LDBL128");
     setLibcallName(RTLIB::SQRT_PPCF128, "sqrtl$LDBL128");
     setLibcallName(RTLIB::LOG_PPCF128, "logl$LDBL128");
     setLibcallName(RTLIB::LOG2_PPCF128, "log2l$LDBL128");
     setLibcallName(RTLIB::LOG10_PPCF128, "log10l$LDBL128");
     setLibcallName(RTLIB::EXP_PPCF128, "expl$LDBL128");
     setLibcallName(RTLIB::EXP2_PPCF128, "exp2l$LDBL128");
   }
 
   if (EnableQuadPrecision) {
     setLibcallName(RTLIB::LOG_F128, "logf128");
     setLibcallName(RTLIB::LOG2_F128, "log2f128");
     setLibcallName(RTLIB::LOG10_F128, "log10f128");
     setLibcallName(RTLIB::EXP_F128, "expf128");
     setLibcallName(RTLIB::EXP2_F128, "exp2f128");
     setLibcallName(RTLIB::SIN_F128, "sinf128");
     setLibcallName(RTLIB::COS_F128, "cosf128");
     setLibcallName(RTLIB::POW_F128, "powf128");
     setLibcallName(RTLIB::FMIN_F128, "fminf128");
     setLibcallName(RTLIB::FMAX_F128, "fmaxf128");
     setLibcallName(RTLIB::POWI_F128, "__powikf2");
     setLibcallName(RTLIB::REM_F128, "fmodf128");
   }
 
   // With 32 condition bits, we don't need to sink (and duplicate) compares
   // aggressively in CodeGenPrep.
   if (Subtarget.useCRBits()) {
     setHasMultipleConditionRegisters();
     setJumpIsExpensive();
   }
 
   setMinFunctionAlignment(Align(4));
   if (Subtarget.isDarwin())
     setPrefFunctionAlignment(Align(16));
 
   switch (Subtarget.getCPUDirective()) {
   default: break;
   case PPC::DIR_970:
   case PPC::DIR_A2:
   case PPC::DIR_E500:
   case PPC::DIR_E500mc:
   case PPC::DIR_E5500:
   case PPC::DIR_PWR4:
   case PPC::DIR_PWR5:
   case PPC::DIR_PWR5X:
   case PPC::DIR_PWR6:
   case PPC::DIR_PWR6X:
   case PPC::DIR_PWR7:
   case PPC::DIR_PWR8:
   case PPC::DIR_PWR9:
   case PPC::DIR_PWR_FUTURE:
     setPrefLoopAlignment(Align(16));
     setPrefFunctionAlignment(Align(16));
     break;
   }
 
   if (Subtarget.enableMachineScheduler())
     setSchedulingPreference(Sched::Source);
   else
     setSchedulingPreference(Sched::Hybrid);
 
   computeRegisterProperties(STI.getRegisterInfo());
 
   // The Freescale cores do better with aggressive inlining of memcpy and
   // friends. GCC uses same threshold of 128 bytes (= 32 word stores).
   if (Subtarget.getCPUDirective() == PPC::DIR_E500mc ||
       Subtarget.getCPUDirective() == PPC::DIR_E5500) {
     MaxStoresPerMemset = 32;
     MaxStoresPerMemsetOptSize = 16;
     MaxStoresPerMemcpy = 32;
     MaxStoresPerMemcpyOptSize = 8;
     MaxStoresPerMemmove = 32;
     MaxStoresPerMemmoveOptSize = 8;
   } else if (Subtarget.getCPUDirective() == PPC::DIR_A2) {
     // The A2 also benefits from (very) aggressive inlining of memcpy and
     // friends. The overhead of a the function call, even when warm, can be
     // over one hundred cycles.
     MaxStoresPerMemset = 128;
     MaxStoresPerMemcpy = 128;
     MaxStoresPerMemmove = 128;
     MaxLoadsPerMemcmp = 128;
   } else {
     MaxLoadsPerMemcmp = 8;
     MaxLoadsPerMemcmpOptSize = 4;
   }
 }
 
 /// getMaxByValAlign - Helper for getByValTypeAlignment to determine
 /// the desired ByVal argument alignment.
 static void getMaxByValAlign(Type *Ty, unsigned &MaxAlign,
                              unsigned MaxMaxAlign) {
   if (MaxAlign == MaxMaxAlign)
     return;
   if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
     if (MaxMaxAlign >= 32 && VTy->getBitWidth() >= 256)
       MaxAlign = 32;
     else if (VTy->getBitWidth() >= 128 && MaxAlign < 16)
       MaxAlign = 16;
   } else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
     unsigned EltAlign = 0;
     getMaxByValAlign(ATy->getElementType(), EltAlign, MaxMaxAlign);
     if (EltAlign > MaxAlign)
       MaxAlign = EltAlign;
   } else if (StructType *STy = dyn_cast<StructType>(Ty)) {
     for (auto *EltTy : STy->elements()) {
       unsigned EltAlign = 0;
       getMaxByValAlign(EltTy, EltAlign, MaxMaxAlign);
       if (EltAlign > MaxAlign)
         MaxAlign = EltAlign;
       if (MaxAlign == MaxMaxAlign)
         break;
     }
   }
 }
 
 /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
 /// function arguments in the caller parameter area.
 unsigned PPCTargetLowering::getByValTypeAlignment(Type *Ty,
                                                   const DataLayout &DL) const {
   // Darwin passes everything on 4 byte boundary.
   if (Subtarget.isDarwin())
     return 4;
 
   // 16byte and wider vectors are passed on 16byte boundary.
   // The rest is 8 on PPC64 and 4 on PPC32 boundary.
   unsigned Align = Subtarget.isPPC64() ? 8 : 4;
   if (Subtarget.hasAltivec() || Subtarget.hasQPX())
     getMaxByValAlign(Ty, Align, Subtarget.hasQPX() ? 32 : 16);
   return Align;
 }
 
 bool PPCTargetLowering::useSoftFloat() const {
   return Subtarget.useSoftFloat();
 }
 
 bool PPCTargetLowering::hasSPE() const {
   return Subtarget.hasSPE();
 }
 
 bool PPCTargetLowering::preferIncOfAddToSubOfNot(EVT VT) const {
   return VT.isScalarInteger();
 }
 
 const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
   switch ((PPCISD::NodeType)Opcode) {
   case PPCISD::FIRST_NUMBER:    break;
   case PPCISD::FSEL:            return "PPCISD::FSEL";
   case PPCISD::XSMAXCDP:        return "PPCISD::XSMAXCDP";
   case PPCISD::XSMINCDP:        return "PPCISD::XSMINCDP";
   case PPCISD::FCFID:           return "PPCISD::FCFID";
   case PPCISD::FCFIDU:          return "PPCISD::FCFIDU";
   case PPCISD::FCFIDS:          return "PPCISD::FCFIDS";
   case PPCISD::FCFIDUS:         return "PPCISD::FCFIDUS";
   case PPCISD::FCTIDZ:          return "PPCISD::FCTIDZ";
   case PPCISD::FCTIWZ:          return "PPCISD::FCTIWZ";
   case PPCISD::FCTIDUZ:         return "PPCISD::FCTIDUZ";
   case PPCISD::FCTIWUZ:         return "PPCISD::FCTIWUZ";
   case PPCISD::FP_TO_UINT_IN_VSR:
                                 return "PPCISD::FP_TO_UINT_IN_VSR,";
   case PPCISD::FP_TO_SINT_IN_VSR:
                                 return "PPCISD::FP_TO_SINT_IN_VSR";
   case PPCISD::FRE:             return "PPCISD::FRE";
   case PPCISD::FRSQRTE:         return "PPCISD::FRSQRTE";
   case PPCISD::STFIWX:          return "PPCISD::STFIWX";
   case PPCISD::VMADDFP:         return "PPCISD::VMADDFP";
   case PPCISD::VNMSUBFP:        return "PPCISD::VNMSUBFP";
   case PPCISD::VPERM:           return "PPCISD::VPERM";
   case PPCISD::XXSPLT:          return "PPCISD::XXSPLT";
   case PPCISD::VECINSERT:       return "PPCISD::VECINSERT";
   case PPCISD::XXPERMDI:        return "PPCISD::XXPERMDI";
   case PPCISD::VECSHL:          return "PPCISD::VECSHL";
   case PPCISD::CMPB:            return "PPCISD::CMPB";
   case PPCISD::Hi:              return "PPCISD::Hi";
   case PPCISD::Lo:              return "PPCISD::Lo";
   case PPCISD::TOC_ENTRY:       return "PPCISD::TOC_ENTRY";
   case PPCISD::ATOMIC_CMP_SWAP_8: return "PPCISD::ATOMIC_CMP_SWAP_8";
   case PPCISD::ATOMIC_CMP_SWAP_16: return "PPCISD::ATOMIC_CMP_SWAP_16";
   case PPCISD::DYNALLOC:        return "PPCISD::DYNALLOC";
   case PPCISD::DYNAREAOFFSET:   return "PPCISD::DYNAREAOFFSET";
   case PPCISD::GlobalBaseReg:   return "PPCISD::GlobalBaseReg";
   case PPCISD::SRL:             return "PPCISD::SRL";
   case PPCISD::SRA:             return "PPCISD::SRA";
   case PPCISD::SHL:             return "PPCISD::SHL";
   case PPCISD::SRA_ADDZE:       return "PPCISD::SRA_ADDZE";
   case PPCISD::CALL:            return "PPCISD::CALL";
   case PPCISD::CALL_NOP:        return "PPCISD::CALL_NOP";
   case PPCISD::MTCTR:           return "PPCISD::MTCTR";
   case PPCISD::BCTRL:           return "PPCISD::BCTRL";
   case PPCISD::BCTRL_LOAD_TOC:  return "PPCISD::BCTRL_LOAD_TOC";
   case PPCISD::RET_FLAG:        return "PPCISD::RET_FLAG";
   case PPCISD::READ_TIME_BASE:  return "PPCISD::READ_TIME_BASE";
   case PPCISD::EH_SJLJ_SETJMP:  return "PPCISD::EH_SJLJ_SETJMP";
   case PPCISD::EH_SJLJ_LONGJMP: return "PPCISD::EH_SJLJ_LONGJMP";
   case PPCISD::MFOCRF:          return "PPCISD::MFOCRF";
   case PPCISD::MFVSR:           return "PPCISD::MFVSR";
   case PPCISD::MTVSRA:          return "PPCISD::MTVSRA";
   case PPCISD::MTVSRZ:          return "PPCISD::MTVSRZ";
   case PPCISD::SINT_VEC_TO_FP:  return "PPCISD::SINT_VEC_TO_FP";
   case PPCISD::UINT_VEC_TO_FP:  return "PPCISD::UINT_VEC_TO_FP";
   case PPCISD::ANDI_rec_1_EQ_BIT:
     return "PPCISD::ANDI_rec_1_EQ_BIT";
   case PPCISD::ANDI_rec_1_GT_BIT:
     return "PPCISD::ANDI_rec_1_GT_BIT";
   case PPCISD::VCMP:            return "PPCISD::VCMP";
   case PPCISD::VCMPo:           return "PPCISD::VCMPo";
   case PPCISD::LBRX:            return "PPCISD::LBRX";
   case PPCISD::STBRX:           return "PPCISD::STBRX";
   case PPCISD::LFIWAX:          return "PPCISD::LFIWAX";
   case PPCISD::LFIWZX:          return "PPCISD::LFIWZX";
   case PPCISD::LXSIZX:          return "PPCISD::LXSIZX";
   case PPCISD::STXSIX:          return "PPCISD::STXSIX";
   case PPCISD::VEXTS:           return "PPCISD::VEXTS";
   case PPCISD::SExtVElems:      return "PPCISD::SExtVElems";
   case PPCISD::LXVD2X:          return "PPCISD::LXVD2X";
   case PPCISD::STXVD2X:         return "PPCISD::STXVD2X";
   case PPCISD::LOAD_VEC_BE:     return "PPCISD::LOAD_VEC_BE";
   case PPCISD::STORE_VEC_BE:    return "PPCISD::STORE_VEC_BE";
   case PPCISD::ST_VSR_SCAL_INT:
                                 return "PPCISD::ST_VSR_SCAL_INT";
   case PPCISD::COND_BRANCH:     return "PPCISD::COND_BRANCH";
   case PPCISD::BDNZ:            return "PPCISD::BDNZ";
   case PPCISD::BDZ:             return "PPCISD::BDZ";
   case PPCISD::MFFS:            return "PPCISD::MFFS";
   case PPCISD::FADDRTZ:         return "PPCISD::FADDRTZ";
   case PPCISD::TC_RETURN:       return "PPCISD::TC_RETURN";
   case PPCISD::CR6SET:          return "PPCISD::CR6SET";
   case PPCISD::CR6UNSET:        return "PPCISD::CR6UNSET";
   case PPCISD::PPC32_GOT:       return "PPCISD::PPC32_GOT";
   case PPCISD::PPC32_PICGOT:    return "PPCISD::PPC32_PICGOT";
   case PPCISD::ADDIS_GOT_TPREL_HA: return "PPCISD::ADDIS_GOT_TPREL_HA";
   case PPCISD::LD_GOT_TPREL_L:  return "PPCISD::LD_GOT_TPREL_L";
   case PPCISD::ADD_TLS:         return "PPCISD::ADD_TLS";
   case PPCISD::ADDIS_TLSGD_HA:  return "PPCISD::ADDIS_TLSGD_HA";
   case PPCISD::ADDI_TLSGD_L:    return "PPCISD::ADDI_TLSGD_L";
   case PPCISD::GET_TLS_ADDR:    return "PPCISD::GET_TLS_ADDR";
   case PPCISD::ADDI_TLSGD_L_ADDR: return "PPCISD::ADDI_TLSGD_L_ADDR";
   case PPCISD::ADDIS_TLSLD_HA:  return "PPCISD::ADDIS_TLSLD_HA";
   case PPCISD::ADDI_TLSLD_L:    return "PPCISD::ADDI_TLSLD_L";
   case PPCISD::GET_TLSLD_ADDR:  return "PPCISD::GET_TLSLD_ADDR";
   case PPCISD::ADDI_TLSLD_L_ADDR: return "PPCISD::ADDI_TLSLD_L_ADDR";
   case PPCISD::ADDIS_DTPREL_HA: return "PPCISD::ADDIS_DTPREL_HA";
   case PPCISD::ADDI_DTPREL_L:   return "PPCISD::ADDI_DTPREL_L";
   case PPCISD::VADD_SPLAT:      return "PPCISD::VADD_SPLAT";
   case PPCISD::SC:              return "PPCISD::SC";
   case PPCISD::CLRBHRB:         return "PPCISD::CLRBHRB";
   case PPCISD::MFBHRBE:         return "PPCISD::MFBHRBE";
   case PPCISD::RFEBB:           return "PPCISD::RFEBB";
   case PPCISD::XXSWAPD:         return "PPCISD::XXSWAPD";
   case PPCISD::SWAP_NO_CHAIN:   return "PPCISD::SWAP_NO_CHAIN";
   case PPCISD::VABSD:           return "PPCISD::VABSD";
   case PPCISD::QVFPERM:         return "PPCISD::QVFPERM";
   case PPCISD::QVGPCI:          return "PPCISD::QVGPCI";
   case PPCISD::QVALIGNI:        return "PPCISD::QVALIGNI";
   case PPCISD::QVESPLATI:       return "PPCISD::QVESPLATI";
   case PPCISD::QBFLT:           return "PPCISD::QBFLT";
   case PPCISD::QVLFSb:          return "PPCISD::QVLFSb";
   case PPCISD::BUILD_FP128:     return "PPCISD::BUILD_FP128";
   case PPCISD::BUILD_SPE64:     return "PPCISD::BUILD_SPE64";
   case PPCISD::EXTRACT_SPE:     return "PPCISD::EXTRACT_SPE";
   case PPCISD::EXTSWSLI:        return "PPCISD::EXTSWSLI";
   case PPCISD::LD_VSX_LH:       return "PPCISD::LD_VSX_LH";
   case PPCISD::FP_EXTEND_HALF:  return "PPCISD::FP_EXTEND_HALF";
   case PPCISD::LD_SPLAT:        return "PPCISD::LD_SPLAT";
   }
   return nullptr;
 }
 
 EVT PPCTargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &C,
                                           EVT VT) const {
   if (!VT.isVector())
     return Subtarget.useCRBits() ? MVT::i1 : MVT::i32;
 
   if (Subtarget.hasQPX())
     return EVT::getVectorVT(C, MVT::i1, VT.getVectorNumElements());
 
   return VT.changeVectorElementTypeToInteger();
 }
 
 bool PPCTargetLowering::enableAggressiveFMAFusion(EVT VT) const {
   assert(VT.isFloatingPoint() && "Non-floating-point FMA?");
   return true;
 }
 
 //===----------------------------------------------------------------------===//
 // Node matching predicates, for use by the tblgen matching code.
 //===----------------------------------------------------------------------===//
 
 /// isFloatingPointZero - Return true if this is 0.0 or -0.0.
 static bool isFloatingPointZero(SDValue Op) {
   if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
     return CFP->getValueAPF().isZero();
   else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
     // Maybe this has already been legalized into the constant pool?
     if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
       if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
         return CFP->getValueAPF().isZero();
   }
   return false;
 }
 
 /// isConstantOrUndef - Op is either an undef node or a ConstantSDNode.  Return
 /// true if Op is undef or if it matches the specified value.
 static bool isConstantOrUndef(int Op, int Val) {
   return Op < 0 || Op == Val;
 }
 
 /// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
 /// VPKUHUM instruction.
 /// The ShuffleKind distinguishes between big-endian operations with
 /// two different inputs (0), either-endian operations with two identical
 /// inputs (1), and little-endian operations with two different inputs (2).
 /// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
 bool PPC::isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                                SelectionDAG &DAG) {
   bool IsLE = DAG.getDataLayout().isLittleEndian();
   if (ShuffleKind == 0) {
     if (IsLE)
       return false;
     for (unsigned i = 0; i != 16; ++i)
       if (!isConstantOrUndef(N->getMaskElt(i), i*2+1))
         return false;
   } else if (ShuffleKind == 2) {
     if (!IsLE)
       return false;
     for (unsigned i = 0; i != 16; ++i)
       if (!isConstantOrUndef(N->getMaskElt(i), i*2))
         return false;
   } else if (ShuffleKind == 1) {
     unsigned j = IsLE ? 0 : 1;
     for (unsigned i = 0; i != 8; ++i)
       if (!isConstantOrUndef(N->getMaskElt(i),    i*2+j) ||
           !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j))
         return false;
   }
   return true;
 }
 
 /// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
 /// VPKUWUM instruction.
 /// The ShuffleKind distinguishes between big-endian operations with
 /// two different inputs (0), either-endian operations with two identical
 /// inputs (1), and little-endian operations with two different inputs (2).
 /// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
 bool PPC::isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                                SelectionDAG &DAG) {
   bool IsLE = DAG.getDataLayout().isLittleEndian();
   if (ShuffleKind == 0) {
     if (IsLE)
       return false;
     for (unsigned i = 0; i != 16; i += 2)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+2) ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+3))
         return false;
   } else if (ShuffleKind == 2) {
     if (!IsLE)
       return false;
     for (unsigned i = 0; i != 16; i += 2)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2) ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+1))
         return false;
   } else if (ShuffleKind == 1) {
     unsigned j = IsLE ? 0 : 2;
     for (unsigned i = 0; i != 8; i += 2)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+j)   ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+j+1) ||
           !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j)   ||
           !isConstantOrUndef(N->getMaskElt(i+9),  i*2+j+1))
         return false;
   }
   return true;
 }
 
 /// isVPKUDUMShuffleMask - Return true if this is the shuffle mask for a
 /// VPKUDUM instruction, AND the VPKUDUM instruction exists for the
 /// current subtarget.
 ///
 /// The ShuffleKind distinguishes between big-endian operations with
 /// two different inputs (0), either-endian operations with two identical
 /// inputs (1), and little-endian operations with two different inputs (2).
 /// For the latter, the input operands are swapped (see PPCInstrAltivec.td).
 bool PPC::isVPKUDUMShuffleMask(ShuffleVectorSDNode *N, unsigned ShuffleKind,
                                SelectionDAG &DAG) {
   const PPCSubtarget& Subtarget =
       static_cast<const PPCSubtarget&>(DAG.getSubtarget());
   if (!Subtarget.hasP8Vector())
     return false;
 
   bool IsLE = DAG.getDataLayout().isLittleEndian();
   if (ShuffleKind == 0) {
     if (IsLE)
       return false;
     for (unsigned i = 0; i != 16; i += 4)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+4) ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+5) ||
           !isConstantOrUndef(N->getMaskElt(i+2),  i*2+6) ||
           !isConstantOrUndef(N->getMaskElt(i+3),  i*2+7))
         return false;
   } else if (ShuffleKind == 2) {
     if (!IsLE)
       return false;
     for (unsigned i = 0; i != 16; i += 4)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2) ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+1) ||
           !isConstantOrUndef(N->getMaskElt(i+2),  i*2+2) ||
           !isConstantOrUndef(N->getMaskElt(i+3),  i*2+3))
         return false;
   } else if (ShuffleKind == 1) {
     unsigned j = IsLE ? 0 : 4;
     for (unsigned i = 0; i != 8; i += 4)
       if (!isConstantOrUndef(N->getMaskElt(i  ),  i*2+j)   ||
           !isConstantOrUndef(N->getMaskElt(i+1),  i*2+j+1) ||
           !isConstantOrUndef(N->getMaskElt(i+2),  i*2+j+2) ||
           !isConstantOrUndef(N->getMaskElt(i+3),  i*2+j+3) ||
           !isConstantOrUndef(N->getMaskElt(i+8),  i*2+j)   ||
           !isConstantOrUndef(N->getMaskElt(i+9),  i*2+j+1) ||
           !isConstantOrUndef(N->getMaskElt(i+10), i*2+j+2) ||
           !isConstantOrUndef(N->getMaskElt(i+11), i*2+j+3))
         return false;
   }
   return true;
 }
 
 /// isVMerge - Common function, used to match vmrg* shuffles.
 ///
 static bool isVMerge(ShuffleVectorSDNode *N, unsigned UnitSize,
                      unsigned LHSStart, unsigned RHSStart) {
   if (N->getValueType(0) != MVT::v16i8)
     return false;
   assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
          "Unsupported merge size!");
 
   for (unsigned i = 0; i != 8/UnitSize; ++i)     // Step over units
     for (unsigned j = 0; j != UnitSize; ++j) {   // Step over bytes within unit
       if (!isConstantOrUndef(N->getMaskElt(i*UnitSize*2+j),
                              LHSStart+j+i*UnitSize) ||
           !isConstantOrUndef(N->getMaskElt(i*UnitSize*2+UnitSize+j),
                              RHSStart+j+i*UnitSize))
         return false;
     }
   return true;
 }
 
 /// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
 /// a VMRGL* instruction with the specified unit size (1,2 or 4 bytes).
 /// The ShuffleKind distinguishes between big-endian merges with two
 /// different inputs (0), either-endian merges with two identical inputs (1),
 /// and little-endian merges with two different inputs (2).  For the latter,
 /// the input operands are swapped (see PPCInstrAltivec.td).
 bool PPC::isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
                              unsigned ShuffleKind, SelectionDAG &DAG) {
   if (DAG.getDataLayout().isLittleEndian()) {
     if (ShuffleKind == 1) // unary
       return isVMerge(N, UnitSize, 0, 0);
     else if (ShuffleKind == 2) // swapped
       return isVMerge(N, UnitSize, 0, 16);
     else
       return false;
   } else {
     if (ShuffleKind == 1) // unary
       return isVMerge(N, UnitSize, 8, 8);
     else if (ShuffleKind == 0) // normal
       return isVMerge(N, UnitSize, 8, 24);
     else
       return false;
   }
 }
 
 /// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
 /// a VMRGH* instruction with the specified unit size (1,2 or 4 bytes).
 /// The ShuffleKind distinguishes between big-endian merges with two
 /// different inputs (0), either-endian merges with two identical inputs (1),
 /// and little-endian merges with two different inputs (2).  For the latter,
 /// the input operands are swapped (see PPCInstrAltivec.td).
 bool PPC::isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
                              unsigned ShuffleKind, SelectionDAG &DAG) {
   if (DAG.getDataLayout().isLittleEndian()) {
     if (ShuffleKind == 1) // unary
       return isVMerge(N, UnitSize, 8, 8);
     else if (ShuffleKind == 2) // swapped
       return isVMerge(N, UnitSize, 8, 24);
     else
       return false;
   } else {
     if (ShuffleKind == 1) // unary
       return isVMerge(N, UnitSize, 0, 0);
     else if (ShuffleKind == 0) // normal
       return isVMerge(N, UnitSize, 0, 16);
     else
       return false;
   }
 }
 
 /**
  * Common function used to match vmrgew and vmrgow shuffles
  *
  * The indexOffset determines whether to look for even or odd words in
  * the shuffle mask. This is based on the of the endianness of the target
  * machine.
  *   - Little Endian:
  *     - Use offset of 0 to check for odd elements
  *     - Use offset of 4 to check for even elements
  *   - Big Endian:
  *     - Use offset of 0 to check for even elements
  *     - Use offset of 4 to check for odd elements
  * A detailed description of the vector element ordering for little endian and
  * big endian can be found at
  * http://www.ibm.com/developerworks/library/l-ibm-xl-c-cpp-compiler/index.html
  * Targeting your applications - what little endian and big endian IBM XL C/C++
  * compiler differences mean to you
  *
  * The mask to the shuffle vector instruction specifies the indices of the
  * elements from the two input vectors to place in the result. The elements are
  * numbered in array-access order, starting with the first vector. These vectors
  * are always of type v16i8, thus each vector will contain 16 elements of size
  * 8. More info on the shuffle vector can be found in the
  * http://llvm.org/docs/LangRef.html#shufflevector-instruction
  * Language Reference.
  *
  * The RHSStartValue indicates whether the same input vectors are used (unary)
  * or two different input vectors are used, based on the following:
  *   - If the instruction uses the same vector for both inputs, the range of the
  *     indices will be 0 to 15. In this case, the RHSStart value passed should
  *     be 0.
  *   - If the instruction has two different vectors then the range of the
  *     indices will be 0 to 31. In this case, the RHSStart value passed should
  *     be 16 (indices 0-15 specify elements in the first vector while indices 16
  *     to 31 specify elements in the second vector).
  *
  * \param[in] N The shuffle vector SD Node to analyze
  * \param[in] IndexOffset Specifies whether to look for even or odd elements
  * \param[in] RHSStartValue Specifies the starting index for the righthand input
  * vector to the shuffle_vector instruction
  * \return true iff this shuffle vector represents an even or odd word merge
  */
 static bool isVMerge(ShuffleVectorSDNode *N, unsigned IndexOffset,
                      unsigned RHSStartValue) {
   if (N->getValueType(0) != MVT::v16i8)
     return false;
 
   for (unsigned i = 0; i < 2; ++i)
     for (unsigned j = 0; j < 4; ++j)
       if (!isConstantOrUndef(N->getMaskElt(i*4+j),
                              i*RHSStartValue+j+IndexOffset) ||
           !isConstantOrUndef(N->getMaskElt(i*4+j+8),
                              i*RHSStartValue+j+IndexOffset+8))
         return false;
   return true;
 }
 
 /**
  * Determine if the specified shuffle mask is suitable for the vmrgew or
  * vmrgow instructions.
  *
  * \param[in] N The shuffle vector SD Node to analyze
  * \param[in] CheckEven Check for an even merge (true) or an odd merge (false)
  * \param[in] ShuffleKind Identify the type of merge:
  *   - 0 = big-endian merge with two different inputs;
  *   - 1 = either-endian merge with two identical inputs;
  *   - 2 = little-endian merge with two different inputs (inputs are swapped for
  *     little-endian merges).
  * \param[in] DAG The current SelectionDAG
  * \return true iff this shuffle mask
  */
 bool PPC::isVMRGEOShuffleMask(ShuffleVectorSDNode *N, bool CheckEven,
                               unsigned ShuffleKind, SelectionDAG &DAG) {
   if (DAG.getDataLayout().isLittleEndian()) {
     unsigned indexOffset = CheckEven ? 4 : 0;
     if (ShuffleKind == 1) // Unary
       return isVMerge(N, indexOffset, 0);
     else if (ShuffleKind == 2) // swapped
       return isVMerge(N, indexOffset, 16);
     else
       return false;
   }
   else {
     unsigned indexOffset = CheckEven ? 0 : 4;
     if (ShuffleKind == 1) // Unary
       return isVMerge(N, indexOffset, 0);
     else if (ShuffleKind == 0) // Normal
       return isVMerge(N, indexOffset, 16);
     else
       return false;
   }
   return false;
 }
 
 /// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
 /// amount, otherwise return -1.
 /// The ShuffleKind distinguishes between big-endian operations with two
 /// different inputs (0), either-endian operations with two identical inputs
 /// (1), and little-endian operations with two different inputs (2).  For the
 /// latter, the input operands are swapped (see PPCInstrAltivec.td).
 int PPC::isVSLDOIShuffleMask(SDNode *N, unsigned ShuffleKind,
                              SelectionDAG &DAG) {
   if (N->getValueType(0) != MVT::v16i8)
     return -1;
 
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
 
   // Find the first non-undef value in the shuffle mask.
   unsigned i;
   for (i = 0; i != 16 && SVOp->getMaskElt(i) < 0; ++i)
     /*search*/;
 
   if (i == 16) return -1;  // all undef.
 
   // Otherwise, check to see if the rest of the elements are consecutively
   // numbered from this value.
   unsigned ShiftAmt = SVOp->getMaskElt(i);
   if (ShiftAmt < i) return -1;
 
   ShiftAmt -= i;
   bool isLE = DAG.getDataLayout().isLittleEndian();
 
   if ((ShuffleKind == 0 && !isLE) || (ShuffleKind == 2 && isLE)) {
     // Check the rest of the elements to see if they are consecutive.
     for (++i; i != 16; ++i)
       if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
         return -1;
   } else if (ShuffleKind == 1) {
     // Check the rest of the elements to see if they are consecutive.
     for (++i; i != 16; ++i)
       if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
         return -1;
   } else
     return -1;
 
   if (isLE)
     ShiftAmt = 16 - ShiftAmt;
 
   return ShiftAmt;
 }
 
 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
 /// specifies a splat of a single element that is suitable for input to
 /// one of the splat operations (VSPLTB/VSPLTH/VSPLTW/XXSPLTW/LXVDSX/etc.).
 bool PPC::isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize) {
   assert(N->getValueType(0) == MVT::v16i8 && isPowerOf2_32(EltSize) &&
          EltSize <= 8 && "Can only handle 1,2,4,8 byte element sizes");
 
   // The consecutive indices need to specify an element, not part of two
   // different elements.  So abandon ship early if this isn't the case.
   if (N->getMaskElt(0) % EltSize != 0)
     return false;
 
   // This is a splat operation if each element of the permute is the same, and
   // if the value doesn't reference the second vector.
   unsigned ElementBase = N->getMaskElt(0);
 
   // FIXME: Handle UNDEF elements too!
   if (ElementBase >= 16)
     return false;
 
   // Check that the indices are consecutive, in the case of a multi-byte element
   // splatted with a v16i8 mask.
   for (unsigned i = 1; i != EltSize; ++i)
     if (N->getMaskElt(i) < 0 || N->getMaskElt(i) != (int)(i+ElementBase))
       return false;
 
   for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
     if (N->getMaskElt(i) < 0) continue;
     for (unsigned j = 0; j != EltSize; ++j)
       if (N->getMaskElt(i+j) != N->getMaskElt(j))
         return false;
   }
   return true;
 }
 
 /// Check that the mask is shuffling N byte elements. Within each N byte
 /// element of the mask, the indices could be either in increasing or
 /// decreasing order as long as they are consecutive.
 /// \param[in] N the shuffle vector SD Node to analyze
 /// \param[in] Width the element width in bytes, could be 2/4/8/16 (HalfWord/
 /// Word/DoubleWord/QuadWord).
 /// \param[in] StepLen the delta indices number among the N byte element, if
 /// the mask is in increasing/decreasing order then it is 1/-1.
 /// \return true iff the mask is shuffling N byte elements.
 static bool isNByteElemShuffleMask(ShuffleVectorSDNode *N, unsigned Width,
                                    int StepLen) {
   assert((Width == 2 || Width == 4 || Width == 8 || Width == 16) &&
          "Unexpected element width.");
   assert((StepLen == 1 || StepLen == -1) && "Unexpected element width.");
 
   unsigned NumOfElem = 16 / Width;
   unsigned MaskVal[16]; //  Width is never greater than 16
   for (unsigned i = 0; i < NumOfElem; ++i) {
     MaskVal[0] = N->getMaskElt(i * Width);
     if ((StepLen == 1) && (MaskVal[0] % Width)) {
       return false;
     } else if ((StepLen == -1) && ((MaskVal[0] + 1) % Width)) {
       return false;
     }
 
     for (unsigned int j = 1; j < Width; ++j) {
       MaskVal[j] = N->getMaskElt(i * Width + j);
       if (MaskVal[j] != MaskVal[j-1] + StepLen) {
         return false;
       }
     }
   }
 
   return true;
 }
 
 bool PPC::isXXINSERTWMask(ShuffleVectorSDNode *N, unsigned &ShiftElts,
                           unsigned &InsertAtByte, bool &Swap, bool IsLE) {
   if (!isNByteElemShuffleMask(N, 4, 1))
     return false;
 
   // Now we look at mask elements 0,4,8,12
   unsigned M0 = N->getMaskElt(0) / 4;
   unsigned M1 = N->getMaskElt(4) / 4;
   unsigned M2 = N->getMaskElt(8) / 4;
   unsigned M3 = N->getMaskElt(12) / 4;
   unsigned LittleEndianShifts[] = { 2, 1, 0, 3 };
   unsigned BigEndianShifts[] = { 3, 0, 1, 2 };
 
   // Below, let H and L be arbitrary elements of the shuffle mask
   // where H is in the range [4,7] and L is in the range [0,3].
   // H, 1, 2, 3 or L, 5, 6, 7
   if ((M0 > 3 && M1 == 1 && M2 == 2 && M3 == 3) ||
       (M0 < 4 && M1 == 5 && M2 == 6 && M3 == 7)) {
     ShiftElts = IsLE ? LittleEndianShifts[M0 & 0x3] : BigEndianShifts[M0 & 0x3];
     InsertAtByte = IsLE ? 12 : 0;
     Swap = M0 < 4;
     return true;
   }
   // 0, H, 2, 3 or 4, L, 6, 7
   if ((M1 > 3 && M0 == 0 && M2 == 2 && M3 == 3) ||
       (M1 < 4 && M0 == 4 && M2 == 6 && M3 == 7)) {
     ShiftElts = IsLE ? LittleEndianShifts[M1 & 0x3] : BigEndianShifts[M1 & 0x3];
     InsertAtByte = IsLE ? 8 : 4;
     Swap = M1 < 4;
     return true;
   }
   // 0, 1, H, 3 or 4, 5, L, 7
   if ((M2 > 3 && M0 == 0 && M1 == 1 && M3 == 3) ||
       (M2 < 4 && M0 == 4 && M1 == 5 && M3 == 7)) {
     ShiftElts = IsLE ? LittleEndianShifts[M2 & 0x3] : BigEndianShifts[M2 & 0x3];
     InsertAtByte = IsLE ? 4 : 8;
     Swap = M2 < 4;
     return true;
   }
   // 0, 1, 2, H or 4, 5, 6, L
   if ((M3 > 3 && M0 == 0 && M1 == 1 && M2 == 2) ||
       (M3 < 4 && M0 == 4 && M1 == 5 && M2 == 6)) {
     ShiftElts = IsLE ? LittleEndianShifts[M3 & 0x3] : BigEndianShifts[M3 & 0x3];
     InsertAtByte = IsLE ? 0 : 12;
     Swap = M3 < 4;
     return true;
   }
 
   // If both vector operands for the shuffle are the same vector, the mask will
   // contain only elements from the first one and the second one will be undef.
   if (N->getOperand(1).isUndef()) {
     ShiftElts = 0;
     Swap = true;
     unsigned XXINSERTWSrcElem = IsLE ? 2 : 1;
     if (M0 == XXINSERTWSrcElem && M1 == 1 && M2 == 2 && M3 == 3) {
       InsertAtByte = IsLE ? 12 : 0;
       return true;
     }
     if (M0 == 0 && M1 == XXINSERTWSrcElem && M2 == 2 && M3 == 3) {
       InsertAtByte = IsLE ? 8 : 4;
       return true;
     }
     if (M0 == 0 && M1 == 1 && M2 == XXINSERTWSrcElem && M3 == 3) {
       InsertAtByte = IsLE ? 4 : 8;
       return true;
     }
     if (M0 == 0 && M1 == 1 && M2 == 2 && M3 == XXINSERTWSrcElem) {
       InsertAtByte = IsLE ? 0 : 12;
       return true;
     }
   }
 
   return false;
 }
 
 bool PPC::isXXSLDWIShuffleMask(ShuffleVectorSDNode *N, unsigned &ShiftElts,
                                bool &Swap, bool IsLE) {
   assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
   // Ensure each byte index of the word is consecutive.
   if (!isNByteElemShuffleMask(N, 4, 1))
     return false;
 
   // Now we look at mask elements 0,4,8,12, which are the beginning of words.
   unsigned M0 = N->getMaskElt(0) / 4;
   unsigned M1 = N->getMaskElt(4) / 4;
   unsigned M2 = N->getMaskElt(8) / 4;
   unsigned M3 = N->getMaskElt(12) / 4;
 
   // If both vector operands for the shuffle are the same vector, the mask will
   // contain only elements from the first one and the second one will be undef.
   if (N->getOperand(1).isUndef()) {
     assert(M0 < 4 && "Indexing into an undef vector?");
     if (M1 != (M0 + 1) % 4 || M2 != (M1 + 1) % 4 || M3 != (M2 + 1) % 4)
       return false;
 
     ShiftElts = IsLE ? (4 - M0) % 4 : M0;
     Swap = false;
     return true;
   }
 
   // Ensure each word index of the ShuffleVector Mask is consecutive.
   if (M1 != (M0 + 1) % 8 || M2 != (M1 + 1) % 8 || M3 != (M2 + 1) % 8)
     return false;
 
   if (IsLE) {
     if (M0 == 0 || M0 == 7 || M0 == 6 || M0 == 5) {
       // Input vectors don't need to be swapped if the leading element
       // of the result is one of the 3 left elements of the second vector
       // (or if there is no shift to be done at all).
       Swap = false;
       ShiftElts = (8 - M0) % 8;
     } else if (M0 == 4 || M0 == 3 || M0 == 2 || M0 == 1) {
       // Input vectors need to be swapped if the leading element
       // of the result is one of the 3 left elements of the first vector
       // (or if we're shifting by 4 - thereby simply swapping the vectors).
       Swap = true;
       ShiftElts = (4 - M0) % 4;
     }
 
     return true;
   } else {                                          // BE
     if (M0 == 0 || M0 == 1 || M0 == 2 || M0 == 3) {
       // Input vectors don't need to be swapped if the leading element
       // of the result is one of the 4 elements of the first vector.
       Swap = false;
       ShiftElts = M0;
     } else if (M0 == 4 || M0 == 5 || M0 == 6 || M0 == 7) {
       // Input vectors need to be swapped if the leading element
       // of the result is one of the 4 elements of the right vector.
       Swap = true;
       ShiftElts = M0 - 4;
     }
 
     return true;
   }
 }
 
 bool static isXXBRShuffleMaskHelper(ShuffleVectorSDNode *N, int Width) {
   assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
 
   if (!isNByteElemShuffleMask(N, Width, -1))
     return false;
 
   for (int i = 0; i < 16; i += Width)
     if (N->getMaskElt(i) != i + Width - 1)
       return false;
 
   return true;
 }
 
 bool PPC::isXXBRHShuffleMask(ShuffleVectorSDNode *N) {
   return isXXBRShuffleMaskHelper(N, 2);
 }
 
 bool PPC::isXXBRWShuffleMask(ShuffleVectorSDNode *N) {
   return isXXBRShuffleMaskHelper(N, 4);
 }
 
 bool PPC::isXXBRDShuffleMask(ShuffleVectorSDNode *N) {
   return isXXBRShuffleMaskHelper(N, 8);
 }
 
 bool PPC::isXXBRQShuffleMask(ShuffleVectorSDNode *N) {
   return isXXBRShuffleMaskHelper(N, 16);
 }
 
 /// Can node \p N be lowered to an XXPERMDI instruction? If so, set \p Swap
 /// if the inputs to the instruction should be swapped and set \p DM to the
 /// value for the immediate.
 /// Specifically, set \p Swap to true only if \p N can be lowered to XXPERMDI
 /// AND element 0 of the result comes from the first input (LE) or second input
 /// (BE). Set \p DM to the calculated result (0-3) only if \p N can be lowered.
 /// \return true iff the given mask of shuffle node \p N is a XXPERMDI shuffle
 /// mask.
 bool PPC::isXXPERMDIShuffleMask(ShuffleVectorSDNode *N, unsigned &DM,
                                bool &Swap, bool IsLE) {
   assert(N->getValueType(0) == MVT::v16i8 && "Shuffle vector expects v16i8");
 
   // Ensure each byte index of the double word is consecutive.
   if (!isNByteElemShuffleMask(N, 8, 1))
     return false;
 
   unsigned M0 = N->getMaskElt(0) / 8;
   unsigned M1 = N->getMaskElt(8) / 8;
   assert(((M0 | M1) < 4) && "A mask element out of bounds?");
 
   // If both vector operands for the shuffle are the same vector, the mask will
   // contain only elements from the first one and the second one will be undef.
   if (N->getOperand(1).isUndef()) {
     if ((M0 | M1) < 2) {
       DM = IsLE ? (((~M1) & 1) << 1) + ((~M0) & 1) : (M0 << 1) + (M1 & 1);
       Swap = false;
       return true;
     } else
       return false;
   }
 
   if (IsLE) {
     if (M0 > 1 && M1 < 2) {
       Swap = false;
     } else if (M0 < 2 && M1 > 1) {
       M0 = (M0 + 2) % 4;
       M1 = (M1 + 2) % 4;
       Swap = true;
     } else
       return false;
 
     // Note: if control flow comes here that means Swap is already set above
     DM = (((~M1) & 1) << 1) + ((~M0) & 1);
     return true;
   } else { // BE
     if (M0 < 2 && M1 > 1) {
       Swap = false;
     } else if (M0 > 1 && M1 < 2) {
       M0 = (M0 + 2) % 4;
       M1 = (M1 + 2) % 4;
       Swap = true;
     } else
       return false;
 
     // Note: if control flow comes here that means Swap is already set above
     DM = (M0 << 1) + (M1 & 1);
     return true;
   }
 }
 
 
 /// getSplatIdxForPPCMnemonics - Return the splat index as a value that is
 /// appropriate for PPC mnemonics (which have a big endian bias - namely
 /// elements are counted from the left of the vector register).
 unsigned PPC::getSplatIdxForPPCMnemonics(SDNode *N, unsigned EltSize,
                                          SelectionDAG &DAG) {
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
   assert(isSplatShuffleMask(SVOp, EltSize));
   if (DAG.getDataLayout().isLittleEndian())
     return (16 / EltSize) - 1 - (SVOp->getMaskElt(0) / EltSize);
   else
     return SVOp->getMaskElt(0) / EltSize;
 }
 
 /// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
 /// by using a vspltis[bhw] instruction of the specified element size, return
 /// the constant being splatted.  The ByteSize field indicates the number of
 /// bytes of each element [124] -> [bhw].
 SDValue PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
   SDValue OpVal(nullptr, 0);
 
   // If ByteSize of the splat is bigger than the element size of the
   // build_vector, then we have a case where we are checking for a splat where
   // multiple elements of the buildvector are folded together into a single
   // logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
   unsigned EltSize = 16/N->getNumOperands();
   if (EltSize < ByteSize) {
     unsigned Multiple = ByteSize/EltSize;   // Number of BV entries per spltval.
     SDValue UniquedVals[4];
     assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
 
     // See if all of the elements in the buildvector agree across.
     for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
       if (N->getOperand(i).isUndef()) continue;
       // If the element isn't a constant, bail fully out.
       if (!isa<ConstantSDNode>(N->getOperand(i))) return SDValue();
 
       if (!UniquedVals[i&(Multiple-1)].getNode())
         UniquedVals[i&(Multiple-1)] = N->getOperand(i);
       else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
         return SDValue();  // no match.
     }
 
     // Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
     // either constant or undef values that are identical for each chunk.  See
     // if these chunks can form into a larger vspltis*.
 
     // Check to see if all of the leading entries are either 0 or -1.  If
     // neither, then this won't fit into the immediate field.
     bool LeadingZero = true;
     bool LeadingOnes = true;
     for (unsigned i = 0; i != Multiple-1; ++i) {
       if (!UniquedVals[i].getNode()) continue;  // Must have been undefs.
 
       LeadingZero &= isNullConstant(UniquedVals[i]);
       LeadingOnes &= isAllOnesConstant(UniquedVals[i]);
     }
     // Finally, check the least significant entry.
     if (LeadingZero) {
       if (!UniquedVals[Multiple-1].getNode())
         return DAG.getTargetConstant(0, SDLoc(N), MVT::i32);  // 0,0,0,undef
       int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getZExtValue();
       if (Val < 16)                                   // 0,0,0,4 -> vspltisw(4)
         return DAG.getTargetConstant(Val, SDLoc(N), MVT::i32);
     }
     if (LeadingOnes) {
       if (!UniquedVals[Multiple-1].getNode())
         return DAG.getTargetConstant(~0U, SDLoc(N), MVT::i32); // -1,-1,-1,undef
       int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSExtValue();
       if (Val >= -16)                            // -1,-1,-1,-2 -> vspltisw(-2)
         return DAG.getTargetConstant(Val, SDLoc(N), MVT::i32);
     }
 
     return SDValue();
   }
 
   // Check to see if this buildvec has a single non-undef value in its elements.
   for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
     if (N->getOperand(i).isUndef()) continue;
     if (!OpVal.getNode())
       OpVal = N->getOperand(i);
     else if (OpVal != N->getOperand(i))
       return SDValue();
   }
 
   if (!OpVal.getNode()) return SDValue();  // All UNDEF: use implicit def.
 
   unsigned ValSizeInBytes = EltSize;
   uint64_t Value = 0;
   if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
     Value = CN->getZExtValue();
   } else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
     assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
     Value = FloatToBits(CN->getValueAPF().convertToFloat());
   }
 
   // If the splat value is larger than the element value, then we can never do
   // this splat.  The only case that we could fit the replicated bits into our
   // immediate field for would be zero, and we prefer to use vxor for it.
   if (ValSizeInBytes < ByteSize) return SDValue();
 
   // If the element value is larger than the splat value, check if it consists
   // of a repeated bit pattern of size ByteSize.
   if (!APInt(ValSizeInBytes * 8, Value).isSplat(ByteSize * 8))
     return SDValue();
 
   // Properly sign extend the value.
   int MaskVal = SignExtend32(Value, ByteSize * 8);
 
   // If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
   if (MaskVal == 0) return SDValue();
 
   // Finally, if this value fits in a 5 bit sext field, return it
   if (SignExtend32<5>(MaskVal) == MaskVal)
     return DAG.getTargetConstant(MaskVal, SDLoc(N), MVT::i32);
   return SDValue();
 }
 
 /// isQVALIGNIShuffleMask - If this is a qvaligni shuffle mask, return the shift
 /// amount, otherwise return -1.
 int PPC::isQVALIGNIShuffleMask(SDNode *N) {
   EVT VT = N->getValueType(0);
   if (VT != MVT::v4f64 && VT != MVT::v4f32 && VT != MVT::v4i1)
     return -1;
 
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
 
   // Find the first non-undef value in the shuffle mask.
   unsigned i;
   for (i = 0; i != 4 && SVOp->getMaskElt(i) < 0; ++i)
     /*search*/;
 
   if (i == 4) return -1;  // all undef.
 
   // Otherwise, check to see if the rest of the elements are consecutively
   // numbered from this value.
   unsigned ShiftAmt = SVOp->getMaskElt(i);
   if (ShiftAmt < i) return -1;
   ShiftAmt -= i;
 
   // Check the rest of the elements to see if they are consecutive.
   for (++i; i != 4; ++i)
     if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
       return -1;
 
   return ShiftAmt;
 }
 
 //===----------------------------------------------------------------------===//
 //  Addressing Mode Selection
 //===----------------------------------------------------------------------===//
 
 /// isIntS16Immediate - This method tests to see if the node is either a 32-bit
 /// or 64-bit immediate, and if the value can be accurately represented as a
 /// sign extension from a 16-bit value.  If so, this returns true and the
 /// immediate.
 bool llvm::isIntS16Immediate(SDNode *N, int16_t &Imm) {
   if (!isa<ConstantSDNode>(N))
     return false;
 
   Imm = (int16_t)cast<ConstantSDNode>(N)->getZExtValue();
   if (N->getValueType(0) == MVT::i32)
     return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
   else
     return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
 }
 bool llvm::isIntS16Immediate(SDValue Op, int16_t &Imm) {
   return isIntS16Immediate(Op.getNode(), Imm);
 }
 
 
 /// SelectAddressEVXRegReg - Given the specified address, check to see if it can
 /// be represented as an indexed [r+r] operation.
 bool PPCTargetLowering::SelectAddressEVXRegReg(SDValue N, SDValue &Base,
                                                SDValue &Index,
                                                SelectionDAG &DAG) const {
   for (SDNode::use_iterator UI = N->use_begin(), E = N->use_end();
       UI != E; ++UI) {
     if (MemSDNode *Memop = dyn_cast<MemSDNode>(*UI)) {
       if (Memop->getMemoryVT() == MVT::f64) {
           Base = N.getOperand(0);
           Index = N.getOperand(1);
           return true;
       }
     }
   }
   return false;
 }
 
 /// SelectAddressRegReg - Given the specified addressed, check to see if it
 /// can be represented as an indexed [r+r] operation.  Returns false if it
 /// can be more efficiently represented as [r+imm]. If \p EncodingAlignment is
 /// non-zero and N can be represented by a base register plus a signed 16-bit
 /// displacement, make a more precise judgement by checking (displacement % \p
 /// EncodingAlignment).
 bool PPCTargetLowering::SelectAddressRegReg(SDValue N, SDValue &Base,
                                             SDValue &Index, SelectionDAG &DAG,
                                             unsigned EncodingAlignment) const {
   int16_t imm = 0;
   if (N.getOpcode() == ISD::ADD) {
     // Is there any SPE load/store (f64), which can't handle 16bit offset?
     // SPE load/store can only handle 8-bit offsets.
     if (hasSPE() && SelectAddressEVXRegReg(N, Base, Index, DAG))
         return true;
     if (isIntS16Immediate(N.getOperand(1), imm) &&
         (!EncodingAlignment || !(imm % EncodingAlignment)))
       return false; // r+i
     if (N.getOperand(1).getOpcode() == PPCISD::Lo)
       return false;    // r+i
 
     Base = N.getOperand(0);
     Index = N.getOperand(1);
     return true;
   } else if (N.getOpcode() == ISD::OR) {
     if (isIntS16Immediate(N.getOperand(1), imm) &&
         (!EncodingAlignment || !(imm % EncodingAlignment)))
       return false; // r+i can fold it if we can.
 
     // If this is an or of disjoint bitfields, we can codegen this as an add
     // (for better address arithmetic) if the LHS and RHS of the OR are provably
     // disjoint.
     KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
 
     if (LHSKnown.Zero.getBoolValue()) {
       KnownBits RHSKnown = DAG.computeKnownBits(N.getOperand(1));
       // If all of the bits are known zero on the LHS or RHS, the add won't
       // carry.
       if (~(LHSKnown.Zero | RHSKnown.Zero) == 0) {
         Base = N.getOperand(0);
         Index = N.getOperand(1);
         return true;
       }
     }
   }
 
   return false;
 }
 
 // If we happen to be doing an i64 load or store into a stack slot that has
 // less than a 4-byte alignment, then the frame-index elimination may need to
 // use an indexed load or store instruction (because the offset may not be a
 // multiple of 4). The extra register needed to hold the offset comes from the
 // register scavenger, and it is possible that the scavenger will need to use
 // an emergency spill slot. As a result, we need to make sure that a spill slot
 // is allocated when doing an i64 load/store into a less-than-4-byte-aligned
 // stack slot.
 static void fixupFuncForFI(SelectionDAG &DAG, int FrameIdx, EVT VT) {
   // FIXME: This does not handle the LWA case.
   if (VT != MVT::i64)
     return;
 
   // NOTE: We'll exclude negative FIs here, which come from argument
   // lowering, because there are no known test cases triggering this problem
   // using packed structures (or similar). We can remove this exclusion if
   // we find such a test case. The reason why this is so test-case driven is
   // because this entire 'fixup' is only to prevent crashes (from the
   // register scavenger) on not-really-valid inputs. For example, if we have:
   //   %a = alloca i1
   //   %b = bitcast i1* %a to i64*
   //   store i64* a, i64 b
   // then the store should really be marked as 'align 1', but is not. If it
   // were marked as 'align 1' then the indexed form would have been
   // instruction-selected initially, and the problem this 'fixup' is preventing
   // won't happen regardless.
   if (FrameIdx < 0)
     return;
 
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
 
   unsigned Align = MFI.getObjectAlignment(FrameIdx);
   if (Align >= 4)
     return;
 
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
   FuncInfo->setHasNonRISpills();
 }
 
 /// Returns true if the address N can be represented by a base register plus
 /// a signed 16-bit displacement [r+imm], and if it is not better
 /// represented as reg+reg.  If \p EncodingAlignment is non-zero, only accept
 /// displacements that are multiples of that value.
 bool PPCTargetLowering::SelectAddressRegImm(SDValue N, SDValue &Disp,
                                             SDValue &Base,
                                             SelectionDAG &DAG,
                                             unsigned EncodingAlignment) const {
   // FIXME dl should come from parent load or store, not from address
   SDLoc dl(N);
   // If this can be more profitably realized as r+r, fail.
   if (SelectAddressRegReg(N, Disp, Base, DAG, EncodingAlignment))
     return false;
 
   if (N.getOpcode() == ISD::ADD) {
     int16_t imm = 0;
     if (isIntS16Immediate(N.getOperand(1), imm) &&
         (!EncodingAlignment || (imm % EncodingAlignment) == 0)) {
       Disp = DAG.getTargetConstant(imm, dl, N.getValueType());
       if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
         Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
         fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
       } else {
         Base = N.getOperand(0);
       }
       return true; // [r+i]
     } else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
       // Match LOAD (ADD (X, Lo(G))).
       assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getZExtValue()
              && "Cannot handle constant offsets yet!");
       Disp = N.getOperand(1).getOperand(0);  // The global address.
       assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
              Disp.getOpcode() == ISD::TargetGlobalTLSAddress ||
              Disp.getOpcode() == ISD::TargetConstantPool ||
              Disp.getOpcode() == ISD::TargetJumpTable);
       Base = N.getOperand(0);
       return true;  // [&g+r]
     }
   } else if (N.getOpcode() == ISD::OR) {
     int16_t imm = 0;
     if (isIntS16Immediate(N.getOperand(1), imm) &&
         (!EncodingAlignment || (imm % EncodingAlignment) == 0)) {
       // If this is an or of disjoint bitfields, we can codegen this as an add
       // (for better address arithmetic) if the LHS and RHS of the OR are
       // provably disjoint.
       KnownBits LHSKnown = DAG.computeKnownBits(N.getOperand(0));
 
       if ((LHSKnown.Zero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
         // If all of the bits are known zero on the LHS or RHS, the add won't
         // carry.
         if (FrameIndexSDNode *FI =
               dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
           Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
           fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
         } else {
           Base = N.getOperand(0);
         }
         Disp = DAG.getTargetConstant(imm, dl, N.getValueType());
         return true;
       }
     }
   } else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
     // Loading from a constant address.
 
     // If this address fits entirely in a 16-bit sext immediate field, codegen
     // this as "d, 0"
     int16_t Imm;
     if (isIntS16Immediate(CN, Imm) &&
         (!EncodingAlignment || (Imm % EncodingAlignment) == 0)) {
       Disp = DAG.getTargetConstant(Imm, dl, CN->getValueType(0));
       Base = DAG.getRegister(Subtarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
                              CN->getValueType(0));
       return true;
     }
 
     // Handle 32-bit sext immediates with LIS + addr mode.
     if ((CN->getValueType(0) == MVT::i32 ||
          (int64_t)CN->getZExtValue() == (int)CN->getZExtValue()) &&
         (!EncodingAlignment || (CN->getZExtValue() % EncodingAlignment) == 0)) {
       int Addr = (int)CN->getZExtValue();
 
       // Otherwise, break this down into an LIS + disp.
       Disp = DAG.getTargetConstant((short)Addr, dl, MVT::i32);
 
       Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, dl,
                                    MVT::i32);
       unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
       Base = SDValue(DAG.getMachineNode(Opc, dl, CN->getValueType(0), Base), 0);
       return true;
     }
   }
 
   Disp = DAG.getTargetConstant(0, dl, getPointerTy(DAG.getDataLayout()));
   if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
     Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
     fixupFuncForFI(DAG, FI->getIndex(), N.getValueType());
   } else
     Base = N;
   return true;      // [r+0]
 }
 
 /// SelectAddressRegRegOnly - Given the specified addressed, force it to be
 /// represented as an indexed [r+r] operation.
 bool PPCTargetLowering::SelectAddressRegRegOnly(SDValue N, SDValue &Base,
                                                 SDValue &Index,
                                                 SelectionDAG &DAG) const {
   // Check to see if we can easily represent this as an [r+r] address.  This
   // will fail if it thinks that the address is more profitably represented as
   // reg+imm, e.g. where imm = 0.
   if (SelectAddressRegReg(N, Base, Index, DAG))
     return true;
 
   // If the address is the result of an add, we will utilize the fact that the
   // address calculation includes an implicit add.  However, we can reduce
   // register pressure if we do not materialize a constant just for use as the
   // index register.  We only get rid of the add if it is not an add of a
   // value and a 16-bit signed constant and both have a single use.
   int16_t imm = 0;
   if (N.getOpcode() == ISD::ADD &&
       (!isIntS16Immediate(N.getOperand(1), imm) ||
        !N.getOperand(1).hasOneUse() || !N.getOperand(0).hasOneUse())) {
     Base = N.getOperand(0);
     Index = N.getOperand(1);
     return true;
   }
 
   // Otherwise, do it the hard way, using R0 as the base register.
   Base = DAG.getRegister(Subtarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
                          N.getValueType());
   Index = N;
   return true;
 }
 
 /// Returns true if we should use a direct load into vector instruction
 /// (such as lxsd or lfd), instead of a load into gpr + direct move sequence.
 static bool usePartialVectorLoads(SDNode *N, const PPCSubtarget& ST) {
 
   // If there are any other uses other than scalar to vector, then we should
   // keep it as a scalar load -> direct move pattern to prevent multiple
   // loads.
   LoadSDNode *LD = dyn_cast<LoadSDNode>(N);
   if (!LD)
     return false;
 
   EVT MemVT = LD->getMemoryVT();
   if (!MemVT.isSimple())
     return false;
   switch(MemVT.getSimpleVT().SimpleTy) {
   case MVT::i64:
     break;
   case MVT::i32:
     if (!ST.hasP8Vector())
       return false;
     break;
   case MVT::i16:
   case MVT::i8:
     if (!ST.hasP9Vector())
       return false;
     break;
   default:
     return false;
   }
 
   SDValue LoadedVal(N, 0);
   if (!LoadedVal.hasOneUse())
     return false;
 
   for (SDNode::use_iterator UI = LD->use_begin(), UE = LD->use_end();
        UI != UE; ++UI)
     if (UI.getUse().get().getResNo() == 0 &&
         UI->getOpcode() != ISD::SCALAR_TO_VECTOR)
       return false;
 
   return true;
 }
 
 /// getPreIndexedAddressParts - returns true by value, base pointer and
 /// offset pointer and addressing mode by reference if the node's address
 /// can be legally represented as pre-indexed load / store address.
 bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
                                                   SDValue &Offset,
                                                   ISD::MemIndexedMode &AM,
                                                   SelectionDAG &DAG) const {
   if (DisablePPCPreinc) return false;
 
   bool isLoad = true;
   SDValue Ptr;
   EVT VT;
   unsigned Alignment;
   if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
     Ptr = LD->getBasePtr();
     VT = LD->getMemoryVT();
     Alignment = LD->getAlignment();
   } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
     Ptr = ST->getBasePtr();
     VT  = ST->getMemoryVT();
     Alignment = ST->getAlignment();
     isLoad = false;
   } else
     return false;
 
   // Do not generate pre-inc forms for specific loads that feed scalar_to_vector
   // instructions because we can fold these into a more efficient instruction
   // instead, (such as LXSD).
   if (isLoad && usePartialVectorLoads(N, Subtarget)) {
     return false;
   }
 
   // PowerPC doesn't have preinc load/store instructions for vectors (except
   // for QPX, which does have preinc r+r forms).
   if (VT.isVector()) {
     if (!Subtarget.hasQPX() || (VT != MVT::v4f64 && VT != MVT::v4f32)) {
       return false;
     } else if (SelectAddressRegRegOnly(Ptr, Offset, Base, DAG)) {
       AM = ISD::PRE_INC;
       return true;
     }
   }
 
   if (SelectAddressRegReg(Ptr, Base, Offset, DAG)) {
     // Common code will reject creating a pre-inc form if the base pointer
     // is a frame index, or if N is a store and the base pointer is either
     // the same as or a predecessor of the value being stored.  Check for
     // those situations here, and try with swapped Base/Offset instead.
     bool Swap = false;
 
     if (isa<FrameIndexSDNode>(Base) || isa<RegisterSDNode>(Base))
       Swap = true;
     else if (!isLoad) {
       SDValue Val = cast<StoreSDNode>(N)->getValue();
       if (Val == Base || Base.getNode()->isPredecessorOf(Val.getNode()))
         Swap = true;
     }
 
     if (Swap)
       std::swap(Base, Offset);
 
     AM = ISD::PRE_INC;
     return true;
   }
 
   // LDU/STU can only handle immediates that are a multiple of 4.
   if (VT != MVT::i64) {
     if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, 0))
       return false;
   } else {
     // LDU/STU need an address with at least 4-byte alignment.
     if (Alignment < 4)
       return false;
 
     if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, 4))
       return false;
   }
 
   if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
     // PPC64 doesn't have lwau, but it does have lwaux.  Reject preinc load of
     // sext i32 to i64 when addr mode is r+i.
     if (LD->getValueType(0) == MVT::i64 && LD->getMemoryVT() == MVT::i32 &&
         LD->getExtensionType() == ISD::SEXTLOAD &&
         isa<ConstantSDNode>(Offset))
       return false;
   }
 
   AM = ISD::PRE_INC;
   return true;
 }
 
 //===----------------------------------------------------------------------===//
 //  LowerOperation implementation
 //===----------------------------------------------------------------------===//
 
 /// Return true if we should reference labels using a PICBase, set the HiOpFlags
 /// and LoOpFlags to the target MO flags.
 static void getLabelAccessInfo(bool IsPIC, const PPCSubtarget &Subtarget,
                                unsigned &HiOpFlags, unsigned &LoOpFlags,
                                const GlobalValue *GV = nullptr) {
   HiOpFlags = PPCII::MO_HA;
   LoOpFlags = PPCII::MO_LO;
 
   // Don't use the pic base if not in PIC relocation model.
   if (IsPIC) {
     HiOpFlags |= PPCII::MO_PIC_FLAG;
     LoOpFlags |= PPCII::MO_PIC_FLAG;
   }
 
   // If this is a reference to a global value that requires a non-lazy-ptr, make
   // sure that instruction lowering adds it.
   if (GV && Subtarget.hasLazyResolverStub(GV)) {
     HiOpFlags |= PPCII::MO_NLP_FLAG;
     LoOpFlags |= PPCII::MO_NLP_FLAG;
 
     if (GV->hasHiddenVisibility()) {
       HiOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
       LoOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
     }
   }
 }
 
 static SDValue LowerLabelRef(SDValue HiPart, SDValue LoPart, bool isPIC,
                              SelectionDAG &DAG) {
   SDLoc DL(HiPart);
   EVT PtrVT = HiPart.getValueType();
   SDValue Zero = DAG.getConstant(0, DL, PtrVT);
 
   SDValue Hi = DAG.getNode(PPCISD::Hi, DL, PtrVT, HiPart, Zero);
   SDValue Lo = DAG.getNode(PPCISD::Lo, DL, PtrVT, LoPart, Zero);
 
   // With PIC, the first instruction is actually "GR+hi(&G)".
   if (isPIC)
     Hi = DAG.getNode(ISD::ADD, DL, PtrVT,
                      DAG.getNode(PPCISD::GlobalBaseReg, DL, PtrVT), Hi);
 
   // Generate non-pic code that has direct accesses to the constant pool.
   // The address of the global is just (hi(&g)+lo(&g)).
   return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
 }
 
 static void setUsesTOCBasePtr(MachineFunction &MF) {
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
   FuncInfo->setUsesTOCBasePtr();
 }
 
 static void setUsesTOCBasePtr(SelectionDAG &DAG) {
   setUsesTOCBasePtr(DAG.getMachineFunction());
 }
 
 SDValue PPCTargetLowering::getTOCEntry(SelectionDAG &DAG, const SDLoc &dl,
                                        SDValue GA) const {
   const bool Is64Bit = Subtarget.isPPC64();
   EVT VT = Is64Bit ? MVT::i64 : MVT::i32;
   SDValue Reg = Is64Bit ? DAG.getRegister(PPC::X2, VT)
                         : Subtarget.isAIXABI()
                               ? DAG.getRegister(PPC::R2, VT)
                               : DAG.getNode(PPCISD::GlobalBaseReg, dl, VT);
   SDValue Ops[] = { GA, Reg };
   return DAG.getMemIntrinsicNode(
       PPCISD::TOC_ENTRY, dl, DAG.getVTList(VT, MVT::Other), Ops, VT,
       MachinePointerInfo::getGOT(DAG.getMachineFunction()), 0,
       MachineMemOperand::MOLoad);
 }
 
 SDValue PPCTargetLowering::LowerConstantPool(SDValue Op,
                                              SelectionDAG &DAG) const {
   EVT PtrVT = Op.getValueType();
   ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
   const Constant *C = CP->getConstVal();
 
   // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
   // The actual address of the GlobalValue is stored in the TOC.
   if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
     setUsesTOCBasePtr(DAG);
     SDValue GA = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0);
     return getTOCEntry(DAG, SDLoc(CP), GA);
   }
 
   unsigned MOHiFlag, MOLoFlag;
   bool IsPIC = isPositionIndependent();
   getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
 
   if (IsPIC && Subtarget.isSVR4ABI()) {
     SDValue GA = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(),
                                            PPCII::MO_PIC_FLAG);
     return getTOCEntry(DAG, SDLoc(CP), GA);
   }
 
   SDValue CPIHi =
     DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOHiFlag);
   SDValue CPILo =
     DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOLoFlag);
   return LowerLabelRef(CPIHi, CPILo, IsPIC, DAG);
 }
 
 // For 64-bit PowerPC, prefer the more compact relative encodings.
 // This trades 32 bits per jump table entry for one or two instructions
 // on the jump site.
 unsigned PPCTargetLowering::getJumpTableEncoding() const {
   if (isJumpTableRelative())
     return MachineJumpTableInfo::EK_LabelDifference32;
 
   return TargetLowering::getJumpTableEncoding();
 }
 
 bool PPCTargetLowering::isJumpTableRelative() const {
   if (UseAbsoluteJumpTables)
     return false;
   if (Subtarget.isPPC64() || Subtarget.isAIXABI())
     return true;
   return TargetLowering::isJumpTableRelative();
 }
 
 SDValue PPCTargetLowering::getPICJumpTableRelocBase(SDValue Table,
                                                     SelectionDAG &DAG) const {
   if (!Subtarget.isPPC64() || Subtarget.isAIXABI())
     return TargetLowering::getPICJumpTableRelocBase(Table, DAG);
 
   switch (getTargetMachine().getCodeModel()) {
   case CodeModel::Small:
   case CodeModel::Medium:
     return TargetLowering::getPICJumpTableRelocBase(Table, DAG);
   default:
     return DAG.getNode(PPCISD::GlobalBaseReg, SDLoc(),
                        getPointerTy(DAG.getDataLayout()));
   }
 }
 
 const MCExpr *
 PPCTargetLowering::getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
                                                 unsigned JTI,
                                                 MCContext &Ctx) const {
   if (!Subtarget.isPPC64() || Subtarget.isAIXABI())
     return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
 
   switch (getTargetMachine().getCodeModel()) {
   case CodeModel::Small:
   case CodeModel::Medium:
     return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
   default:
     return MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
   }
 }
 
 SDValue PPCTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
   EVT PtrVT = Op.getValueType();
   JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
 
   // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
   // The actual address of the GlobalValue is stored in the TOC.
   if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
     setUsesTOCBasePtr(DAG);
     SDValue GA = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
     return getTOCEntry(DAG, SDLoc(JT), GA);
   }
 
   unsigned MOHiFlag, MOLoFlag;
   bool IsPIC = isPositionIndependent();
   getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
 
   if (IsPIC && Subtarget.isSVR4ABI()) {
     SDValue GA = DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
                                         PPCII::MO_PIC_FLAG);
     return getTOCEntry(DAG, SDLoc(GA), GA);
   }
 
   SDValue JTIHi = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOHiFlag);
   SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOLoFlag);
   return LowerLabelRef(JTIHi, JTILo, IsPIC, DAG);
 }
 
 SDValue PPCTargetLowering::LowerBlockAddress(SDValue Op,
                                              SelectionDAG &DAG) const {
   EVT PtrVT = Op.getValueType();
   BlockAddressSDNode *BASDN = cast<BlockAddressSDNode>(Op);
   const BlockAddress *BA = BASDN->getBlockAddress();
 
   // 64-bit SVR4 ABI and AIX ABI code are always position-independent.
   // The actual BlockAddress is stored in the TOC.
   if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
     setUsesTOCBasePtr(DAG);
     SDValue GA = DAG.getTargetBlockAddress(BA, PtrVT, BASDN->getOffset());
     return getTOCEntry(DAG, SDLoc(BASDN), GA);
   }
 
   // 32-bit position-independent ELF stores the BlockAddress in the .got.
   if (Subtarget.is32BitELFABI() && isPositionIndependent())
     return getTOCEntry(
         DAG, SDLoc(BASDN),
         DAG.getTargetBlockAddress(BA, PtrVT, BASDN->getOffset()));
 
   unsigned MOHiFlag, MOLoFlag;
   bool IsPIC = isPositionIndependent();
   getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag);
   SDValue TgtBAHi = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOHiFlag);
   SDValue TgtBALo = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOLoFlag);
   return LowerLabelRef(TgtBAHi, TgtBALo, IsPIC, DAG);
 }
 
 SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
                                               SelectionDAG &DAG) const {
   // FIXME: TLS addresses currently use medium model code sequences,
   // which is the most useful form.  Eventually support for small and
   // large models could be added if users need it, at the cost of
   // additional complexity.
   GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
   if (DAG.getTarget().useEmulatedTLS())
     return LowerToTLSEmulatedModel(GA, DAG);
 
   SDLoc dl(GA);
   const GlobalValue *GV = GA->getGlobal();
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   bool is64bit = Subtarget.isPPC64();
   const Module *M = DAG.getMachineFunction().getFunction().getParent();
   PICLevel::Level picLevel = M->getPICLevel();
 
   const TargetMachine &TM = getTargetMachine();
   TLSModel::Model Model = TM.getTLSModel(GV);
 
   if (Model == TLSModel::LocalExec) {
     SDValue TGAHi = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                                PPCII::MO_TPREL_HA);
     SDValue TGALo = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                                PPCII::MO_TPREL_LO);
     SDValue TLSReg = is64bit ? DAG.getRegister(PPC::X13, MVT::i64)
                              : DAG.getRegister(PPC::R2, MVT::i32);
 
     SDValue Hi = DAG.getNode(PPCISD::Hi, dl, PtrVT, TGAHi, TLSReg);
     return DAG.getNode(PPCISD::Lo, dl, PtrVT, TGALo, Hi);
   }
 
   if (Model == TLSModel::InitialExec) {
     SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
     SDValue TGATLS = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
                                                 PPCII::MO_TLS);
     SDValue GOTPtr;
     if (is64bit) {
       setUsesTOCBasePtr(DAG);
       SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
       GOTPtr = DAG.getNode(PPCISD::ADDIS_GOT_TPREL_HA, dl,
                            PtrVT, GOTReg, TGA);
     } else {
       if (!TM.isPositionIndependent())
         GOTPtr = DAG.getNode(PPCISD::PPC32_GOT, dl, PtrVT);
       else if (picLevel == PICLevel::SmallPIC)
         GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
       else
         GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
     }
     SDValue TPOffset = DAG.getNode(PPCISD::LD_GOT_TPREL_L, dl,
                                    PtrVT, TGA, GOTPtr);
     return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TPOffset, TGATLS);
   }
 
   if (Model == TLSModel::GeneralDynamic) {
     SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
     SDValue GOTPtr;
     if (is64bit) {
       setUsesTOCBasePtr(DAG);
       SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
       GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSGD_HA, dl, PtrVT,
                                    GOTReg, TGA);
     } else {
       if (picLevel == PICLevel::SmallPIC)
         GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
       else
         GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
     }
     return DAG.getNode(PPCISD::ADDI_TLSGD_L_ADDR, dl, PtrVT,
                        GOTPtr, TGA, TGA);
   }
 
   if (Model == TLSModel::LocalDynamic) {
     SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
     SDValue GOTPtr;
     if (is64bit) {
       setUsesTOCBasePtr(DAG);
       SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
       GOTPtr = DAG.getNode(PPCISD::ADDIS_TLSLD_HA, dl, PtrVT,
                            GOTReg, TGA);
     } else {
       if (picLevel == PICLevel::SmallPIC)
         GOTPtr = DAG.getNode(PPCISD::GlobalBaseReg, dl, PtrVT);
       else
         GOTPtr = DAG.getNode(PPCISD::PPC32_PICGOT, dl, PtrVT);
     }
     SDValue TLSAddr = DAG.getNode(PPCISD::ADDI_TLSLD_L_ADDR, dl,
                                   PtrVT, GOTPtr, TGA, TGA);
     SDValue DtvOffsetHi = DAG.getNode(PPCISD::ADDIS_DTPREL_HA, dl,
                                       PtrVT, TLSAddr, TGA);
     return DAG.getNode(PPCISD::ADDI_DTPREL_L, dl, PtrVT, DtvOffsetHi, TGA);
   }
 
   llvm_unreachable("Unknown TLS model!");
 }
 
 SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
                                               SelectionDAG &DAG) const {
   EVT PtrVT = Op.getValueType();
   GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
   SDLoc DL(GSDN);
   const GlobalValue *GV = GSDN->getGlobal();
 
   // 64-bit SVR4 ABI & AIX ABI code is always position-independent.
   // The actual address of the GlobalValue is stored in the TOC.
   if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
     setUsesTOCBasePtr(DAG);
     SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset());
     return getTOCEntry(DAG, DL, GA);
   }
 
   unsigned MOHiFlag, MOLoFlag;
   bool IsPIC = isPositionIndependent();
   getLabelAccessInfo(IsPIC, Subtarget, MOHiFlag, MOLoFlag, GV);
 
   if (IsPIC && Subtarget.isSVR4ABI()) {
     SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT,
                                             GSDN->getOffset(),
                                             PPCII::MO_PIC_FLAG);
     return getTOCEntry(DAG, DL, GA);
   }
 
   SDValue GAHi =
     DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOHiFlag);
   SDValue GALo =
     DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOLoFlag);
 
   SDValue Ptr = LowerLabelRef(GAHi, GALo, IsPIC, DAG);
 
   // If the global reference is actually to a non-lazy-pointer, we have to do an
   // extra load to get the address of the global.
   if (MOHiFlag & PPCII::MO_NLP_FLAG)
     Ptr = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), Ptr, MachinePointerInfo());
   return Ptr;
 }
 
 SDValue PPCTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
   ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
   SDLoc dl(Op);
 
   if (Op.getValueType() == MVT::v2i64) {
     // When the operands themselves are v2i64 values, we need to do something
     // special because VSX has no underlying comparison operations for these.
     if (Op.getOperand(0).getValueType() == MVT::v2i64) {
       // Equality can be handled by casting to the legal type for Altivec
       // comparisons, everything else needs to be expanded.
       if (CC == ISD::SETEQ || CC == ISD::SETNE) {
         return DAG.getNode(ISD::BITCAST, dl, MVT::v2i64,
                  DAG.getSetCC(dl, MVT::v4i32,
                    DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, Op.getOperand(0)),
                    DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, Op.getOperand(1)),
                    CC));
       }
 
       return SDValue();
     }
 
     // We handle most of these in the usual way.
     return Op;
   }
 
   // If we're comparing for equality to zero, expose the fact that this is
   // implemented as a ctlz/srl pair on ppc, so that the dag combiner can
   // fold the new nodes.
   if (SDValue V = lowerCmpEqZeroToCtlzSrl(Op, DAG))
     return V;
 
   if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
     // Leave comparisons against 0 and -1 alone for now, since they're usually
     // optimized.  FIXME: revisit this when we can custom lower all setcc
     // optimizations.
     if (C->isAllOnesValue() || C->isNullValue())
       return SDValue();
   }
 
   // If we have an integer seteq/setne, turn it into a compare against zero
   // by xor'ing the rhs with the lhs, which is faster than setting a
   // condition register, reading it back out, and masking the correct bit.  The
   // normal approach here uses sub to do this instead of xor.  Using xor exposes
   // the result to other bit-twiddling opportunities.
   EVT LHSVT = Op.getOperand(0).getValueType();
   if (LHSVT.isInteger() && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
     EVT VT = Op.getValueType();
     SDValue Sub = DAG.getNode(ISD::XOR, dl, LHSVT, Op.getOperand(0),
                                 Op.getOperand(1));
     return DAG.getSetCC(dl, VT, Sub, DAG.getConstant(0, dl, LHSVT), CC);
   }
   return SDValue();
 }
 
 SDValue PPCTargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
   SDNode *Node = Op.getNode();
   EVT VT = Node->getValueType(0);
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   SDValue InChain = Node->getOperand(0);
   SDValue VAListPtr = Node->getOperand(1);
   const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
   SDLoc dl(Node);
 
   assert(!Subtarget.isPPC64() && "LowerVAARG is PPC32 only");
 
   // gpr_index
   SDValue GprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
                                     VAListPtr, MachinePointerInfo(SV), MVT::i8);
   InChain = GprIndex.getValue(1);
 
   if (VT == MVT::i64) {
     // Check if GprIndex is even
     SDValue GprAnd = DAG.getNode(ISD::AND, dl, MVT::i32, GprIndex,
                                  DAG.getConstant(1, dl, MVT::i32));
     SDValue CC64 = DAG.getSetCC(dl, MVT::i32, GprAnd,
                                 DAG.getConstant(0, dl, MVT::i32), ISD::SETNE);
     SDValue GprIndexPlusOne = DAG.getNode(ISD::ADD, dl, MVT::i32, GprIndex,
                                           DAG.getConstant(1, dl, MVT::i32));
     // Align GprIndex to be even if it isn't
     GprIndex = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC64, GprIndexPlusOne,
                            GprIndex);
   }
 
   // fpr index is 1 byte after gpr
   SDValue FprPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
                                DAG.getConstant(1, dl, MVT::i32));
 
   // fpr
   SDValue FprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
                                     FprPtr, MachinePointerInfo(SV), MVT::i8);
   InChain = FprIndex.getValue(1);
 
   SDValue RegSaveAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
                                        DAG.getConstant(8, dl, MVT::i32));
 
   SDValue OverflowAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
                                         DAG.getConstant(4, dl, MVT::i32));
 
   // areas
   SDValue OverflowArea =
       DAG.getLoad(MVT::i32, dl, InChain, OverflowAreaPtr, MachinePointerInfo());
   InChain = OverflowArea.getValue(1);
 
   SDValue RegSaveArea =
       DAG.getLoad(MVT::i32, dl, InChain, RegSaveAreaPtr, MachinePointerInfo());
   InChain = RegSaveArea.getValue(1);
 
   // select overflow_area if index > 8
   SDValue CC = DAG.getSetCC(dl, MVT::i32, VT.isInteger() ? GprIndex : FprIndex,
                             DAG.getConstant(8, dl, MVT::i32), ISD::SETLT);
 
   // adjustment constant gpr_index * 4/8
   SDValue RegConstant = DAG.getNode(ISD::MUL, dl, MVT::i32,
                                     VT.isInteger() ? GprIndex : FprIndex,
                                     DAG.getConstant(VT.isInteger() ? 4 : 8, dl,
                                                     MVT::i32));
 
   // OurReg = RegSaveArea + RegConstant
   SDValue OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, RegSaveArea,
                                RegConstant);
 
   // Floating types are 32 bytes into RegSaveArea
   if (VT.isFloatingPoint())
     OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, OurReg,
                          DAG.getConstant(32, dl, MVT::i32));
 
   // increase {f,g}pr_index by 1 (or 2 if VT is i64)
   SDValue IndexPlus1 = DAG.getNode(ISD::ADD, dl, MVT::i32,
                                    VT.isInteger() ? GprIndex : FprIndex,
                                    DAG.getConstant(VT == MVT::i64 ? 2 : 1, dl,
                                                    MVT::i32));
 
   InChain = DAG.getTruncStore(InChain, dl, IndexPlus1,
                               VT.isInteger() ? VAListPtr : FprPtr,
                               MachinePointerInfo(SV), MVT::i8);
 
   // determine if we should load from reg_save_area or overflow_area
   SDValue Result = DAG.getNode(ISD::SELECT, dl, PtrVT, CC, OurReg, OverflowArea);
 
   // increase overflow_area by 4/8 if gpr/fpr > 8
   SDValue OverflowAreaPlusN = DAG.getNode(ISD::ADD, dl, PtrVT, OverflowArea,
                                           DAG.getConstant(VT.isInteger() ? 4 : 8,
                                           dl, MVT::i32));
 
   OverflowArea = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC, OverflowArea,
                              OverflowAreaPlusN);
 
   InChain = DAG.getTruncStore(InChain, dl, OverflowArea, OverflowAreaPtr,
                               MachinePointerInfo(), MVT::i32);
 
   return DAG.getLoad(VT, dl, InChain, Result, MachinePointerInfo());
 }
 
 SDValue PPCTargetLowering::LowerVACOPY(SDValue Op, SelectionDAG &DAG) const {
   assert(!Subtarget.isPPC64() && "LowerVACOPY is PPC32 only");
 
   // We have to copy the entire va_list struct:
   // 2*sizeof(char) + 2 Byte alignment + 2*sizeof(char*) = 12 Byte
   return DAG.getMemcpy(Op.getOperand(0), Op,
                        Op.getOperand(1), Op.getOperand(2),
                        DAG.getConstant(12, SDLoc(Op), MVT::i32), 8, false, true,
                        false, MachinePointerInfo(), MachinePointerInfo());
 }
 
 SDValue PPCTargetLowering::LowerADJUST_TRAMPOLINE(SDValue Op,
                                                   SelectionDAG &DAG) const {
   if (Subtarget.isAIXABI())
     report_fatal_error("ADJUST_TRAMPOLINE operation is not supported on AIX.");
 
   return Op.getOperand(0);
 }
 
 SDValue PPCTargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
                                                 SelectionDAG &DAG) const {
   if (Subtarget.isAIXABI())
     report_fatal_error("INIT_TRAMPOLINE operation is not supported on AIX.");
 
   SDValue Chain = Op.getOperand(0);
   SDValue Trmp = Op.getOperand(1); // trampoline
   SDValue FPtr = Op.getOperand(2); // nested function
   SDValue Nest = Op.getOperand(3); // 'nest' parameter value
   SDLoc dl(Op);
 
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   bool isPPC64 = (PtrVT == MVT::i64);
   Type *IntPtrTy = DAG.getDataLayout().getIntPtrType(*DAG.getContext());
 
   TargetLowering::ArgListTy Args;
   TargetLowering::ArgListEntry Entry;
 
   Entry.Ty = IntPtrTy;
   Entry.Node = Trmp; Args.push_back(Entry);
 
   // TrampSize == (isPPC64 ? 48 : 40);
   Entry.Node = DAG.getConstant(isPPC64 ? 48 : 40, dl,
                                isPPC64 ? MVT::i64 : MVT::i32);
   Args.push_back(Entry);
 
   Entry.Node = FPtr; Args.push_back(Entry);
   Entry.Node = Nest; Args.push_back(Entry);
 
   // Lower to a call to __trampoline_setup(Trmp, TrampSize, FPtr, ctx_reg)
   TargetLowering::CallLoweringInfo CLI(DAG);
   CLI.setDebugLoc(dl).setChain(Chain).setLibCallee(
       CallingConv::C, Type::getVoidTy(*DAG.getContext()),
       DAG.getExternalSymbol("__trampoline_setup", PtrVT), std::move(Args));
 
   std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
   return CallResult.second;
 }
 
 SDValue PPCTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
   MachineFunction &MF = DAG.getMachineFunction();
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
   EVT PtrVT = getPointerTy(MF.getDataLayout());
 
   SDLoc dl(Op);
 
   if (Subtarget.isDarwinABI() || Subtarget.isPPC64()) {
     // vastart just stores the address of the VarArgsFrameIndex slot into the
     // memory location argument.
     SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
     const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
     return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1),
                         MachinePointerInfo(SV));
   }
 
   // For the 32-bit SVR4 ABI we follow the layout of the va_list struct.
   // We suppose the given va_list is already allocated.
   //
   // typedef struct {
   //  char gpr;     /* index into the array of 8 GPRs
   //                 * stored in the register save area
   //                 * gpr=0 corresponds to r3,
   //                 * gpr=1 to r4, etc.
   //                 */
   //  char fpr;     /* index into the array of 8 FPRs
   //                 * stored in the register save area
   //                 * fpr=0 corresponds to f1,
   //                 * fpr=1 to f2, etc.
   //                 */
   //  char *overflow_arg_area;
   //                /* location on stack that holds
   //                 * the next overflow argument
   //                 */
   //  char *reg_save_area;
   //               /* where r3:r10 and f1:f8 (if saved)
   //                * are stored
   //                */
   // } va_list[1];
 
   SDValue ArgGPR = DAG.getConstant(FuncInfo->getVarArgsNumGPR(), dl, MVT::i32);
   SDValue ArgFPR = DAG.getConstant(FuncInfo->getVarArgsNumFPR(), dl, MVT::i32);
   SDValue StackOffsetFI = DAG.getFrameIndex(FuncInfo->getVarArgsStackOffset(),
                                             PtrVT);
   SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
                                  PtrVT);
 
   uint64_t FrameOffset = PtrVT.getSizeInBits()/8;
   SDValue ConstFrameOffset = DAG.getConstant(FrameOffset, dl, PtrVT);
 
   uint64_t StackOffset = PtrVT.getSizeInBits()/8 - 1;
   SDValue ConstStackOffset = DAG.getConstant(StackOffset, dl, PtrVT);
 
   uint64_t FPROffset = 1;
   SDValue ConstFPROffset = DAG.getConstant(FPROffset, dl, PtrVT);
 
   const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
 
   // Store first byte : number of int regs
   SDValue firstStore =
       DAG.getTruncStore(Op.getOperand(0), dl, ArgGPR, Op.getOperand(1),
                         MachinePointerInfo(SV), MVT::i8);
   uint64_t nextOffset = FPROffset;
   SDValue nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, Op.getOperand(1),
                                   ConstFPROffset);
 
   // Store second byte : number of float regs
   SDValue secondStore =
       DAG.getTruncStore(firstStore, dl, ArgFPR, nextPtr,
                         MachinePointerInfo(SV, nextOffset), MVT::i8);
   nextOffset += StackOffset;
   nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstStackOffset);
 
   // Store second word : arguments given on stack
   SDValue thirdStore = DAG.getStore(secondStore, dl, StackOffsetFI, nextPtr,
                                     MachinePointerInfo(SV, nextOffset));
   nextOffset += FrameOffset;
   nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstFrameOffset);
 
   // Store third word : arguments given in registers
   return DAG.getStore(thirdStore, dl, FR, nextPtr,
                       MachinePointerInfo(SV, nextOffset));
 }
 
 /// FPR - The set of FP registers that should be allocated for arguments
 /// on Darwin and AIX.
 static const MCPhysReg FPR[] = {PPC::F1,  PPC::F2,  PPC::F3, PPC::F4, PPC::F5,
                                 PPC::F6,  PPC::F7,  PPC::F8, PPC::F9, PPC::F10,
                                 PPC::F11, PPC::F12, PPC::F13};
 
 /// QFPR - The set of QPX registers that should be allocated for arguments.
 static const MCPhysReg QFPR[] = {
     PPC::QF1, PPC::QF2, PPC::QF3,  PPC::QF4,  PPC::QF5,  PPC::QF6, PPC::QF7,
     PPC::QF8, PPC::QF9, PPC::QF10, PPC::QF11, PPC::QF12, PPC::QF13};
 
 /// CalculateStackSlotSize - Calculates the size reserved for this argument on
 /// the stack.
 static unsigned CalculateStackSlotSize(EVT ArgVT, ISD::ArgFlagsTy Flags,
                                        unsigned PtrByteSize) {
   unsigned ArgSize = ArgVT.getStoreSize();
   if (Flags.isByVal())
     ArgSize = Flags.getByValSize();
 
   // Round up to multiples of the pointer size, except for array members,
   // which are always packed.
   if (!Flags.isInConsecutiveRegs())
     ArgSize = ((ArgSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
 
   return ArgSize;
 }
 
 /// CalculateStackSlotAlignment - Calculates the alignment of this argument
 /// on the stack.
 static unsigned CalculateStackSlotAlignment(EVT ArgVT, EVT OrigVT,
                                             ISD::ArgFlagsTy Flags,
                                             unsigned PtrByteSize) {
   unsigned Align = PtrByteSize;
 
   // Altivec parameters are padded to a 16 byte boundary.
   if (ArgVT == MVT::v4f32 || ArgVT == MVT::v4i32 ||
       ArgVT == MVT::v8i16 || ArgVT == MVT::v16i8 ||
       ArgVT == MVT::v2f64 || ArgVT == MVT::v2i64 ||
       ArgVT == MVT::v1i128 || ArgVT == MVT::f128)
     Align = 16;
   // QPX vector types stored in double-precision are padded to a 32 byte
   // boundary.
   else if (ArgVT == MVT::v4f64 || ArgVT == MVT::v4i1)
     Align = 32;
 
   // ByVal parameters are aligned as requested.
   if (Flags.isByVal()) {
     unsigned BVAlign = Flags.getByValAlign();
     if (BVAlign > PtrByteSize) {
       if (BVAlign % PtrByteSize != 0)
           llvm_unreachable(
             "ByVal alignment is not a multiple of the pointer size");
 
       Align = BVAlign;
     }
   }
 
   // Array members are always packed to their original alignment.
   if (Flags.isInConsecutiveRegs()) {
     // If the array member was split into multiple registers, the first
     // needs to be aligned to the size of the full type.  (Except for
     // ppcf128, which is only aligned as its f64 components.)
     if (Flags.isSplit() && OrigVT != MVT::ppcf128)
       Align = OrigVT.getStoreSize();
     else
       Align = ArgVT.getStoreSize();
   }
 
   return Align;
 }
 
 /// CalculateStackSlotUsed - Return whether this argument will use its
 /// stack slot (instead of being passed in registers).  ArgOffset,
 /// AvailableFPRs, and AvailableVRs must hold the current argument
 /// position, and will be updated to account for this argument.
 static bool CalculateStackSlotUsed(EVT ArgVT, EVT OrigVT,
                                    ISD::ArgFlagsTy Flags,
                                    unsigned PtrByteSize,
                                    unsigned LinkageSize,
                                    unsigned ParamAreaSize,
                                    unsigned &ArgOffset,
                                    unsigned &AvailableFPRs,
                                    unsigned &AvailableVRs, bool HasQPX) {
   bool UseMemory = false;
 
   // Respect alignment of argument on the stack.
   unsigned Align =
     CalculateStackSlotAlignment(ArgVT, OrigVT, Flags, PtrByteSize);
   ArgOffset = ((ArgOffset + Align - 1) / Align) * Align;
   // If there's no space left in the argument save area, we must
   // use memory (this check also catches zero-sized arguments).
   if (ArgOffset >= LinkageSize + ParamAreaSize)
     UseMemory = true;
 
   // Allocate argument on the stack.
   ArgOffset += CalculateStackSlotSize(ArgVT, Flags, PtrByteSize);
   if (Flags.isInConsecutiveRegsLast())
     ArgOffset = ((ArgOffset + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
   // If we overran the argument save area, we must use memory
   // (this check catches arguments passed partially in memory)
   if (ArgOffset > LinkageSize + ParamAreaSize)
     UseMemory = true;
 
   // However, if the argument is actually passed in an FPR or a VR,
   // we don't use memory after all.
   if (!Flags.isByVal()) {
     if (ArgVT == MVT::f32 || ArgVT == MVT::f64 ||
         // QPX registers overlap with the scalar FP registers.
         (HasQPX && (ArgVT == MVT::v4f32 ||
                     ArgVT == MVT::v4f64 ||
                     ArgVT == MVT::v4i1)))
       if (AvailableFPRs > 0) {
         --AvailableFPRs;
         return false;
       }
     if (ArgVT == MVT::v4f32 || ArgVT == MVT::v4i32 ||
         ArgVT == MVT::v8i16 || ArgVT == MVT::v16i8 ||
         ArgVT == MVT::v2f64 || ArgVT == MVT::v2i64 ||
         ArgVT == MVT::v1i128 || ArgVT == MVT::f128)
       if (AvailableVRs > 0) {
         --AvailableVRs;
         return false;
       }
   }
 
   return UseMemory;
 }
 
 /// EnsureStackAlignment - Round stack frame size up from NumBytes to
 /// ensure minimum alignment required for target.
 static unsigned EnsureStackAlignment(const PPCFrameLowering *Lowering,
                                      unsigned NumBytes) {
   unsigned TargetAlign = Lowering->getStackAlignment();
   unsigned AlignMask = TargetAlign - 1;
   NumBytes = (NumBytes + AlignMask) & ~AlignMask;
   return NumBytes;
 }
 
 SDValue PPCTargetLowering::LowerFormalArguments(
     SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
   if (Subtarget.isAIXABI())
     return LowerFormalArguments_AIX(Chain, CallConv, isVarArg, Ins, dl, DAG,
                                     InVals);
   if (Subtarget.is64BitELFABI())
     return LowerFormalArguments_64SVR4(Chain, CallConv, isVarArg, Ins, dl, DAG,
                                        InVals);
   if (Subtarget.is32BitELFABI())
     return LowerFormalArguments_32SVR4(Chain, CallConv, isVarArg, Ins, dl, DAG,
                                        InVals);
 
   return LowerFormalArguments_Darwin(Chain, CallConv, isVarArg, Ins, dl, DAG,
                                      InVals);
 }
 
 SDValue PPCTargetLowering::LowerFormalArguments_32SVR4(
     SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
 
   // 32-bit SVR4 ABI Stack Frame Layout:
   //              +-----------------------------------+
   //        +-->  |            Back chain             |
   //        |     +-----------------------------------+
   //        |     | Floating-point register save area |
   //        |     +-----------------------------------+
   //        |     |    General register save area     |
   //        |     +-----------------------------------+
   //        |     |          CR save word             |
   //        |     +-----------------------------------+
   //        |     |         VRSAVE save word          |
   //        |     +-----------------------------------+
   //        |     |         Alignment padding         |
   //        |     +-----------------------------------+
   //        |     |     Vector register save area     |
   //        |     +-----------------------------------+
   //        |     |       Local variable space        |
   //        |     +-----------------------------------+
   //        |     |        Parameter list area        |
   //        |     +-----------------------------------+
   //        |     |           LR save word            |
   //        |     +-----------------------------------+
   // SP-->  +---  |            Back chain             |
   //              +-----------------------------------+
   //
   // Specifications:
   //   System V Application Binary Interface PowerPC Processor Supplement
   //   AltiVec Technology Programming Interface Manual
 
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
 
   EVT PtrVT = getPointerTy(MF.getDataLayout());
   // Potential tail calls could cause overwriting of argument stack slots.
   bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
                        (CallConv == CallingConv::Fast));
   unsigned PtrByteSize = 4;
 
   // Assign locations to all of the incoming arguments.
   SmallVector<CCValAssign, 16> ArgLocs;
   PPCCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
                  *DAG.getContext());
 
   // Reserve space for the linkage area on the stack.
   unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   CCInfo.AllocateStack(LinkageSize, PtrByteSize);
   if (useSoftFloat())
     CCInfo.PreAnalyzeFormalArguments(Ins);
 
   CCInfo.AnalyzeFormalArguments(Ins, CC_PPC32_SVR4);
   CCInfo.clearWasPPCF128();
 
   for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
     CCValAssign &VA = ArgLocs[i];
 
     // Arguments stored in registers.
     if (VA.isRegLoc()) {
       const TargetRegisterClass *RC;
       EVT ValVT = VA.getValVT();
 
       switch (ValVT.getSimpleVT().SimpleTy) {
         default:
           llvm_unreachable("ValVT not supported by formal arguments Lowering");
         case MVT::i1:
         case MVT::i32:
           RC = &PPC::GPRCRegClass;
           break;
         case MVT::f32:
           if (Subtarget.hasP8Vector())
             RC = &PPC::VSSRCRegClass;
           else if (Subtarget.hasSPE())
             RC = &PPC::GPRCRegClass;
           else
             RC = &PPC::F4RCRegClass;
           break;
         case MVT::f64:
           if (Subtarget.hasVSX())
             RC = &PPC::VSFRCRegClass;
           else if (Subtarget.hasSPE())
             // SPE passes doubles in GPR pairs.
             RC = &PPC::GPRCRegClass;
           else
             RC = &PPC::F8RCRegClass;
           break;
         case MVT::v16i8:
         case MVT::v8i16:
         case MVT::v4i32:
           RC = &PPC::VRRCRegClass;
           break;
         case MVT::v4f32:
           RC = Subtarget.hasQPX() ? &PPC::QSRCRegClass : &PPC::VRRCRegClass;
           break;
         case MVT::v2f64:
         case MVT::v2i64:
           RC = &PPC::VRRCRegClass;
           break;
         case MVT::v4f64:
           RC = &PPC::QFRCRegClass;
           break;
         case MVT::v4i1:
           RC = &PPC::QBRCRegClass;
           break;
       }
 
       SDValue ArgValue;
       // Transform the arguments stored in physical registers into
       // virtual ones.
       if (VA.getLocVT() == MVT::f64 && Subtarget.hasSPE()) {
         assert(i + 1 < e && "No second half of double precision argument");
         unsigned RegLo = MF.addLiveIn(VA.getLocReg(), RC);
         unsigned RegHi = MF.addLiveIn(ArgLocs[++i].getLocReg(), RC);
         SDValue ArgValueLo = DAG.getCopyFromReg(Chain, dl, RegLo, MVT::i32);
         SDValue ArgValueHi = DAG.getCopyFromReg(Chain, dl, RegHi, MVT::i32);
         if (!Subtarget.isLittleEndian())
           std::swap (ArgValueLo, ArgValueHi);
         ArgValue = DAG.getNode(PPCISD::BUILD_SPE64, dl, MVT::f64, ArgValueLo,
                                ArgValueHi);
       } else {
         unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
         ArgValue = DAG.getCopyFromReg(Chain, dl, Reg,
                                       ValVT == MVT::i1 ? MVT::i32 : ValVT);
         if (ValVT == MVT::i1)
           ArgValue = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, ArgValue);
       }
 
       InVals.push_back(ArgValue);
     } else {
       // Argument stored in memory.
       assert(VA.isMemLoc());
 
       // Get the extended size of the argument type in stack
       unsigned ArgSize = VA.getLocVT().getStoreSize();
       // Get the actual size of the argument type
       unsigned ObjSize = VA.getValVT().getStoreSize();
       unsigned ArgOffset = VA.getLocMemOffset();
       // Stack objects in PPC32 are right justified.
       ArgOffset += ArgSize - ObjSize;
       int FI = MFI.CreateFixedObject(ArgSize, ArgOffset, isImmutable);
 
       // Create load nodes to retrieve arguments from the stack.
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
       InVals.push_back(
           DAG.getLoad(VA.getValVT(), dl, Chain, FIN, MachinePointerInfo()));
     }
   }
 
   // Assign locations to all of the incoming aggregate by value arguments.
   // Aggregates passed by value are stored in the local variable space of the
   // caller's stack frame, right above the parameter list area.
   SmallVector<CCValAssign, 16> ByValArgLocs;
   CCState CCByValInfo(CallConv, isVarArg, DAG.getMachineFunction(),
                       ByValArgLocs, *DAG.getContext());
 
   // Reserve stack space for the allocations in CCInfo.
   CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
 
   CCByValInfo.AnalyzeFormalArguments(Ins, CC_PPC32_SVR4_ByVal);
 
   // Area that is at least reserved in the caller of this function.
   unsigned MinReservedArea = CCByValInfo.getNextStackOffset();
   MinReservedArea = std::max(MinReservedArea, LinkageSize);
 
   // Set the size that is at least reserved in caller of this function.  Tail
   // call optimized function's reserved stack space needs to be aligned so that
   // taking the difference between two stack areas will result in an aligned
   // stack.
   MinReservedArea =
       EnsureStackAlignment(Subtarget.getFrameLowering(), MinReservedArea);
   FuncInfo->setMinReservedArea(MinReservedArea);
 
   SmallVector<SDValue, 8> MemOps;
 
   // If the function takes variable number of arguments, make a frame index for
   // the start of the first vararg value... for expansion of llvm.va_start.
   if (isVarArg) {
     static const MCPhysReg GPArgRegs[] = {
       PPC::R3, PPC::R4, PPC::R5, PPC::R6,
       PPC::R7, PPC::R8, PPC::R9, PPC::R10,
     };
     const unsigned NumGPArgRegs = array_lengthof(GPArgRegs);
 
     static const MCPhysReg FPArgRegs[] = {
       PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
       PPC::F8
     };
     unsigned NumFPArgRegs = array_lengthof(FPArgRegs);
 
     if (useSoftFloat() || hasSPE())
        NumFPArgRegs = 0;
 
     FuncInfo->setVarArgsNumGPR(CCInfo.getFirstUnallocated(GPArgRegs));
     FuncInfo->setVarArgsNumFPR(CCInfo.getFirstUnallocated(FPArgRegs));
 
     // Make room for NumGPArgRegs and NumFPArgRegs.
     int Depth = NumGPArgRegs * PtrVT.getSizeInBits()/8 +
                 NumFPArgRegs * MVT(MVT::f64).getSizeInBits()/8;
 
     FuncInfo->setVarArgsStackOffset(
       MFI.CreateFixedObject(PtrVT.getSizeInBits()/8,
                             CCInfo.getNextStackOffset(), true));
 
     FuncInfo->setVarArgsFrameIndex(MFI.CreateStackObject(Depth, 8, false));
     SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
 
     // The fixed integer arguments of a variadic function are stored to the
     // VarArgsFrameIndex on the stack so that they may be loaded by
     // dereferencing the result of va_next.
     for (unsigned GPRIndex = 0; GPRIndex != NumGPArgRegs; ++GPRIndex) {
       // Get an existing live-in vreg, or add a new one.
       unsigned VReg = MF.getRegInfo().getLiveInVirtReg(GPArgRegs[GPRIndex]);
       if (!VReg)
         VReg = MF.addLiveIn(GPArgRegs[GPRIndex], &PPC::GPRCRegClass);
 
       SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
       SDValue Store =
           DAG.getStore(Val.getValue(1), dl, Val, FIN, MachinePointerInfo());
       MemOps.push_back(Store);
       // Increment the address by four for the next argument to store
       SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, dl, PtrVT);
       FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
     }
 
     // FIXME 32-bit SVR4: We only need to save FP argument registers if CR bit 6
     // is set.
     // The double arguments are stored to the VarArgsFrameIndex
     // on the stack.
     for (unsigned FPRIndex = 0; FPRIndex != NumFPArgRegs; ++FPRIndex) {
       // Get an existing live-in vreg, or add a new one.
       unsigned VReg = MF.getRegInfo().getLiveInVirtReg(FPArgRegs[FPRIndex]);
       if (!VReg)
         VReg = MF.addLiveIn(FPArgRegs[FPRIndex], &PPC::F8RCRegClass);
 
       SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::f64);
       SDValue Store =
           DAG.getStore(Val.getValue(1), dl, Val, FIN, MachinePointerInfo());
       MemOps.push_back(Store);
       // Increment the address by eight for the next argument to store
       SDValue PtrOff = DAG.getConstant(MVT(MVT::f64).getSizeInBits()/8, dl,
                                          PtrVT);
       FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
     }
   }
 
   if (!MemOps.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOps);
 
   return Chain;
 }
 
 // PPC64 passes i8, i16, and i32 values in i64 registers. Promote
 // value to MVT::i64 and then truncate to the correct register size.
 SDValue PPCTargetLowering::extendArgForPPC64(ISD::ArgFlagsTy Flags,
                                              EVT ObjectVT, SelectionDAG &DAG,
                                              SDValue ArgVal,
                                              const SDLoc &dl) const {
   if (Flags.isSExt())
     ArgVal = DAG.getNode(ISD::AssertSext, dl, MVT::i64, ArgVal,
                          DAG.getValueType(ObjectVT));
   else if (Flags.isZExt())
     ArgVal = DAG.getNode(ISD::AssertZext, dl, MVT::i64, ArgVal,
                          DAG.getValueType(ObjectVT));
 
   return DAG.getNode(ISD::TRUNCATE, dl, ObjectVT, ArgVal);
 }
 
 SDValue PPCTargetLowering::LowerFormalArguments_64SVR4(
     SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
   // TODO: add description of PPC stack frame format, or at least some docs.
   //
   bool isELFv2ABI = Subtarget.isELFv2ABI();
   bool isLittleEndian = Subtarget.isLittleEndian();
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
 
   assert(!(CallConv == CallingConv::Fast && isVarArg) &&
          "fastcc not supported on varargs functions");
 
   EVT PtrVT = getPointerTy(MF.getDataLayout());
   // Potential tail calls could cause overwriting of argument stack slots.
   bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
                        (CallConv == CallingConv::Fast));
   unsigned PtrByteSize = 8;
   unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
 
   static const MCPhysReg GPR[] = {
     PPC::X3, PPC::X4, PPC::X5, PPC::X6,
     PPC::X7, PPC::X8, PPC::X9, PPC::X10,
   };
   static const MCPhysReg VR[] = {
     PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
     PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
   };
 
   const unsigned Num_GPR_Regs = array_lengthof(GPR);
   const unsigned Num_FPR_Regs = useSoftFloat() ? 0 : 13;
   const unsigned Num_VR_Regs  = array_lengthof(VR);
   const unsigned Num_QFPR_Regs = Num_FPR_Regs;
 
   // Do a first pass over the arguments to determine whether the ABI
   // guarantees that our caller has allocated the parameter save area
   // on its stack frame.  In the ELFv1 ABI, this is always the case;
   // in the ELFv2 ABI, it is true if this is a vararg function or if
   // any parameter is located in a stack slot.
 
   bool HasParameterArea = !isELFv2ABI || isVarArg;
   unsigned ParamAreaSize = Num_GPR_Regs * PtrByteSize;
   unsigned NumBytes = LinkageSize;
   unsigned AvailableFPRs = Num_FPR_Regs;
   unsigned AvailableVRs = Num_VR_Regs;
   for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
     if (Ins[i].Flags.isNest())
       continue;
 
     if (CalculateStackSlotUsed(Ins[i].VT, Ins[i].ArgVT, Ins[i].Flags,
                                PtrByteSize, LinkageSize, ParamAreaSize,
                                NumBytes, AvailableFPRs, AvailableVRs,
                                Subtarget.hasQPX()))
       HasParameterArea = true;
   }
 
   // Add DAG nodes to load the arguments or copy them out of registers.  On
   // entry to a function on PPC, the arguments start after the linkage area,
   // although the first ones are often in registers.
 
   unsigned ArgOffset = LinkageSize;
   unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
   unsigned &QFPR_idx = FPR_idx;
   SmallVector<SDValue, 8> MemOps;
   Function::const_arg_iterator FuncArg = MF.getFunction().arg_begin();
   unsigned CurArgIdx = 0;
   for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
     SDValue ArgVal;
     bool needsLoad = false;
     EVT ObjectVT = Ins[ArgNo].VT;
     EVT OrigVT = Ins[ArgNo].ArgVT;
     unsigned ObjSize = ObjectVT.getStoreSize();
     unsigned ArgSize = ObjSize;
     ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
     if (Ins[ArgNo].isOrigArg()) {
       std::advance(FuncArg, Ins[ArgNo].getOrigArgIndex() - CurArgIdx);
       CurArgIdx = Ins[ArgNo].getOrigArgIndex();
     }
     // We re-align the argument offset for each argument, except when using the
     // fast calling convention, when we need to make sure we do that only when
     // we'll actually use a stack slot.
     unsigned CurArgOffset, Align;
     auto ComputeArgOffset = [&]() {
       /* Respect alignment of argument on the stack.  */
       Align = CalculateStackSlotAlignment(ObjectVT, OrigVT, Flags, PtrByteSize);
       ArgOffset = ((ArgOffset + Align - 1) / Align) * Align;
       CurArgOffset = ArgOffset;
     };
 
     if (CallConv != CallingConv::Fast) {
       ComputeArgOffset();
 
       /* Compute GPR index associated with argument offset.  */
       GPR_idx = (ArgOffset - LinkageSize) / PtrByteSize;
       GPR_idx = std::min(GPR_idx, Num_GPR_Regs);
     }
 
     // FIXME the codegen can be much improved in some cases.
     // We do not have to keep everything in memory.
     if (Flags.isByVal()) {
       assert(Ins[ArgNo].isOrigArg() && "Byval arguments cannot be implicit");
 
       if (CallConv == CallingConv::Fast)
         ComputeArgOffset();
 
       // ObjSize is the true size, ArgSize rounded up to multiple of registers.
       ObjSize = Flags.getByValSize();
       ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
       // Empty aggregate parameters do not take up registers.  Examples:
       //   struct { } a;
       //   union  { } b;
       //   int c[0];
       // etc.  However, we have to provide a place-holder in InVals, so
       // pretend we have an 8-byte item at the current address for that
       // purpose.
       if (!ObjSize) {
         int FI = MFI.CreateFixedObject(PtrByteSize, ArgOffset, true);
         SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
         InVals.push_back(FIN);
         continue;
       }
 
       // Create a stack object covering all stack doublewords occupied
       // by the argument.  If the argument is (fully or partially) on
       // the stack, or if the argument is fully in registers but the
       // caller has allocated the parameter save anyway, we can refer
       // directly to the caller's stack frame.  Otherwise, create a
       // local copy in our own frame.
       int FI;
       if (HasParameterArea ||
           ArgSize + ArgOffset > LinkageSize + Num_GPR_Regs * PtrByteSize)
         FI = MFI.CreateFixedObject(ArgSize, ArgOffset, false, true);
       else
         FI = MFI.CreateStackObject(ArgSize, Align, false);
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
 
       // Handle aggregates smaller than 8 bytes.
       if (ObjSize < PtrByteSize) {
         // The value of the object is its address, which differs from the
         // address of the enclosing doubleword on big-endian systems.
         SDValue Arg = FIN;
         if (!isLittleEndian) {
           SDValue ArgOff = DAG.getConstant(PtrByteSize - ObjSize, dl, PtrVT);
           Arg = DAG.getNode(ISD::ADD, dl, ArgOff.getValueType(), Arg, ArgOff);
         }
         InVals.push_back(Arg);
 
         if (GPR_idx != Num_GPR_Regs) {
           unsigned VReg = MF.addLiveIn(GPR[GPR_idx++], &PPC::G8RCRegClass);
           FuncInfo->addLiveInAttr(VReg, Flags);
           SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
           SDValue Store;
 
           if (ObjSize==1 || ObjSize==2 || ObjSize==4) {
             EVT ObjType = (ObjSize == 1 ? MVT::i8 :
                            (ObjSize == 2 ? MVT::i16 : MVT::i32));
             Store = DAG.getTruncStore(Val.getValue(1), dl, Val, Arg,
                                       MachinePointerInfo(&*FuncArg), ObjType);
           } else {
             // For sizes that don't fit a truncating store (3, 5, 6, 7),
             // store the whole register as-is to the parameter save area
             // slot.
             Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
                                  MachinePointerInfo(&*FuncArg));
           }
 
           MemOps.push_back(Store);
         }
         // Whether we copied from a register or not, advance the offset
         // into the parameter save area by a full doubleword.
         ArgOffset += PtrByteSize;
         continue;
       }
 
       // The value of the object is its address, which is the address of
       // its first stack doubleword.
       InVals.push_back(FIN);
 
       // Store whatever pieces of the object are in registers to memory.
       for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
         if (GPR_idx == Num_GPR_Regs)
           break;
 
         unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
         FuncInfo->addLiveInAttr(VReg, Flags);
         SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
         SDValue Addr = FIN;
         if (j) {
           SDValue Off = DAG.getConstant(j, dl, PtrVT);
           Addr = DAG.getNode(ISD::ADD, dl, Off.getValueType(), Addr, Off);
         }
         SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, Addr,
                                      MachinePointerInfo(&*FuncArg, j));
         MemOps.push_back(Store);
         ++GPR_idx;
       }
       ArgOffset += ArgSize;
       continue;
     }
 
     switch (ObjectVT.getSimpleVT().SimpleTy) {
     default: llvm_unreachable("Unhandled argument type!");
     case MVT::i1:
     case MVT::i32:
     case MVT::i64:
       if (Flags.isNest()) {
         // The 'nest' parameter, if any, is passed in R11.
         unsigned VReg = MF.addLiveIn(PPC::X11, &PPC::G8RCRegClass);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
 
         if (ObjectVT == MVT::i32 || ObjectVT == MVT::i1)
           ArgVal = extendArgForPPC64(Flags, ObjectVT, DAG, ArgVal, dl);
 
         break;
       }
 
       // These can be scalar arguments or elements of an integer array type
       // passed directly.  Clang may use those instead of "byval" aggregate
       // types to avoid forcing arguments to memory unnecessarily.
       if (GPR_idx != Num_GPR_Regs) {
         unsigned VReg = MF.addLiveIn(GPR[GPR_idx++], &PPC::G8RCRegClass);
         FuncInfo->addLiveInAttr(VReg, Flags);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
 
         if (ObjectVT == MVT::i32 || ObjectVT == MVT::i1)
           // PPC64 passes i8, i16, and i32 values in i64 registers. Promote
           // value to MVT::i64 and then truncate to the correct register size.
           ArgVal = extendArgForPPC64(Flags, ObjectVT, DAG, ArgVal, dl);
       } else {
         if (CallConv == CallingConv::Fast)
           ComputeArgOffset();
 
         needsLoad = true;
         ArgSize = PtrByteSize;
       }
       if (CallConv != CallingConv::Fast || needsLoad)
         ArgOffset += 8;
       break;
 
     case MVT::f32:
     case MVT::f64:
       // These can be scalar arguments or elements of a float array type
       // passed directly.  The latter are used to implement ELFv2 homogenous
       // float aggregates.
       if (FPR_idx != Num_FPR_Regs) {
         unsigned VReg;
 
         if (ObjectVT == MVT::f32)
           VReg = MF.addLiveIn(FPR[FPR_idx],
                               Subtarget.hasP8Vector()
                                   ? &PPC::VSSRCRegClass
                                   : &PPC::F4RCRegClass);
         else
           VReg = MF.addLiveIn(FPR[FPR_idx], Subtarget.hasVSX()
                                                 ? &PPC::VSFRCRegClass
                                                 : &PPC::F8RCRegClass);
 
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
         ++FPR_idx;
       } else if (GPR_idx != Num_GPR_Regs && CallConv != CallingConv::Fast) {
         // FIXME: We may want to re-enable this for CallingConv::Fast on the P8
         // once we support fp <-> gpr moves.
 
         // This can only ever happen in the presence of f32 array types,
         // since otherwise we never run out of FPRs before running out
         // of GPRs.
         unsigned VReg = MF.addLiveIn(GPR[GPR_idx++], &PPC::G8RCRegClass);
         FuncInfo->addLiveInAttr(VReg, Flags);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
 
         if (ObjectVT == MVT::f32) {
           if ((ArgOffset % PtrByteSize) == (isLittleEndian ? 4 : 0))
             ArgVal = DAG.getNode(ISD::SRL, dl, MVT::i64, ArgVal,
                                  DAG.getConstant(32, dl, MVT::i32));
           ArgVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, ArgVal);
         }
 
         ArgVal = DAG.getNode(ISD::BITCAST, dl, ObjectVT, ArgVal);
       } else {
         if (CallConv == CallingConv::Fast)
           ComputeArgOffset();
 
         needsLoad = true;
       }
 
       // When passing an array of floats, the array occupies consecutive
       // space in the argument area; only round up to the next doubleword
       // at the end of the array.  Otherwise, each float takes 8 bytes.
       if (CallConv != CallingConv::Fast || needsLoad) {
         ArgSize = Flags.isInConsecutiveRegs() ? ObjSize : PtrByteSize;
         ArgOffset += ArgSize;
         if (Flags.isInConsecutiveRegsLast())
           ArgOffset = ((ArgOffset + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
       }
       break;
     case MVT::v4f32:
     case MVT::v4i32:
     case MVT::v8i16:
     case MVT::v16i8:
     case MVT::v2f64:
     case MVT::v2i64:
     case MVT::v1i128:
     case MVT::f128:
       if (!Subtarget.hasQPX()) {
         // These can be scalar arguments or elements of a vector array type
         // passed directly.  The latter are used to implement ELFv2 homogenous
         // vector aggregates.
         if (VR_idx != Num_VR_Regs) {
           unsigned VReg = MF.addLiveIn(VR[VR_idx], &PPC::VRRCRegClass);
           ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
           ++VR_idx;
         } else {
           if (CallConv == CallingConv::Fast)
             ComputeArgOffset();
           needsLoad = true;
         }
         if (CallConv != CallingConv::Fast || needsLoad)
           ArgOffset += 16;
         break;
       } // not QPX
 
       assert(ObjectVT.getSimpleVT().SimpleTy == MVT::v4f32 &&
              "Invalid QPX parameter type");
       LLVM_FALLTHROUGH;
 
     case MVT::v4f64:
     case MVT::v4i1:
       // QPX vectors are treated like their scalar floating-point subregisters
       // (except that they're larger).
       unsigned Sz = ObjectVT.getSimpleVT().SimpleTy == MVT::v4f32 ? 16 : 32;
       if (QFPR_idx != Num_QFPR_Regs) {
         const TargetRegisterClass *RC;
         switch (ObjectVT.getSimpleVT().SimpleTy) {
         case MVT::v4f64: RC = &PPC::QFRCRegClass; break;
         case MVT::v4f32: RC = &PPC::QSRCRegClass; break;
         default:         RC = &PPC::QBRCRegClass; break;
         }
 
         unsigned VReg = MF.addLiveIn(QFPR[QFPR_idx], RC);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
         ++QFPR_idx;
       } else {
         if (CallConv == CallingConv::Fast)
           ComputeArgOffset();
         needsLoad = true;
       }
       if (CallConv != CallingConv::Fast || needsLoad)
         ArgOffset += Sz;
       break;
     }
 
     // We need to load the argument to a virtual register if we determined
     // above that we ran out of physical registers of the appropriate type.
     if (needsLoad) {
       if (ObjSize < ArgSize && !isLittleEndian)
         CurArgOffset += ArgSize - ObjSize;
       int FI = MFI.CreateFixedObject(ObjSize, CurArgOffset, isImmutable);
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
       ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo());
     }
 
     InVals.push_back(ArgVal);
   }
 
   // Area that is at least reserved in the caller of this function.
   unsigned MinReservedArea;
   if (HasParameterArea)
     MinReservedArea = std::max(ArgOffset, LinkageSize + 8 * PtrByteSize);
   else
     MinReservedArea = LinkageSize;
 
   // Set the size that is at least reserved in caller of this function.  Tail
   // call optimized functions' reserved stack space needs to be aligned so that
   // taking the difference between two stack areas will result in an aligned
   // stack.
   MinReservedArea =
       EnsureStackAlignment(Subtarget.getFrameLowering(), MinReservedArea);
   FuncInfo->setMinReservedArea(MinReservedArea);
 
   // If the function takes variable number of arguments, make a frame index for
   // the start of the first vararg value... for expansion of llvm.va_start.
   if (isVarArg) {
     int Depth = ArgOffset;
 
     FuncInfo->setVarArgsFrameIndex(
       MFI.CreateFixedObject(PtrByteSize, Depth, true));
     SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
 
     // If this function is vararg, store any remaining integer argument regs
     // to their spots on the stack so that they may be loaded by dereferencing
     // the result of va_next.
     for (GPR_idx = (ArgOffset - LinkageSize) / PtrByteSize;
          GPR_idx < Num_GPR_Regs; ++GPR_idx) {
       unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
       SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
       SDValue Store =
           DAG.getStore(Val.getValue(1), dl, Val, FIN, MachinePointerInfo());
       MemOps.push_back(Store);
       // Increment the address by four for the next argument to store
       SDValue PtrOff = DAG.getConstant(PtrByteSize, dl, PtrVT);
       FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
     }
   }
 
   if (!MemOps.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOps);
 
   return Chain;
 }
 
 SDValue PPCTargetLowering::LowerFormalArguments_Darwin(
     SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
   // TODO: add description of PPC stack frame format, or at least some docs.
   //
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
 
   EVT PtrVT = getPointerTy(MF.getDataLayout());
   bool isPPC64 = PtrVT == MVT::i64;
   // Potential tail calls could cause overwriting of argument stack slots.
   bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
                        (CallConv == CallingConv::Fast));
   unsigned PtrByteSize = isPPC64 ? 8 : 4;
   unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   unsigned ArgOffset = LinkageSize;
   // Area that is at least reserved in caller of this function.
   unsigned MinReservedArea = ArgOffset;
 
   static const MCPhysReg GPR_32[] = {           // 32-bit registers.
     PPC::R3, PPC::R4, PPC::R5, PPC::R6,
     PPC::R7, PPC::R8, PPC::R9, PPC::R10,
   };
   static const MCPhysReg GPR_64[] = {           // 64-bit registers.
     PPC::X3, PPC::X4, PPC::X5, PPC::X6,
     PPC::X7, PPC::X8, PPC::X9, PPC::X10,
   };
   static const MCPhysReg VR[] = {
     PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
     PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
   };
 
   const unsigned Num_GPR_Regs = array_lengthof(GPR_32);
   const unsigned Num_FPR_Regs = useSoftFloat() ? 0 : 13;
   const unsigned Num_VR_Regs  = array_lengthof( VR);
 
   unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
 
   const MCPhysReg *GPR = isPPC64 ? GPR_64 : GPR_32;
 
   // In 32-bit non-varargs functions, the stack space for vectors is after the
   // stack space for non-vectors.  We do not use this space unless we have
   // too many vectors to fit in registers, something that only occurs in
   // constructed examples:), but we have to walk the arglist to figure
   // that out...for the pathological case, compute VecArgOffset as the
   // start of the vector parameter area.  Computing VecArgOffset is the
   // entire point of the following loop.
   unsigned VecArgOffset = ArgOffset;
   if (!isVarArg && !isPPC64) {
     for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e;
          ++ArgNo) {
       EVT ObjectVT = Ins[ArgNo].VT;
       ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
 
       if (Flags.isByVal()) {
         // ObjSize is the true size, ArgSize rounded up to multiple of regs.
         unsigned ObjSize = Flags.getByValSize();
         unsigned ArgSize =
                 ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
         VecArgOffset += ArgSize;
         continue;
       }
 
       switch(ObjectVT.getSimpleVT().SimpleTy) {
       default: llvm_unreachable("Unhandled argument type!");
       case MVT::i1:
       case MVT::i32:
       case MVT::f32:
         VecArgOffset += 4;
         break;
       case MVT::i64:  // PPC64
       case MVT::f64:
         // FIXME: We are guaranteed to be !isPPC64 at this point.
         // Does MVT::i64 apply?
         VecArgOffset += 8;
         break;
       case MVT::v4f32:
       case MVT::v4i32:
       case MVT::v8i16:
       case MVT::v16i8:
         // Nothing to do, we're only looking at Nonvector args here.
         break;
       }
     }
   }
   // We've found where the vector parameter area in memory is.  Skip the
   // first 12 parameters; these don't use that memory.
   VecArgOffset = ((VecArgOffset+15)/16)*16;
   VecArgOffset += 12*16;
 
   // Add DAG nodes to load the arguments or copy them out of registers.  On
   // entry to a function on PPC, the arguments start after the linkage area,
   // although the first ones are often in registers.
 
   SmallVector<SDValue, 8> MemOps;
   unsigned nAltivecParamsAtEnd = 0;
   Function::const_arg_iterator FuncArg = MF.getFunction().arg_begin();
   unsigned CurArgIdx = 0;
   for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
     SDValue ArgVal;
     bool needsLoad = false;
     EVT ObjectVT = Ins[ArgNo].VT;
     unsigned ObjSize = ObjectVT.getSizeInBits()/8;
     unsigned ArgSize = ObjSize;
     ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
     if (Ins[ArgNo].isOrigArg()) {
       std::advance(FuncArg, Ins[ArgNo].getOrigArgIndex() - CurArgIdx);
       CurArgIdx = Ins[ArgNo].getOrigArgIndex();
     }
     unsigned CurArgOffset = ArgOffset;
 
     // Varargs or 64 bit Altivec parameters are padded to a 16 byte boundary.
     if (ObjectVT==MVT::v4f32 || ObjectVT==MVT::v4i32 ||
         ObjectVT==MVT::v8i16 || ObjectVT==MVT::v16i8) {
       if (isVarArg || isPPC64) {
         MinReservedArea = ((MinReservedArea+15)/16)*16;
         MinReservedArea += CalculateStackSlotSize(ObjectVT,
                                                   Flags,
                                                   PtrByteSize);
       } else  nAltivecParamsAtEnd++;
     } else
       // Calculate min reserved area.
       MinReservedArea += CalculateStackSlotSize(Ins[ArgNo].VT,
                                                 Flags,
                                                 PtrByteSize);
 
     // FIXME the codegen can be much improved in some cases.
     // We do not have to keep everything in memory.
     if (Flags.isByVal()) {
       assert(Ins[ArgNo].isOrigArg() && "Byval arguments cannot be implicit");
 
       // ObjSize is the true size, ArgSize rounded up to multiple of registers.
       ObjSize = Flags.getByValSize();
       ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
       // Objects of size 1 and 2 are right justified, everything else is
       // left justified.  This means the memory address is adjusted forwards.
       if (ObjSize==1 || ObjSize==2) {
         CurArgOffset = CurArgOffset + (4 - ObjSize);
       }
       // The value of the object is its address.
       int FI = MFI.CreateFixedObject(ObjSize, CurArgOffset, false, true);
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
       InVals.push_back(FIN);
       if (ObjSize==1 || ObjSize==2) {
         if (GPR_idx != Num_GPR_Regs) {
           unsigned VReg;
           if (isPPC64)
             VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
           else
             VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
           SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
           EVT ObjType = ObjSize == 1 ? MVT::i8 : MVT::i16;
           SDValue Store =
               DAG.getTruncStore(Val.getValue(1), dl, Val, FIN,
                                 MachinePointerInfo(&*FuncArg), ObjType);
           MemOps.push_back(Store);
           ++GPR_idx;
         }
 
         ArgOffset += PtrByteSize;
 
         continue;
       }
       for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
         // Store whatever pieces of the object are in registers
         // to memory.  ArgOffset will be the address of the beginning
         // of the object.
         if (GPR_idx != Num_GPR_Regs) {
           unsigned VReg;
           if (isPPC64)
             VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
           else
             VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
           int FI = MFI.CreateFixedObject(PtrByteSize, ArgOffset, true);
           SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
           SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
           SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
                                        MachinePointerInfo(&*FuncArg, j));
           MemOps.push_back(Store);
           ++GPR_idx;
           ArgOffset += PtrByteSize;
         } else {
           ArgOffset += ArgSize - (ArgOffset-CurArgOffset);
           break;
         }
       }
       continue;
     }
 
     switch (ObjectVT.getSimpleVT().SimpleTy) {
     default: llvm_unreachable("Unhandled argument type!");
     case MVT::i1:
     case MVT::i32:
       if (!isPPC64) {
         if (GPR_idx != Num_GPR_Regs) {
           unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
           ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
 
           if (ObjectVT == MVT::i1)
             ArgVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, ArgVal);
 
           ++GPR_idx;
         } else {
           needsLoad = true;
           ArgSize = PtrByteSize;
         }
         // All int arguments reserve stack space in the Darwin ABI.
         ArgOffset += PtrByteSize;
         break;
       }
       LLVM_FALLTHROUGH;
     case MVT::i64:  // PPC64
       if (GPR_idx != Num_GPR_Regs) {
         unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
 
         if (ObjectVT == MVT::i32 || ObjectVT == MVT::i1)
           // PPC64 passes i8, i16, and i32 values in i64 registers. Promote
           // value to MVT::i64 and then truncate to the correct register size.
           ArgVal = extendArgForPPC64(Flags, ObjectVT, DAG, ArgVal, dl);
 
         ++GPR_idx;
       } else {
         needsLoad = true;
         ArgSize = PtrByteSize;
       }
       // All int arguments reserve stack space in the Darwin ABI.
       ArgOffset += 8;
       break;
 
     case MVT::f32:
     case MVT::f64:
       // Every 4 bytes of argument space consumes one of the GPRs available for
       // argument passing.
       if (GPR_idx != Num_GPR_Regs) {
         ++GPR_idx;
         if (ObjSize == 8 && GPR_idx != Num_GPR_Regs && !isPPC64)
           ++GPR_idx;
       }
       if (FPR_idx != Num_FPR_Regs) {
         unsigned VReg;
 
         if (ObjectVT == MVT::f32)
           VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F4RCRegClass);
         else
           VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F8RCRegClass);
 
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
         ++FPR_idx;
       } else {
         needsLoad = true;
       }
 
       // All FP arguments reserve stack space in the Darwin ABI.
       ArgOffset += isPPC64 ? 8 : ObjSize;
       break;
     case MVT::v4f32:
     case MVT::v4i32:
     case MVT::v8i16:
     case MVT::v16i8:
       // Note that vector arguments in registers don't reserve stack space,
       // except in varargs functions.
       if (VR_idx != Num_VR_Regs) {
         unsigned VReg = MF.addLiveIn(VR[VR_idx], &PPC::VRRCRegClass);
         ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
         if (isVarArg) {
           while ((ArgOffset % 16) != 0) {
             ArgOffset += PtrByteSize;
             if (GPR_idx != Num_GPR_Regs)
               GPR_idx++;
           }
           ArgOffset += 16;
           GPR_idx = std::min(GPR_idx+4, Num_GPR_Regs); // FIXME correct for ppc64?
         }
         ++VR_idx;
       } else {
         if (!isVarArg && !isPPC64) {
           // Vectors go after all the nonvectors.
           CurArgOffset = VecArgOffset;
           VecArgOffset += 16;
         } else {
           // Vectors are aligned.
           ArgOffset = ((ArgOffset+15)/16)*16;
           CurArgOffset = ArgOffset;
           ArgOffset += 16;
         }
         needsLoad = true;
       }
       break;
     }
 
     // We need to load the argument to a virtual register if we determined above
     // that we ran out of physical registers of the appropriate type.
     if (needsLoad) {
       int FI = MFI.CreateFixedObject(ObjSize,
                                      CurArgOffset + (ArgSize - ObjSize),
                                      isImmutable);
       SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
       ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo());
     }
 
     InVals.push_back(ArgVal);
   }
 
   // Allow for Altivec parameters at the end, if needed.
   if (nAltivecParamsAtEnd) {
     MinReservedArea = ((MinReservedArea+15)/16)*16;
     MinReservedArea += 16*nAltivecParamsAtEnd;
   }
 
   // Area that is at least reserved in the caller of this function.
   MinReservedArea = std::max(MinReservedArea, LinkageSize + 8 * PtrByteSize);
 
   // Set the size that is at least reserved in caller of this function.  Tail
   // call optimized functions' reserved stack space needs to be aligned so that
   // taking the difference between two stack areas will result in an aligned
   // stack.
   MinReservedArea =
       EnsureStackAlignment(Subtarget.getFrameLowering(), MinReservedArea);
   FuncInfo->setMinReservedArea(MinReservedArea);
 
   // If the function takes variable number of arguments, make a frame index for
   // the start of the first vararg value... for expansion of llvm.va_start.
   if (isVarArg) {
     int Depth = ArgOffset;
 
     FuncInfo->setVarArgsFrameIndex(
       MFI.CreateFixedObject(PtrVT.getSizeInBits()/8,
                             Depth, true));
     SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
 
     // If this function is vararg, store any remaining integer argument regs
     // to their spots on the stack so that they may be loaded by dereferencing
     // the result of va_next.
     for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
       unsigned VReg;
 
       if (isPPC64)
         VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
       else
         VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
 
       SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
       SDValue Store =
           DAG.getStore(Val.getValue(1), dl, Val, FIN, MachinePointerInfo());
       MemOps.push_back(Store);
       // Increment the address by four for the next argument to store
       SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, dl, PtrVT);
       FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
     }
   }
 
   if (!MemOps.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOps);
 
   return Chain;
 }
 
 /// CalculateTailCallSPDiff - Get the amount the stack pointer has to be
 /// adjusted to accommodate the arguments for the tailcall.
 static int CalculateTailCallSPDiff(SelectionDAG& DAG, bool isTailCall,
                                    unsigned ParamSize) {
 
   if (!isTailCall) return 0;
 
   PPCFunctionInfo *FI = DAG.getMachineFunction().getInfo<PPCFunctionInfo>();
   unsigned CallerMinReservedArea = FI->getMinReservedArea();
   int SPDiff = (int)CallerMinReservedArea - (int)ParamSize;
   // Remember only if the new adjustment is bigger.
   if (SPDiff < FI->getTailCallSPDelta())
     FI->setTailCallSPDelta(SPDiff);
 
   return SPDiff;
 }
 
 static bool isFunctionGlobalAddress(SDValue Callee);
 
 static bool
 callsShareTOCBase(const Function *Caller, SDValue Callee,
                     const TargetMachine &TM) {
    // Callee is either a GlobalAddress or an ExternalSymbol. ExternalSymbols
    // don't have enough information to determine if the caller and calle share
    // the same  TOC base, so we have to pessimistically assume they don't for
    // correctness.
    GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
    if (!G)
      return false;
 
    const GlobalValue *GV = G->getGlobal();
   // The medium and large code models are expected to provide a sufficiently
   // large TOC to provide all data addressing needs of a module with a
   // single TOC. Since each module will be addressed with a single TOC then we
   // only need to check that caller and callee don't cross dso boundaries.
   if (CodeModel::Medium == TM.getCodeModel() ||
       CodeModel::Large == TM.getCodeModel())
     return TM.shouldAssumeDSOLocal(*Caller->getParent(), GV);
 
   // Otherwise we need to ensure callee and caller are in the same section,
   // since the linker may allocate multiple TOCs, and we don't know which
   // sections will belong to the same TOC base.
 
   if (!GV->isStrongDefinitionForLinker())
     return false;
 
   // Any explicitly-specified sections and section prefixes must also match.
   // Also, if we're using -ffunction-sections, then each function is always in
   // a different section (the same is true for COMDAT functions).
   if (TM.getFunctionSections() || GV->hasComdat() || Caller->hasComdat() ||
       GV->getSection() != Caller->getSection())
     return false;
   if (const auto *F = dyn_cast<Function>(GV)) {
     if (F->getSectionPrefix() != Caller->getSectionPrefix())
       return false;
   }
 
   // If the callee might be interposed, then we can't assume the ultimate call
   // target will be in the same section. Even in cases where we can assume that
   // interposition won't happen, in any case where the linker might insert a
   // stub to allow for interposition, we must generate code as though
   // interposition might occur. To understand why this matters, consider a
   // situation where: a -> b -> c where the arrows indicate calls. b and c are
   // in the same section, but a is in a different module (i.e. has a different
   // TOC base pointer). If the linker allows for interposition between b and c,
   // then it will generate a stub for the call edge between b and c which will
   // save the TOC pointer into the designated stack slot allocated by b. If we
   // return true here, and therefore allow a tail call between b and c, that
   // stack slot won't exist and the b -> c stub will end up saving b'c TOC base
   // pointer into the stack slot allocated by a (where the a -> b stub saved
   // a's TOC base pointer). If we're not considering a tail call, but rather,
   // whether a nop is needed after the call instruction in b, because the linker
   // will insert a stub, it might complain about a missing nop if we omit it
   // (although many don't complain in this case).
   if (!TM.shouldAssumeDSOLocal(*Caller->getParent(), GV))
     return false;
 
   return true;
 }
 
 static bool
 needStackSlotPassParameters(const PPCSubtarget &Subtarget,
                             const SmallVectorImpl<ISD::OutputArg> &Outs) {
   assert(Subtarget.is64BitELFABI());
 
   const unsigned PtrByteSize = 8;
   const unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
 
   static const MCPhysReg GPR[] = {
     PPC::X3, PPC::X4, PPC::X5, PPC::X6,
     PPC::X7, PPC::X8, PPC::X9, PPC::X10,
   };
   static const MCPhysReg VR[] = {
     PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
     PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
   };
 
   const unsigned NumGPRs = array_lengthof(GPR);
   const unsigned NumFPRs = 13;
   const unsigned NumVRs = array_lengthof(VR);
   const unsigned ParamAreaSize = NumGPRs * PtrByteSize;
 
   unsigned NumBytes = LinkageSize;
   unsigned AvailableFPRs = NumFPRs;
   unsigned AvailableVRs = NumVRs;
 
   for (const ISD::OutputArg& Param : Outs) {
     if (Param.Flags.isNest()) continue;
 
     if (CalculateStackSlotUsed(Param.VT, Param.ArgVT, Param.Flags,
                                PtrByteSize, LinkageSize, ParamAreaSize,
                                NumBytes, AvailableFPRs, AvailableVRs,
                                Subtarget.hasQPX()))
       return true;
   }
   return false;
 }
 
 static bool
 hasSameArgumentList(const Function *CallerFn, ImmutableCallSite CS) {
   if (CS.arg_size() != CallerFn->arg_size())
     return false;
 
   ImmutableCallSite::arg_iterator CalleeArgIter = CS.arg_begin();
   ImmutableCallSite::arg_iterator CalleeArgEnd = CS.arg_end();
   Function::const_arg_iterator CallerArgIter = CallerFn->arg_begin();
 
   for (; CalleeArgIter != CalleeArgEnd; ++CalleeArgIter, ++CallerArgIter) {
     const Value* CalleeArg = *CalleeArgIter;
     const Value* CallerArg = &(*CallerArgIter);
     if (CalleeArg == CallerArg)
       continue;
 
     // e.g. @caller([4 x i64] %a, [4 x i64] %b) {
     //        tail call @callee([4 x i64] undef, [4 x i64] %b)
     //      }
     // 1st argument of callee is undef and has the same type as caller.
     if (CalleeArg->getType() == CallerArg->getType() &&
         isa<UndefValue>(CalleeArg))
       continue;
 
     return false;
   }
 
   return true;
 }
 
 // Returns true if TCO is possible between the callers and callees
 // calling conventions.
 static bool
 areCallingConvEligibleForTCO_64SVR4(CallingConv::ID CallerCC,
                                     CallingConv::ID CalleeCC) {
   // Tail calls are possible with fastcc and ccc.
   auto isTailCallableCC  = [] (CallingConv::ID CC){
       return  CC == CallingConv::C || CC == CallingConv::Fast;
   };
   if (!isTailCallableCC(CallerCC) || !isTailCallableCC(CalleeCC))
     return false;
 
   // We can safely tail call both fastcc and ccc callees from a c calling
   // convention caller. If the caller is fastcc, we may have less stack space
   // than a non-fastcc caller with the same signature so disable tail-calls in
   // that case.
   return CallerCC == CallingConv::C || CallerCC == CalleeCC;
 }
 
 bool
 PPCTargetLowering::IsEligibleForTailCallOptimization_64SVR4(
                                     SDValue Callee,
                                     CallingConv::ID CalleeCC,
                                     ImmutableCallSite CS,
                                     bool isVarArg,
                                     const SmallVectorImpl<ISD::OutputArg> &Outs,
                                     const SmallVectorImpl<ISD::InputArg> &Ins,
                                     SelectionDAG& DAG) const {
   bool TailCallOpt = getTargetMachine().Options.GuaranteedTailCallOpt;
 
   if (DisableSCO && !TailCallOpt) return false;
 
   // Variadic argument functions are not supported.
   if (isVarArg) return false;
 
   auto &Caller = DAG.getMachineFunction().getFunction();
   // Check that the calling conventions are compatible for tco.
   if (!areCallingConvEligibleForTCO_64SVR4(Caller.getCallingConv(), CalleeCC))
     return false;
 
   // Caller contains any byval parameter is not supported.
   if (any_of(Ins, [](const ISD::InputArg &IA) { return IA.Flags.isByVal(); }))
     return false;
 
   // Callee contains any byval parameter is not supported, too.
   // Note: This is a quick work around, because in some cases, e.g.
   // caller's stack size > callee's stack size, we are still able to apply
   // sibling call optimization. For example, gcc is able to do SCO for caller1
   // in the following example, but not for caller2.
   //   struct test {
   //     long int a;
   //     char ary[56];
   //   } gTest;
   //   __attribute__((noinline)) int callee(struct test v, struct test *b) {
   //     b->a = v.a;
   //     return 0;
   //   }
   //   void caller1(struct test a, struct test c, struct test *b) {
   //     callee(gTest, b); }
   //   void caller2(struct test *b) { callee(gTest, b); }
   if (any_of(Outs, [](const ISD::OutputArg& OA) { return OA.Flags.isByVal(); }))
     return false;
 
   // If callee and caller use different calling conventions, we cannot pass
   // parameters on stack since offsets for the parameter area may be different.
   if (Caller.getCallingConv() != CalleeCC &&
       needStackSlotPassParameters(Subtarget, Outs))
     return false;
 
   // No TCO/SCO on indirect call because Caller have to restore its TOC
   if (!isFunctionGlobalAddress(Callee) &&
       !isa<ExternalSymbolSDNode>(Callee))
     return false;
 
   // If the caller and callee potentially have different TOC bases then we
   // cannot tail call since we need to restore the TOC pointer after the call.
   // ref: https://bugzilla.mozilla.org/show_bug.cgi?id=973977
   if (!callsShareTOCBase(&Caller, Callee, getTargetMachine()))
     return false;
 
   // TCO allows altering callee ABI, so we don't have to check further.
   if (CalleeCC == CallingConv::Fast && TailCallOpt)
     return true;
 
   if (DisableSCO) return false;
 
   // If callee use the same argument list that caller is using, then we can
   // apply SCO on this case. If it is not, then we need to check if callee needs
   // stack for passing arguments.
   if (!hasSameArgumentList(&Caller, CS) &&
       needStackSlotPassParameters(Subtarget, Outs)) {
     return false;
   }
 
   return true;
 }
 
 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
 /// for tail call optimization. Targets which want to do tail call
 /// optimization should implement this function.
 bool
 PPCTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
                                                      CallingConv::ID CalleeCC,
                                                      bool isVarArg,
                                       const SmallVectorImpl<ISD::InputArg> &Ins,
                                                      SelectionDAG& DAG) const {
   if (!getTargetMachine().Options.GuaranteedTailCallOpt)
     return false;
 
   // Variable argument functions are not supported.
   if (isVarArg)
     return false;
 
   MachineFunction &MF = DAG.getMachineFunction();
   CallingConv::ID CallerCC = MF.getFunction().getCallingConv();
   if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
     // Functions containing by val parameters are not supported.
     for (unsigned i = 0; i != Ins.size(); i++) {
        ISD::ArgFlagsTy Flags = Ins[i].Flags;
        if (Flags.isByVal()) return false;
     }
 
     // Non-PIC/GOT tail calls are supported.
     if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
       return true;
 
     // At the moment we can only do local tail calls (in same module, hidden
     // or protected) if we are generating PIC.
     if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
       return G->getGlobal()->hasHiddenVisibility()
           || G->getGlobal()->hasProtectedVisibility();
   }
 
   return false;
 }
 
 /// isCallCompatibleAddress - Return the immediate to use if the specified
 /// 32-bit value is representable in the immediate field of a BxA instruction.
 static SDNode *isBLACompatibleAddress(SDValue Op, SelectionDAG &DAG) {
   ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
   if (!C) return nullptr;
 
   int Addr = C->getZExtValue();
   if ((Addr & 3) != 0 ||  // Low 2 bits are implicitly zero.
       SignExtend32<26>(Addr) != Addr)
     return nullptr;  // Top 6 bits have to be sext of immediate.
 
   return DAG
       .getConstant(
           (int)C->getZExtValue() >> 2, SDLoc(Op),
           DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout()))
       .getNode();
 }
 
 namespace {
 
 struct TailCallArgumentInfo {
   SDValue Arg;
   SDValue FrameIdxOp;
   int FrameIdx = 0;
 
   TailCallArgumentInfo() = default;
 };
 
 } // end anonymous namespace
 
 /// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot.
 static void StoreTailCallArgumentsToStackSlot(
     SelectionDAG &DAG, SDValue Chain,
     const SmallVectorImpl<TailCallArgumentInfo> &TailCallArgs,
     SmallVectorImpl<SDValue> &MemOpChains, const SDLoc &dl) {
   for (unsigned i = 0, e = TailCallArgs.size(); i != e; ++i) {
     SDValue Arg = TailCallArgs[i].Arg;
     SDValue FIN = TailCallArgs[i].FrameIdxOp;
     int FI = TailCallArgs[i].FrameIdx;
     // Store relative to framepointer.
     MemOpChains.push_back(DAG.getStore(
         Chain, dl, Arg, FIN,
         MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI)));
   }
 }
 
 /// EmitTailCallStoreFPAndRetAddr - Move the frame pointer and return address to
 /// the appropriate stack slot for the tail call optimized function call.
 static SDValue EmitTailCallStoreFPAndRetAddr(SelectionDAG &DAG, SDValue Chain,
                                              SDValue OldRetAddr, SDValue OldFP,
                                              int SPDiff, const SDLoc &dl) {
   if (SPDiff) {
     // Calculate the new stack slot for the return address.
     MachineFunction &MF = DAG.getMachineFunction();
     const PPCSubtarget &Subtarget = MF.getSubtarget<PPCSubtarget>();
     const PPCFrameLowering *FL = Subtarget.getFrameLowering();
     bool isPPC64 = Subtarget.isPPC64();
     int SlotSize = isPPC64 ? 8 : 4;
     int NewRetAddrLoc = SPDiff + FL->getReturnSaveOffset();
     int NewRetAddr = MF.getFrameInfo().CreateFixedObject(SlotSize,
                                                          NewRetAddrLoc, true);
     EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
     SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewRetAddr, VT);
     Chain = DAG.getStore(Chain, dl, OldRetAddr, NewRetAddrFrIdx,
                          MachinePointerInfo::getFixedStack(MF, NewRetAddr));
 
     // When using the 32/64-bit SVR4 ABI there is no need to move the FP stack
     // slot as the FP is never overwritten.
     if (Subtarget.isDarwinABI()) {
       int NewFPLoc = SPDiff + FL->getFramePointerSaveOffset();
       int NewFPIdx = MF.getFrameInfo().CreateFixedObject(SlotSize, NewFPLoc,
                                                          true);
       SDValue NewFramePtrIdx = DAG.getFrameIndex(NewFPIdx, VT);
       Chain = DAG.getStore(Chain, dl, OldFP, NewFramePtrIdx,
                            MachinePointerInfo::getFixedStack(
                                DAG.getMachineFunction(), NewFPIdx));
     }
   }
   return Chain;
 }
 
 /// CalculateTailCallArgDest - Remember Argument for later processing. Calculate
 /// the position of the argument.
 static void
 CalculateTailCallArgDest(SelectionDAG &DAG, MachineFunction &MF, bool isPPC64,
                          SDValue Arg, int SPDiff, unsigned ArgOffset,
                      SmallVectorImpl<TailCallArgumentInfo>& TailCallArguments) {
   int Offset = ArgOffset + SPDiff;
   uint32_t OpSize = (Arg.getValueSizeInBits() + 7) / 8;
   int FI = MF.getFrameInfo().CreateFixedObject(OpSize, Offset, true);
   EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
   SDValue FIN = DAG.getFrameIndex(FI, VT);
   TailCallArgumentInfo Info;
   Info.Arg = Arg;
   Info.FrameIdxOp = FIN;
   Info.FrameIdx = FI;
   TailCallArguments.push_back(Info);
 }
 
 /// EmitTCFPAndRetAddrLoad - Emit load from frame pointer and return address
 /// stack slot. Returns the chain as result and the loaded frame pointers in
 /// LROpOut/FPOpout. Used when tail calling.
 SDValue PPCTargetLowering::EmitTailCallLoadFPAndRetAddr(
     SelectionDAG &DAG, int SPDiff, SDValue Chain, SDValue &LROpOut,
     SDValue &FPOpOut, const SDLoc &dl) const {
   if (SPDiff) {
     // Load the LR and FP stack slot for later adjusting.
     EVT VT = Subtarget.isPPC64() ? MVT::i64 : MVT::i32;
     LROpOut = getReturnAddrFrameIndex(DAG);
     LROpOut = DAG.getLoad(VT, dl, Chain, LROpOut, MachinePointerInfo());
     Chain = SDValue(LROpOut.getNode(), 1);
 
     // When using the 32/64-bit SVR4 ABI there is no need to load the FP stack
     // slot as the FP is never overwritten.
     if (Subtarget.isDarwinABI()) {
       FPOpOut = getFramePointerFrameIndex(DAG);
       FPOpOut = DAG.getLoad(VT, dl, Chain, FPOpOut, MachinePointerInfo());
       Chain = SDValue(FPOpOut.getNode(), 1);
     }
   }
   return Chain;
 }
 
 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
 /// by "Src" to address "Dst" of size "Size".  Alignment information is
 /// specified by the specific parameter attribute. The copy will be passed as
 /// a byval function parameter.
 /// Sometimes what we are copying is the end of a larger object, the part that
 /// does not fit in registers.
 static SDValue CreateCopyOfByValArgument(SDValue Src, SDValue Dst,
                                          SDValue Chain, ISD::ArgFlagsTy Flags,
                                          SelectionDAG &DAG, const SDLoc &dl) {
   SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i32);
   return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
                        false, false, false, MachinePointerInfo(),
                        MachinePointerInfo());
 }
 
 /// LowerMemOpCallTo - Store the argument to the stack or remember it in case of
 /// tail calls.
 static void LowerMemOpCallTo(
     SelectionDAG &DAG, MachineFunction &MF, SDValue Chain, SDValue Arg,
     SDValue PtrOff, int SPDiff, unsigned ArgOffset, bool isPPC64,
     bool isTailCall, bool isVector, SmallVectorImpl<SDValue> &MemOpChains,
     SmallVectorImpl<TailCallArgumentInfo> &TailCallArguments, const SDLoc &dl) {
   EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout());
   if (!isTailCall) {
     if (isVector) {
       SDValue StackPtr;
       if (isPPC64)
         StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
       else
         StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
       PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
                            DAG.getConstant(ArgOffset, dl, PtrVT));
     }
     MemOpChains.push_back(
         DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo()));
     // Calculate and remember argument location.
   } else CalculateTailCallArgDest(DAG, MF, isPPC64, Arg, SPDiff, ArgOffset,
                                   TailCallArguments);
 }
 
 static void
 PrepareTailCall(SelectionDAG &DAG, SDValue &InFlag, SDValue &Chain,
                 const SDLoc &dl, int SPDiff, unsigned NumBytes, SDValue LROp,
                 SDValue FPOp,
                 SmallVectorImpl<TailCallArgumentInfo> &TailCallArguments) {
   // Emit a sequence of copyto/copyfrom virtual registers for arguments that
   // might overwrite each other in case of tail call optimization.
   SmallVector<SDValue, 8> MemOpChains2;
   // Do not flag preceding copytoreg stuff together with the following stuff.
   InFlag = SDValue();
   StoreTailCallArgumentsToStackSlot(DAG, Chain, TailCallArguments,
                                     MemOpChains2, dl);
   if (!MemOpChains2.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains2);
 
   // Store the return address to the appropriate stack slot.
   Chain = EmitTailCallStoreFPAndRetAddr(DAG, Chain, LROp, FPOp, SPDiff, dl);
 
   // Emit callseq_end just before tailcall node.
   Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, dl, true),
                              DAG.getIntPtrConstant(0, dl, true), InFlag, dl);
   InFlag = Chain.getValue(1);
 }
 
 // Is this global address that of a function that can be called by name? (as
 // opposed to something that must hold a descriptor for an indirect call).
 static bool isFunctionGlobalAddress(SDValue Callee) {
   if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
     if (Callee.getOpcode() == ISD::GlobalTLSAddress ||
         Callee.getOpcode() == ISD::TargetGlobalTLSAddress)
       return false;
 
     return G->getGlobal()->getValueType()->isFunctionTy();
   }
 
   return false;
 }
 
 SDValue PPCTargetLowering::LowerCallResult(
     SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
   SmallVector<CCValAssign, 16> RVLocs;
   CCState CCRetInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
                     *DAG.getContext());
 
   CCRetInfo.AnalyzeCallResult(
       Ins, (Subtarget.isSVR4ABI() && CallConv == CallingConv::Cold)
                ? RetCC_PPC_Cold
                : RetCC_PPC);
 
   // Copy all of the result registers out of their specified physreg.
   for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
     CCValAssign &VA = RVLocs[i];
     assert(VA.isRegLoc() && "Can only return in registers!");
 
     SDValue Val;
 
     if (Subtarget.hasSPE() && VA.getLocVT() == MVT::f64) {
       SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
                                       InFlag);
       Chain = Lo.getValue(1);
       InFlag = Lo.getValue(2);
       VA = RVLocs[++i]; // skip ahead to next loc
       SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
                                       InFlag);
       Chain = Hi.getValue(1);
       InFlag = Hi.getValue(2);
       if (!Subtarget.isLittleEndian())
         std::swap (Lo, Hi);
       Val = DAG.getNode(PPCISD::BUILD_SPE64, dl, MVT::f64, Lo, Hi);
     } else {
       Val = DAG.getCopyFromReg(Chain, dl,
                                VA.getLocReg(), VA.getLocVT(), InFlag);
       Chain = Val.getValue(1);
       InFlag = Val.getValue(2);
     }
 
     switch (VA.getLocInfo()) {
     default: llvm_unreachable("Unknown loc info!");
     case CCValAssign::Full: break;
     case CCValAssign::AExt:
       Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
       break;
     case CCValAssign::ZExt:
       Val = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), Val,
                         DAG.getValueType(VA.getValVT()));
       Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
       break;
     case CCValAssign::SExt:
       Val = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), Val,
                         DAG.getValueType(VA.getValVT()));
       Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
       break;
     }
 
     InVals.push_back(Val);
   }
 
   return Chain;
 }
 
 static bool isIndirectCall(const SDValue &Callee, SelectionDAG &DAG,
                            const PPCSubtarget &Subtarget, bool isPatchPoint) {
   // PatchPoint calls are not indirect.
   if (isPatchPoint)
     return false;
 
   if (isFunctionGlobalAddress(Callee) || dyn_cast<ExternalSymbolSDNode>(Callee))
     return false;
 
   // Darwin, and 32-bit ELF can use a BLA. The descriptor based ABIs can not
   // becuase the immediate function pointer points to a descriptor instead of
   // a function entry point. The ELFv2 ABI cannot use a BLA because the function
   // pointer immediate points to the global entry point, while the BLA would
   // need to jump to the local entry point (see rL211174).
   if (!Subtarget.usesFunctionDescriptors() && !Subtarget.isELFv2ABI() &&
       isBLACompatibleAddress(Callee, DAG))
     return false;
 
   return true;
 }
 
 static unsigned getCallOpcode(bool isIndirectCall, bool isPatchPoint,
                               bool isTailCall, const Function &Caller,
                               const SDValue &Callee,
                               const PPCSubtarget &Subtarget,
                               const TargetMachine &TM) {
   if (isTailCall)
     return PPCISD::TC_RETURN;
 
   // This is a call through a function pointer.
   if (isIndirectCall) {
     // AIX and the 64-bit ELF ABIs need to maintain the TOC pointer accross
     // indirect calls. The save of the caller's TOC pointer to the stack will be
     // inserted into the DAG as part of call lowering. The restore of the TOC
     // pointer is modeled by using a pseudo instruction for the call opcode that
     // represents the 2 instruction sequence of an indirect branch and link,
     // immediately followed by a load of the TOC pointer from the the stack save
     // slot into gpr2.
     if (Subtarget.isAIXABI() || Subtarget.is64BitELFABI())
       return PPCISD::BCTRL_LOAD_TOC;
 
     // An indirect call that does not need a TOC restore.
     return PPCISD::BCTRL;
   }
 
   // The ABIs that maintain a TOC pointer accross calls need to have a nop
   // immediately following the call instruction if the caller and callee may
   // have different TOC bases. At link time if the linker determines the calls
   // may not share a TOC base, the call is redirected to a trampoline inserted
   // by the linker. The trampoline will (among other things) save the callers
   // TOC pointer at an ABI designated offset in the linkage area and the linker
   // will rewrite the nop to be a load of the TOC pointer from the linkage area
   // into gpr2.
   if (Subtarget.isAIXABI() || Subtarget.is64BitELFABI())
     return callsShareTOCBase(&Caller, Callee, TM) ? PPCISD::CALL
                                                   : PPCISD::CALL_NOP;
 
   return PPCISD::CALL;
 }
 
 static bool isValidAIXExternalSymSDNode(StringRef SymName) {
   return StringSwitch<bool>(SymName)
       .Cases("__divdi3", "__fixunsdfdi", "__floatundidf", "__floatundisf",
              "__moddi3", "__udivdi3", "__umoddi3", true)
       .Cases("ceil", "floor", "memcpy", "memmove", "memset", "round", true)
       .Default(false);
 }
 
 static SDValue transformCallee(const SDValue &Callee, SelectionDAG &DAG,
                                const SDLoc &dl, const PPCSubtarget &Subtarget) {
   if (!Subtarget.usesFunctionDescriptors() && !Subtarget.isELFv2ABI())
     if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG))
       return SDValue(Dest, 0);
 
   // Returns true if the callee is local, and false otherwise.
   auto isLocalCallee = [&]() {
     const GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
     const Module *Mod = DAG.getMachineFunction().getFunction().getParent();
     const GlobalValue *GV = G ? G->getGlobal() : nullptr;
 
     return DAG.getTarget().shouldAssumeDSOLocal(*Mod, GV) &&
            !dyn_cast_or_null<GlobalIFunc>(GV);
   };
 
   // The PLT is only used in 32-bit ELF PIC mode.  Attempting to use the PLT in
   // a static relocation model causes some versions of GNU LD (2.17.50, at
   // least) to force BSS-PLT, instead of secure-PLT, even if all objects are
   // built with secure-PLT.
   bool UsePlt =
       Subtarget.is32BitELFABI() && !isLocalCallee() &&
       Subtarget.getTargetMachine().getRelocationModel() == Reloc::PIC_;
 
   // On AIX, direct function calls reference the symbol for the function's
   // entry point, which is named by prepending a "." before the function's
   // C-linkage name.
   const auto getAIXFuncEntryPointSymbolSDNode =
       [&](StringRef FuncName, bool IsDeclaration,
           const XCOFF::StorageClass &SC) {
         auto &Context = DAG.getMachineFunction().getMMI().getContext();
 
         MCSymbolXCOFF *S = cast<MCSymbolXCOFF>(
             Context.getOrCreateSymbol(Twine(".") + Twine(FuncName)));
 
         if (IsDeclaration && !S->hasContainingCsect()) {
           // On AIX, an undefined symbol needs to be associated with a
           // MCSectionXCOFF to get the correct storage mapping class.
           // In this case, XCOFF::XMC_PR.
           MCSectionXCOFF *Sec = Context.getXCOFFSection(
               S->getName(), XCOFF::XMC_PR, XCOFF::XTY_ER, SC,
               SectionKind::getMetadata());
           S->setContainingCsect(Sec);
         }
 
         MVT PtrVT =
             DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout());
         return DAG.getMCSymbol(S, PtrVT);
       };
 
   if (isFunctionGlobalAddress(Callee)) {
     const GlobalAddressSDNode *G = cast<GlobalAddressSDNode>(Callee);
     const GlobalValue *GV = G->getGlobal();
 
     if (!Subtarget.isAIXABI())
       return DAG.getTargetGlobalAddress(GV, dl, Callee.getValueType(), 0,
                                         UsePlt ? PPCII::MO_PLT : 0);
 
     assert(!isa<GlobalIFunc>(GV) && "IFunc is not supported on AIX.");
     const GlobalObject *GO = cast<GlobalObject>(GV);
     const XCOFF::StorageClass SC =
         TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(GO);
     return getAIXFuncEntryPointSymbolSDNode(GO->getName(), GO->isDeclaration(),
                                             SC);
   }
 
   if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
     const char *SymName = S->getSymbol();
     if (!Subtarget.isAIXABI())
       return DAG.getTargetExternalSymbol(SymName, Callee.getValueType(),
                                          UsePlt ? PPCII::MO_PLT : 0);
 
     // If there exists a user-declared function whose name is the same as the
     // ExternalSymbol's, then we pick up the user-declared version.
     const Module *Mod = DAG.getMachineFunction().getFunction().getParent();
     if (const Function *F =
             dyn_cast_or_null<Function>(Mod->getNamedValue(SymName))) {
       const XCOFF::StorageClass SC =
           TargetLoweringObjectFileXCOFF::getStorageClassForGlobal(F);
       return getAIXFuncEntryPointSymbolSDNode(F->getName(), F->isDeclaration(),
                                               SC);
     }
 
     // TODO: Remove this when the support for ExternalSymbolSDNode is complete.
     if (isValidAIXExternalSymSDNode(SymName)) {
       return getAIXFuncEntryPointSymbolSDNode(SymName, true, XCOFF::C_EXT);
     }
 
     report_fatal_error("Unexpected ExternalSymbolSDNode: " + Twine(SymName));
   }
 
   // No transformation needed.
   assert(Callee.getNode() && "What no callee?");
   return Callee;
 }
 
 static SDValue getOutputChainFromCallSeq(SDValue CallSeqStart) {
   assert(CallSeqStart.getOpcode() == ISD::CALLSEQ_START &&
          "Expected a CALLSEQ_STARTSDNode.");
 
   // The last operand is the chain, except when the node has glue. If the node
   // has glue, then the last operand is the glue, and the chain is the second
   // last operand.
   SDValue LastValue = CallSeqStart.getValue(CallSeqStart->getNumValues() - 1);
   if (LastValue.getValueType() != MVT::Glue)
     return LastValue;
 
   return CallSeqStart.getValue(CallSeqStart->getNumValues() - 2);
 }
 
 // Creates the node that moves a functions address into the count register
 // to prepare for an indirect call instruction.
 static void prepareIndirectCall(SelectionDAG &DAG, SDValue &Callee,
                                 SDValue &Glue, SDValue &Chain,
                                 const SDLoc &dl) {
   SDValue MTCTROps[] = {Chain, Callee, Glue};
   EVT ReturnTypes[] = {MVT::Other, MVT::Glue};
   Chain = DAG.getNode(PPCISD::MTCTR, dl, makeArrayRef(ReturnTypes, 2),
                       makeArrayRef(MTCTROps, Glue.getNode() ? 3 : 2));
   // The glue is the second value produced.
   Glue = Chain.getValue(1);
 }
 
 static void prepareDescriptorIndirectCall(SelectionDAG &DAG, SDValue &Callee,
                                           SDValue &Glue, SDValue &Chain,
                                           SDValue CallSeqStart,
                                           ImmutableCallSite CS, const SDLoc &dl,
                                           bool hasNest,
                                           const PPCSubtarget &Subtarget) {
   // Function pointers in the 64-bit SVR4 ABI do not point to the function
   // entry point, but to the function descriptor (the function entry point
   // address is part of the function descriptor though).
   // The function descriptor is a three doubleword structure with the
   // following fields: function entry point, TOC base address and
   // environment pointer.
   // Thus for a call through a function pointer, the following actions need
   // to be performed:
   //   1. Save the TOC of the caller in the TOC save area of its stack
   //      frame (this is done in LowerCall_Darwin() or LowerCall_64SVR4()).
   //   2. Load the address of the function entry point from the function
   //      descriptor.
   //   3. Load the TOC of the callee from the function descriptor into r2.
   //   4. Load the environment pointer from the function descriptor into
   //      r11.
   //   5. Branch to the function entry point address.
   //   6. On return of the callee, the TOC of the caller needs to be
   //      restored (this is done in FinishCall()).
   //
   // The loads are scheduled at the beginning of the call sequence, and the
   // register copies are flagged together to ensure that no other
   // operations can be scheduled in between. E.g. without flagging the
   // copies together, a TOC access in the caller could be scheduled between
   // the assignment of the callee TOC and the branch to the callee, which leads
   // to incorrect code.
 
   // Start by loading the function address from the descriptor.
   SDValue LDChain = getOutputChainFromCallSeq(CallSeqStart);
   auto MMOFlags = Subtarget.hasInvariantFunctionDescriptors()
                       ? (MachineMemOperand::MODereferenceable |
                          MachineMemOperand::MOInvariant)
                       : MachineMemOperand::MONone;
 
   MachinePointerInfo MPI(CS ? CS.getCalledValue() : nullptr);
 
   // Registers used in building the DAG.
   const MCRegister EnvPtrReg = Subtarget.getEnvironmentPointerRegister();
   const MCRegister TOCReg = Subtarget.getTOCPointerRegister();
 
   // Offsets of descriptor members.
   const unsigned TOCAnchorOffset = Subtarget.descriptorTOCAnchorOffset();
   const unsigned EnvPtrOffset = Subtarget.descriptorEnvironmentPointerOffset();
 
   const MVT RegVT = Subtarget.isPPC64() ? MVT::i64 : MVT::i32;
   const unsigned Alignment = Subtarget.isPPC64() ? 8 : 4;
 
   // One load for the functions entry point address.
   SDValue LoadFuncPtr = DAG.getLoad(RegVT, dl, LDChain, Callee, MPI,
                                     Alignment, MMOFlags);
 
   // One for loading the TOC anchor for the module that contains the called
   // function.
   SDValue TOCOff = DAG.getIntPtrConstant(TOCAnchorOffset, dl);
   SDValue AddTOC = DAG.getNode(ISD::ADD, dl, RegVT, Callee, TOCOff);
   SDValue TOCPtr =
       DAG.getLoad(RegVT, dl, LDChain, AddTOC,
                   MPI.getWithOffset(TOCAnchorOffset), Alignment, MMOFlags);
 
   // One for loading the environment pointer.
   SDValue PtrOff = DAG.getIntPtrConstant(EnvPtrOffset, dl);
   SDValue AddPtr = DAG.getNode(ISD::ADD, dl, RegVT, Callee, PtrOff);
   SDValue LoadEnvPtr =
       DAG.getLoad(RegVT, dl, LDChain, AddPtr,
                   MPI.getWithOffset(EnvPtrOffset), Alignment, MMOFlags);
 
 
   // Then copy the newly loaded TOC anchor to the TOC pointer.
   SDValue TOCVal = DAG.getCopyToReg(Chain, dl, TOCReg, TOCPtr, Glue);
   Chain = TOCVal.getValue(0);
   Glue = TOCVal.getValue(1);
 
   // If the function call has an explicit 'nest' parameter, it takes the
   // place of the environment pointer.
   assert((!hasNest || !Subtarget.isAIXABI()) &&
          "Nest parameter is not supported on AIX.");
   if (!hasNest) {
     SDValue EnvVal = DAG.getCopyToReg(Chain, dl, EnvPtrReg, LoadEnvPtr, Glue);
     Chain = EnvVal.getValue(0);
     Glue = EnvVal.getValue(1);
   }
 
   // The rest of the indirect call sequence is the same as the non-descriptor
   // DAG.
   prepareIndirectCall(DAG, LoadFuncPtr, Glue, Chain, dl);
 }
 
 static void
 buildCallOperands(SmallVectorImpl<SDValue> &Ops, CallingConv::ID CallConv,
                   const SDLoc &dl, bool isTailCall, bool isVarArg,
                   bool isPatchPoint, bool hasNest, SelectionDAG &DAG,
                   SmallVector<std::pair<unsigned, SDValue>, 8> &RegsToPass,
                   SDValue Glue, SDValue Chain, SDValue &Callee, int SPDiff,
                   const PPCSubtarget &Subtarget, bool isIndirect) {
   const bool IsPPC64 = Subtarget.isPPC64();
   // MVT for a general purpose register.
   const MVT RegVT = IsPPC64 ? MVT::i64 : MVT::i32;
 
   // First operand is always the chain.
   Ops.push_back(Chain);
 
   // If it's a direct call pass the callee as the second operand.
   if (!isIndirect)
     Ops.push_back(Callee);
   else {
     assert(!isPatchPoint && "Patch point call are not indirect.");
 
     // For the TOC based ABIs, we have saved the TOC pointer to the linkage area
     // on the stack (this would have been done in `LowerCall_64SVR4` or
     // `LowerCall_AIX`). The call instruction is a pseudo instruction that
     // represents both the indirect branch and a load that restores the TOC
     // pointer from the linkage area. The operand for the TOC restore is an add
     // of the TOC save offset to the stack pointer. This must be the second
     // operand: after the chain input but before any other variadic arguments.
     if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) {
       const MCRegister StackPtrReg = Subtarget.getStackPointerRegister();
 
       SDValue StackPtr = DAG.getRegister(StackPtrReg, RegVT);
       unsigned TOCSaveOffset = Subtarget.getFrameLowering()->getTOCSaveOffset();
       SDValue TOCOff = DAG.getIntPtrConstant(TOCSaveOffset, dl);
       SDValue AddTOC = DAG.getNode(ISD::ADD, dl, RegVT, StackPtr, TOCOff);
       Ops.push_back(AddTOC);
     }
 
     // Add the register used for the environment pointer.
     if (Subtarget.usesFunctionDescriptors() && !hasNest)
       Ops.push_back(DAG.getRegister(Subtarget.getEnvironmentPointerRegister(),
                                     RegVT));
 
 
     // Add CTR register as callee so a bctr can be emitted later.
     if (isTailCall)
       Ops.push_back(DAG.getRegister(IsPPC64 ? PPC::CTR8 : PPC::CTR, RegVT));
   }
 
   // If this is a tail call add stack pointer delta.
   if (isTailCall)
     Ops.push_back(DAG.getConstant(SPDiff, dl, MVT::i32));
 
   // Add argument registers to the end of the list so that they are known live
   // into the call.
   for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
     Ops.push_back(DAG.getRegister(RegsToPass[i].first,
                                   RegsToPass[i].second.getValueType()));
 
   // We cannot add R2/X2 as an operand here for PATCHPOINT, because there is
   // no way to mark dependencies as implicit here.
   // We will add the R2/X2 dependency in EmitInstrWithCustomInserter.
   if ((Subtarget.is64BitELFABI() || Subtarget.isAIXABI()) && !isPatchPoint)
     Ops.push_back(DAG.getRegister(Subtarget.getTOCPointerRegister(), RegVT));
 
   // Add implicit use of CR bit 6 for 32-bit SVR4 vararg calls
   if (isVarArg && Subtarget.is32BitELFABI())
     Ops.push_back(DAG.getRegister(PPC::CR1EQ, MVT::i32));
 
   // Add a register mask operand representing the call-preserved registers.
   const TargetRegisterInfo *TRI = Subtarget.getRegisterInfo();
   const uint32_t *Mask =
       TRI->getCallPreservedMask(DAG.getMachineFunction(), CallConv);
   assert(Mask && "Missing call preserved mask for calling convention");
   Ops.push_back(DAG.getRegisterMask(Mask));
 
   // If the glue is valid, it is the last operand.
   if (Glue.getNode())
     Ops.push_back(Glue);
 }
 
 SDValue PPCTargetLowering::FinishCall(
     CallingConv::ID CallConv, const SDLoc &dl, bool isTailCall, bool isVarArg,
     bool isPatchPoint, bool hasNest, SelectionDAG &DAG,
     SmallVector<std::pair<unsigned, SDValue>, 8> &RegsToPass, SDValue Glue,
     SDValue Chain, SDValue CallSeqStart, SDValue &Callee, int SPDiff,
     unsigned NumBytes, const SmallVectorImpl<ISD::InputArg> &Ins,
     SmallVectorImpl<SDValue> &InVals, ImmutableCallSite CS) const {
 
   if (Subtarget.is64BitELFABI() || Subtarget.isAIXABI())
     setUsesTOCBasePtr(DAG);
 
   const bool isIndirect = isIndirectCall(Callee, DAG, Subtarget, isPatchPoint);
   unsigned CallOpc = getCallOpcode(isIndirect, isPatchPoint, isTailCall,
                                    DAG.getMachineFunction().getFunction(),
                                    Callee, Subtarget, DAG.getTarget());
 
   if (!isIndirect)
     Callee = transformCallee(Callee, DAG, dl, Subtarget);
   else if (Subtarget.usesFunctionDescriptors())
     prepareDescriptorIndirectCall(DAG, Callee, Glue, Chain, CallSeqStart, CS,
                                   dl, hasNest, Subtarget);
   else
     prepareIndirectCall(DAG, Callee, Glue, Chain, dl);
 
   // Build the operand list for the call instruction.
   SmallVector<SDValue, 8> Ops;
   buildCallOperands(Ops, CallConv, dl, isTailCall, isVarArg, isPatchPoint,
                     hasNest, DAG, RegsToPass, Glue, Chain, Callee, SPDiff,
                     Subtarget, isIndirect);
 
   // Emit tail call.
   if (isTailCall) {
     assert(((Callee.getOpcode() == ISD::Register &&
              cast<RegisterSDNode>(Callee)->getReg() == PPC::CTR) ||
             Callee.getOpcode() == ISD::TargetExternalSymbol ||
             Callee.getOpcode() == ISD::TargetGlobalAddress ||
             isa<ConstantSDNode>(Callee)) &&
            "Expecting a global address, external symbol, absolute value or "
            "register");
     assert(CallOpc == PPCISD::TC_RETURN &&
            "Unexpected call opcode for a tail call.");
     DAG.getMachineFunction().getFrameInfo().setHasTailCall();
     return DAG.getNode(CallOpc, dl, MVT::Other, Ops);
   }
 
   std::array<EVT, 2> ReturnTypes = {{MVT::Other, MVT::Glue}};
   Chain = DAG.getNode(CallOpc, dl, ReturnTypes, Ops);
   Glue = Chain.getValue(1);
 
   // When performing tail call optimization the callee pops its arguments off
   // the stack. Account for this here so these bytes can be pushed back on in
   // PPCFrameLowering::eliminateCallFramePseudoInstr.
   int BytesCalleePops = (CallConv == CallingConv::Fast &&
                          getTargetMachine().Options.GuaranteedTailCallOpt)
                             ? NumBytes
                             : 0;
 
   Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, dl, true),
                              DAG.getIntPtrConstant(BytesCalleePops, dl, true),
                              Glue, dl);
   Glue = Chain.getValue(1);
 
   return LowerCallResult(Chain, Glue, CallConv, isVarArg, Ins, dl, DAG, InVals);
 }
 
 SDValue
 PPCTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
                              SmallVectorImpl<SDValue> &InVals) const {
   SelectionDAG &DAG                     = CLI.DAG;
   SDLoc &dl                             = CLI.DL;
   SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
   SmallVectorImpl<SDValue> &OutVals     = CLI.OutVals;
   SmallVectorImpl<ISD::InputArg> &Ins   = CLI.Ins;
   SDValue Chain                         = CLI.Chain;
   SDValue Callee                        = CLI.Callee;
   bool &isTailCall                      = CLI.IsTailCall;
   CallingConv::ID CallConv              = CLI.CallConv;
   bool isVarArg                         = CLI.IsVarArg;
   bool isPatchPoint                     = CLI.IsPatchPoint;
   ImmutableCallSite CS                  = CLI.CS;
 
   if (isTailCall) {
     if (Subtarget.useLongCalls() && !(CS && CS.isMustTailCall()))
       isTailCall = false;
     else if (Subtarget.isSVR4ABI() && Subtarget.isPPC64())
       isTailCall =
         IsEligibleForTailCallOptimization_64SVR4(Callee, CallConv, CS,
                                                  isVarArg, Outs, Ins, DAG);
     else
       isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv, isVarArg,
                                                      Ins, DAG);
     if (isTailCall) {
       ++NumTailCalls;
       if (!getTargetMachine().Options.GuaranteedTailCallOpt)
         ++NumSiblingCalls;
 
       assert(isa<GlobalAddressSDNode>(Callee) &&
              "Callee should be an llvm::Function object.");
       LLVM_DEBUG(
           const GlobalValue *GV =
               cast<GlobalAddressSDNode>(Callee)->getGlobal();
           const unsigned Width =
               80 - strlen("TCO caller: ") - strlen(", callee linkage: 0, 0");
           dbgs() << "TCO caller: "
                  << left_justify(DAG.getMachineFunction().getName(), Width)
                  << ", callee linkage: " << GV->getVisibility() << ", "
                  << GV->getLinkage() << "\n");
     }
   }
 
   if (!isTailCall && CS && CS.isMustTailCall())
     report_fatal_error("failed to perform tail call elimination on a call "
                        "site marked musttail");
 
   // When long calls (i.e. indirect calls) are always used, calls are always
   // made via function pointer. If we have a function name, first translate it
   // into a pointer.
   if (Subtarget.useLongCalls() && isa<GlobalAddressSDNode>(Callee) &&
       !isTailCall)
     Callee = LowerGlobalAddress(Callee, DAG);
 
   if (Subtarget.isSVR4ABI() && Subtarget.isPPC64())
     return LowerCall_64SVR4(Chain, Callee, CallConv, isVarArg,
                             isTailCall, isPatchPoint, Outs, OutVals, Ins,
                             dl, DAG, InVals, CS);
 
   if (Subtarget.isSVR4ABI())
     return LowerCall_32SVR4(Chain, Callee, CallConv, isVarArg,
                             isTailCall, isPatchPoint, Outs, OutVals, Ins,
                             dl, DAG, InVals, CS);
 
   if (Subtarget.isAIXABI())
     return LowerCall_AIX(Chain, Callee, CallConv, isVarArg,
                          isTailCall, isPatchPoint, Outs, OutVals, Ins,
                          dl, DAG, InVals, CS);
 
   return LowerCall_Darwin(Chain, Callee, CallConv, isVarArg,
                           isTailCall, isPatchPoint, Outs, OutVals, Ins,
                           dl, DAG, InVals, CS);
 }
 
 SDValue PPCTargetLowering::LowerCall_32SVR4(
     SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg,
     bool isTailCall, bool isPatchPoint,
     const SmallVectorImpl<ISD::OutputArg> &Outs,
     const SmallVectorImpl<SDValue> &OutVals,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
     ImmutableCallSite CS) const {
   // See PPCTargetLowering::LowerFormalArguments_32SVR4() for a description
   // of the 32-bit SVR4 ABI stack frame layout.
 
   assert((CallConv == CallingConv::C ||
           CallConv == CallingConv::Cold ||
           CallConv == CallingConv::Fast) && "Unknown calling convention!");
 
   unsigned PtrByteSize = 4;
 
   MachineFunction &MF = DAG.getMachineFunction();
 
   // Mark this function as potentially containing a function that contains a
   // tail call. As a consequence the frame pointer will be used for dynamicalloc
   // and restoring the callers stack pointer in this functions epilog. This is
   // done because by tail calling the called function might overwrite the value
   // in this function's (MF) stack pointer stack slot 0(SP).
   if (getTargetMachine().Options.GuaranteedTailCallOpt &&
       CallConv == CallingConv::Fast)
     MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
 
   // Count how many bytes are to be pushed on the stack, including the linkage
   // area, parameter list area and the part of the local variable space which
   // contains copies of aggregates which are passed by value.
 
   // Assign locations to all of the outgoing arguments.
   SmallVector<CCValAssign, 16> ArgLocs;
   PPCCCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
 
   // Reserve space for the linkage area on the stack.
   CCInfo.AllocateStack(Subtarget.getFrameLowering()->getLinkageSize(),
                        PtrByteSize);
   if (useSoftFloat())
     CCInfo.PreAnalyzeCallOperands(Outs);
 
   if (isVarArg) {
     // Handle fixed and variable vector arguments differently.
     // Fixed vector arguments go into registers as long as registers are
     // available. Variable vector arguments always go into memory.
     unsigned NumArgs = Outs.size();
 
     for (unsigned i = 0; i != NumArgs; ++i) {
       MVT ArgVT = Outs[i].VT;
       ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
       bool Result;
 
       if (Outs[i].IsFixed) {
         Result = CC_PPC32_SVR4(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags,
                                CCInfo);
       } else {
         Result = CC_PPC32_SVR4_VarArg(i, ArgVT, ArgVT, CCValAssign::Full,
                                       ArgFlags, CCInfo);
       }
 
       if (Result) {
 #ifndef NDEBUG
         errs() << "Call operand #" << i << " has unhandled type "
              << EVT(ArgVT).getEVTString() << "\n";
 #endif
         llvm_unreachable(nullptr);
       }
     }
   } else {
     // All arguments are treated the same.
     CCInfo.AnalyzeCallOperands(Outs, CC_PPC32_SVR4);
   }
   CCInfo.clearWasPPCF128();
 
   // Assign locations to all of the outgoing aggregate by value arguments.
   SmallVector<CCValAssign, 16> ByValArgLocs;
   CCState CCByValInfo(CallConv, isVarArg, MF, ByValArgLocs, *DAG.getContext());
 
   // Reserve stack space for the allocations in CCInfo.
   CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
 
   CCByValInfo.AnalyzeCallOperands(Outs, CC_PPC32_SVR4_ByVal);
 
   // Size of the linkage area, parameter list area and the part of the local
   // space variable where copies of aggregates which are passed by value are
   // stored.
   unsigned NumBytes = CCByValInfo.getNextStackOffset();
 
   // Calculate by how many bytes the stack has to be adjusted in case of tail
   // call optimization.
   int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
 
   // Adjust the stack pointer for the new arguments...
   // These operations are automatically eliminated by the prolog/epilog pass
   Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl);
   SDValue CallSeqStart = Chain;
 
   // Load the return address and frame pointer so it can be moved somewhere else
   // later.
   SDValue LROp, FPOp;
   Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, dl);
 
   // Set up a copy of the stack pointer for use loading and storing any
   // arguments that may not fit in the registers available for argument
   // passing.
   SDValue StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
 
   SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
   SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
   SmallVector<SDValue, 8> MemOpChains;
 
   bool seenFloatArg = false;
   // Walk the register/memloc assignments, inserting copies/loads.
   // i - Tracks the index into the list of registers allocated for the call
   // RealArgIdx - Tracks the index into the list of actual function arguments
   // j - Tracks the index into the list of byval arguments
   for (unsigned i = 0, RealArgIdx = 0, j = 0, e = ArgLocs.size();
        i != e;
        ++i, ++RealArgIdx) {
     CCValAssign &VA = ArgLocs[i];
     SDValue Arg = OutVals[RealArgIdx];
     ISD::ArgFlagsTy Flags = Outs[RealArgIdx].Flags;
 
     if (Flags.isByVal()) {
       // Argument is an aggregate which is passed by value, thus we need to
       // create a copy of it in the local variable space of the current stack
       // frame (which is the stack frame of the caller) and pass the address of
       // this copy to the callee.
       assert((j < ByValArgLocs.size()) && "Index out of bounds!");
       CCValAssign &ByValVA = ByValArgLocs[j++];
       assert((VA.getValNo() == ByValVA.getValNo()) && "ValNo mismatch!");
 
       // Memory reserved in the local variable space of the callers stack frame.
       unsigned LocMemOffset = ByValVA.getLocMemOffset();
 
       SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset, dl);
       PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(MF.getDataLayout()),
                            StackPtr, PtrOff);
 
       // Create a copy of the argument in the local area of the current
       // stack frame.
       SDValue MemcpyCall =
         CreateCopyOfByValArgument(Arg, PtrOff,
                                   CallSeqStart.getNode()->getOperand(0),
                                   Flags, DAG, dl);
 
       // This must go outside the CALLSEQ_START..END.
       SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall, NumBytes, 0,
                                                      SDLoc(MemcpyCall));
       DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
                              NewCallSeqStart.getNode());
       Chain = CallSeqStart = NewCallSeqStart;
 
       // Pass the address of the aggregate copy on the stack either in a
       // physical register or in the parameter list area of the current stack
       // frame to the callee.
       Arg = PtrOff;
     }
 
     // When useCRBits() is true, there can be i1 arguments.
     // It is because getRegisterType(MVT::i1) => MVT::i1,
     // and for other integer types getRegisterType() => MVT::i32.
     // Extend i1 and ensure callee will get i32.
     if (Arg.getValueType() == MVT::i1)
       Arg = DAG.getNode(Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND,
                         dl, MVT::i32, Arg);
 
     if (VA.isRegLoc()) {
       seenFloatArg |= VA.getLocVT().isFloatingPoint();
       // Put argument in a physical register.
       if (Subtarget.hasSPE() && Arg.getValueType() == MVT::f64) {
         bool IsLE = Subtarget.isLittleEndian();
         SDValue SVal = DAG.getNode(PPCISD::EXTRACT_SPE, dl, MVT::i32, Arg,
                         DAG.getIntPtrConstant(IsLE ? 0 : 1, dl));
         RegsToPass.push_back(std::make_pair(VA.getLocReg(), SVal.getValue(0)));
         SVal = DAG.getNode(PPCISD::EXTRACT_SPE, dl, MVT::i32, Arg,
                            DAG.getIntPtrConstant(IsLE ? 1 : 0, dl));
         RegsToPass.push_back(std::make_pair(ArgLocs[++i].getLocReg(),
                              SVal.getValue(0)));
       } else
         RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
     } else {
       // Put argument in the parameter list area of the current stack frame.
       assert(VA.isMemLoc());
       unsigned LocMemOffset = VA.getLocMemOffset();
 
       if (!isTailCall) {
         SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset, dl);
         PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(MF.getDataLayout()),
                              StackPtr, PtrOff);
 
         MemOpChains.push_back(
             DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo()));
       } else {
         // Calculate and remember argument location.
         CalculateTailCallArgDest(DAG, MF, false, Arg, SPDiff, LocMemOffset,
                                  TailCallArguments);
       }
     }
   }
 
   if (!MemOpChains.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
 
   // Build a sequence of copy-to-reg nodes chained together with token chain
   // and flag operands which copy the outgoing args into the appropriate regs.
   SDValue InFlag;
   for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
     Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
                              RegsToPass[i].second, InFlag);
     InFlag = Chain.getValue(1);
   }
 
   // Set CR bit 6 to true if this is a vararg call with floating args passed in
   // registers.
   if (isVarArg) {
     SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
     SDValue Ops[] = { Chain, InFlag };
 
     Chain = DAG.getNode(seenFloatArg ? PPCISD::CR6SET : PPCISD::CR6UNSET,
                         dl, VTs, makeArrayRef(Ops, InFlag.getNode() ? 2 : 1));
 
     InFlag = Chain.getValue(1);
   }
 
   if (isTailCall)
     PrepareTailCall(DAG, InFlag, Chain, dl, SPDiff, NumBytes, LROp, FPOp,
                     TailCallArguments);
 
   return FinishCall(CallConv, dl, isTailCall, isVarArg, isPatchPoint,
                     /* unused except on PPC64 ELFv1 */ false, DAG,
                     RegsToPass, InFlag, Chain, CallSeqStart, Callee, SPDiff,
                     NumBytes, Ins, InVals, CS);
 }
 
 // Copy an argument into memory, being careful to do this outside the
 // call sequence for the call to which the argument belongs.
 SDValue PPCTargetLowering::createMemcpyOutsideCallSeq(
     SDValue Arg, SDValue PtrOff, SDValue CallSeqStart, ISD::ArgFlagsTy Flags,
     SelectionDAG &DAG, const SDLoc &dl) const {
   SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, PtrOff,
                         CallSeqStart.getNode()->getOperand(0),
                         Flags, DAG, dl);
   // The MEMCPY must go outside the CALLSEQ_START..END.
   int64_t FrameSize = CallSeqStart.getConstantOperandVal(1);
   SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall, FrameSize, 0,
                                                  SDLoc(MemcpyCall));
   DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
                          NewCallSeqStart.getNode());
   return NewCallSeqStart;
 }
 
 SDValue PPCTargetLowering::LowerCall_64SVR4(
     SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg,
     bool isTailCall, bool isPatchPoint,
     const SmallVectorImpl<ISD::OutputArg> &Outs,
     const SmallVectorImpl<SDValue> &OutVals,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
     ImmutableCallSite CS) const {
   bool isELFv2ABI = Subtarget.isELFv2ABI();
   bool isLittleEndian = Subtarget.isLittleEndian();
   unsigned NumOps = Outs.size();
   bool hasNest = false;
   bool IsSibCall = false;
 
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   unsigned PtrByteSize = 8;
 
   MachineFunction &MF = DAG.getMachineFunction();
 
   if (isTailCall && !getTargetMachine().Options.GuaranteedTailCallOpt)
     IsSibCall = true;
 
   // Mark this function as potentially containing a function that contains a
   // tail call. As a consequence the frame pointer will be used for dynamicalloc
   // and restoring the callers stack pointer in this functions epilog. This is
   // done because by tail calling the called function might overwrite the value
   // in this function's (MF) stack pointer stack slot 0(SP).
   if (getTargetMachine().Options.GuaranteedTailCallOpt &&
       CallConv == CallingConv::Fast)
     MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
 
   assert(!(CallConv == CallingConv::Fast && isVarArg) &&
          "fastcc not supported on varargs functions");
 
   // Count how many bytes are to be pushed on the stack, including the linkage
   // area, and parameter passing area.  On ELFv1, the linkage area is 48 bytes
   // reserved space for [SP][CR][LR][2 x unused][TOC]; on ELFv2, the linkage
   // area is 32 bytes reserved space for [SP][CR][LR][TOC].
   unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   unsigned NumBytes = LinkageSize;
   unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
   unsigned &QFPR_idx = FPR_idx;
 
   static const MCPhysReg GPR[] = {
     PPC::X3, PPC::X4, PPC::X5, PPC::X6,
     PPC::X7, PPC::X8, PPC::X9, PPC::X10,
   };
   static const MCPhysReg VR[] = {
     PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
     PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
   };
 
   const unsigned NumGPRs = array_lengthof(GPR);
   const unsigned NumFPRs = useSoftFloat() ? 0 : 13;
   const unsigned NumVRs  = array_lengthof(VR);
   const unsigned NumQFPRs = NumFPRs;
 
   // On ELFv2, we can avoid allocating the parameter area if all the arguments
   // can be passed to the callee in registers.
   // For the fast calling convention, there is another check below.
   // Note: We should keep consistent with LowerFormalArguments_64SVR4()
   bool HasParameterArea = !isELFv2ABI || isVarArg || CallConv == CallingConv::Fast;
   if (!HasParameterArea) {
     unsigned ParamAreaSize = NumGPRs * PtrByteSize;
     unsigned AvailableFPRs = NumFPRs;
     unsigned AvailableVRs = NumVRs;
     unsigned NumBytesTmp = NumBytes;
     for (unsigned i = 0; i != NumOps; ++i) {
       if (Outs[i].Flags.isNest()) continue;
       if (CalculateStackSlotUsed(Outs[i].VT, Outs[i].ArgVT, Outs[i].Flags,
                                 PtrByteSize, LinkageSize, ParamAreaSize,
                                 NumBytesTmp, AvailableFPRs, AvailableVRs,
                                 Subtarget.hasQPX()))
         HasParameterArea = true;
     }
   }
 
   // When using the fast calling convention, we don't provide backing for
   // arguments that will be in registers.
   unsigned NumGPRsUsed = 0, NumFPRsUsed = 0, NumVRsUsed = 0;
 
   // Avoid allocating parameter area for fastcc functions if all the arguments
   // can be passed in the registers.
   if (CallConv == CallingConv::Fast)
     HasParameterArea = false;
 
   // Add up all the space actually used.
   for (unsigned i = 0; i != NumOps; ++i) {
     ISD::ArgFlagsTy Flags = Outs[i].Flags;
     EVT ArgVT = Outs[i].VT;
     EVT OrigVT = Outs[i].ArgVT;
 
     if (Flags.isNest())
       continue;
 
     if (CallConv == CallingConv::Fast) {
       if (Flags.isByVal()) {
         NumGPRsUsed += (Flags.getByValSize()+7)/8;
         if (NumGPRsUsed > NumGPRs)
           HasParameterArea = true;
       } else {
         switch (ArgVT.getSimpleVT().SimpleTy) {
         default: llvm_unreachable("Unexpected ValueType for argument!");
         case MVT::i1:
         case MVT::i32:
         case MVT::i64:
           if (++NumGPRsUsed <= NumGPRs)
             continue;
           break;
         case MVT::v4i32:
         case MVT::v8i16:
         case MVT::v16i8:
         case MVT::v2f64:
         case MVT::v2i64:
         case MVT::v1i128:
         case MVT::f128:
           if (++NumVRsUsed <= NumVRs)
             continue;
           break;
         case MVT::v4f32:
           // When using QPX, this is handled like a FP register, otherwise, it
           // is an Altivec register.
           if (Subtarget.hasQPX()) {
             if (++NumFPRsUsed <= NumFPRs)
               continue;
           } else {
             if (++NumVRsUsed <= NumVRs)
               continue;
           }
           break;
         case MVT::f32:
         case MVT::f64:
         case MVT::v4f64: // QPX
         case MVT::v4i1:  // QPX
           if (++NumFPRsUsed <= NumFPRs)
             continue;
           break;
         }
         HasParameterArea = true;
       }
     }
 
     /* Respect alignment of argument on the stack.  */
     unsigned Align =
       CalculateStackSlotAlignment(ArgVT, OrigVT, Flags, PtrByteSize);
     NumBytes = ((NumBytes + Align - 1) / Align) * Align;
 
     NumBytes += CalculateStackSlotSize(ArgVT, Flags, PtrByteSize);
     if (Flags.isInConsecutiveRegsLast())
       NumBytes = ((NumBytes + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
   }
 
   unsigned NumBytesActuallyUsed = NumBytes;
 
   // In the old ELFv1 ABI,
   // the prolog code of the callee may store up to 8 GPR argument registers to
   // the stack, allowing va_start to index over them in memory if its varargs.
   // Because we cannot tell if this is needed on the caller side, we have to
   // conservatively assume that it is needed.  As such, make sure we have at
   // least enough stack space for the caller to store the 8 GPRs.
   // In the ELFv2 ABI, we allocate the parameter area iff a callee
   // really requires memory operands, e.g. a vararg function.
   if (HasParameterArea)
     NumBytes = std::max(NumBytes, LinkageSize + 8 * PtrByteSize);
   else
     NumBytes = LinkageSize;
 
   // Tail call needs the stack to be aligned.
   if (getTargetMachine().Options.GuaranteedTailCallOpt &&
       CallConv == CallingConv::Fast)
     NumBytes = EnsureStackAlignment(Subtarget.getFrameLowering(), NumBytes);
 
   int SPDiff = 0;
 
   // Calculate by how many bytes the stack has to be adjusted in case of tail
   // call optimization.
   if (!IsSibCall)
     SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
 
   // To protect arguments on the stack from being clobbered in a tail call,
   // force all the loads to happen before doing any other lowering.
   if (isTailCall)
     Chain = DAG.getStackArgumentTokenFactor(Chain);
 
   // Adjust the stack pointer for the new arguments...
   // These operations are automatically eliminated by the prolog/epilog pass
   if (!IsSibCall)
     Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl);
   SDValue CallSeqStart = Chain;
 
   // Load the return address and frame pointer so it can be move somewhere else
   // later.
   SDValue LROp, FPOp;
   Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, dl);
 
   // Set up a copy of the stack pointer for use loading and storing any
   // arguments that may not fit in the registers available for argument
   // passing.
   SDValue StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
 
   // Figure out which arguments are going to go in registers, and which in
   // memory.  Also, if this is a vararg function, floating point operations
   // must be stored to our stack, and loaded into integer regs as well, if
   // any integer regs are available for argument passing.
   unsigned ArgOffset = LinkageSize;
 
   SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
   SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
 
   SmallVector<SDValue, 8> MemOpChains;
   for (unsigned i = 0; i != NumOps; ++i) {
     SDValue Arg = OutVals[i];
     ISD::ArgFlagsTy Flags = Outs[i].Flags;
     EVT ArgVT = Outs[i].VT;
     EVT OrigVT = Outs[i].ArgVT;
 
     // PtrOff will be used to store the current argument to the stack if a
     // register cannot be found for it.
     SDValue PtrOff;
 
     // We re-align the argument offset for each argument, except when using the
     // fast calling convention, when we need to make sure we do that only when
     // we'll actually use a stack slot.
     auto ComputePtrOff = [&]() {
       /* Respect alignment of argument on the stack.  */
       unsigned Align =
         CalculateStackSlotAlignment(ArgVT, OrigVT, Flags, PtrByteSize);
       ArgOffset = ((ArgOffset + Align - 1) / Align) * Align;
 
       PtrOff = DAG.getConstant(ArgOffset, dl, StackPtr.getValueType());
 
       PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
     };
 
     if (CallConv != CallingConv::Fast) {
       ComputePtrOff();
 
       /* Compute GPR index associated with argument offset.  */
       GPR_idx = (ArgOffset - LinkageSize) / PtrByteSize;
       GPR_idx = std::min(GPR_idx, NumGPRs);
     }
 
     // Promote integers to 64-bit values.
     if (Arg.getValueType() == MVT::i32 || Arg.getValueType() == MVT::i1) {
       // FIXME: Should this use ANY_EXTEND if neither sext nor zext?
       unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
       Arg = DAG.getNode(ExtOp, dl, MVT::i64, Arg);
     }
 
     // FIXME memcpy is used way more than necessary.  Correctness first.
     // Note: "by value" is code for passing a structure by value, not
     // basic types.
     if (Flags.isByVal()) {
       // Note: Size includes alignment padding, so
       //   struct x { short a; char b; }
       // will have Size = 4.  With #pragma pack(1), it will have Size = 3.
       // These are the proper values we need for right-justifying the
       // aggregate in a parameter register.
       unsigned Size = Flags.getByValSize();
 
       // An empty aggregate parameter takes up no storage and no
       // registers.
       if (Size == 0)
         continue;
 
       if (CallConv == CallingConv::Fast)
         ComputePtrOff();
 
       // All aggregates smaller than 8 bytes must be passed right-justified.
       if (Size==1 || Size==2 || Size==4) {
         EVT VT = (Size==1) ? MVT::i8 : ((Size==2) ? MVT::i16 : MVT::i32);
         if (GPR_idx != NumGPRs) {
           SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, PtrVT, Chain, Arg,
                                         MachinePointerInfo(), VT);
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
 
           ArgOffset += PtrByteSize;
           continue;
         }
       }
 
       if (GPR_idx == NumGPRs && Size < 8) {
         SDValue AddPtr = PtrOff;
         if (!isLittleEndian) {
           SDValue Const = DAG.getConstant(PtrByteSize - Size, dl,
                                           PtrOff.getValueType());
           AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
         }
         Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
                                                           CallSeqStart,
                                                           Flags, DAG, dl);
         ArgOffset += PtrByteSize;
         continue;
       }
       // Copy entire object into memory.  There are cases where gcc-generated
       // code assumes it is there, even if it could be put entirely into
       // registers.  (This is not what the doc says.)
 
       // FIXME: The above statement is likely due to a misunderstanding of the
       // documents.  All arguments must be copied into the parameter area BY
       // THE CALLEE in the event that the callee takes the address of any
       // formal argument.  That has not yet been implemented.  However, it is
       // reasonable to use the stack area as a staging area for the register
       // load.
 
       // Skip this for small aggregates, as we will use the same slot for a
       // right-justified copy, below.
       if (Size >= 8)
         Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, PtrOff,
                                                           CallSeqStart,
                                                           Flags, DAG, dl);
 
       // When a register is available, pass a small aggregate right-justified.
       if (Size < 8 && GPR_idx != NumGPRs) {
         // The easiest way to get this right-justified in a register
         // is to copy the structure into the rightmost portion of a
         // local variable slot, then load the whole slot into the
         // register.
         // FIXME: The memcpy seems to produce pretty awful code for
         // small aggregates, particularly for packed ones.
         // FIXME: It would be preferable to use the slot in the
         // parameter save area instead of a new local variable.
         SDValue AddPtr = PtrOff;
         if (!isLittleEndian) {
           SDValue Const = DAG.getConstant(8 - Size, dl, PtrOff.getValueType());
           AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
         }
         Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
                                                           CallSeqStart,
                                                           Flags, DAG, dl);
 
         // Load the slot into the register.
         SDValue Load =
             DAG.getLoad(PtrVT, dl, Chain, PtrOff, MachinePointerInfo());
         MemOpChains.push_back(Load.getValue(1));
         RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
 
         // Done with this argument.
         ArgOffset += PtrByteSize;
         continue;
       }
 
       // For aggregates larger than PtrByteSize, copy the pieces of the
       // object that fit into registers from the parameter save area.
       for (unsigned j=0; j<Size; j+=PtrByteSize) {
         SDValue Const = DAG.getConstant(j, dl, PtrOff.getValueType());
         SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
         if (GPR_idx != NumGPRs) {
           SDValue Load =
               DAG.getLoad(PtrVT, dl, Chain, AddArg, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
           ArgOffset += PtrByteSize;
         } else {
           ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
           break;
         }
       }
       continue;
     }
 
     switch (Arg.getSimpleValueType().SimpleTy) {
     default: llvm_unreachable("Unexpected ValueType for argument!");
     case MVT::i1:
     case MVT::i32:
     case MVT::i64:
       if (Flags.isNest()) {
         // The 'nest' parameter, if any, is passed in R11.
         RegsToPass.push_back(std::make_pair(PPC::X11, Arg));
         hasNest = true;
         break;
       }
 
       // These can be scalar arguments or elements of an integer array type
       // passed directly.  Clang may use those instead of "byval" aggregate
       // types to avoid forcing arguments to memory unnecessarily.
       if (GPR_idx != NumGPRs) {
         RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
       } else {
         if (CallConv == CallingConv::Fast)
           ComputePtrOff();
 
         assert(HasParameterArea &&
                "Parameter area must exist to pass an argument in memory.");
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          true, isTailCall, false, MemOpChains,
                          TailCallArguments, dl);
         if (CallConv == CallingConv::Fast)
           ArgOffset += PtrByteSize;
       }
       if (CallConv != CallingConv::Fast)
         ArgOffset += PtrByteSize;
       break;
     case MVT::f32:
     case MVT::f64: {
       // These can be scalar arguments or elements of a float array type
       // passed directly.  The latter are used to implement ELFv2 homogenous
       // float aggregates.
 
       // Named arguments go into FPRs first, and once they overflow, the
       // remaining arguments go into GPRs and then the parameter save area.
       // Unnamed arguments for vararg functions always go to GPRs and
       // then the parameter save area.  For now, put all arguments to vararg
       // routines always in both locations (FPR *and* GPR or stack slot).
       bool NeedGPROrStack = isVarArg || FPR_idx == NumFPRs;
       bool NeededLoad = false;
 
       // First load the argument into the next available FPR.
       if (FPR_idx != NumFPRs)
         RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
 
       // Next, load the argument into GPR or stack slot if needed.
       if (!NeedGPROrStack)
         ;
       else if (GPR_idx != NumGPRs && CallConv != CallingConv::Fast) {
         // FIXME: We may want to re-enable this for CallingConv::Fast on the P8
         // once we support fp <-> gpr moves.
 
         // In the non-vararg case, this can only ever happen in the
         // presence of f32 array types, since otherwise we never run
         // out of FPRs before running out of GPRs.
         SDValue ArgVal;
 
         // Double values are always passed in a single GPR.
         if (Arg.getValueType() != MVT::f32) {
           ArgVal = DAG.getNode(ISD::BITCAST, dl, MVT::i64, Arg);
 
         // Non-array float values are extended and passed in a GPR.
         } else if (!Flags.isInConsecutiveRegs()) {
           ArgVal = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg);
           ArgVal = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i64, ArgVal);
 
         // If we have an array of floats, we collect every odd element
         // together with its predecessor into one GPR.
         } else if (ArgOffset % PtrByteSize != 0) {
           SDValue Lo, Hi;
           Lo = DAG.getNode(ISD::BITCAST, dl, MVT::i32, OutVals[i - 1]);
           Hi = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg);
           if (!isLittleEndian)
             std::swap(Lo, Hi);
           ArgVal = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
 
         // The final element, if even, goes into the first half of a GPR.
         } else if (Flags.isInConsecutiveRegsLast()) {
           ArgVal = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg);
           ArgVal = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i64, ArgVal);
           if (!isLittleEndian)
             ArgVal = DAG.getNode(ISD::SHL, dl, MVT::i64, ArgVal,
                                  DAG.getConstant(32, dl, MVT::i32));
 
         // Non-final even elements are skipped; they will be handled
         // together the with subsequent argument on the next go-around.
         } else
           ArgVal = SDValue();
 
         if (ArgVal.getNode())
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], ArgVal));
       } else {
         if (CallConv == CallingConv::Fast)
           ComputePtrOff();
 
         // Single-precision floating-point values are mapped to the
         // second (rightmost) word of the stack doubleword.
         if (Arg.getValueType() == MVT::f32 &&
             !isLittleEndian && !Flags.isInConsecutiveRegs()) {
           SDValue ConstFour = DAG.getConstant(4, dl, PtrOff.getValueType());
           PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
         }
 
         assert(HasParameterArea &&
                "Parameter area must exist to pass an argument in memory.");
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          true, isTailCall, false, MemOpChains,
                          TailCallArguments, dl);
 
         NeededLoad = true;
       }
       // When passing an array of floats, the array occupies consecutive
       // space in the argument area; only round up to the next doubleword
       // at the end of the array.  Otherwise, each float takes 8 bytes.
       if (CallConv != CallingConv::Fast || NeededLoad) {
         ArgOffset += (Arg.getValueType() == MVT::f32 &&
                       Flags.isInConsecutiveRegs()) ? 4 : 8;
         if (Flags.isInConsecutiveRegsLast())
           ArgOffset = ((ArgOffset + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
       }
       break;
     }
     case MVT::v4f32:
     case MVT::v4i32:
     case MVT::v8i16:
     case MVT::v16i8:
     case MVT::v2f64:
     case MVT::v2i64:
     case MVT::v1i128:
     case MVT::f128:
       if (!Subtarget.hasQPX()) {
       // These can be scalar arguments or elements of a vector array type
       // passed directly.  The latter are used to implement ELFv2 homogenous
       // vector aggregates.
 
       // For a varargs call, named arguments go into VRs or on the stack as
       // usual; unnamed arguments always go to the stack or the corresponding
       // GPRs when within range.  For now, we always put the value in both
       // locations (or even all three).
       if (isVarArg) {
         assert(HasParameterArea &&
                "Parameter area must exist if we have a varargs call.");
         // We could elide this store in the case where the object fits
         // entirely in R registers.  Maybe later.
         SDValue Store =
             DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo());
         MemOpChains.push_back(Store);
         if (VR_idx != NumVRs) {
           SDValue Load =
               DAG.getLoad(MVT::v4f32, dl, Store, PtrOff, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
         }
         ArgOffset += 16;
         for (unsigned i=0; i<16; i+=PtrByteSize) {
           if (GPR_idx == NumGPRs)
             break;
           SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
                                    DAG.getConstant(i, dl, PtrVT));
           SDValue Load =
               DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
         }
         break;
       }
 
       // Non-varargs Altivec params go into VRs or on the stack.
       if (VR_idx != NumVRs) {
         RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
       } else {
         if (CallConv == CallingConv::Fast)
           ComputePtrOff();
 
         assert(HasParameterArea &&
                "Parameter area must exist to pass an argument in memory.");
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          true, isTailCall, true, MemOpChains,
                          TailCallArguments, dl);
         if (CallConv == CallingConv::Fast)
           ArgOffset += 16;
       }
 
       if (CallConv != CallingConv::Fast)
         ArgOffset += 16;
       break;
       } // not QPX
 
       assert(Arg.getValueType().getSimpleVT().SimpleTy == MVT::v4f32 &&
              "Invalid QPX parameter type");
 
       LLVM_FALLTHROUGH;
     case MVT::v4f64:
     case MVT::v4i1: {
       bool IsF32 = Arg.getValueType().getSimpleVT().SimpleTy == MVT::v4f32;
       if (isVarArg) {
         assert(HasParameterArea &&
                "Parameter area must exist if we have a varargs call.");
         // We could elide this store in the case where the object fits
         // entirely in R registers.  Maybe later.
         SDValue Store =
             DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo());
         MemOpChains.push_back(Store);
         if (QFPR_idx != NumQFPRs) {
           SDValue Load = DAG.getLoad(IsF32 ? MVT::v4f32 : MVT::v4f64, dl, Store,
                                      PtrOff, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(QFPR[QFPR_idx++], Load));
         }
         ArgOffset += (IsF32 ? 16 : 32);
         for (unsigned i = 0; i < (IsF32 ? 16U : 32U); i += PtrByteSize) {
           if (GPR_idx == NumGPRs)
             break;
           SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
                                    DAG.getConstant(i, dl, PtrVT));
           SDValue Load =
               DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
         }
         break;
       }
 
       // Non-varargs QPX params go into registers or on the stack.
       if (QFPR_idx != NumQFPRs) {
         RegsToPass.push_back(std::make_pair(QFPR[QFPR_idx++], Arg));
       } else {
         if (CallConv == CallingConv::Fast)
           ComputePtrOff();
 
         assert(HasParameterArea &&
                "Parameter area must exist to pass an argument in memory.");
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          true, isTailCall, true, MemOpChains,
                          TailCallArguments, dl);
         if (CallConv == CallingConv::Fast)
           ArgOffset += (IsF32 ? 16 : 32);
       }
 
       if (CallConv != CallingConv::Fast)
         ArgOffset += (IsF32 ? 16 : 32);
       break;
       }
     }
   }
 
   assert((!HasParameterArea || NumBytesActuallyUsed == ArgOffset) &&
          "mismatch in size of parameter area");
   (void)NumBytesActuallyUsed;
 
   if (!MemOpChains.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
 
   // Check if this is an indirect call (MTCTR/BCTRL).
   // See prepareDescriptorIndirectCall and buildCallOperands for more
   // information about calls through function pointers in the 64-bit SVR4 ABI.
   if (!isTailCall && !isPatchPoint &&
       !isFunctionGlobalAddress(Callee) &&
       !isa<ExternalSymbolSDNode>(Callee)) {
     // Load r2 into a virtual register and store it to the TOC save area.
     setUsesTOCBasePtr(DAG);
     SDValue Val = DAG.getCopyFromReg(Chain, dl, PPC::X2, MVT::i64);
     // TOC save area offset.
     unsigned TOCSaveOffset = Subtarget.getFrameLowering()->getTOCSaveOffset();
     SDValue PtrOff = DAG.getIntPtrConstant(TOCSaveOffset, dl);
     SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
     Chain = DAG.getStore(
         Val.getValue(1), dl, Val, AddPtr,
         MachinePointerInfo::getStack(DAG.getMachineFunction(), TOCSaveOffset));
     // In the ELFv2 ABI, R12 must contain the address of an indirect callee.
     // This does not mean the MTCTR instruction must use R12; it's easier
     // to model this as an extra parameter, so do that.
     if (isELFv2ABI && !isPatchPoint)
       RegsToPass.push_back(std::make_pair((unsigned)PPC::X12, Callee));
   }
 
   // Build a sequence of copy-to-reg nodes chained together with token chain
   // and flag operands which copy the outgoing args into the appropriate regs.
   SDValue InFlag;
   for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
     Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
                              RegsToPass[i].second, InFlag);
     InFlag = Chain.getValue(1);
   }
 
   if (isTailCall && !IsSibCall)
     PrepareTailCall(DAG, InFlag, Chain, dl, SPDiff, NumBytes, LROp, FPOp,
                     TailCallArguments);
 
   return FinishCall(CallConv, dl, isTailCall, isVarArg, isPatchPoint, hasNest,
                     DAG, RegsToPass, InFlag, Chain, CallSeqStart, Callee,
                     SPDiff, NumBytes, Ins, InVals, CS);
 }
 
 SDValue PPCTargetLowering::LowerCall_Darwin(
     SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg,
     bool isTailCall, bool isPatchPoint,
     const SmallVectorImpl<ISD::OutputArg> &Outs,
     const SmallVectorImpl<SDValue> &OutVals,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
     ImmutableCallSite CS) const {
   unsigned NumOps = Outs.size();
 
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   bool isPPC64 = PtrVT == MVT::i64;
   unsigned PtrByteSize = isPPC64 ? 8 : 4;
 
   MachineFunction &MF = DAG.getMachineFunction();
 
   // Mark this function as potentially containing a function that contains a
   // tail call. As a consequence the frame pointer will be used for dynamicalloc
   // and restoring the callers stack pointer in this functions epilog. This is
   // done because by tail calling the called function might overwrite the value
   // in this function's (MF) stack pointer stack slot 0(SP).
   if (getTargetMachine().Options.GuaranteedTailCallOpt &&
       CallConv == CallingConv::Fast)
     MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
 
   // Count how many bytes are to be pushed on the stack, including the linkage
   // area, and parameter passing area.  We start with 24/48 bytes, which is
   // prereserved space for [SP][CR][LR][3 x unused].
   unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   unsigned NumBytes = LinkageSize;
 
   // Add up all the space actually used.
   // In 32-bit non-varargs calls, Altivec parameters all go at the end; usually
   // they all go in registers, but we must reserve stack space for them for
   // possible use by the caller.  In varargs or 64-bit calls, parameters are
   // assigned stack space in order, with padding so Altivec parameters are
   // 16-byte aligned.
   unsigned nAltivecParamsAtEnd = 0;
   for (unsigned i = 0; i != NumOps; ++i) {
     ISD::ArgFlagsTy Flags = Outs[i].Flags;
     EVT ArgVT = Outs[i].VT;
     // Varargs Altivec parameters are padded to a 16 byte boundary.
     if (ArgVT == MVT::v4f32 || ArgVT == MVT::v4i32 ||
         ArgVT == MVT::v8i16 || ArgVT == MVT::v16i8 ||
         ArgVT == MVT::v2f64 || ArgVT == MVT::v2i64) {
       if (!isVarArg && !isPPC64) {
         // Non-varargs Altivec parameters go after all the non-Altivec
         // parameters; handle those later so we know how much padding we need.
         nAltivecParamsAtEnd++;
         continue;
       }
       // Varargs and 64-bit Altivec parameters are padded to 16 byte boundary.
       NumBytes = ((NumBytes+15)/16)*16;
     }
     NumBytes += CalculateStackSlotSize(ArgVT, Flags, PtrByteSize);
   }
 
   // Allow for Altivec parameters at the end, if needed.
   if (nAltivecParamsAtEnd) {
     NumBytes = ((NumBytes+15)/16)*16;
     NumBytes += 16*nAltivecParamsAtEnd;
   }
 
   // The prolog code of the callee may store up to 8 GPR argument registers to
   // the stack, allowing va_start to index over them in memory if its varargs.
   // Because we cannot tell if this is needed on the caller side, we have to
   // conservatively assume that it is needed.  As such, make sure we have at
   // least enough stack space for the caller to store the 8 GPRs.
   NumBytes = std::max(NumBytes, LinkageSize + 8 * PtrByteSize);
 
   // Tail call needs the stack to be aligned.
   if (getTargetMachine().Options.GuaranteedTailCallOpt &&
       CallConv == CallingConv::Fast)
     NumBytes = EnsureStackAlignment(Subtarget.getFrameLowering(), NumBytes);
 
   // Calculate by how many bytes the stack has to be adjusted in case of tail
   // call optimization.
   int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
 
   // To protect arguments on the stack from being clobbered in a tail call,
   // force all the loads to happen before doing any other lowering.
   if (isTailCall)
     Chain = DAG.getStackArgumentTokenFactor(Chain);
 
   // Adjust the stack pointer for the new arguments...
   // These operations are automatically eliminated by the prolog/epilog pass
   Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl);
   SDValue CallSeqStart = Chain;
 
   // Load the return address and frame pointer so it can be move somewhere else
   // later.
   SDValue LROp, FPOp;
   Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, dl);
 
   // Set up a copy of the stack pointer for use loading and storing any
   // arguments that may not fit in the registers available for argument
   // passing.
   SDValue StackPtr;
   if (isPPC64)
     StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
   else
     StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
 
   // Figure out which arguments are going to go in registers, and which in
   // memory.  Also, if this is a vararg function, floating point operations
   // must be stored to our stack, and loaded into integer regs as well, if
   // any integer regs are available for argument passing.
   unsigned ArgOffset = LinkageSize;
   unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
 
   static const MCPhysReg GPR_32[] = {           // 32-bit registers.
     PPC::R3, PPC::R4, PPC::R5, PPC::R6,
     PPC::R7, PPC::R8, PPC::R9, PPC::R10,
   };
   static const MCPhysReg GPR_64[] = {           // 64-bit registers.
     PPC::X3, PPC::X4, PPC::X5, PPC::X6,
     PPC::X7, PPC::X8, PPC::X9, PPC::X10,
   };
   static const MCPhysReg VR[] = {
     PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
     PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
   };
   const unsigned NumGPRs = array_lengthof(GPR_32);
   const unsigned NumFPRs = 13;
   const unsigned NumVRs  = array_lengthof(VR);
 
   const MCPhysReg *GPR = isPPC64 ? GPR_64 : GPR_32;
 
   SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
   SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
 
   SmallVector<SDValue, 8> MemOpChains;
   for (unsigned i = 0; i != NumOps; ++i) {
     SDValue Arg = OutVals[i];
     ISD::ArgFlagsTy Flags = Outs[i].Flags;
 
     // PtrOff will be used to store the current argument to the stack if a
     // register cannot be found for it.
     SDValue PtrOff;
 
     PtrOff = DAG.getConstant(ArgOffset, dl, StackPtr.getValueType());
 
     PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
 
     // On PPC64, promote integers to 64-bit values.
     if (isPPC64 && Arg.getValueType() == MVT::i32) {
       // FIXME: Should this use ANY_EXTEND if neither sext nor zext?
       unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
       Arg = DAG.getNode(ExtOp, dl, MVT::i64, Arg);
     }
 
     // FIXME memcpy is used way more than necessary.  Correctness first.
     // Note: "by value" is code for passing a structure by value, not
     // basic types.
     if (Flags.isByVal()) {
       unsigned Size = Flags.getByValSize();
       // Very small objects are passed right-justified.  Everything else is
       // passed left-justified.
       if (Size==1 || Size==2) {
         EVT VT = (Size==1) ? MVT::i8 : MVT::i16;
         if (GPR_idx != NumGPRs) {
           SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, PtrVT, Chain, Arg,
                                         MachinePointerInfo(), VT);
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
 
           ArgOffset += PtrByteSize;
         } else {
           SDValue Const = DAG.getConstant(PtrByteSize - Size, dl,
                                           PtrOff.getValueType());
           SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
           Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
                                                             CallSeqStart,
                                                             Flags, DAG, dl);
           ArgOffset += PtrByteSize;
         }
         continue;
       }
       // Copy entire object into memory.  There are cases where gcc-generated
       // code assumes it is there, even if it could be put entirely into
       // registers.  (This is not what the doc says.)
       Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, PtrOff,
                                                         CallSeqStart,
                                                         Flags, DAG, dl);
 
       // For small aggregates (Darwin only) and aggregates >= PtrByteSize,
       // copy the pieces of the object that fit into registers from the
       // parameter save area.
       for (unsigned j=0; j<Size; j+=PtrByteSize) {
         SDValue Const = DAG.getConstant(j, dl, PtrOff.getValueType());
         SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
         if (GPR_idx != NumGPRs) {
           SDValue Load =
               DAG.getLoad(PtrVT, dl, Chain, AddArg, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
           ArgOffset += PtrByteSize;
         } else {
           ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
           break;
         }
       }
       continue;
     }
 
     switch (Arg.getSimpleValueType().SimpleTy) {
     default: llvm_unreachable("Unexpected ValueType for argument!");
     case MVT::i1:
     case MVT::i32:
     case MVT::i64:
       if (GPR_idx != NumGPRs) {
         if (Arg.getValueType() == MVT::i1)
           Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, PtrVT, Arg);
 
         RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
       } else {
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          isPPC64, isTailCall, false, MemOpChains,
                          TailCallArguments, dl);
       }
       ArgOffset += PtrByteSize;
       break;
     case MVT::f32:
     case MVT::f64:
       if (FPR_idx != NumFPRs) {
         RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
 
         if (isVarArg) {
           SDValue Store =
               DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo());
           MemOpChains.push_back(Store);
 
           // Float varargs are always shadowed in available integer registers
           if (GPR_idx != NumGPRs) {
             SDValue Load =
                 DAG.getLoad(PtrVT, dl, Store, PtrOff, MachinePointerInfo());
             MemOpChains.push_back(Load.getValue(1));
             RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
           }
           if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64){
             SDValue ConstFour = DAG.getConstant(4, dl, PtrOff.getValueType());
             PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
             SDValue Load =
                 DAG.getLoad(PtrVT, dl, Store, PtrOff, MachinePointerInfo());
             MemOpChains.push_back(Load.getValue(1));
             RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
           }
         } else {
           // If we have any FPRs remaining, we may also have GPRs remaining.
           // Args passed in FPRs consume either 1 (f32) or 2 (f64) available
           // GPRs.
           if (GPR_idx != NumGPRs)
             ++GPR_idx;
           if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 &&
               !isPPC64)  // PPC64 has 64-bit GPR's obviously :)
             ++GPR_idx;
         }
       } else
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          isPPC64, isTailCall, false, MemOpChains,
                          TailCallArguments, dl);
       if (isPPC64)
         ArgOffset += 8;
       else
         ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
       break;
     case MVT::v4f32:
     case MVT::v4i32:
     case MVT::v8i16:
     case MVT::v16i8:
       if (isVarArg) {
         // These go aligned on the stack, or in the corresponding R registers
         // when within range.  The Darwin PPC ABI doc claims they also go in
         // V registers; in fact gcc does this only for arguments that are
         // prototyped, not for those that match the ...  We do it for all
         // arguments, seems to work.
         while (ArgOffset % 16 !=0) {
           ArgOffset += PtrByteSize;
           if (GPR_idx != NumGPRs)
             GPR_idx++;
         }
         // We could elide this store in the case where the object fits
         // entirely in R registers.  Maybe later.
         PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
                              DAG.getConstant(ArgOffset, dl, PtrVT));
         SDValue Store =
             DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo());
         MemOpChains.push_back(Store);
         if (VR_idx != NumVRs) {
           SDValue Load =
               DAG.getLoad(MVT::v4f32, dl, Store, PtrOff, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
         }
         ArgOffset += 16;
         for (unsigned i=0; i<16; i+=PtrByteSize) {
           if (GPR_idx == NumGPRs)
             break;
           SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
                                    DAG.getConstant(i, dl, PtrVT));
           SDValue Load =
               DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo());
           MemOpChains.push_back(Load.getValue(1));
           RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
         }
         break;
       }
 
       // Non-varargs Altivec params generally go in registers, but have
       // stack space allocated at the end.
       if (VR_idx != NumVRs) {
         // Doesn't have GPR space allocated.
         RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
       } else if (nAltivecParamsAtEnd==0) {
         // We are emitting Altivec params in order.
         LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                          isPPC64, isTailCall, true, MemOpChains,
                          TailCallArguments, dl);
         ArgOffset += 16;
       }
       break;
     }
   }
   // If all Altivec parameters fit in registers, as they usually do,
   // they get stack space following the non-Altivec parameters.  We
   // don't track this here because nobody below needs it.
   // If there are more Altivec parameters than fit in registers emit
   // the stores here.
   if (!isVarArg && nAltivecParamsAtEnd > NumVRs) {
     unsigned j = 0;
     // Offset is aligned; skip 1st 12 params which go in V registers.
     ArgOffset = ((ArgOffset+15)/16)*16;
     ArgOffset += 12*16;
     for (unsigned i = 0; i != NumOps; ++i) {
       SDValue Arg = OutVals[i];
       EVT ArgType = Outs[i].VT;
       if (ArgType==MVT::v4f32 || ArgType==MVT::v4i32 ||
           ArgType==MVT::v8i16 || ArgType==MVT::v16i8) {
         if (++j > NumVRs) {
           SDValue PtrOff;
           // We are emitting Altivec params in order.
           LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
                            isPPC64, isTailCall, true, MemOpChains,
                            TailCallArguments, dl);
           ArgOffset += 16;
         }
       }
     }
   }
 
   if (!MemOpChains.empty())
     Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
 
   // On Darwin, R12 must contain the address of an indirect callee.  This does
   // not mean the MTCTR instruction must use R12; it's easier to model this as
   // an extra parameter, so do that.
   if (!isTailCall &&
       !isFunctionGlobalAddress(Callee) &&
       !isa<ExternalSymbolSDNode>(Callee) &&
       !isBLACompatibleAddress(Callee, DAG))
     RegsToPass.push_back(std::make_pair((unsigned)(isPPC64 ? PPC::X12 :
                                                    PPC::R12), Callee));
 
   // Build a sequence of copy-to-reg nodes chained together with token chain
   // and flag operands which copy the outgoing args into the appropriate regs.
   SDValue InFlag;
   for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
     Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
                              RegsToPass[i].second, InFlag);
     InFlag = Chain.getValue(1);
   }
 
   if (isTailCall)
     PrepareTailCall(DAG, InFlag, Chain, dl, SPDiff, NumBytes, LROp, FPOp,
                     TailCallArguments);
 
   return FinishCall(CallConv, dl, isTailCall, isVarArg, isPatchPoint,
                     /* unused except on PPC64 ELFv1 */ false, DAG,
                     RegsToPass, InFlag, Chain, CallSeqStart, Callee, SPDiff,
                     NumBytes, Ins, InVals, CS);
 }
 
 static bool CC_AIX(unsigned ValNo, MVT ValVT, MVT LocVT,
                    CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags,
                    CCState &State) {
 
   if (ValVT == MVT::f128)
     report_fatal_error("f128 is unimplemented on AIX.");
 
   if (ArgFlags.isByVal())
     report_fatal_error("Passing structure by value is unimplemented.");
 
   if (ArgFlags.isNest())
     report_fatal_error("Nest arguments are unimplemented.");
 
   if (ValVT.isVector() || LocVT.isVector())
     report_fatal_error("Vector arguments are unimplemented on AIX.");
 
   const PPCSubtarget &Subtarget = static_cast<const PPCSubtarget &>(
       State.getMachineFunction().getSubtarget());
   const bool IsPPC64 = Subtarget.isPPC64();
   const unsigned PtrByteSize = IsPPC64 ? 8 : 4;
 
   static const MCPhysReg GPR_32[] = {// 32-bit registers.
                                      PPC::R3, PPC::R4, PPC::R5, PPC::R6,
                                      PPC::R7, PPC::R8, PPC::R9, PPC::R10};
   static const MCPhysReg GPR_64[] = {// 64-bit registers.
                                      PPC::X3, PPC::X4, PPC::X5, PPC::X6,
                                      PPC::X7, PPC::X8, PPC::X9, PPC::X10};
 
   // Arguments always reserve parameter save area.
   switch (ValVT.SimpleTy) {
   default:
     report_fatal_error("Unhandled value type for argument.");
   case MVT::i64:
     // i64 arguments should have been split to i32 for PPC32.
     assert(IsPPC64 && "PPC32 should have split i64 values.");
     LLVM_FALLTHROUGH;
   case MVT::i1:
   case MVT::i32:
     State.AllocateStack(PtrByteSize, PtrByteSize);
     if (unsigned Reg = State.AllocateReg(IsPPC64 ? GPR_64 : GPR_32)) {
       MVT RegVT = IsPPC64 ? MVT::i64 : MVT::i32;
       // Promote integers if needed.
       if (ValVT.getSizeInBits() < RegVT.getSizeInBits())
         LocInfo = ArgFlags.isSExt() ? CCValAssign::LocInfo::SExt
                                     : CCValAssign::LocInfo::ZExt;
       State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, RegVT, LocInfo));
     }
     else
       report_fatal_error("Handling of placing parameters on the stack is "
                          "unimplemented!");
     return false;
 
   case MVT::f32:
   case MVT::f64: {
     // Parameter save area (PSA) is reserved even if the float passes in fpr.
     const unsigned StoreSize = LocVT.getStoreSize();
     // Floats are always 4-byte aligned in the PSA on AIX.
     // This includes f64 in 64-bit mode for ABI compatibility.
     State.AllocateStack(IsPPC64 ? 8 : StoreSize, 4);
     if (unsigned Reg = State.AllocateReg(FPR))
       State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
     else
       report_fatal_error("Handling of placing parameters on the stack is "
                          "unimplemented!");
 
     // AIX requires that GPRs are reserved for float arguments.
     // Successfully reserved GPRs are only initialized for vararg calls.
     MVT RegVT = IsPPC64 ? MVT::i64 : MVT::i32;
     for (unsigned I = 0; I < StoreSize; I += PtrByteSize) {
       if (unsigned Reg = State.AllocateReg(IsPPC64 ? GPR_64 : GPR_32)) {
         if (State.isVarArg()) {
           // Custom handling is required for:
           //   f64 in PPC32 needs to be split into 2 GPRs.
           //   f32 in PPC64 needs to occupy only lower 32 bits of 64-bit GPR.
           State.addLoc(
               CCValAssign::getCustomReg(ValNo, ValVT, Reg, RegVT, LocInfo));
         }
       } else if (State.isVarArg()) {
         report_fatal_error("Handling of placing parameters on the stack is "
                            "unimplemented!");
       }
     }
 
     return false;
   }
   }
   return true;
 }
 
 static const TargetRegisterClass *getRegClassForSVT(MVT::SimpleValueType SVT,
                                                     bool IsPPC64) {
   assert((IsPPC64 || SVT != MVT::i64) &&
          "i64 should have been split for 32-bit codegen.");
 
   switch (SVT) {
   default:
     report_fatal_error("Unexpected value type for formal argument");
   case MVT::i1:
   case MVT::i32:
   case MVT::i64:
     return IsPPC64 ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
   case MVT::f32:
     return &PPC::F4RCRegClass;
   case MVT::f64:
     return &PPC::F8RCRegClass;
   }
 }
 
 static SDValue truncateScalarIntegerArg(ISD::ArgFlagsTy Flags, EVT ValVT,
                                         SelectionDAG &DAG, SDValue ArgValue,
                                         MVT LocVT, const SDLoc &dl) {
   assert(ValVT.isScalarInteger() && LocVT.isScalarInteger());
   assert(ValVT.getSizeInBits() < LocVT.getSizeInBits());
 
   if (Flags.isSExt())
     ArgValue = DAG.getNode(ISD::AssertSext, dl, LocVT, ArgValue,
                            DAG.getValueType(ValVT));
   else if (Flags.isZExt())
     ArgValue = DAG.getNode(ISD::AssertZext, dl, LocVT, ArgValue,
                            DAG.getValueType(ValVT));
 
   return DAG.getNode(ISD::TRUNCATE, dl, ValVT, ArgValue);
 }
 
 SDValue PPCTargetLowering::LowerFormalArguments_AIX(
     SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
 
   assert((CallConv == CallingConv::C || CallConv == CallingConv::Cold ||
           CallConv == CallingConv::Fast) &&
          "Unexpected calling convention!");
 
   if (isVarArg)
     report_fatal_error("This call type is unimplemented on AIX.");
 
   if (getTargetMachine().Options.GuaranteedTailCallOpt)
     report_fatal_error("Tail call support is unimplemented on AIX.");
 
   if (useSoftFloat())
     report_fatal_error("Soft float support is unimplemented on AIX.");
 
   const PPCSubtarget &Subtarget =
       static_cast<const PPCSubtarget &>(DAG.getSubtarget());
   if (Subtarget.hasQPX())
     report_fatal_error("QPX support is not supported on AIX.");
 
   const bool IsPPC64 = Subtarget.isPPC64();
   const unsigned PtrByteSize = IsPPC64 ? 8 : 4;
 
   // Assign locations to all of the incoming arguments.
   SmallVector<CCValAssign, 16> ArgLocs;
   MachineFunction &MF = DAG.getMachineFunction();
   CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
 
   // Reserve space for the linkage area on the stack.
   const unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   // On AIX a minimum of 8 words is saved to the parameter save area.
   const unsigned MinParameterSaveArea = 8 * PtrByteSize;
   CCInfo.AllocateStack(LinkageSize + MinParameterSaveArea, PtrByteSize);
   CCInfo.AnalyzeFormalArguments(Ins, CC_AIX);
 
   for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
     CCValAssign &VA = ArgLocs[i];
     SDValue ArgValue;
     ISD::ArgFlagsTy Flags = Ins[i].Flags;
     if (VA.isRegLoc()) {
       EVT ValVT = VA.getValVT();
       MVT LocVT = VA.getLocVT();
       MVT::SimpleValueType SVT = ValVT.getSimpleVT().SimpleTy;
       unsigned VReg =
           MF.addLiveIn(VA.getLocReg(), getRegClassForSVT(SVT, IsPPC64));
       ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, LocVT);
       if (ValVT.isScalarInteger() &&
           (ValVT.getSizeInBits() < LocVT.getSizeInBits())) {
         ArgValue =
             truncateScalarIntegerArg(Flags, ValVT, DAG, ArgValue, LocVT, dl);
       }
       InVals.push_back(ArgValue);
     } else {
       report_fatal_error("Handling of formal arguments on the stack is "
                          "unimplemented!");
     }
   }
 
   // Area that is at least reserved in the caller of this function.
   unsigned MinReservedArea = CCInfo.getNextStackOffset();
 
   // Set the size that is at least reserved in caller of this function. Tail
   // call optimized function's reserved stack space needs to be aligned so
   // that taking the difference between two stack areas will result in an
   // aligned stack.
   MinReservedArea =
       EnsureStackAlignment(Subtarget.getFrameLowering(), MinReservedArea);
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
   FuncInfo->setMinReservedArea(MinReservedArea);
 
   return Chain;
 }
 
 SDValue PPCTargetLowering::LowerCall_AIX(
     SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg,
     bool isTailCall, bool isPatchPoint,
     const SmallVectorImpl<ISD::OutputArg> &Outs,
     const SmallVectorImpl<SDValue> &OutVals,
     const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
     SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals,
     ImmutableCallSite CS) const {
 
   assert((CallConv == CallingConv::C ||
           CallConv == CallingConv::Cold ||
           CallConv == CallingConv::Fast) && "Unexpected calling convention!");
 
   if (isPatchPoint)
     report_fatal_error("This call type is unimplemented on AIX.");
 
   const PPCSubtarget& Subtarget =
       static_cast<const PPCSubtarget&>(DAG.getSubtarget());
   if (Subtarget.hasQPX())
     report_fatal_error("QPX is not supported on AIX.");
   if (Subtarget.hasAltivec())
     report_fatal_error("Altivec support is unimplemented on AIX.");
 
   MachineFunction &MF = DAG.getMachineFunction();
   SmallVector<CCValAssign, 16> ArgLocs;
   CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
 
   // Reserve space for the linkage save area (LSA) on the stack.
   // In both PPC32 and PPC64 there are 6 reserved slots in the LSA:
   //   [SP][CR][LR][2 x reserved][TOC].
   // The LSA is 24 bytes (6x4) in PPC32 and 48 bytes (6x8) in PPC64.
   const unsigned LinkageSize = Subtarget.getFrameLowering()->getLinkageSize();
   const bool IsPPC64 = Subtarget.isPPC64();
   const unsigned PtrByteSize = IsPPC64 ? 8 : 4;
   CCInfo.AllocateStack(LinkageSize, PtrByteSize);
   CCInfo.AnalyzeCallOperands(Outs, CC_AIX);
 
   // The prolog code of the callee may store up to 8 GPR argument registers to
   // the stack, allowing va_start to index over them in memory if the callee
   // is variadic.
   // Because we cannot tell if this is needed on the caller side, we have to
   // conservatively assume that it is needed.  As such, make sure we have at
   // least enough stack space for the caller to store the 8 GPRs.
   const unsigned MinParameterSaveAreaSize = 8 * PtrByteSize;
   const unsigned NumBytes = LinkageSize + MinParameterSaveAreaSize;
 
   // Adjust the stack pointer for the new arguments...
   // These operations are automatically eliminated by the prolog/epilog pass.
   Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl);
   SDValue CallSeqStart = Chain;
 
   SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
 
   for (unsigned I = 0, E = ArgLocs.size(); I != E;) {
     CCValAssign &VA = ArgLocs[I++];
 
     if (VA.isMemLoc())
       report_fatal_error("Handling of placing parameters on the stack is "
                          "unimplemented!");
     if (!VA.isRegLoc())
       report_fatal_error(
           "Unexpected non-register location for function call argument.");
 
     SDValue Arg = OutVals[VA.getValNo()];
 
     if (!VA.needsCustom()) {
       switch (VA.getLocInfo()) {
       default:
         report_fatal_error("Unexpected argument extension type.");
       case CCValAssign::Full:
         break;
       case CCValAssign::ZExt:
         Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
         break;
       case CCValAssign::SExt:
         Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
         break;
       }
       RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
 
       continue;
     }
 
     // Custom handling is used for GPR initializations for vararg float
     // arguments.
     assert(isVarArg && VA.getValVT().isFloatingPoint() &&
            VA.getLocVT().isInteger() &&
            "Unexpected custom register handling for calling convention.");
 
     SDValue ArgAsInt =
         DAG.getBitcast(MVT::getIntegerVT(VA.getValVT().getSizeInBits()), Arg);
 
     if (Arg.getValueType().getStoreSize() == VA.getLocVT().getStoreSize())
       // f32 in 32-bit GPR
       // f64 in 64-bit GPR
       RegsToPass.push_back(std::make_pair(VA.getLocReg(), ArgAsInt));
     else if (Arg.getValueType().getSizeInBits() < VA.getLocVT().getSizeInBits())
       // f32 in 64-bit GPR.
       RegsToPass.push_back(std::make_pair(
           VA.getLocReg(), DAG.getZExtOrTrunc(ArgAsInt, dl, VA.getLocVT())));
     else {
       // f64 in two 32-bit GPRs
       // The 2 GPRs are marked custom and expected to be adjacent in ArgLocs.
       assert(Arg.getValueType() == MVT::f64 && isVarArg && !IsPPC64 &&
              "Unexpected custom register for argument!");
       CCValAssign &GPR1 = VA;
       SDValue MSWAsI64 = DAG.getNode(ISD::SRL, dl, MVT::i64, ArgAsInt,
                                      DAG.getConstant(32, dl, MVT::i8));
       RegsToPass.push_back(std::make_pair(
           GPR1.getLocReg(), DAG.getZExtOrTrunc(MSWAsI64, dl, MVT::i32)));
       assert(I != E && "A second custom GPR is expected!");
       CCValAssign &GPR2 = ArgLocs[I++];
       assert(GPR2.isRegLoc() && GPR2.getValNo() == GPR1.getValNo() &&
              GPR2.needsCustom() && "A second custom GPR is expected!");
       RegsToPass.push_back(std::make_pair(
           GPR2.getLocReg(), DAG.getZExtOrTrunc(ArgAsInt, dl, MVT::i32)));
     }
   }
 
   // For indirect calls, we need to save the TOC base to the stack for
   // restoration after the call.
   if (!isTailCall && !isPatchPoint &&
       !isFunctionGlobalAddress(Callee) && !isa<ExternalSymbolSDNode>(Callee)) {
     const MCRegister TOCBaseReg = Subtarget.getTOCPointerRegister();
     const MCRegister StackPtrReg = Subtarget.getStackPointerRegister();
     const MVT PtrVT = Subtarget.isPPC64() ? MVT::i64 : MVT::i32;
     const unsigned TOCSaveOffset =
         Subtarget.getFrameLowering()->getTOCSaveOffset();
 
     setUsesTOCBasePtr(DAG);
     SDValue Val = DAG.getCopyFromReg(Chain, dl, TOCBaseReg, PtrVT);
     SDValue PtrOff = DAG.getIntPtrConstant(TOCSaveOffset, dl);
     SDValue StackPtr = DAG.getRegister(StackPtrReg, PtrVT);
     SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
     Chain = DAG.getStore(
         Val.getValue(1), dl, Val, AddPtr,
         MachinePointerInfo::getStack(DAG.getMachineFunction(), TOCSaveOffset));
   }
 
   // Build a sequence of copy-to-reg nodes chained together with token chain
   // and flag operands which copy the outgoing args into the appropriate regs.
   SDValue InFlag;
   for (auto Reg : RegsToPass) {
     Chain = DAG.getCopyToReg(Chain, dl, Reg.first, Reg.second, InFlag);
     InFlag = Chain.getValue(1);
   }
 
   const int SPDiff = 0;
   return FinishCall(CallConv, dl, isTailCall, isVarArg, isPatchPoint,
                     /* unused except on PPC64 ELFv1 */ false, DAG, RegsToPass,
                     InFlag, Chain, CallSeqStart, Callee, SPDiff, NumBytes, Ins,
                     InVals, CS);
 }
 
 bool
 PPCTargetLowering::CanLowerReturn(CallingConv::ID CallConv,
                                   MachineFunction &MF, bool isVarArg,
                                   const SmallVectorImpl<ISD::OutputArg> &Outs,
                                   LLVMContext &Context) const {
   SmallVector<CCValAssign, 16> RVLocs;
   CCState CCInfo(CallConv, isVarArg, MF, RVLocs, Context);
   return CCInfo.CheckReturn(
       Outs, (Subtarget.isSVR4ABI() && CallConv == CallingConv::Cold)
                 ? RetCC_PPC_Cold
                 : RetCC_PPC);
 }
 
 SDValue
 PPCTargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
                                bool isVarArg,
                                const SmallVectorImpl<ISD::OutputArg> &Outs,
                                const SmallVectorImpl<SDValue> &OutVals,
                                const SDLoc &dl, SelectionDAG &DAG) const {
   SmallVector<CCValAssign, 16> RVLocs;
   CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
                  *DAG.getContext());
   CCInfo.AnalyzeReturn(Outs,
                        (Subtarget.isSVR4ABI() && CallConv == CallingConv::Cold)
                            ? RetCC_PPC_Cold
                            : RetCC_PPC);
 
   SDValue Flag;
   SmallVector<SDValue, 4> RetOps(1, Chain);
 
   // Copy the result values into the output registers.
   for (unsigned i = 0, RealResIdx = 0; i != RVLocs.size(); ++i, ++RealResIdx) {
     CCValAssign &VA = RVLocs[i];
     assert(VA.isRegLoc() && "Can only return in registers!");
 
     SDValue Arg = OutVals[RealResIdx];
 
     switch (VA.getLocInfo()) {
     default: llvm_unreachable("Unknown loc info!");
     case CCValAssign::Full: break;
     case CCValAssign::AExt:
       Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
       break;
     case CCValAssign::ZExt:
       Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
       break;
     case CCValAssign::SExt:
       Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
       break;
     }
     if (Subtarget.hasSPE() && VA.getLocVT() == MVT::f64) {
       bool isLittleEndian = Subtarget.isLittleEndian();
       // Legalize ret f64 -> ret 2 x i32.
       SDValue SVal =
           DAG.getNode(PPCISD::EXTRACT_SPE, dl, MVT::i32, Arg,
                       DAG.getIntPtrConstant(isLittleEndian ? 0 : 1, dl));
       Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), SVal, Flag);
       RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
       SVal = DAG.getNode(PPCISD::EXTRACT_SPE, dl, MVT::i32, Arg,
                          DAG.getIntPtrConstant(isLittleEndian ? 1 : 0, dl));
       Flag = Chain.getValue(1);
       VA = RVLocs[++i]; // skip ahead to next loc
       Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), SVal, Flag);
     } else
       Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
     Flag = Chain.getValue(1);
     RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
   }
 
   const PPCRegisterInfo *TRI = Subtarget.getRegisterInfo();
   const MCPhysReg *I =
     TRI->getCalleeSavedRegsViaCopy(&DAG.getMachineFunction());
   if (I) {
     for (; *I; ++I) {
 
       if (PPC::G8RCRegClass.contains(*I))
         RetOps.push_back(DAG.getRegister(*I, MVT::i64));
       else if (PPC::F8RCRegClass.contains(*I))
         RetOps.push_back(DAG.getRegister(*I, MVT::getFloatingPointVT(64)));
       else if (PPC::CRRCRegClass.contains(*I))
         RetOps.push_back(DAG.getRegister(*I, MVT::i1));
       else if (PPC::VRRCRegClass.contains(*I))
         RetOps.push_back(DAG.getRegister(*I, MVT::Other));
       else
         llvm_unreachable("Unexpected register class in CSRsViaCopy!");
     }
   }
 
   RetOps[0] = Chain;  // Update chain.
 
   // Add the flag if we have it.
   if (Flag.getNode())
     RetOps.push_back(Flag);
 
   return DAG.getNode(PPCISD::RET_FLAG, dl, MVT::Other, RetOps);
 }
 
 SDValue
 PPCTargetLowering::LowerGET_DYNAMIC_AREA_OFFSET(SDValue Op,
                                                 SelectionDAG &DAG) const {
   SDLoc dl(Op);
 
   // Get the correct type for integers.
   EVT IntVT = Op.getValueType();
 
   // Get the inputs.
   SDValue Chain = Op.getOperand(0);
   SDValue FPSIdx = getFramePointerFrameIndex(DAG);
   // Build a DYNAREAOFFSET node.
   SDValue Ops[2] = {Chain, FPSIdx};
   SDVTList VTs = DAG.getVTList(IntVT);
   return DAG.getNode(PPCISD::DYNAREAOFFSET, dl, VTs, Ops);
 }
 
 SDValue PPCTargetLowering::LowerSTACKRESTORE(SDValue Op,
                                              SelectionDAG &DAG) const {
   // When we pop the dynamic allocation we need to restore the SP link.
   SDLoc dl(Op);
 
   // Get the correct type for pointers.
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
 
   // Construct the stack pointer operand.
   bool isPPC64 = Subtarget.isPPC64();
   unsigned SP = isPPC64 ? PPC::X1 : PPC::R1;
   SDValue StackPtr = DAG.getRegister(SP, PtrVT);
 
   // Get the operands for the STACKRESTORE.
   SDValue Chain = Op.getOperand(0);
   SDValue SaveSP = Op.getOperand(1);
 
   // Load the old link SP.
   SDValue LoadLinkSP =
       DAG.getLoad(PtrVT, dl, Chain, StackPtr, MachinePointerInfo());
 
   // Restore the stack pointer.
   Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), dl, SP, SaveSP);
 
   // Store the old link SP.
   return DAG.getStore(Chain, dl, LoadLinkSP, StackPtr, MachinePointerInfo());
 }
 
 SDValue PPCTargetLowering::getReturnAddrFrameIndex(SelectionDAG &DAG) const {
   MachineFunction &MF = DAG.getMachineFunction();
   bool isPPC64 = Subtarget.isPPC64();
   EVT PtrVT = getPointerTy(MF.getDataLayout());
 
   // Get current frame pointer save index.  The users of this index will be
   // primarily DYNALLOC instructions.
   PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
   int RASI = FI->getReturnAddrSaveIndex();
 
   // If the frame pointer save index hasn't been defined yet.
   if (!RASI) {
     // Find out what the fix offset of the frame pointer save area.
     int LROffset = Subtarget.getFrameLowering()->getReturnSaveOffset();
     // Allocate the frame index for frame pointer save area.
     RASI = MF.getFrameInfo().CreateFixedObject(isPPC64? 8 : 4, LROffset, false);
     // Save the result.
     FI->setReturnAddrSaveIndex(RASI);
   }
   return DAG.getFrameIndex(RASI, PtrVT);
 }
 
 SDValue
 PPCTargetLowering::getFramePointerFrameIndex(SelectionDAG & DAG) const {
   MachineFunction &MF = DAG.getMachineFunction();
   bool isPPC64 = Subtarget.isPPC64();
   EVT PtrVT = getPointerTy(MF.getDataLayout());
 
   // Get current frame pointer save index.  The users of this index will be
   // primarily DYNALLOC instructions.
   PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
   int FPSI = FI->getFramePointerSaveIndex();
 
   // If the frame pointer save index hasn't been defined yet.
   if (!FPSI) {
     // Find out what the fix offset of the frame pointer save area.
     int FPOffset = Subtarget.getFrameLowering()->getFramePointerSaveOffset();
     // Allocate the frame index for frame pointer save area.
     FPSI = MF.getFrameInfo().CreateFixedObject(isPPC64? 8 : 4, FPOffset, true);
     // Save the result.
     FI->setFramePointerSaveIndex(FPSI);
   }
   return DAG.getFrameIndex(FPSI, PtrVT);
 }
 
 SDValue PPCTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
                                                    SelectionDAG &DAG) const {
   // Get the inputs.
   SDValue Chain = Op.getOperand(0);
   SDValue Size  = Op.getOperand(1);
   SDLoc dl(Op);
 
   // Get the correct type for pointers.
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   // Negate the size.
   SDValue NegSize = DAG.getNode(ISD::SUB, dl, PtrVT,
                                 DAG.getConstant(0, dl, PtrVT), Size);
   // Construct a node for the frame pointer save index.
   SDValue FPSIdx = getFramePointerFrameIndex(DAG);
   // Build a DYNALLOC node.
   SDValue Ops[3] = { Chain, NegSize, FPSIdx };
   SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
   return DAG.getNode(PPCISD::DYNALLOC, dl, VTs, Ops);
 }
 
 SDValue PPCTargetLowering::LowerEH_DWARF_CFA(SDValue Op,
                                                      SelectionDAG &DAG) const {
   MachineFunction &MF = DAG.getMachineFunction();
 
   bool isPPC64 = Subtarget.isPPC64();
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
 
   int FI = MF.getFrameInfo().CreateFixedObject(isPPC64 ? 8 : 4, 0, false);
   return DAG.getFrameIndex(FI, PtrVT);
 }
 
 SDValue PPCTargetLowering::lowerEH_SJLJ_SETJMP(SDValue Op,
                                                SelectionDAG &DAG) const {
   SDLoc DL(Op);
   return DAG.getNode(PPCISD::EH_SJLJ_SETJMP, DL,
                      DAG.getVTList(MVT::i32, MVT::Other),
                      Op.getOperand(0), Op.getOperand(1));
 }
 
 SDValue PPCTargetLowering::lowerEH_SJLJ_LONGJMP(SDValue Op,
                                                 SelectionDAG &DAG) const {
   SDLoc DL(Op);
   return DAG.getNode(PPCISD::EH_SJLJ_LONGJMP, DL, MVT::Other,
                      Op.getOperand(0), Op.getOperand(1));
 }
 
 SDValue PPCTargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
   if (Op.getValueType().isVector())
     return LowerVectorLoad(Op, DAG);
 
   assert(Op.getValueType() == MVT::i1 &&
          "Custom lowering only for i1 loads");
 
   // First, load 8 bits into 32 bits, then truncate to 1 bit.
 
   SDLoc dl(Op);
   LoadSDNode *LD = cast<LoadSDNode>(Op);
 
   SDValue Chain = LD->getChain();
   SDValue BasePtr = LD->getBasePtr();
   MachineMemOperand *MMO = LD->getMemOperand();
 
   SDValue NewLD =
       DAG.getExtLoad(ISD::EXTLOAD, dl, getPointerTy(DAG.getDataLayout()), Chain,
                      BasePtr, MVT::i8, MMO);
   SDValue Result = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, NewLD);
 
   SDValue Ops[] = { Result, SDValue(NewLD.getNode(), 1) };
   return DAG.getMergeValues(Ops, dl);
 }
 
 SDValue PPCTargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
   if (Op.getOperand(1).getValueType().isVector())
     return LowerVectorStore(Op, DAG);
 
   assert(Op.getOperand(1).getValueType() == MVT::i1 &&
          "Custom lowering only for i1 stores");
 
   // First, zero extend to 32 bits, then use a truncating store to 8 bits.
 
   SDLoc dl(Op);
   StoreSDNode *ST = cast<StoreSDNode>(Op);
 
   SDValue Chain = ST->getChain();
   SDValue BasePtr = ST->getBasePtr();
   SDValue Value = ST->getValue();
   MachineMemOperand *MMO = ST->getMemOperand();
 
   Value = DAG.getNode(ISD::ZERO_EXTEND, dl, getPointerTy(DAG.getDataLayout()),
                       Value);
   return DAG.getTruncStore(Chain, dl, Value, BasePtr, MVT::i8, MMO);
 }
 
 // FIXME: Remove this once the ANDI glue bug is fixed:
 SDValue PPCTargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const {
   assert(Op.getValueType() == MVT::i1 &&
          "Custom lowering only for i1 results");
 
   SDLoc DL(Op);
   return DAG.getNode(PPCISD::ANDI_rec_1_GT_BIT, DL, MVT::i1, Op.getOperand(0));
 }
 
 SDValue PPCTargetLowering::LowerTRUNCATEVector(SDValue Op,
                                                SelectionDAG &DAG) const {
 
   // Implements a vector truncate that fits in a vector register as a shuffle.
   // We want to legalize vector truncates down to where the source fits in
   // a vector register (and target is therefore smaller than vector register
   // size).  At that point legalization will try to custom lower the sub-legal
   // result and get here - where we can contain the truncate as a single target
   // operation.
 
   // For example a trunc <2 x i16> to <2 x i8> could be visualized as follows:
   //   <MSB1|LSB1, MSB2|LSB2> to <LSB1, LSB2>
   //
   // We will implement it for big-endian ordering as this (where x denotes
   // undefined):
   //   < MSB1|LSB1, MSB2|LSB2, uu, uu, uu, uu, uu, uu> to
   //   < LSB1, LSB2, u, u, u, u, u, u, u, u, u, u, u, u, u, u>
   //
   // The same operation in little-endian ordering will be:
   //   <uu, uu, uu, uu, uu, uu, LSB2|MSB2, LSB1|MSB1> to
   //   <u, u, u, u, u, u, u, u, u, u, u, u, u, u, LSB2, LSB1>
 
   assert(Op.getValueType().isVector() && "Vector type expected.");
 
   SDLoc DL(Op);
   SDValue N1 = Op.getOperand(0);
   unsigned SrcSize = N1.getValueType().getSizeInBits();
   assert(SrcSize <= 128 && "Source must fit in an Altivec/VSX vector");
   SDValue WideSrc = SrcSize == 128 ? N1 : widenVec(DAG, N1, DL);
 
   EVT TrgVT = Op.getValueType();
   unsigned TrgNumElts = TrgVT.getVectorNumElements();
   EVT EltVT = TrgVT.getVectorElementType();
   unsigned WideNumElts = 128 / EltVT.getSizeInBits();
   EVT WideVT = EVT::getVectorVT(*DAG.getContext(), EltVT, WideNumElts);
 
   // First list the elements we want to keep.
   unsigned SizeMult = SrcSize / TrgVT.getSizeInBits();
   SmallVector<int, 16> ShuffV;
   if (Subtarget.isLittleEndian())
     for (unsigned i = 0; i < TrgNumElts; ++i)
       ShuffV.push_back(i * SizeMult);
   else
     for (unsigned i = 1; i <= TrgNumElts; ++i)
       ShuffV.push_back(i * SizeMult - 1);
 
   // Populate the remaining elements with undefs.
   for (unsigned i = TrgNumElts; i < WideNumElts; ++i)
     // ShuffV.push_back(i + WideNumElts);
     ShuffV.push_back(WideNumElts + 1);
 
   SDValue Conv = DAG.getNode(ISD::BITCAST, DL, WideVT, WideSrc);
   return DAG.getVectorShuffle(WideVT, DL, Conv, DAG.getUNDEF(WideVT), ShuffV);
 }
 
 /// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
 /// possible.
 SDValue PPCTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
   // Not FP? Not a fsel.
   if (!Op.getOperand(0).getValueType().isFloatingPoint() ||
       !Op.getOperand(2).getValueType().isFloatingPoint())
     return Op;
 
   bool HasNoInfs = DAG.getTarget().Options.NoInfsFPMath;
   bool HasNoNaNs = DAG.getTarget().Options.NoNaNsFPMath;
   // We might be able to do better than this under some circumstances, but in
   // general, fsel-based lowering of select is a finite-math-only optimization.
   // For more information, see section F.3 of the 2.06 ISA specification.
   // With ISA 3.0, we have xsmaxcdp/xsmincdp which are OK to emit even in the
   // presence of infinities.
   if (!Subtarget.hasP9Vector() && (!HasNoInfs || !HasNoNaNs))
     return Op;
   ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
 
   EVT ResVT = Op.getValueType();
   EVT CmpVT = Op.getOperand(0).getValueType();
   SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
   SDValue TV  = Op.getOperand(2), FV  = Op.getOperand(3);
   SDLoc dl(Op);
 
   if (Subtarget.hasP9Vector() && LHS == TV && RHS == FV) {
     switch (CC) {
     default:
       // Not a min/max but with finite math, we may still be able to use fsel.
       if (HasNoInfs && HasNoNaNs)
         break;
       return Op;
     case ISD::SETOGT:
     case ISD::SETGT:
       return DAG.getNode(PPCISD::XSMAXCDP, dl, Op.getValueType(), LHS, RHS);
     case ISD::SETOLT:
     case ISD::SETLT:
       return DAG.getNode(PPCISD::XSMINCDP, dl, Op.getValueType(), LHS, RHS);
     }
   }
 
   // TODO: Propagate flags from the select rather than global settings.
   SDNodeFlags Flags;
   Flags.setNoInfs(true);
   Flags.setNoNaNs(true);
 
   // If the RHS of the comparison is a 0.0, we don't need to do the
   // subtraction at all.
   SDValue Sel1;
   if (isFloatingPointZero(RHS))
     switch (CC) {
     default: break;       // SETUO etc aren't handled by fsel.
     case ISD::SETNE:
       std::swap(TV, FV);
       LLVM_FALLTHROUGH;
     case ISD::SETEQ:
       if (LHS.getValueType() == MVT::f32)   // Comparison is always 64-bits
         LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
       Sel1 = DAG.getNode(PPCISD::FSEL, dl, ResVT, LHS, TV, FV);
       if (Sel1.getValueType() == MVT::f32)   // Comparison is always 64-bits
         Sel1 = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Sel1);
       return DAG.getNode(PPCISD::FSEL, dl, ResVT,
                          DAG.getNode(ISD::FNEG, dl, MVT::f64, LHS), Sel1, FV);
     case ISD::SETULT:
     case ISD::SETLT:
       std::swap(TV, FV);  // fsel is natively setge, swap operands for setlt
       LLVM_FALLTHROUGH;
     case ISD::SETOGE:
     case ISD::SETGE:
       if (LHS.getValueType() == MVT::f32)   // Comparison is always 64-bits
         LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
       return DAG.getNode(PPCISD::FSEL, dl, ResVT, LHS, TV, FV);
     case ISD::SETUGT:
     case ISD::SETGT:
       std::swap(TV, FV);  // fsel is natively setge, swap operands for setlt
       LLVM_FALLTHROUGH;
     case ISD::SETOLE:
     case ISD::SETLE:
       if (LHS.getValueType() == MVT::f32)   // Comparison is always 64-bits
         LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
       return DAG.getNode(PPCISD::FSEL, dl, ResVT,
                          DAG.getNode(ISD::FNEG, dl, MVT::f64, LHS), TV, FV);
     }
 
   SDValue Cmp;
   switch (CC) {
   default: break;       // SETUO etc aren't handled by fsel.
   case ISD::SETNE:
     std::swap(TV, FV);
     LLVM_FALLTHROUGH;
   case ISD::SETEQ:
     Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS, Flags);
     if (Cmp.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
     Sel1 = DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
     if (Sel1.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Sel1 = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Sel1);
     return DAG.getNode(PPCISD::FSEL, dl, ResVT,
                        DAG.getNode(ISD::FNEG, dl, MVT::f64, Cmp), Sel1, FV);
   case ISD::SETULT:
   case ISD::SETLT:
     Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS, Flags);
     if (Cmp.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
     return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
   case ISD::SETOGE:
   case ISD::SETGE:
     Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS, Flags);
     if (Cmp.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
     return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
   case ISD::SETUGT:
   case ISD::SETGT:
     Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS, Flags);
     if (Cmp.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
     return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
   case ISD::SETOLE:
   case ISD::SETLE:
     Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS, Flags);
     if (Cmp.getValueType() == MVT::f32)   // Comparison is always 64-bits
       Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
     return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
   }
   return Op;
 }
 
 void PPCTargetLowering::LowerFP_TO_INTForReuse(SDValue Op, ReuseLoadInfo &RLI,
                                                SelectionDAG &DAG,
                                                const SDLoc &dl) const {
   assert(Op.getOperand(0).getValueType().isFloatingPoint());
   SDValue Src = Op.getOperand(0);
   if (Src.getValueType() == MVT::f32)
     Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
 
   SDValue Tmp;
   switch (Op.getSimpleValueType().SimpleTy) {
   default: llvm_unreachable("Unhandled FP_TO_INT type in custom expander!");
   case MVT::i32:
     Tmp = DAG.getNode(
         Op.getOpcode() == ISD::FP_TO_SINT
             ? PPCISD::FCTIWZ
             : (Subtarget.hasFPCVT() ? PPCISD::FCTIWUZ : PPCISD::FCTIDZ),
         dl, MVT::f64, Src);
     break;
   case MVT::i64:
     assert((Op.getOpcode() == ISD::FP_TO_SINT || Subtarget.hasFPCVT()) &&
            "i64 FP_TO_UINT is supported only with FPCVT");
     Tmp = DAG.getNode(Op.getOpcode()==ISD::FP_TO_SINT ? PPCISD::FCTIDZ :
                                                         PPCISD::FCTIDUZ,
                       dl, MVT::f64, Src);
     break;
   }
 
   // Convert the FP value to an int value through memory.
   bool i32Stack = Op.getValueType() == MVT::i32 && Subtarget.hasSTFIWX() &&
     (Op.getOpcode() == ISD::FP_TO_SINT || Subtarget.hasFPCVT());
   SDValue FIPtr = DAG.CreateStackTemporary(i32Stack ? MVT::i32 : MVT::f64);
   int FI = cast<FrameIndexSDNode>(FIPtr)->getIndex();
   MachinePointerInfo MPI =
       MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI);
 
   // Emit a store to the stack slot.
   SDValue Chain;
   if (i32Stack) {
     MachineFunction &MF = DAG.getMachineFunction();
     MachineMemOperand *MMO =
       MF.getMachineMemOperand(MPI, MachineMemOperand::MOStore, 4, 4);
     SDValue Ops[] = { DAG.getEntryNode(), Tmp, FIPtr };
     Chain = DAG.getMemIntrinsicNode(PPCISD::STFIWX, dl,
               DAG.getVTList(MVT::Other), Ops, MVT::i32, MMO);
   } else
     Chain = DAG.getStore(DAG.getEntryNode(), dl, Tmp, FIPtr, MPI);
 
   // Result is a load from the stack slot.  If loading 4 bytes, make sure to
   // add in a bias on big endian.
   if (Op.getValueType() == MVT::i32 && !i32Stack) {
     FIPtr = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr,
                         DAG.getConstant(4, dl, FIPtr.getValueType()));
     MPI = MPI.getWithOffset(Subtarget.isLittleEndian() ? 0 : 4);
   }
 
   RLI.Chain = Chain;
   RLI.Ptr = FIPtr;
   RLI.MPI = MPI;
 }
 
 /// Custom lowers floating point to integer conversions to use
 /// the direct move instructions available in ISA 2.07 to avoid the
 /// need for load/store combinations.
 SDValue PPCTargetLowering::LowerFP_TO_INTDirectMove(SDValue Op,
                                                     SelectionDAG &DAG,
                                                     const SDLoc &dl) const {
   assert(Op.getOperand(0).getValueType().isFloatingPoint());
   SDValue Src = Op.getOperand(0);
 
   if (Src.getValueType() == MVT::f32)
     Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
 
   SDValue Tmp;
   switch (Op.getSimpleValueType().SimpleTy) {
   default: llvm_unreachable("Unhandled FP_TO_INT type in custom expander!");
   case MVT::i32:
     Tmp = DAG.getNode(
         Op.getOpcode() == ISD::FP_TO_SINT
             ? PPCISD::FCTIWZ
             : (Subtarget.hasFPCVT() ? PPCISD::FCTIWUZ : PPCISD::FCTIDZ),
         dl, MVT::f64, Src);
     Tmp = DAG.getNode(PPCISD::MFVSR, dl, MVT::i32, Tmp);
     break;
   case MVT::i64:
     assert((Op.getOpcode() == ISD::FP_TO_SINT || Subtarget.hasFPCVT()) &&
            "i64 FP_TO_UINT is supported only with FPCVT");
     Tmp = DAG.getNode(Op.getOpcode()==ISD::FP_TO_SINT ? PPCISD::FCTIDZ :
                                                         PPCISD::FCTIDUZ,
                       dl, MVT::f64, Src);
     Tmp = DAG.getNode(PPCISD::MFVSR, dl, MVT::i64, Tmp);
     break;
   }
   return Tmp;
 }
 
 SDValue PPCTargetLowering::LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG,
                                           const SDLoc &dl) const {
 
   // FP to INT conversions are legal for f128.
   if (EnableQuadPrecision && (Op->getOperand(0).getValueType() == MVT::f128))
     return Op;
 
   // Expand ppcf128 to i32 by hand for the benefit of llvm-gcc bootstrap on
   // PPC (the libcall is not available).
   if (Op.getOperand(0).getValueType() == MVT::ppcf128) {
     if (Op.getValueType() == MVT::i32) {
       if (Op.getOpcode() == ISD::FP_TO_SINT) {
         SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
                                  MVT::f64, Op.getOperand(0),
                                  DAG.getIntPtrConstant(0, dl));
         SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
                                  MVT::f64, Op.getOperand(0),
                                  DAG.getIntPtrConstant(1, dl));
 
         // Add the two halves of the long double in round-to-zero mode.
         SDValue Res = DAG.getNode(PPCISD::FADDRTZ, dl, MVT::f64, Lo, Hi);
 
         // Now use a smaller FP_TO_SINT.
         return DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, Res);
       }
       if (Op.getOpcode() == ISD::FP_TO_UINT) {
         const uint64_t TwoE31[] = {0x41e0000000000000LL, 0};
         APFloat APF = APFloat(APFloat::PPCDoubleDouble(), APInt(128, TwoE31));
         SDValue Tmp = DAG.getConstantFP(APF, dl, MVT::ppcf128);
         //  X>=2^31 ? (int)(X-2^31)+0x80000000 : (int)X
         // FIXME: generated code sucks.
         // TODO: Are there fast-math-flags to propagate to this FSUB?
         SDValue True = DAG.getNode(ISD::FSUB, dl, MVT::ppcf128,
                                    Op.getOperand(0), Tmp);
         True = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, True);
         True = DAG.getNode(ISD::ADD, dl, MVT::i32, True,
                            DAG.getConstant(0x80000000, dl, MVT::i32));
         SDValue False = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32,
                                     Op.getOperand(0));
         return DAG.getSelectCC(dl, Op.getOperand(0), Tmp, True, False,
                                ISD::SETGE);
       }
     }
 
     return SDValue();
   }
 
   if (Subtarget.hasDirectMove() && Subtarget.isPPC64())
     return LowerFP_TO_INTDirectMove(Op, DAG, dl);
 
   ReuseLoadInfo RLI;
   LowerFP_TO_INTForReuse(Op, RLI, DAG, dl);
 
   return DAG.getLoad(Op.getValueType(), dl, RLI.Chain, RLI.Ptr, RLI.MPI,
                      RLI.Alignment, RLI.MMOFlags(), RLI.AAInfo, RLI.Ranges);
 }
 
 // We're trying to insert a regular store, S, and then a load, L. If the
 // incoming value, O, is a load, we might just be able to have our load use the
 // address used by O. However, we don't know if anything else will store to
 // that address before we can load from it. To prevent this situation, we need
 // to insert our load, L, into the chain as a peer of O. To do this, we give L
 // the same chain operand as O, we create a token factor from the chain results
 // of O and L, and we replace all uses of O's chain result with that token
 // factor (see spliceIntoChain below for this last part).
 bool PPCTargetLowering::canReuseLoadAddress(SDValue Op, EVT MemVT,
                                             ReuseLoadInfo &RLI,
                                             SelectionDAG &DAG,
                                             ISD::LoadExtType ET) const {
   SDLoc dl(Op);
+  bool ValidFPToUint = Op.getOpcode() == ISD::FP_TO_UINT &&
+                       (Subtarget.hasFPCVT() || Op.getValueType() == MVT::i32);
   if (ET == ISD::NON_EXTLOAD &&
-      (Op.getOpcode() == ISD::FP_TO_UINT ||
-       Op.getOpcode() == ISD::FP_TO_SINT) &&
+      (ValidFPToUint || Op.getOpcode() == ISD::FP_TO_SINT) &&
       isOperationLegalOrCustom(Op.getOpcode(),
                                Op.getOperand(0).getValueType())) {
 
     LowerFP_TO_INTForReuse(Op, RLI, DAG, dl);
     return true;
   }
 
   LoadSDNode *LD = dyn_cast<LoadSDNode>(Op);
   if (!LD || LD->getExtensionType() != ET || LD->isVolatile() ||
       LD->isNonTemporal())
     return false;
   if (LD->getMemoryVT() != MemVT)
     return false;
 
   RLI.Ptr = LD->getBasePtr();
   if (LD->isIndexed() && !LD->getOffset().isUndef()) {
     assert(LD->getAddressingMode() == ISD::PRE_INC &&
            "Non-pre-inc AM on PPC?");
     RLI.Ptr = DAG.getNode(ISD::ADD, dl, RLI.Ptr.getValueType(), RLI.Ptr,
                           LD->getOffset());
   }
 
   RLI.Chain = LD->getChain();
   RLI.MPI = LD->getPointerInfo();
   RLI.IsDereferenceable = LD->isDereferenceable();
   RLI.IsInvariant = LD->isInvariant();
   RLI.Alignment = LD->getAlignment();
   RLI.AAInfo = LD->getAAInfo();
   RLI.Ranges = LD->getRanges();
 
   RLI.ResChain = SDValue(LD, LD->isIndexed() ? 2 : 1);
   return true;
 }
 
 // Given the head of the old chain, ResChain, insert a token factor containing
 // it and NewResChain, and make users of ResChain now be users of that token
 // factor.
 // TODO: Remove and use DAG::makeEquivalentMemoryOrdering() instead.
 void PPCTargetLowering::spliceIntoChain(SDValue ResChain,
                                         SDValue NewResChain,
                                         SelectionDAG &DAG) const {
   if (!ResChain)
     return;
 
   SDLoc dl(NewResChain);
 
   SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
                            NewResChain, DAG.getUNDEF(MVT::Other));
   assert(TF.getNode() != NewResChain.getNode() &&
          "A new TF really is required here");
 
   DAG.ReplaceAllUsesOfValueWith(ResChain, TF);
   DAG.UpdateNodeOperands(TF.getNode(), ResChain, NewResChain);
 }
 
 /// Analyze profitability of direct move
 /// prefer float load to int load plus direct move
 /// when there is no integer use of int load
 bool PPCTargetLowering::directMoveIsProfitable(const SDValue &Op) const {
   SDNode *Origin = Op.getOperand(0).getNode();
   if (Origin->getOpcode() != ISD::LOAD)
     return true;
 
   // If there is no LXSIBZX/LXSIHZX, like Power8,
   // prefer direct move if the memory size is 1 or 2 bytes.
   MachineMemOperand *MMO = cast<LoadSDNode>(Origin)->getMemOperand();
   if (!Subtarget.hasP9Vector() && MMO->getSize() <= 2)
     return true;
 
   for (SDNode::use_iterator UI = Origin->use_begin(),
                             UE = Origin->use_end();
        UI != UE; ++UI) {
 
     // Only look at the users of the loaded value.
     if (UI.getUse().get().getResNo() != 0)
       continue;
 
     if (UI->getOpcode() != ISD::SINT_TO_FP &&
         UI->getOpcode() != ISD::UINT_TO_FP)
       return true;
   }
 
   return false;
 }
 
 /// Custom lowers integer to floating point conversions to use
 /// the direct move instructions available in ISA 2.07 to avoid the
 /// need for load/store combinations.
 SDValue PPCTargetLowering::LowerINT_TO_FPDirectMove(SDValue Op,
                                                     SelectionDAG &DAG,
                                                     const SDLoc &dl) const {
   assert((Op.getValueType() == MVT::f32 ||
           Op.getValueType() == MVT::f64) &&
          "Invalid floating point type as target of conversion");
   assert(Subtarget.hasFPCVT() &&
          "Int to FP conversions with direct moves require FPCVT");
   SDValue FP;
   SDValue Src = Op.getOperand(0);
   bool SinglePrec = Op.getValueType() == MVT::f32;
   bool WordInt = Src.getSimpleValueType().SimpleTy == MVT::i32;
   bool Signed = Op.getOpcode() == ISD::SINT_TO_FP;
   unsigned ConvOp = Signed ? (SinglePrec ? PPCISD::FCFIDS : PPCISD::FCFID) :
                              (SinglePrec ? PPCISD::FCFIDUS : PPCISD::FCFIDU);
 
   if (WordInt) {
     FP = DAG.getNode(Signed ? PPCISD::MTVSRA : PPCISD::MTVSRZ,
                      dl, MVT::f64, Src);
     FP = DAG.getNode(ConvOp, dl, SinglePrec ? MVT::f32 : MVT::f64, FP);
   }
   else {
     FP = DAG.getNode(PPCISD::MTVSRA, dl, MVT::f64, Src);
     FP = DAG.getNode(ConvOp, dl, SinglePrec ? MVT::f32 : MVT::f64, FP);
   }
 
   return FP;
 }
 
 static SDValue widenVec(SelectionDAG &DAG, SDValue Vec, const SDLoc &dl) {
 
   EVT VecVT = Vec.getValueType();
   assert(VecVT.isVector() && "Expected a vector type.");
   assert(VecVT.getSizeInBits() < 128 && "Vector is already full width.");
 
   EVT EltVT = VecVT.getVectorElementType();
   unsigned WideNumElts = 128 / EltVT.getSizeInBits();
   EVT WideVT = EVT::getVectorVT(*DAG.getContext(), EltVT, WideNumElts);
 
   unsigned NumConcat = WideNumElts / VecVT.getVectorNumElements();
   SmallVector<SDValue, 16> Ops(NumConcat);
   Ops[0] = Vec;
   SDValue UndefVec = DAG.getUNDEF(VecVT);
   for (unsigned i = 1; i < NumConcat; ++i)
     Ops[i] = UndefVec;
 
   return DAG.getNode(ISD::CONCAT_VECTORS, dl, WideVT, Ops);
 }
 
 SDValue PPCTargetLowering::LowerINT_TO_FPVector(SDValue Op, SelectionDAG &DAG,
                                                 const SDLoc &dl) const {
 
   unsigned Opc = Op.getOpcode();
   assert((Opc == ISD::UINT_TO_FP || Opc == ISD::SINT_TO_FP) &&
          "Unexpected conversion type");
   assert((Op.getValueType() == MVT::v2f64 || Op.getValueType() == MVT::v4f32) &&
          "Supports conversions to v2f64/v4f32 only.");
 
   bool SignedConv = Opc == ISD::SINT_TO_FP;
   bool FourEltRes = Op.getValueType() == MVT::v4f32;
 
   SDValue Wide = widenVec(DAG, Op.getOperand(0), dl);
   EVT WideVT = Wide.getValueType();
   unsigned WideNumElts = WideVT.getVectorNumElements();
   MVT IntermediateVT = FourEltRes ? MVT::v4i32 : MVT::v2i64;
 
   SmallVector<int, 16> ShuffV;
   for (unsigned i = 0; i < WideNumElts; ++i)
     ShuffV.push_back(i + WideNumElts);
 
   int Stride = FourEltRes ? WideNumElts / 4 : WideNumElts / 2;
   int SaveElts = FourEltRes ? 4 : 2;
   if (Subtarget.isLittleEndian())
     for (int i = 0; i < SaveElts; i++)
       ShuffV[i * Stride] = i;
   else
     for (int i = 1; i <= SaveElts; i++)
       ShuffV[i * Stride - 1] = i - 1;
 
   SDValue ShuffleSrc2 =
       SignedConv ? DAG.getUNDEF(WideVT) : DAG.getConstant(0, dl, WideVT);
   SDValue Arrange = DAG.getVectorShuffle(WideVT, dl, Wide, ShuffleSrc2, ShuffV);
   unsigned ExtendOp =
       SignedConv ? (unsigned)PPCISD::SExtVElems : (unsigned)ISD::BITCAST;
 
   SDValue Extend;
   if (!Subtarget.hasP9Altivec() && SignedConv) {
     Arrange = DAG.getBitcast(IntermediateVT, Arrange);
     Extend = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, IntermediateVT, Arrange,
                          DAG.getValueType(Op.getOperand(0).getValueType()));
   } else
     Extend = DAG.getNode(ExtendOp, dl, IntermediateVT, Arrange);
 
   return DAG.getNode(Opc, dl, Op.getValueType(), Extend);
 }
 
 SDValue PPCTargetLowering::LowerINT_TO_FP(SDValue Op,
                                           SelectionDAG &DAG) const {
   SDLoc dl(Op);
 
   EVT InVT = Op.getOperand(0).getValueType();
   EVT OutVT = Op.getValueType();
   if (OutVT.isVector() && OutVT.isFloatingPoint() &&
       isOperationCustom(Op.getOpcode(), InVT))
     return LowerINT_TO_FPVector(Op, DAG, dl);
 
   // Conversions to f128 are legal.
   if (EnableQuadPrecision && (Op.getValueType() == MVT::f128))
     return Op;
 
   if (Subtarget.hasQPX() && Op.getOperand(0).getValueType() == MVT::v4i1) {
     if (Op.getValueType() != MVT::v4f32 && Op.getValueType() != MVT::v4f64)
       return SDValue();
 
     SDValue Value = Op.getOperand(0);
     // The values are now known to be -1 (false) or 1 (true). To convert this
     // into 0 (false) and 1 (true), add 1 and then divide by 2 (multiply by 0.5).
     // This can be done with an fma and the 0.5 constant: (V+1.0)*0.5 = 0.5*V+0.5
     Value = DAG.getNode(PPCISD::QBFLT, dl, MVT::v4f64, Value);
 
     SDValue FPHalfs = DAG.getConstantFP(0.5, dl, MVT::v4f64);
 
     Value = DAG.getNode(ISD::FMA, dl, MVT::v4f64, Value, FPHalfs, FPHalfs);
 
     if (Op.getValueType() != MVT::v4f64)
       Value = DAG.getNode(ISD::FP_ROUND, dl,
                           Op.getValueType(), Value,
                           DAG.getIntPtrConstant(1, dl));
     return Value;
   }
 
   // Don't handle ppc_fp128 here; let it be lowered to a libcall.
   if (Op.getValueType() != MVT::f32 && Op.getValueType() != MVT::f64)
     return SDValue();
 
   if (Op.getOperand(0).getValueType() == MVT::i1)
     return DAG.getNode(ISD::SELECT, dl, Op.getValueType(), Op.getOperand(0),
                        DAG.getConstantFP(1.0, dl, Op.getValueType()),
                        DAG.getConstantFP(0.0, dl, Op.getValueType()));
 
   // If we have direct moves, we can do all the conversion, skip the store/load
   // however, without FPCVT we can't do most conversions.
   if (Subtarget.hasDirectMove() && directMoveIsProfitable(Op) &&
       Subtarget.isPPC64() && Subtarget.hasFPCVT())
     return LowerINT_TO_FPDirectMove(Op, DAG, dl);
 
   assert((Op.getOpcode() == ISD::SINT_TO_FP || Subtarget.hasFPCVT()) &&
          "UINT_TO_FP is supported only with FPCVT");
 
   // If we have FCFIDS, then use it when converting to single-precision.
   // Otherwise, convert to double-precision and then round.
   unsigned FCFOp = (Subtarget.hasFPCVT() && Op.getValueType() == MVT::f32)
                        ? (Op.getOpcode() == ISD::UINT_TO_FP ? PPCISD::FCFIDUS
                                                             : PPCISD::FCFIDS)
                        : (Op.getOpcode() == ISD::UINT_TO_FP ? PPCISD::FCFIDU
                                                             : PPCISD::FCFID);
   MVT FCFTy = (Subtarget.hasFPCVT() && Op.getValueType() == MVT::f32)
                   ? MVT::f32
                   : MVT::f64;
 
   if (Op.getOperand(0).getValueType() == MVT::i64) {
     SDValue SINT = Op.getOperand(0);
     // When converting to single-precision, we actually need to convert
     // to double-precision first and then round to single-precision.
     // To avoid double-rounding effects during that operation, we have
     // to prepare the input operand.  Bits that might be truncated when
     // converting to double-precision are replaced by a bit that won't
     // be lost at this stage, but is below the single-precision rounding
     // position.
     //
     // However, if -enable-unsafe-fp-math is in effect, accept double
     // rounding to avoid the extra overhead.
     if (Op.getValueType() == MVT::f32 &&
         !Subtarget.hasFPCVT() &&
         !DAG.getTarget().Options.UnsafeFPMath) {
 
       // Twiddle input to make sure the low 11 bits are zero.  (If this
       // is the case, we are guaranteed the value will fit into the 53 bit
       // mantissa of an IEEE double-precision value without rounding.)
       // If any of those low 11 bits were not zero originally, make sure
       // bit 12 (value 2048) is set instead, so that the final rounding
       // to single-precision gets the correct result.
       SDValue Round = DAG.getNode(ISD::AND, dl, MVT::i64,
                                   SINT, DAG.getConstant(2047, dl, MVT::i64));
       Round = DAG.getNode(ISD::ADD, dl, MVT::i64,
                           Round, DAG.getConstant(2047, dl, MVT::i64));
       Round = DAG.getNode(ISD::OR, dl, MVT::i64, Round, SINT);
       Round = DAG.getNode(ISD::AND, dl, MVT::i64,
                           Round, DAG.getConstant(-2048, dl, MVT::i64));
 
       // However, we cannot use that value unconditionally: if the magnitude
       // of the input value is small, the bit-twiddling we did above might
       // end up visibly changing the output.  Fortunately, in that case, we
       // don't need to twiddle bits since the original input will convert
       // exactly to double-precision floating-point already.  Therefore,
       // construct a conditional to use the original value if the top 11
       // bits are all sign-bit copies, and use the rounded value computed
       // above otherwise.
       SDValue Cond = DAG.getNode(ISD::SRA, dl, MVT::i64,
                                  SINT, DAG.getConstant(53, dl, MVT::i32));
       Cond = DAG.getNode(ISD::ADD, dl, MVT::i64,
                          Cond, DAG.getConstant(1, dl, MVT::i64));
       Cond = DAG.getSetCC(dl, MVT::i32,
                           Cond, DAG.getConstant(1, dl, MVT::i64), ISD::SETUGT);
 
       SINT = DAG.getNode(ISD::SELECT, dl, MVT::i64, Cond, Round, SINT);
     }
 
     ReuseLoadInfo RLI;
     SDValue Bits;
 
     MachineFunction &MF = DAG.getMachineFunction();
     if (canReuseLoadAddress(SINT, MVT::i64, RLI, DAG)) {
       Bits = DAG.getLoad(MVT::f64, dl, RLI.Chain, RLI.Ptr, RLI.MPI,
                          RLI.Alignment, RLI.MMOFlags(), RLI.AAInfo, RLI.Ranges);
       spliceIntoChain(RLI.ResChain, Bits.getValue(1), DAG);
     } else if (Subtarget.hasLFIWAX() &&
                canReuseLoadAddress(SINT, MVT::i32, RLI, DAG, ISD::SEXTLOAD)) {
       MachineMemOperand *MMO =
         MF.getMachineMemOperand(RLI.MPI, MachineMemOperand::MOLoad, 4,
                                 RLI.Alignment, RLI.AAInfo, RLI.Ranges);
       SDValue Ops[] = { RLI.Chain, RLI.Ptr };
       Bits = DAG.getMemIntrinsicNode(PPCISD::LFIWAX, dl,
                                      DAG.getVTList(MVT::f64, MVT::Other),
                                      Ops, MVT::i32, MMO);
       spliceIntoChain(RLI.ResChain, Bits.getValue(1), DAG);
     } else if (Subtarget.hasFPCVT() &&
                canReuseLoadAddress(SINT, MVT::i32, RLI, DAG, ISD::ZEXTLOAD)) {
       MachineMemOperand *MMO =
         MF.getMachineMemOperand(RLI.MPI, MachineMemOperand::MOLoad, 4,
                                 RLI.Alignment, RLI.AAInfo, RLI.Ranges);
       SDValue Ops[] = { RLI.Chain, RLI.Ptr };
       Bits = DAG.getMemIntrinsicNode(PPCISD::LFIWZX, dl,
                                      DAG.getVTList(MVT::f64, MVT::Other),
                                      Ops, MVT::i32, MMO);
       spliceIntoChain(RLI.ResChain, Bits.getValue(1), DAG);
     } else if (((Subtarget.hasLFIWAX() &&
                  SINT.getOpcode() == ISD::SIGN_EXTEND) ||
                 (Subtarget.hasFPCVT() &&
                  SINT.getOpcode() == ISD::ZERO_EXTEND)) &&
                SINT.getOperand(0).getValueType() == MVT::i32) {
       MachineFrameInfo &MFI = MF.getFrameInfo();
       EVT PtrVT = getPointerTy(DAG.getDataLayout());
 
       int FrameIdx = MFI.CreateStackObject(4, 4, false);
       SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
       SDValue Store =
           DAG.getStore(DAG.getEntryNode(), dl, SINT.getOperand(0), FIdx,
                        MachinePointerInfo::getFixedStack(
                            DAG.getMachineFunction(), FrameIdx));
 
       assert(cast<StoreSDNode>(Store)->getMemoryVT() == MVT::i32 &&
              "Expected an i32 store");
 
       RLI.Ptr = FIdx;
       RLI.Chain = Store;
       RLI.MPI =
           MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx);
       RLI.Alignment = 4;
 
       MachineMemOperand *MMO =
         MF.getMachineMemOperand(RLI.MPI, MachineMemOperand::MOLoad, 4,
                                 RLI.Alignment, RLI.AAInfo, RLI.Ranges);
       SDValue Ops[] = { RLI.Chain, RLI.Ptr };
       Bits = DAG.getMemIntrinsicNode(SINT.getOpcode() == ISD::ZERO_EXTEND ?
                                      PPCISD::LFIWZX : PPCISD::LFIWAX,
                                      dl, DAG.getVTList(MVT::f64, MVT::Other),
                                      Ops, MVT::i32, MMO);
     } else
       Bits = DAG.getNode(ISD::BITCAST, dl, MVT::f64, SINT);
 
     SDValue FP = DAG.getNode(FCFOp, dl, FCFTy, Bits);
 
     if (Op.getValueType() == MVT::f32 && !Subtarget.hasFPCVT())
       FP = DAG.getNode(ISD::FP_ROUND, dl,
                        MVT::f32, FP, DAG.getIntPtrConstant(0, dl));
     return FP;
   }
 
   assert(Op.getOperand(0).getValueType() == MVT::i32 &&
          "Unhandled INT_TO_FP type in custom expander!");
   // Since we only generate this in 64-bit mode, we can take advantage of
   // 64-bit registers.  In particular, sign extend the input value into the
   // 64-bit register with extsw, store the WHOLE 64-bit value into the stack
   // then lfd it and fcfid it.
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   EVT PtrVT = getPointerTy(MF.getDataLayout());
 
   SDValue Ld;
   if (Subtarget.hasLFIWAX() || Subtarget.hasFPCVT()) {
     ReuseLoadInfo RLI;
     bool ReusingLoad;
     if (!(ReusingLoad = canReuseLoadAddress(Op.getOperand(0), MVT::i32, RLI,
                                             DAG))) {
       int FrameIdx = MFI.CreateStackObject(4, 4, false);
       SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
       SDValue Store =
           DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0), FIdx,
                        MachinePointerInfo::getFixedStack(
                            DAG.getMachineFunction(), FrameIdx));
 
       assert(cast<StoreSDNode>(Store)->getMemoryVT() == MVT::i32 &&
              "Expected an i32 store");
 
       RLI.Ptr = FIdx;
       RLI.Chain = Store;
       RLI.MPI =
           MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx);
       RLI.Alignment = 4;
     }
 
     MachineMemOperand *MMO =
       MF.getMachineMemOperand(RLI.MPI, MachineMemOperand::MOLoad, 4,
                               RLI.Alignment, RLI.AAInfo, RLI.Ranges);
     SDValue Ops[] = { RLI.Chain, RLI.Ptr };
     Ld = DAG.getMemIntrinsicNode(Op.getOpcode() == ISD::UINT_TO_FP ?
                                    PPCISD::LFIWZX : PPCISD::LFIWAX,
                                  dl, DAG.getVTList(MVT::f64, MVT::Other),
                                  Ops, MVT::i32, MMO);
     if (ReusingLoad)
       spliceIntoChain(RLI.ResChain, Ld.getValue(1), DAG);
   } else {
     assert(Subtarget.isPPC64() &&
            "i32->FP without LFIWAX supported only on PPC64");
 
     int FrameIdx = MFI.CreateStackObject(8, 8, false);
     SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
     SDValue Ext64 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::i64,
                                 Op.getOperand(0));
 
     // STD the extended value into the stack slot.
     SDValue Store = DAG.getStore(
         DAG.getEntryNode(), dl, Ext64, FIdx,
         MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx));
 
     // Load the value as a double.
     Ld = DAG.getLoad(
         MVT::f64, dl, Store, FIdx,
         MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx));
   }
 
   // FCFID it and return it.
   SDValue FP = DAG.getNode(FCFOp, dl, FCFTy, Ld);
   if (Op.getValueType() == MVT::f32 && !Subtarget.hasFPCVT())
     FP = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, FP,
                      DAG.getIntPtrConstant(0, dl));
   return FP;
 }
 
 SDValue PPCTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
                                             SelectionDAG &DAG) const {
   SDLoc dl(Op);
   /*
    The rounding mode is in bits 30:31 of FPSR, and has the following
    settings:
      00 Round to nearest
      01 Round to 0
      10 Round to +inf
      11 Round to -inf
 
   FLT_ROUNDS, on the other hand, expects the following:
     -1 Undefined
      0 Round to 0
      1 Round to nearest
      2 Round to +inf
      3 Round to -inf
 
   To perform the conversion, we do:
     ((FPSCR & 0x3) ^ ((~FPSCR & 0x3) >> 1))
   */
 
   MachineFunction &MF = DAG.getMachineFunction();
   EVT VT = Op.getValueType();
   EVT PtrVT = getPointerTy(MF.getDataLayout());
 
   // Save FP Control Word to register
   EVT NodeTys[] = {
     MVT::f64,    // return register
     MVT::Glue    // unused in this context
   };
   SDValue Chain = DAG.getNode(PPCISD::MFFS, dl, NodeTys, None);
 
   // Save FP register to stack slot
   int SSFI = MF.getFrameInfo().CreateStackObject(8, 8, false);
   SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
   SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Chain, StackSlot,
                                MachinePointerInfo());
 
   // Load FP Control Word from low 32 bits of stack slot.
   SDValue Four = DAG.getConstant(4, dl, PtrVT);
   SDValue Addr = DAG.getNode(ISD::ADD, dl, PtrVT, StackSlot, Four);
   SDValue CWD = DAG.getLoad(MVT::i32, dl, Store, Addr, MachinePointerInfo());
 
   // Transform as necessary
   SDValue CWD1 =
     DAG.getNode(ISD::AND, dl, MVT::i32,
                 CWD, DAG.getConstant(3, dl, MVT::i32));
   SDValue CWD2 =
     DAG.getNode(ISD::SRL, dl, MVT::i32,
                 DAG.getNode(ISD::AND, dl, MVT::i32,
                             DAG.getNode(ISD::XOR, dl, MVT::i32,
                                         CWD, DAG.getConstant(3, dl, MVT::i32)),
                             DAG.getConstant(3, dl, MVT::i32)),
                 DAG.getConstant(1, dl, MVT::i32));
 
   SDValue RetVal =
     DAG.getNode(ISD::XOR, dl, MVT::i32, CWD1, CWD2);
 
   return DAG.getNode((VT.getSizeInBits() < 16 ?
                       ISD::TRUNCATE : ISD::ZERO_EXTEND), dl, VT, RetVal);
 }
 
 SDValue PPCTargetLowering::LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) const {
   EVT VT = Op.getValueType();
   unsigned BitWidth = VT.getSizeInBits();
   SDLoc dl(Op);
   assert(Op.getNumOperands() == 3 &&
          VT == Op.getOperand(1).getValueType() &&
          "Unexpected SHL!");
 
   // Expand into a bunch of logical ops.  Note that these ops
   // depend on the PPC behavior for oversized shift amounts.
   SDValue Lo = Op.getOperand(0);
   SDValue Hi = Op.getOperand(1);
   SDValue Amt = Op.getOperand(2);
   EVT AmtVT = Amt.getValueType();
 
   SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
                              DAG.getConstant(BitWidth, dl, AmtVT), Amt);
   SDValue Tmp2 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Amt);
   SDValue Tmp3 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Tmp1);
   SDValue Tmp4 = DAG.getNode(ISD::OR , dl, VT, Tmp2, Tmp3);
   SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
                              DAG.getConstant(-BitWidth, dl, AmtVT));
   SDValue Tmp6 = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Tmp5);
   SDValue OutHi = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
   SDValue OutLo = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Amt);
   SDValue OutOps[] = { OutLo, OutHi };
   return DAG.getMergeValues(OutOps, dl);
 }
 
 SDValue PPCTargetLowering::LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) const {
   EVT VT = Op.getValueType();
   SDLoc dl(Op);
   unsigned BitWidth = VT.getSizeInBits();
   assert(Op.getNumOperands() == 3 &&
          VT == Op.getOperand(1).getValueType() &&
          "Unexpected SRL!");
 
   // Expand into a bunch of logical ops.  Note that these ops
   // depend on the PPC behavior for oversized shift amounts.
   SDValue Lo = Op.getOperand(0);
   SDValue Hi = Op.getOperand(1);
   SDValue Amt = Op.getOperand(2);
   EVT AmtVT = Amt.getValueType();
 
   SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
                              DAG.getConstant(BitWidth, dl, AmtVT), Amt);
   SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
   SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
   SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
   SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
                              DAG.getConstant(-BitWidth, dl, AmtVT));
   SDValue Tmp6 = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Tmp5);
   SDValue OutLo = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
   SDValue OutHi = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Amt);
   SDValue OutOps[] = { OutLo, OutHi };
   return DAG.getMergeValues(OutOps, dl);
 }
 
 SDValue PPCTargetLowering::LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const {
   SDLoc dl(Op);
   EVT VT = Op.getValueType();
   unsigned BitWidth = VT.getSizeInBits();
   assert(Op.getNumOperands() == 3 &&
          VT == Op.getOperand(1).getValueType() &&
          "Unexpected SRA!");
 
   // Expand into a bunch of logical ops, followed by a select_cc.
   SDValue Lo = Op.getOperand(0);
   SDValue Hi = Op.getOperand(1);
   SDValue Amt = Op.getOperand(2);
   EVT AmtVT = Amt.getValueType();
 
   SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
                              DAG.getConstant(BitWidth, dl, AmtVT), Amt);
   SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
   SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
   SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
   SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
                              DAG.getConstant(-BitWidth, dl, AmtVT));
   SDValue Tmp6 = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Tmp5);
   SDValue OutHi = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Amt);
   SDValue OutLo = DAG.getSelectCC(dl, Tmp5, DAG.getConstant(0, dl, AmtVT),
                                   Tmp4, Tmp6, ISD::SETLE);
   SDValue OutOps[] = { OutLo, OutHi };
   return DAG.getMergeValues(OutOps, dl);
 }
 
 //===----------------------------------------------------------------------===//
 // Vector related lowering.
 //
 
 /// BuildSplatI - Build a canonical splati of Val with an element size of
 /// SplatSize.  Cast the result to VT.
 static SDValue BuildSplatI(int Val, unsigned SplatSize, EVT VT,
                            SelectionDAG &DAG, const SDLoc &dl) {
   static const MVT VTys[] = { // canonical VT to use for each size.
     MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
   };
 
   EVT ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
 
   // Force vspltis[hw] -1 to vspltisb -1 to canonicalize.
   if (Val == -1)
     SplatSize = 1;
 
   EVT CanonicalVT = VTys[SplatSize-1];
 
   // Build a canonical splat for this value.
   return DAG.getBitcast(ReqVT, DAG.getConstant(Val, dl, CanonicalVT));
 }
 
 /// BuildIntrinsicOp - Return a unary operator intrinsic node with the
 /// specified intrinsic ID.
 static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op, SelectionDAG &DAG,
                                 const SDLoc &dl, EVT DestVT = MVT::Other) {
   if (DestVT == MVT::Other) DestVT = Op.getValueType();
   return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
                      DAG.getConstant(IID, dl, MVT::i32), Op);
 }
 
 /// BuildIntrinsicOp - Return a binary operator intrinsic node with the
 /// specified intrinsic ID.
 static SDValue BuildIntrinsicOp(unsigned IID, SDValue LHS, SDValue RHS,
                                 SelectionDAG &DAG, const SDLoc &dl,
                                 EVT DestVT = MVT::Other) {
   if (DestVT == MVT::Other) DestVT = LHS.getValueType();
   return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
                      DAG.getConstant(IID, dl, MVT::i32), LHS, RHS);
 }
 
 /// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
 /// specified intrinsic ID.
 static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op0, SDValue Op1,
                                 SDValue Op2, SelectionDAG &DAG, const SDLoc &dl,
                                 EVT DestVT = MVT::Other) {
   if (DestVT == MVT::Other) DestVT = Op0.getValueType();
   return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
                      DAG.getConstant(IID, dl, MVT::i32), Op0, Op1, Op2);
 }
 
 /// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
 /// amount.  The result has the specified value type.
 static SDValue BuildVSLDOI(SDValue LHS, SDValue RHS, unsigned Amt, EVT VT,
                            SelectionDAG &DAG, const SDLoc &dl) {
   // Force LHS/RHS to be the right type.
   LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, LHS);
   RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, RHS);
 
   int Ops[16];
   for (unsigned i = 0; i != 16; ++i)
     Ops[i] = i + Amt;
   SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, LHS, RHS, Ops);
   return DAG.getNode(ISD::BITCAST, dl, VT, T);
 }
 
 /// Do we have an efficient pattern in a .td file for this node?
 ///
 /// \param V - pointer to the BuildVectorSDNode being matched
 /// \param HasDirectMove - does this subtarget have VSR <-> GPR direct moves?
 ///
 /// There are some patterns where it is beneficial to keep a BUILD_VECTOR
 /// node as a BUILD_VECTOR node rather than expanding it. The patterns where
 /// the opposite is true (expansion is beneficial) are:
 /// - The node builds a vector out of integers that are not 32 or 64-bits
 /// - The node builds a vector out of constants
 /// - The node is a "load-and-splat"
 /// In all other cases, we will choose to keep the BUILD_VECTOR.
 static bool haveEfficientBuildVectorPattern(BuildVectorSDNode *V,
                                             bool HasDirectMove,
                                             bool HasP8Vector) {
   EVT VecVT = V->getValueType(0);
   bool RightType = VecVT == MVT::v2f64 ||
     (HasP8Vector && VecVT == MVT::v4f32) ||
     (HasDirectMove && (VecVT == MVT::v2i64 || VecVT == MVT::v4i32));
   if (!RightType)
     return false;
 
   bool IsSplat = true;
   bool IsLoad = false;
   SDValue Op0 = V->getOperand(0);
 
   // This function is called in a block that confirms the node is not a constant
   // splat. So a constant BUILD_VECTOR here means the vector is built out of
   // different constants.
   if (V->isConstant())
     return false;
   for (int i = 0, e = V->getNumOperands(); i < e; ++i) {
     if (V->getOperand(i).isUndef())
       return false;
     // We want to expand nodes that represent load-and-splat even if the
     // loaded value is a floating point truncation or conversion to int.
     if (V->getOperand(i).getOpcode() == ISD::LOAD ||
         (V->getOperand(i).getOpcode() == ISD::FP_ROUND &&
          V->getOperand(i).getOperand(0).getOpcode() == ISD::LOAD) ||
         (V->getOperand(i).getOpcode() == ISD::FP_TO_SINT &&
          V->getOperand(i).getOperand(0).getOpcode() == ISD::LOAD) ||
         (V->getOperand(i).getOpcode() == ISD::FP_TO_UINT &&
          V->getOperand(i).getOperand(0).getOpcode() == ISD::LOAD))
       IsLoad = true;
     // If the operands are different or the input is not a load and has more
     // uses than just this BV node, then it isn't a splat.
     if (V->getOperand(i) != Op0 ||
         (!IsLoad && !V->isOnlyUserOf(V->getOperand(i).getNode())))
       IsSplat = false;
   }
   return !(IsSplat && IsLoad);
 }
 
 // Lower BITCAST(f128, (build_pair i64, i64)) to BUILD_FP128.
 SDValue PPCTargetLowering::LowerBITCAST(SDValue Op, SelectionDAG &DAG) const {
 
   SDLoc dl(Op);
   SDValue Op0 = Op->getOperand(0);
 
   if (!EnableQuadPrecision ||
       (Op.getValueType() != MVT::f128 ) ||
       (Op0.getOpcode() != ISD::BUILD_PAIR) ||
       (Op0.getOperand(0).getValueType() !=  MVT::i64) ||
       (Op0.getOperand(1).getValueType() != MVT::i64))
     return SDValue();
 
   return DAG.getNode(PPCISD::BUILD_FP128, dl, MVT::f128, Op0.getOperand(0),
                      Op0.getOperand(1));
 }
 
 static const SDValue *getNormalLoadInput(const SDValue &Op) {
   const SDValue *InputLoad = &Op;
   if (InputLoad->getOpcode() == ISD::BITCAST)
     InputLoad = &InputLoad->getOperand(0);
   if (InputLoad->getOpcode() == ISD::SCALAR_TO_VECTOR)
     InputLoad = &InputLoad->getOperand(0);
   if (InputLoad->getOpcode() != ISD::LOAD)
     return nullptr;
   LoadSDNode *LD = cast<LoadSDNode>(*InputLoad);
   return ISD::isNormalLoad(LD) ? InputLoad : nullptr;
 }
 
 // If this is a case we can't handle, return null and let the default
 // expansion code take care of it.  If we CAN select this case, and if it
 // selects to a single instruction, return Op.  Otherwise, if we can codegen
 // this case more efficiently than a constant pool load, lower it to the
 // sequence of ops that should be used.
 SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
                                              SelectionDAG &DAG) const {
   SDLoc dl(Op);
   BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
   assert(BVN && "Expected a BuildVectorSDNode in LowerBUILD_VECTOR");
 
   if (Subtarget.hasQPX() && Op.getValueType() == MVT::v4i1) {
     // We first build an i32 vector, load it into a QPX register,
     // then convert it to a floating-point vector and compare it
     // to a zero vector to get the boolean result.
     MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
     int FrameIdx = MFI.CreateStackObject(16, 16, false);
     MachinePointerInfo PtrInfo =
         MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx);
     EVT PtrVT = getPointerTy(DAG.getDataLayout());
     SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
     assert(BVN->getNumOperands() == 4 &&
       "BUILD_VECTOR for v4i1 does not have 4 operands");
 
     bool IsConst = true;
     for (unsigned i = 0; i < 4; ++i) {
       if (BVN->getOperand(i).isUndef()) continue;
       if (!isa<ConstantSDNode>(BVN->getOperand(i))) {
         IsConst = false;
         break;
       }
     }
 
     if (IsConst) {
       Constant *One =
         ConstantFP::get(Type::getFloatTy(*DAG.getContext()), 1.0);
       Constant *NegOne =
         ConstantFP::get(Type::getFloatTy(*DAG.getContext()), -1.0);
 
       Constant *CV[4];
       for (unsigned i = 0; i < 4; ++i) {
         if (BVN->getOperand(i).isUndef())
           CV[i] = UndefValue::get(Type::getFloatTy(*DAG.getContext()));
         else if (isNullConstant(BVN->getOperand(i)))
           CV[i] = NegOne;
         else
           CV[i] = One;
       }
 
       Constant *CP = ConstantVector::get(CV);
       SDValue CPIdx = DAG.getConstantPool(CP, getPointerTy(DAG.getDataLayout()),
                                           16 /* alignment */);
 
       SDValue Ops[] = {DAG.getEntryNode(), CPIdx};
       SDVTList VTs = DAG.getVTList({MVT::v4i1, /*chain*/ MVT::Other});
       return DAG.getMemIntrinsicNode(
           PPCISD::QVLFSb, dl, VTs, Ops, MVT::v4f32,
           MachinePointerInfo::getConstantPool(DAG.getMachineFunction()));
     }
 
     SmallVector<SDValue, 4> Stores;
     for (unsigned i = 0; i < 4; ++i) {
       if (BVN->getOperand(i).isUndef()) continue;
 
       unsigned Offset = 4*i;
       SDValue Idx = DAG.getConstant(Offset, dl, FIdx.getValueType());
       Idx = DAG.getNode(ISD::ADD, dl, FIdx.getValueType(), FIdx, Idx);
 
       unsigned StoreSize = BVN->getOperand(i).getValueType().getStoreSize();
       if (StoreSize > 4) {
         Stores.push_back(
             DAG.getTruncStore(DAG.getEntryNode(), dl, BVN->getOperand(i), Idx,
                               PtrInfo.getWithOffset(Offset), MVT::i32));
       } else {
         SDValue StoreValue = BVN->getOperand(i);
         if (StoreSize < 4)
           StoreValue = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, StoreValue);
 
         Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl, StoreValue, Idx,
                                       PtrInfo.getWithOffset(Offset)));
       }
     }
 
     SDValue StoreChain;
     if (!Stores.empty())
       StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Stores);
     else
       StoreChain = DAG.getEntryNode();
 
     // Now load from v4i32 into the QPX register; this will extend it to
     // v4i64 but not yet convert it to a floating point. Nevertheless, this
     // is typed as v4f64 because the QPX register integer states are not
     // explicitly represented.
 
     SDValue Ops[] = {StoreChain,
                      DAG.getConstant(Intrinsic::ppc_qpx_qvlfiwz, dl, MVT::i32),
                      FIdx};
     SDVTList VTs = DAG.getVTList({MVT::v4f64, /*chain*/ MVT::Other});
 
     SDValue LoadedVect = DAG.getMemIntrinsicNode(ISD::INTRINSIC_W_CHAIN,
       dl, VTs, Ops, MVT::v4i32, PtrInfo);
     LoadedVect = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f64,
       DAG.getConstant(Intrinsic::ppc_qpx_qvfcfidu, dl, MVT::i32),
       LoadedVect);
 
     SDValue FPZeros = DAG.getConstantFP(0.0, dl, MVT::v4f64);
 
     return DAG.getSetCC(dl, MVT::v4i1, LoadedVect, FPZeros, ISD::SETEQ);
   }
 
   // All other QPX vectors are handled by generic code.
   if (Subtarget.hasQPX())
     return SDValue();
 
   // Check if this is a splat of a constant value.
   APInt APSplatBits, APSplatUndef;
   unsigned SplatBitSize;
   bool HasAnyUndefs;
   if (! BVN->isConstantSplat(APSplatBits, APSplatUndef, SplatBitSize,
                              HasAnyUndefs, 0, !Subtarget.isLittleEndian()) ||
       SplatBitSize > 32) {
 
     const SDValue *InputLoad = getNormalLoadInput(Op.getOperand(0));
     // Handle load-and-splat patterns as we have instructions that will do this
     // in one go.
     if (InputLoad && DAG.isSplatValue(Op, true)) {
       LoadSDNode *LD = cast<LoadSDNode>(*InputLoad);
 
       // We have handling for 4 and 8 byte elements.
       unsigned ElementSize = LD->getMemoryVT().getScalarSizeInBits();
 
       // Checking for a single use of this load, we have to check for vector
       // width (128 bits) / ElementSize uses (since each operand of the
       // BUILD_VECTOR is a separate use of the value.
       if (InputLoad->getNode()->hasNUsesOfValue(128 / ElementSize, 0) &&
           ((Subtarget.hasVSX() && ElementSize == 64) ||
            (Subtarget.hasP9Vector() && ElementSize == 32))) {
         SDValue Ops[] = {
           LD->getChain(),    // Chain
           LD->getBasePtr(),  // Ptr
           DAG.getValueType(Op.getValueType()) // VT
         };
         return
           DAG.getMemIntrinsicNode(PPCISD::LD_SPLAT, dl,
                                   DAG.getVTList(Op.getValueType(), MVT::Other),
                                   Ops, LD->getMemoryVT(), LD->getMemOperand());
       }
     }
 
     // BUILD_VECTOR nodes that are not constant splats of up to 32-bits can be
     // lowered to VSX instructions under certain conditions.
     // Without VSX, there is no pattern more efficient than expanding the node.
     if (Subtarget.hasVSX() &&
         haveEfficientBuildVectorPattern(BVN, Subtarget.hasDirectMove(),
                                         Subtarget.hasP8Vector()))
       return Op;
     return SDValue();
   }
 
   unsigned SplatBits = APSplatBits.getZExtValue();
   unsigned SplatUndef = APSplatUndef.getZExtValue();
   unsigned SplatSize = SplatBitSize / 8;
 
   // First, handle single instruction cases.
 
   // All zeros?
   if (SplatBits == 0) {
     // Canonicalize all zero vectors to be v4i32.
     if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
       SDValue Z = DAG.getConstant(0, dl, MVT::v4i32);
       Op = DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Z);
     }
     return Op;
   }
 
   // We have XXSPLTIB for constant splats one byte wide
   // FIXME: SplatBits is an unsigned int being cast to an int while passing it
   // as an argument to BuildSplatiI. Given SplatSize == 1 it is okay here.
   if (Subtarget.hasP9Vector() && SplatSize == 1)
     return BuildSplatI(SplatBits, SplatSize, Op.getValueType(), DAG, dl);
 
   // If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
   int32_t SextVal= (int32_t(SplatBits << (32-SplatBitSize)) >>
                     (32-SplatBitSize));
   if (SextVal >= -16 && SextVal <= 15)
     return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG, dl);
 
   // Two instruction sequences.
 
   // If this value is in the range [-32,30] and is even, use:
   //     VSPLTI[bhw](val/2) + VSPLTI[bhw](val/2)
   // If this value is in the range [17,31] and is odd, use:
   //     VSPLTI[bhw](val-16) - VSPLTI[bhw](-16)
   // If this value is in the range [-31,-17] and is odd, use:
   //     VSPLTI[bhw](val+16) + VSPLTI[bhw](-16)
   // Note the last two are three-instruction sequences.
   if (SextVal >= -32 && SextVal <= 31) {
     // To avoid having these optimizations undone by constant folding,
     // we convert to a pseudo that will be expanded later into one of
     // the above forms.
     SDValue Elt = DAG.getConstant(SextVal, dl, MVT::i32);
     EVT VT = (SplatSize == 1 ? MVT::v16i8 :
               (SplatSize == 2 ? MVT::v8i16 : MVT::v4i32));
     SDValue EltSize = DAG.getConstant(SplatSize, dl, MVT::i32);
     SDValue RetVal = DAG.getNode(PPCISD::VADD_SPLAT, dl, VT, Elt, EltSize);
     if (VT == Op.getValueType())
       return RetVal;
     else
       return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), RetVal);
   }
 
   // If this is 0x8000_0000 x 4, turn into vspltisw + vslw.  If it is
   // 0x7FFF_FFFF x 4, turn it into not(0x8000_0000).  This is important
   // for fneg/fabs.
   if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
     // Make -1 and vspltisw -1:
     SDValue OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG, dl);
 
     // Make the VSLW intrinsic, computing 0x8000_0000.
     SDValue Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
                                    OnesV, DAG, dl);
 
     // xor by OnesV to invert it.
     Res = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Res, OnesV);
     return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
   }
 
   // Check to see if this is a wide variety of vsplti*, binop self cases.
   static const signed char SplatCsts[] = {
     -1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
     -8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
   };
 
   for (unsigned idx = 0; idx < array_lengthof(SplatCsts); ++idx) {
     // Indirect through the SplatCsts array so that we favor 'vsplti -1' for
     // cases which are ambiguous (e.g. formation of 0x8000_0000).  'vsplti -1'
     int i = SplatCsts[idx];
 
     // Figure out what shift amount will be used by altivec if shifted by i in
     // this splat size.
     unsigned TypeShiftAmt = i & (SplatBitSize-1);
 
     // vsplti + shl self.
     if (SextVal == (int)((unsigned)i << TypeShiftAmt)) {
       SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
       static const unsigned IIDs[] = { // Intrinsic to use for each size.
         Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
         Intrinsic::ppc_altivec_vslw
       };
       Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
       return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
     }
 
     // vsplti + srl self.
     if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
       SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
       static const unsigned IIDs[] = { // Intrinsic to use for each size.
         Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
         Intrinsic::ppc_altivec_vsrw
       };
       Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
       return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
     }
 
     // vsplti + sra self.
     if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
       SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
       static const unsigned IIDs[] = { // Intrinsic to use for each size.
         Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
         Intrinsic::ppc_altivec_vsraw
       };
       Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
       return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
     }
 
     // vsplti + rol self.
     if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
                          ((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
       SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
       static const unsigned IIDs[] = { // Intrinsic to use for each size.
         Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
         Intrinsic::ppc_altivec_vrlw
       };
       Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
       return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
     }
 
     // t = vsplti c, result = vsldoi t, t, 1
     if (SextVal == (int)(((unsigned)i << 8) | (i < 0 ? 0xFF : 0))) {
       SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
       unsigned Amt = Subtarget.isLittleEndian() ? 15 : 1;
       return BuildVSLDOI(T, T, Amt, Op.getValueType(), DAG, dl);
     }
     // t = vsplti c, result = vsldoi t, t, 2
     if (SextVal == (int)(((unsigned)i << 16) | (i < 0 ? 0xFFFF : 0))) {
       SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
       unsigned Amt = Subtarget.isLittleEndian() ? 14 : 2;
       return BuildVSLDOI(T, T, Amt, Op.getValueType(), DAG, dl);
     }
     // t = vsplti c, result = vsldoi t, t, 3
     if (SextVal == (int)(((unsigned)i << 24) | (i < 0 ? 0xFFFFFF : 0))) {
       SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
       unsigned Amt = Subtarget.isLittleEndian() ? 13 : 3;
       return BuildVSLDOI(T, T, Amt, Op.getValueType(), DAG, dl);
     }
   }
 
   return SDValue();
 }
 
 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
 /// the specified operations to build the shuffle.
 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
                                       SDValue RHS, SelectionDAG &DAG,
                                       const SDLoc &dl) {
   unsigned OpNum = (PFEntry >> 26) & 0x0F;
   unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
   unsigned RHSID = (PFEntry >>  0) & ((1 << 13)-1);
 
   enum {
     OP_COPY = 0,  // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
     OP_VMRGHW,
     OP_VMRGLW,
     OP_VSPLTISW0,
     OP_VSPLTISW1,
     OP_VSPLTISW2,
     OP_VSPLTISW3,
     OP_VSLDOI4,
     OP_VSLDOI8,
     OP_VSLDOI12
   };
 
   if (OpNum == OP_COPY) {
     if (LHSID == (1*9+2)*9+3) return LHS;
     assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
     return RHS;
   }
 
   SDValue OpLHS, OpRHS;
   OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
   OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
 
   int ShufIdxs[16];
   switch (OpNum) {
   default: llvm_unreachable("Unknown i32 permute!");
   case OP_VMRGHW:
     ShufIdxs[ 0] =  0; ShufIdxs[ 1] =  1; ShufIdxs[ 2] =  2; ShufIdxs[ 3] =  3;
     ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
     ShufIdxs[ 8] =  4; ShufIdxs[ 9] =  5; ShufIdxs[10] =  6; ShufIdxs[11] =  7;
     ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
     break;
   case OP_VMRGLW:
     ShufIdxs[ 0] =  8; ShufIdxs[ 1] =  9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
     ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
     ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
     ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
     break;
   case OP_VSPLTISW0:
     for (unsigned i = 0; i != 16; ++i)
       ShufIdxs[i] = (i&3)+0;
     break;
   case OP_VSPLTISW1:
     for (unsigned i = 0; i != 16; ++i)
       ShufIdxs[i] = (i&3)+4;
     break;
   case OP_VSPLTISW2:
     for (unsigned i = 0; i != 16; ++i)
       ShufIdxs[i] = (i&3)+8;
     break;
   case OP_VSPLTISW3:
     for (unsigned i = 0; i != 16; ++i)
       ShufIdxs[i] = (i&3)+12;
     break;
   case OP_VSLDOI4:
     return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG, dl);
   case OP_VSLDOI8:
     return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG, dl);
   case OP_VSLDOI12:
     return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG, dl);
   }
   EVT VT = OpLHS.getValueType();
   OpLHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpLHS);
   OpRHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpRHS);
   SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, OpLHS, OpRHS, ShufIdxs);
   return DAG.getNode(ISD::BITCAST, dl, VT, T);
 }
 
 /// lowerToVINSERTB - Return the SDValue if this VECTOR_SHUFFLE can be handled
 /// by the VINSERTB instruction introduced in ISA 3.0, else just return default
 /// SDValue.
 SDValue PPCTargetLowering::lowerToVINSERTB(ShuffleVectorSDNode *N,
                                            SelectionDAG &DAG) const {
   const unsigned BytesInVector = 16;
   bool IsLE = Subtarget.isLittleEndian();
   SDLoc dl(N);
   SDValue V1 = N->getOperand(0);
   SDValue V2 = N->getOperand(1);
   unsigned ShiftElts = 0, InsertAtByte = 0;
   bool Swap = false;
 
   // Shifts required to get the byte we want at element 7.
   unsigned LittleEndianShifts[] = {8, 7,  6,  5,  4,  3,  2,  1,
                                    0, 15, 14, 13, 12, 11, 10, 9};
   unsigned BigEndianShifts[] = {9, 10, 11, 12, 13, 14, 15, 0,
                                 1, 2,  3,  4,  5,  6,  7,  8};
 
   ArrayRef<int> Mask = N->getMask();
   int OriginalOrder[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
 
   // For each mask element, find out if we're just inserting something
   // from V2 into V1 or vice versa.
   // Possible permutations inserting an element from V2 into V1:
   //   X, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
   //   0, X, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
   //   ...
   //   0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, X
   // Inserting from V1 into V2 will be similar, except mask range will be
   // [16,31].
 
   bool FoundCandidate = false;
   // If both vector operands for the shuffle are the same vector, the mask
   // will contain only elements from the first one and the second one will be
   // undef.
   unsigned VINSERTBSrcElem = IsLE ? 8 : 7;
   // Go through the mask of half-words to find an element that's being moved
   // from one vector to the other.
   for (unsigned i = 0; i < BytesInVector; ++i) {
     unsigned CurrentElement = Mask[i];
     // If 2nd operand is undefined, we should only look for element 7 in the
     // Mask.
     if (V2.isUndef() && CurrentElement != VINSERTBSrcElem)
       continue;
 
     bool OtherElementsInOrder = true;
     // Examine the other elements in the Mask to see if they're in original
     // order.
     for (unsigned j = 0; j < BytesInVector; ++j) {
       if (j == i)
         continue;
       // If CurrentElement is from V1 [0,15], then we the rest of the Mask to be
       // from V2 [16,31] and vice versa.  Unless the 2nd operand is undefined,
       // in which we always assume we're always picking from the 1st operand.
       int MaskOffset =
           (!V2.isUndef() && CurrentElement < BytesInVector) ? BytesInVector : 0;
       if (Mask[j] != OriginalOrder[j] + MaskOffset) {
         OtherElementsInOrder = false;
         break;
       }
     }
     // If other elements are in original order, we record the number of shifts
     // we need to get the element we want into element 7. Also record which byte
     // in the vector we should insert into.
     if (OtherElementsInOrder) {
       // If 2nd operand is undefined, we assume no shifts and no swapping.
       if (V2.isUndef()) {
         ShiftElts = 0;
         Swap = false;
       } else {
         // Only need the last 4-bits for shifts because operands will be swapped if CurrentElement is >= 2^4.
         ShiftElts = IsLE ? LittleEndianShifts[CurrentElement & 0xF]
                          : BigEndianShifts[CurrentElement & 0xF];
         Swap = CurrentElement < BytesInVector;
       }
       InsertAtByte = IsLE ? BytesInVector - (i + 1) : i;
       FoundCandidate = true;
       break;
     }
   }
 
   if (!FoundCandidate)
     return SDValue();
 
   // Candidate found, construct the proper SDAG sequence with VINSERTB,
   // optionally with VECSHL if shift is required.
   if (Swap)
     std::swap(V1, V2);
   if (V2.isUndef())
     V2 = V1;
   if (ShiftElts) {
     SDValue Shl = DAG.getNode(PPCISD::VECSHL, dl, MVT::v16i8, V2, V2,
                               DAG.getConstant(ShiftElts, dl, MVT::i32));
     return DAG.getNode(PPCISD::VECINSERT, dl, MVT::v16i8, V1, Shl,
                        DAG.getConstant(InsertAtByte, dl, MVT::i32));
   }
   return DAG.getNode(PPCISD::VECINSERT, dl, MVT::v16i8, V1, V2,
                      DAG.getConstant(InsertAtByte, dl, MVT::i32));
 }
 
 /// lowerToVINSERTH - Return the SDValue if this VECTOR_SHUFFLE can be handled
 /// by the VINSERTH instruction introduced in ISA 3.0, else just return default
 /// SDValue.
 SDValue PPCTargetLowering::lowerToVINSERTH(ShuffleVectorSDNode *N,
                                            SelectionDAG &DAG) const {
   const unsigned NumHalfWords = 8;
   const unsigned BytesInVector = NumHalfWords * 2;
   // Check that the shuffle is on half-words.
   if (!isNByteElemShuffleMask(N, 2, 1))
     return SDValue();
 
   bool IsLE = Subtarget.isLittleEndian();
   SDLoc dl(N);
   SDValue V1 = N->getOperand(0);
   SDValue V2 = N->getOperand(1);
   unsigned ShiftElts = 0, InsertAtByte = 0;
   bool Swap = false;
 
   // Shifts required to get the half-word we want at element 3.
   unsigned LittleEndianShifts[] = {4, 3, 2, 1, 0, 7, 6, 5};
   unsigned BigEndianShifts[] = {5, 6, 7, 0, 1, 2, 3, 4};
 
   uint32_t Mask = 0;
   uint32_t OriginalOrderLow = 0x1234567;
   uint32_t OriginalOrderHigh = 0x89ABCDEF;
   // Now we look at mask elements 0,2,4,6,8,10,12,14.  Pack the mask into a
   // 32-bit space, only need 4-bit nibbles per element.
   for (unsigned i = 0; i < NumHalfWords; ++i) {
     unsigned MaskShift = (NumHalfWords - 1 - i) * 4;
     Mask |= ((uint32_t)(N->getMaskElt(i * 2) / 2) << MaskShift);
   }
 
   // For each mask element, find out if we're just inserting something
   // from V2 into V1 or vice versa.  Possible permutations inserting an element
   // from V2 into V1:
   //   X, 1, 2, 3, 4, 5, 6, 7
   //   0, X, 2, 3, 4, 5, 6, 7
   //   0, 1, X, 3, 4, 5, 6, 7
   //   0, 1, 2, X, 4, 5, 6, 7
   //   0, 1, 2, 3, X, 5, 6, 7
   //   0, 1, 2, 3, 4, X, 6, 7
   //   0, 1, 2, 3, 4, 5, X, 7
   //   0, 1, 2, 3, 4, 5, 6, X
   // Inserting from V1 into V2 will be similar, except mask range will be [8,15].
 
   bool FoundCandidate = false;
   // Go through the mask of half-words to find an element that's being moved
   // from one vector to the other.
   for (unsigned i = 0; i < NumHalfWords; ++i) {
     unsigned MaskShift = (NumHalfWords - 1 - i) * 4;
     uint32_t MaskOneElt = (Mask >> MaskShift) & 0xF;
     uint32_t MaskOtherElts = ~(0xF << MaskShift);
     uint32_t TargetOrder = 0x0;
 
     // If both vector operands for the shuffle are the same vector, the mask
     // will contain only elements from the first one and the second one will be
     // undef.
     if (V2.isUndef()) {
       ShiftElts = 0;
       unsigned VINSERTHSrcElem = IsLE ? 4 : 3;
       TargetOrder = OriginalOrderLow;
       Swap = false;
       // Skip if not the correct element or mask of other elements don't equal
       // to our expected order.
       if (MaskOneElt == VINSERTHSrcElem &&
           (Mask & MaskOtherElts) == (TargetOrder & MaskOtherElts)) {
         InsertAtByte = IsLE ? BytesInVector - (i + 1) * 2 : i * 2;
         FoundCandidate = true;
         break;
       }
     } else { // If both operands are defined.
       // Target order is [8,15] if the current mask is between [0,7].
       TargetOrder =
           (MaskOneElt < NumHalfWords) ? OriginalOrderHigh : OriginalOrderLow;
       // Skip if mask of other elements don't equal our expected order.
       if ((Mask & MaskOtherElts) == (TargetOrder & MaskOtherElts)) {
         // We only need the last 3 bits for the number of shifts.
         ShiftElts = IsLE ? LittleEndianShifts[MaskOneElt & 0x7]
                          : BigEndianShifts[MaskOneElt & 0x7];
         InsertAtByte = IsLE ? BytesInVector - (i + 1) * 2 : i * 2;
         Swap = MaskOneElt < NumHalfWords;
         FoundCandidate = true;
         break;
       }
     }
   }
 
   if (!FoundCandidate)
     return SDValue();
 
   // Candidate found, construct the proper SDAG sequence with VINSERTH,
   // optionally with VECSHL if shift is required.
   if (Swap)
     std::swap(V1, V2);
   if (V2.isUndef())
     V2 = V1;
   SDValue Conv1 = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V1);
   if (ShiftElts) {
     // Double ShiftElts because we're left shifting on v16i8 type.
     SDValue Shl = DAG.getNode(PPCISD::VECSHL, dl, MVT::v16i8, V2, V2,
                               DAG.getConstant(2 * ShiftElts, dl, MVT::i32));
     SDValue Conv2 = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, Shl);
     SDValue Ins = DAG.getNode(PPCISD::VECINSERT, dl, MVT::v8i16, Conv1, Conv2,
                               DAG.getConstant(InsertAtByte, dl, MVT::i32));
     return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Ins);
   }
   SDValue Conv2 = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V2);
   SDValue Ins = DAG.getNode(PPCISD::VECINSERT, dl, MVT::v8i16, Conv1, Conv2,
                             DAG.getConstant(InsertAtByte, dl, MVT::i32));
   return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Ins);
 }
 
 /// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE.  If this
 /// is a shuffle we can handle in a single instruction, return it.  Otherwise,
 /// return the code it can be lowered into.  Worst case, it can always be
 /// lowered into a vperm.
 SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
                                                SelectionDAG &DAG) const {
   SDLoc dl(Op);
   SDValue V1 = Op.getOperand(0);
   SDValue V2 = Op.getOperand(1);
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
   EVT VT = Op.getValueType();
   bool isLittleEndian = Subtarget.isLittleEndian();
 
   unsigned ShiftElts, InsertAtByte;
   bool Swap = false;
 
   // If this is a load-and-splat, we can do that with a single instruction
   // in some cases. However if the load has multiple uses, we don't want to
   // combine it because that will just produce multiple loads.
   const SDValue *InputLoad = getNormalLoadInput(V1);
   if (InputLoad && Subtarget.hasVSX() && V2.isUndef() &&
       (PPC::isSplatShuffleMask(SVOp, 4) || PPC::isSplatShuffleMask(SVOp, 8)) &&
       InputLoad->hasOneUse()) {
     bool IsFourByte = PPC::isSplatShuffleMask(SVOp, 4);
     int SplatIdx =
       PPC::getSplatIdxForPPCMnemonics(SVOp, IsFourByte ? 4 : 8, DAG);
 
     LoadSDNode *LD = cast<LoadSDNode>(*InputLoad);
     // For 4-byte load-and-splat, we need Power9.
     if ((IsFourByte && Subtarget.hasP9Vector()) || !IsFourByte) {
       uint64_t Offset = 0;
       if (IsFourByte)
         Offset = isLittleEndian ? (3 - SplatIdx) * 4 : SplatIdx * 4;
       else
         Offset = isLittleEndian ? (1 - SplatIdx) * 8 : SplatIdx * 8;
       SDValue BasePtr = LD->getBasePtr();
       if (Offset != 0)
         BasePtr = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
                               BasePtr, DAG.getIntPtrConstant(Offset, dl));
       SDValue Ops[] = {
         LD->getChain(),    // Chain
         BasePtr,           // BasePtr
         DAG.getValueType(Op.getValueType()) // VT
       };
       SDVTList VTL =
         DAG.getVTList(IsFourByte ? MVT::v4i32 : MVT::v2i64, MVT::Other);
       SDValue LdSplt =
         DAG.getMemIntrinsicNode(PPCISD::LD_SPLAT, dl, VTL,
                                 Ops, LD->getMemoryVT(), LD->getMemOperand());
       if (LdSplt.getValueType() != SVOp->getValueType(0))
         LdSplt = DAG.getBitcast(SVOp->getValueType(0), LdSplt);
       return LdSplt;
     }
   }
   if (Subtarget.hasP9Vector() &&
       PPC::isXXINSERTWMask(SVOp, ShiftElts, InsertAtByte, Swap,
                            isLittleEndian)) {
     if (Swap)
       std::swap(V1, V2);
     SDValue Conv1 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V1);
     SDValue Conv2 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V2);
     if (ShiftElts) {
       SDValue Shl = DAG.getNode(PPCISD::VECSHL, dl, MVT::v4i32, Conv2, Conv2,
                                 DAG.getConstant(ShiftElts, dl, MVT::i32));
       SDValue Ins = DAG.getNode(PPCISD::VECINSERT, dl, MVT::v4i32, Conv1, Shl,
                                 DAG.getConstant(InsertAtByte, dl, MVT::i32));
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Ins);
     }
     SDValue Ins = DAG.getNode(PPCISD::VECINSERT, dl, MVT::v4i32, Conv1, Conv2,
                               DAG.getConstant(InsertAtByte, dl, MVT::i32));
     return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Ins);
   }
 
   if (Subtarget.hasP9Altivec()) {
     SDValue NewISDNode;
     if ((NewISDNode = lowerToVINSERTH(SVOp, DAG)))
       return NewISDNode;
 
     if ((NewISDNode = lowerToVINSERTB(SVOp, DAG)))
       return NewISDNode;
   }
 
   if (Subtarget.hasVSX() &&
       PPC::isXXSLDWIShuffleMask(SVOp, ShiftElts, Swap, isLittleEndian)) {
     if (Swap)
       std::swap(V1, V2);
     SDValue Conv1 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V1);
     SDValue Conv2 =
         DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V2.isUndef() ? V1 : V2);
 
     SDValue Shl = DAG.getNode(PPCISD::VECSHL, dl, MVT::v4i32, Conv1, Conv2,
                               DAG.getConstant(ShiftElts, dl, MVT::i32));
     return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Shl);
   }
 
   if (Subtarget.hasVSX() &&
     PPC::isXXPERMDIShuffleMask(SVOp, ShiftElts, Swap, isLittleEndian)) {
     if (Swap)
       std::swap(V1, V2);
     SDValue Conv1 = DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, V1);
     SDValue Conv2 =
         DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, V2.isUndef() ? V1 : V2);
 
     SDValue PermDI = DAG.getNode(PPCISD::XXPERMDI, dl, MVT::v2i64, Conv1, Conv2,
                               DAG.getConstant(ShiftElts, dl, MVT::i32));
     return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, PermDI);
   }
 
   if (Subtarget.hasP9Vector()) {
      if (PPC::isXXBRHShuffleMask(SVOp)) {
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, V1);
       SDValue ReveHWord = DAG.getNode(ISD::BSWAP, dl, MVT::v8i16, Conv);
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, ReveHWord);
     } else if (PPC::isXXBRWShuffleMask(SVOp)) {
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V1);
       SDValue ReveWord = DAG.getNode(ISD::BSWAP, dl, MVT::v4i32, Conv);
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, ReveWord);
     } else if (PPC::isXXBRDShuffleMask(SVOp)) {
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v2i64, V1);
       SDValue ReveDWord = DAG.getNode(ISD::BSWAP, dl, MVT::v2i64, Conv);
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, ReveDWord);
     } else if (PPC::isXXBRQShuffleMask(SVOp)) {
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v1i128, V1);
       SDValue ReveQWord = DAG.getNode(ISD::BSWAP, dl, MVT::v1i128, Conv);
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, ReveQWord);
     }
   }
 
   if (Subtarget.hasVSX()) {
     if (V2.isUndef() && PPC::isSplatShuffleMask(SVOp, 4)) {
       int SplatIdx = PPC::getSplatIdxForPPCMnemonics(SVOp, 4, DAG);
 
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, V1);
       SDValue Splat = DAG.getNode(PPCISD::XXSPLT, dl, MVT::v4i32, Conv,
                                   DAG.getConstant(SplatIdx, dl, MVT::i32));
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Splat);
     }
 
     // Left shifts of 8 bytes are actually swaps. Convert accordingly.
     if (V2.isUndef() && PPC::isVSLDOIShuffleMask(SVOp, 1, DAG) == 8) {
       SDValue Conv = DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, V1);
       SDValue Swap = DAG.getNode(PPCISD::SWAP_NO_CHAIN, dl, MVT::v2f64, Conv);
       return DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, Swap);
     }
   }
 
   if (Subtarget.hasQPX()) {
     if (VT.getVectorNumElements() != 4)
       return SDValue();
 
     if (V2.isUndef()) V2 = V1;
 
     int AlignIdx = PPC::isQVALIGNIShuffleMask(SVOp);
     if (AlignIdx != -1) {
       return DAG.getNode(PPCISD::QVALIGNI, dl, VT, V1, V2,
                          DAG.getConstant(AlignIdx, dl, MVT::i32));
     } else if (SVOp->isSplat()) {
       int SplatIdx = SVOp->getSplatIndex();
       if (SplatIdx >= 4) {
         std::swap(V1, V2);
         SplatIdx -= 4;
       }
 
       return DAG.getNode(PPCISD::QVESPLATI, dl, VT, V1,
                          DAG.getConstant(SplatIdx, dl, MVT::i32));
     }
 
     // Lower this into a qvgpci/qvfperm pair.
 
     // Compute the qvgpci literal
     unsigned idx = 0;
     for (unsigned i = 0; i < 4; ++i) {
       int m = SVOp->getMaskElt(i);
       unsigned mm = m >= 0 ? (unsigned) m : i;
       idx |= mm << (3-i)*3;
     }
 
     SDValue V3 = DAG.getNode(PPCISD::QVGPCI, dl, MVT::v4f64,
                              DAG.getConstant(idx, dl, MVT::i32));
     return DAG.getNode(PPCISD::QVFPERM, dl, VT, V1, V2, V3);
   }
 
   // Cases that are handled by instructions that take permute immediates
   // (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
   // selected by the instruction selector.
   if (V2.isUndef()) {
     if (PPC::isSplatShuffleMask(SVOp, 1) ||
         PPC::isSplatShuffleMask(SVOp, 2) ||
         PPC::isSplatShuffleMask(SVOp, 4) ||
         PPC::isVPKUWUMShuffleMask(SVOp, 1, DAG) ||
         PPC::isVPKUHUMShuffleMask(SVOp, 1, DAG) ||
         PPC::isVSLDOIShuffleMask(SVOp, 1, DAG) != -1 ||
         PPC::isVMRGLShuffleMask(SVOp, 1, 1, DAG) ||
         PPC::isVMRGLShuffleMask(SVOp, 2, 1, DAG) ||
         PPC::isVMRGLShuffleMask(SVOp, 4, 1, DAG) ||
         PPC::isVMRGHShuffleMask(SVOp, 1, 1, DAG) ||
         PPC::isVMRGHShuffleMask(SVOp, 2, 1, DAG) ||
         PPC::isVMRGHShuffleMask(SVOp, 4, 1, DAG) ||
         (Subtarget.hasP8Altivec() && (
          PPC::isVPKUDUMShuffleMask(SVOp, 1, DAG) ||
          PPC::isVMRGEOShuffleMask(SVOp, true, 1, DAG) ||
          PPC::isVMRGEOShuffleMask(SVOp, false, 1, DAG)))) {
       return Op;
     }
   }
 
   // Altivec has a variety of "shuffle immediates" that take two vector inputs
   // and produce a fixed permutation.  If any of these match, do not lower to
   // VPERM.
   unsigned int ShuffleKind = isLittleEndian ? 2 : 0;
   if (PPC::isVPKUWUMShuffleMask(SVOp, ShuffleKind, DAG) ||
       PPC::isVPKUHUMShuffleMask(SVOp, ShuffleKind, DAG) ||
       PPC::isVSLDOIShuffleMask(SVOp, ShuffleKind, DAG) != -1 ||
       PPC::isVMRGLShuffleMask(SVOp, 1, ShuffleKind, DAG) ||
       PPC::isVMRGLShuffleMask(SVOp, 2, ShuffleKind, DAG) ||
       PPC::isVMRGLShuffleMask(SVOp, 4, ShuffleKind, DAG) ||
       PPC::isVMRGHShuffleMask(SVOp, 1, ShuffleKind, DAG) ||
       PPC::isVMRGHShuffleMask(SVOp, 2, ShuffleKind, DAG) ||
       PPC::isVMRGHShuffleMask(SVOp, 4, ShuffleKind, DAG) ||
       (Subtarget.hasP8Altivec() && (
        PPC::isVPKUDUMShuffleMask(SVOp, ShuffleKind, DAG) ||
        PPC::isVMRGEOShuffleMask(SVOp, true, ShuffleKind, DAG) ||
        PPC::isVMRGEOShuffleMask(SVOp, false, ShuffleKind, DAG))))
     return Op;
 
   // Check to see if this is a shuffle of 4-byte values.  If so, we can use our
   // perfect shuffle table to emit an optimal matching sequence.
   ArrayRef<int> PermMask = SVOp->getMask();
 
   unsigned PFIndexes[4];
   bool isFourElementShuffle = true;
   for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
     unsigned EltNo = 8;   // Start out undef.
     for (unsigned j = 0; j != 4; ++j) {  // Intra-element byte.
       if (PermMask[i*4+j] < 0)
         continue;   // Undef, ignore it.
 
       unsigned ByteSource = PermMask[i*4+j];
       if ((ByteSource & 3) != j) {
         isFourElementShuffle = false;
         break;
       }
 
       if (EltNo == 8) {
         EltNo = ByteSource/4;
       } else if (EltNo != ByteSource/4) {
         isFourElementShuffle = false;
         break;
       }
     }
     PFIndexes[i] = EltNo;
   }
 
   // If this shuffle can be expressed as a shuffle of 4-byte elements, use the
   // perfect shuffle vector to determine if it is cost effective to do this as
   // discrete instructions, or whether we should use a vperm.
   // For now, we skip this for little endian until such time as we have a
   // little-endian perfect shuffle table.
   if (isFourElementShuffle && !isLittleEndian) {
     // Compute the index in the perfect shuffle table.
     unsigned PFTableIndex =
       PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
 
     unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
     unsigned Cost  = (PFEntry >> 30);
 
     // Determining when to avoid vperm is tricky.  Many things affect the cost
     // of vperm, particularly how many times the perm mask needs to be computed.
     // For example, if the perm mask can be hoisted out of a loop or is already
     // used (perhaps because there are multiple permutes with the same shuffle
     // mask?) the vperm has a cost of 1.  OTOH, hoisting the permute mask out of
     // the loop requires an extra register.
     //
     // As a compromise, we only emit discrete instructions if the shuffle can be
     // generated in 3 or fewer operations.  When we have loop information
     // available, if this block is within a loop, we should avoid using vperm
     // for 3-operation perms and use a constant pool load instead.
     if (Cost < 3)
       return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
   }
 
   // Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
   // vector that will get spilled to the constant pool.
   if (V2.isUndef()) V2 = V1;
 
   // The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
   // that it is in input element units, not in bytes.  Convert now.
 
   // For little endian, the order of the input vectors is reversed, and
   // the permutation mask is complemented with respect to 31.  This is
   // necessary to produce proper semantics with the big-endian-biased vperm
   // instruction.
   EVT EltVT = V1.getValueType().getVectorElementType();
   unsigned BytesPerElement = EltVT.getSizeInBits()/8;
 
   SmallVector<SDValue, 16> ResultMask;
   for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
     unsigned SrcElt = PermMask[i] < 0 ? 0 : PermMask[i];
 
     for (unsigned j = 0; j != BytesPerElement; ++j)
       if (isLittleEndian)
         ResultMask.push_back(DAG.getConstant(31 - (SrcElt*BytesPerElement + j),
                                              dl, MVT::i32));
       else
         ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement + j, dl,
                                              MVT::i32));
   }
 
   SDValue VPermMask = DAG.getBuildVector(MVT::v16i8, dl, ResultMask);
   if (isLittleEndian)
     return DAG.getNode(PPCISD::VPERM, dl, V1.getValueType(),
                        V2, V1, VPermMask);
   else
     return DAG.getNode(PPCISD::VPERM, dl, V1.getValueType(),
                        V1, V2, VPermMask);
 }
 
 /// getVectorCompareInfo - Given an intrinsic, return false if it is not a
 /// vector comparison.  If it is, return true and fill in Opc/isDot with
 /// information about the intrinsic.
 static bool getVectorCompareInfo(SDValue Intrin, int &CompareOpc,
                                  bool &isDot, const PPCSubtarget &Subtarget) {
   unsigned IntrinsicID =
       cast<ConstantSDNode>(Intrin.getOperand(0))->getZExtValue();
   CompareOpc = -1;
   isDot = false;
   switch (IntrinsicID) {
   default:
     return false;
   // Comparison predicates.
   case Intrinsic::ppc_altivec_vcmpbfp_p:
     CompareOpc = 966;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpeqfp_p:
     CompareOpc = 198;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpequb_p:
     CompareOpc = 6;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpequh_p:
     CompareOpc = 70;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpequw_p:
     CompareOpc = 134;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpequd_p:
     if (Subtarget.hasP8Altivec()) {
       CompareOpc = 199;
       isDot = true;
     } else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpneb_p:
   case Intrinsic::ppc_altivec_vcmpneh_p:
   case Intrinsic::ppc_altivec_vcmpnew_p:
   case Intrinsic::ppc_altivec_vcmpnezb_p:
   case Intrinsic::ppc_altivec_vcmpnezh_p:
   case Intrinsic::ppc_altivec_vcmpnezw_p:
     if (Subtarget.hasP9Altivec()) {
       switch (IntrinsicID) {
       default:
         llvm_unreachable("Unknown comparison intrinsic.");
       case Intrinsic::ppc_altivec_vcmpneb_p:
         CompareOpc = 7;
         break;
       case Intrinsic::ppc_altivec_vcmpneh_p:
         CompareOpc = 71;
         break;
       case Intrinsic::ppc_altivec_vcmpnew_p:
         CompareOpc = 135;
         break;
       case Intrinsic::ppc_altivec_vcmpnezb_p:
         CompareOpc = 263;
         break;
       case Intrinsic::ppc_altivec_vcmpnezh_p:
         CompareOpc = 327;
         break;
       case Intrinsic::ppc_altivec_vcmpnezw_p:
         CompareOpc = 391;
         break;
       }
       isDot = true;
     } else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpgefp_p:
     CompareOpc = 454;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtfp_p:
     CompareOpc = 710;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsb_p:
     CompareOpc = 774;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsh_p:
     CompareOpc = 838;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsw_p:
     CompareOpc = 902;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsd_p:
     if (Subtarget.hasP8Altivec()) {
       CompareOpc = 967;
       isDot = true;
     } else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpgtub_p:
     CompareOpc = 518;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtuh_p:
     CompareOpc = 582;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtuw_p:
     CompareOpc = 646;
     isDot = true;
     break;
   case Intrinsic::ppc_altivec_vcmpgtud_p:
     if (Subtarget.hasP8Altivec()) {
       CompareOpc = 711;
       isDot = true;
     } else
       return false;
     break;
 
   // VSX predicate comparisons use the same infrastructure
   case Intrinsic::ppc_vsx_xvcmpeqdp_p:
   case Intrinsic::ppc_vsx_xvcmpgedp_p:
   case Intrinsic::ppc_vsx_xvcmpgtdp_p:
   case Intrinsic::ppc_vsx_xvcmpeqsp_p:
   case Intrinsic::ppc_vsx_xvcmpgesp_p:
   case Intrinsic::ppc_vsx_xvcmpgtsp_p:
     if (Subtarget.hasVSX()) {
       switch (IntrinsicID) {
       case Intrinsic::ppc_vsx_xvcmpeqdp_p:
         CompareOpc = 99;
         break;
       case Intrinsic::ppc_vsx_xvcmpgedp_p:
         CompareOpc = 115;
         break;
       case Intrinsic::ppc_vsx_xvcmpgtdp_p:
         CompareOpc = 107;
         break;
       case Intrinsic::ppc_vsx_xvcmpeqsp_p:
         CompareOpc = 67;
         break;
       case Intrinsic::ppc_vsx_xvcmpgesp_p:
         CompareOpc = 83;
         break;
       case Intrinsic::ppc_vsx_xvcmpgtsp_p:
         CompareOpc = 75;
         break;
       }
       isDot = true;
     } else
       return false;
     break;
 
   // Normal Comparisons.
   case Intrinsic::ppc_altivec_vcmpbfp:
     CompareOpc = 966;
     break;
   case Intrinsic::ppc_altivec_vcmpeqfp:
     CompareOpc = 198;
     break;
   case Intrinsic::ppc_altivec_vcmpequb:
     CompareOpc = 6;
     break;
   case Intrinsic::ppc_altivec_vcmpequh:
     CompareOpc = 70;
     break;
   case Intrinsic::ppc_altivec_vcmpequw:
     CompareOpc = 134;
     break;
   case Intrinsic::ppc_altivec_vcmpequd:
     if (Subtarget.hasP8Altivec())
       CompareOpc = 199;
     else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpneb:
   case Intrinsic::ppc_altivec_vcmpneh:
   case Intrinsic::ppc_altivec_vcmpnew:
   case Intrinsic::ppc_altivec_vcmpnezb:
   case Intrinsic::ppc_altivec_vcmpnezh:
   case Intrinsic::ppc_altivec_vcmpnezw:
     if (Subtarget.hasP9Altivec())
       switch (IntrinsicID) {
       default:
         llvm_unreachable("Unknown comparison intrinsic.");
       case Intrinsic::ppc_altivec_vcmpneb:
         CompareOpc = 7;
         break;
       case Intrinsic::ppc_altivec_vcmpneh:
         CompareOpc = 71;
         break;
       case Intrinsic::ppc_altivec_vcmpnew:
         CompareOpc = 135;
         break;
       case Intrinsic::ppc_altivec_vcmpnezb:
         CompareOpc = 263;
         break;
       case Intrinsic::ppc_altivec_vcmpnezh:
         CompareOpc = 327;
         break;
       case Intrinsic::ppc_altivec_vcmpnezw:
         CompareOpc = 391;
         break;
       }
     else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpgefp:
     CompareOpc = 454;
     break;
   case Intrinsic::ppc_altivec_vcmpgtfp:
     CompareOpc = 710;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsb:
     CompareOpc = 774;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsh:
     CompareOpc = 838;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsw:
     CompareOpc = 902;
     break;
   case Intrinsic::ppc_altivec_vcmpgtsd:
     if (Subtarget.hasP8Altivec())
       CompareOpc = 967;
     else
       return false;
     break;
   case Intrinsic::ppc_altivec_vcmpgtub:
     CompareOpc = 518;
     break;
   case Intrinsic::ppc_altivec_vcmpgtuh:
     CompareOpc = 582;
     break;
   case Intrinsic::ppc_altivec_vcmpgtuw:
     CompareOpc = 646;
     break;
   case Intrinsic::ppc_altivec_vcmpgtud:
     if (Subtarget.hasP8Altivec())
       CompareOpc = 711;
     else
       return false;
     break;
   }
   return true;
 }
 
 /// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
 /// lower, do it, otherwise return null.
 SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
                                                    SelectionDAG &DAG) const {
   unsigned IntrinsicID =
     cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
 
   SDLoc dl(Op);
 
   if (IntrinsicID == Intrinsic::thread_pointer) {
     // Reads the thread pointer register, used for __builtin_thread_pointer.
     if (Subtarget.isPPC64())
       return DAG.getRegister(PPC::X13, MVT::i64);
     return DAG.getRegister(PPC::R2, MVT::i32);
   }
 
   // If this is a lowered altivec predicate compare, CompareOpc is set to the
   // opcode number of the comparison.
   int CompareOpc;
   bool isDot;
   if (!getVectorCompareInfo(Op, CompareOpc, isDot, Subtarget))
     return SDValue();    // Don't custom lower most intrinsics.
 
   // If this is a non-dot comparison, make the VCMP node and we are done.
   if (!isDot) {
     SDValue Tmp = DAG.getNode(PPCISD::VCMP, dl, Op.getOperand(2).getValueType(),
                               Op.getOperand(1), Op.getOperand(2),
                               DAG.getConstant(CompareOpc, dl, MVT::i32));
     return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Tmp);
   }
 
   // Create the PPCISD altivec 'dot' comparison node.
   SDValue Ops[] = {
     Op.getOperand(2),  // LHS
     Op.getOperand(3),  // RHS
     DAG.getConstant(CompareOpc, dl, MVT::i32)
   };
   EVT VTs[] = { Op.getOperand(2).getValueType(), MVT::Glue };
   SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops);
 
   // Now that we have the comparison, emit a copy from the CR to a GPR.
   // This is flagged to the above dot comparison.
   SDValue Flags = DAG.getNode(PPCISD::MFOCRF, dl, MVT::i32,
                                 DAG.getRegister(PPC::CR6, MVT::i32),
                                 CompNode.getValue(1));
 
   // Unpack the result based on how the target uses it.
   unsigned BitNo;   // Bit # of CR6.
   bool InvertBit;   // Invert result?
   switch (cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue()) {
   default:  // Can't happen, don't crash on invalid number though.
   case 0:   // Return the value of the EQ bit of CR6.
     BitNo = 0; InvertBit = false;
     break;
   case 1:   // Return the inverted value of the EQ bit of CR6.
     BitNo = 0; InvertBit = true;
     break;
   case 2:   // Return the value of the LT bit of CR6.
     BitNo = 2; InvertBit = false;
     break;
   case 3:   // Return the inverted value of the LT bit of CR6.
     BitNo = 2; InvertBit = true;
     break;
   }
 
   // Shift the bit into the low position.
   Flags = DAG.getNode(ISD::SRL, dl, MVT::i32, Flags,
                       DAG.getConstant(8 - (3 - BitNo), dl, MVT::i32));
   // Isolate the bit.
   Flags = DAG.getNode(ISD::AND, dl, MVT::i32, Flags,
                       DAG.getConstant(1, dl, MVT::i32));
 
   // If we are supposed to, toggle the bit.
   if (InvertBit)
     Flags = DAG.getNode(ISD::XOR, dl, MVT::i32, Flags,
                         DAG.getConstant(1, dl, MVT::i32));
   return Flags;
 }
 
 SDValue PPCTargetLowering::LowerINTRINSIC_VOID(SDValue Op,
                                                SelectionDAG &DAG) const {
   // SelectionDAGBuilder::visitTargetIntrinsic may insert one extra chain to
   // the beginning of the argument list.
   int ArgStart = isa<ConstantSDNode>(Op.getOperand(0)) ? 0 : 1;
   SDLoc DL(Op);
   switch (cast<ConstantSDNode>(Op.getOperand(ArgStart))->getZExtValue()) {
   case Intrinsic::ppc_cfence: {
     assert(ArgStart == 1 && "llvm.ppc.cfence must carry a chain argument.");
     assert(Subtarget.isPPC64() && "Only 64-bit is supported for now.");
     return SDValue(DAG.getMachineNode(PPC::CFENCE8, DL, MVT::Other,
                                       DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i64,
                                                   Op.getOperand(ArgStart + 1)),
                                       Op.getOperand(0)),
                    0);
   }
   default:
     break;
   }
   return SDValue();
 }
 
 SDValue PPCTargetLowering::LowerREM(SDValue Op, SelectionDAG &DAG) const {
   // Check for a DIV with the same operands as this REM.
   for (auto UI : Op.getOperand(1)->uses()) {
     if ((Op.getOpcode() == ISD::SREM && UI->getOpcode() == ISD::SDIV) ||
         (Op.getOpcode() == ISD::UREM && UI->getOpcode() == ISD::UDIV))
       if (UI->getOperand(0) == Op.getOperand(0) &&
           UI->getOperand(1) == Op.getOperand(1))
         return SDValue();
   }
   return Op;
 }
 
 // Lower scalar BSWAP64 to xxbrd.
 SDValue PPCTargetLowering::LowerBSWAP(SDValue Op, SelectionDAG &DAG) const {
   SDLoc dl(Op);
   // MTVSRDD
   Op = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v2i64, Op.getOperand(0),
                    Op.getOperand(0));
   // XXBRD
   Op = DAG.getNode(ISD::BSWAP, dl, MVT::v2i64, Op);
   // MFVSRD
   int VectorIndex = 0;
   if (Subtarget.isLittleEndian())
     VectorIndex = 1;
   Op = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Op,
                    DAG.getTargetConstant(VectorIndex, dl, MVT::i32));
   return Op;
 }
 
 // ATOMIC_CMP_SWAP for i8/i16 needs to zero-extend its input since it will be
 // compared to a value that is atomically loaded (atomic loads zero-extend).
 SDValue PPCTargetLowering::LowerATOMIC_CMP_SWAP(SDValue Op,
                                                 SelectionDAG &DAG) const {
   assert(Op.getOpcode() == ISD::ATOMIC_CMP_SWAP &&
          "Expecting an atomic compare-and-swap here.");
   SDLoc dl(Op);
   auto *AtomicNode = cast<AtomicSDNode>(Op.getNode());
   EVT MemVT = AtomicNode->getMemoryVT();
   if (MemVT.getSizeInBits() >= 32)
     return Op;
 
   SDValue CmpOp = Op.getOperand(2);
   // If this is already correctly zero-extended, leave it alone.
   auto HighBits = APInt::getHighBitsSet(32, 32 - MemVT.getSizeInBits());
   if (DAG.MaskedValueIsZero(CmpOp, HighBits))
     return Op;
 
   // Clear the high bits of the compare operand.
   unsigned MaskVal = (1 << MemVT.getSizeInBits()) - 1;
   SDValue NewCmpOp =
     DAG.getNode(ISD::AND, dl, MVT::i32, CmpOp,
                 DAG.getConstant(MaskVal, dl, MVT::i32));
 
   // Replace the existing compare operand with the properly zero-extended one.
   SmallVector<SDValue, 4> Ops;
   for (int i = 0, e = AtomicNode->getNumOperands(); i < e; i++)
     Ops.push_back(AtomicNode->getOperand(i));
   Ops[2] = NewCmpOp;
   MachineMemOperand *MMO = AtomicNode->getMemOperand();
   SDVTList Tys = DAG.getVTList(MVT::i32, MVT::Other);
   auto NodeTy =
     (MemVT == MVT::i8) ? PPCISD::ATOMIC_CMP_SWAP_8 : PPCISD::ATOMIC_CMP_SWAP_16;
   return DAG.getMemIntrinsicNode(NodeTy, dl, Tys, Ops, MemVT, MMO);
 }
 
 SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
                                                  SelectionDAG &DAG) const {
   SDLoc dl(Op);
   // Create a stack slot that is 16-byte aligned.
   MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
   int FrameIdx = MFI.CreateStackObject(16, 16, false);
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
   // Store the input value into Value#0 of the stack slot.
   SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0), FIdx,
                                MachinePointerInfo());
   // Load it out.
   return DAG.getLoad(Op.getValueType(), dl, Store, FIdx, MachinePointerInfo());
 }
 
 SDValue PPCTargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
                                                   SelectionDAG &DAG) const {
   assert(Op.getOpcode() == ISD::INSERT_VECTOR_ELT &&
          "Should only be called for ISD::INSERT_VECTOR_ELT");
 
   ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(2));
   // We have legal lowering for constant indices but not for variable ones.
   if (!C)
     return SDValue();
 
   EVT VT = Op.getValueType();
   SDLoc dl(Op);
   SDValue V1 = Op.getOperand(0);
   SDValue V2 = Op.getOperand(1);
   // We can use MTVSRZ + VECINSERT for v8i16 and v16i8 types.
   if (VT == MVT::v8i16 || VT == MVT::v16i8) {
     SDValue Mtvsrz = DAG.getNode(PPCISD::MTVSRZ, dl, VT, V2);
     unsigned BytesInEachElement = VT.getVectorElementType().getSizeInBits() / 8;
     unsigned InsertAtElement = C->getZExtValue();
     unsigned InsertAtByte = InsertAtElement * BytesInEachElement;
     if (Subtarget.isLittleEndian()) {
       InsertAtByte = (16 - BytesInEachElement) - InsertAtByte;
     }
     return DAG.getNode(PPCISD::VECINSERT, dl, VT, V1, Mtvsrz,
                        DAG.getConstant(InsertAtByte, dl, MVT::i32));
   }
   return Op;
 }
 
 SDValue PPCTargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
                                                    SelectionDAG &DAG) const {
   SDLoc dl(Op);
   SDNode *N = Op.getNode();
 
   assert(N->getOperand(0).getValueType() == MVT::v4i1 &&
          "Unknown extract_vector_elt type");
 
   SDValue Value = N->getOperand(0);
 
   // The first part of this is like the store lowering except that we don't
   // need to track the chain.
 
   // The values are now known to be -1 (false) or 1 (true). To convert this
   // into 0 (false) and 1 (true), add 1 and then divide by 2 (multiply by 0.5).
   // This can be done with an fma and the 0.5 constant: (V+1.0)*0.5 = 0.5*V+0.5
   Value = DAG.getNode(PPCISD::QBFLT, dl, MVT::v4f64, Value);
 
   // FIXME: We can make this an f32 vector, but the BUILD_VECTOR code needs to
   // understand how to form the extending load.
   SDValue FPHalfs = DAG.getConstantFP(0.5, dl, MVT::v4f64);
 
   Value = DAG.getNode(ISD::FMA, dl, MVT::v4f64, Value, FPHalfs, FPHalfs);
 
   // Now convert to an integer and store.
   Value = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f64,
     DAG.getConstant(Intrinsic::ppc_qpx_qvfctiwu, dl, MVT::i32),
     Value);
 
   MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
   int FrameIdx = MFI.CreateStackObject(16, 16, false);
   MachinePointerInfo PtrInfo =
       MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx);
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
   SDValue StoreChain = DAG.getEntryNode();
   SDValue Ops[] = {StoreChain,
                    DAG.getConstant(Intrinsic::ppc_qpx_qvstfiw, dl, MVT::i32),
                    Value, FIdx};
   SDVTList VTs = DAG.getVTList(/*chain*/ MVT::Other);
 
   StoreChain = DAG.getMemIntrinsicNode(ISD::INTRINSIC_VOID,
     dl, VTs, Ops, MVT::v4i32, PtrInfo);
 
   // Extract the value requested.
   unsigned Offset = 4*cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
   SDValue Idx = DAG.getConstant(Offset, dl, FIdx.getValueType());
   Idx = DAG.getNode(ISD::ADD, dl, FIdx.getValueType(), FIdx, Idx);
 
   SDValue IntVal =
       DAG.getLoad(MVT::i32, dl, StoreChain, Idx, PtrInfo.getWithOffset(Offset));
 
   if (!Subtarget.useCRBits())
     return IntVal;
 
   return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, IntVal);
 }
 
 /// Lowering for QPX v4i1 loads
 SDValue PPCTargetLowering::LowerVectorLoad(SDValue Op,
                                            SelectionDAG &DAG) const {
   SDLoc dl(Op);
   LoadSDNode *LN = cast<LoadSDNode>(Op.getNode());
   SDValue LoadChain = LN->getChain();
   SDValue BasePtr = LN->getBasePtr();
 
   if (Op.getValueType() == MVT::v4f64 ||
       Op.getValueType() == MVT::v4f32) {
     EVT MemVT = LN->getMemoryVT();
     unsigned Alignment = LN->getAlignment();
 
     // If this load is properly aligned, then it is legal.
     if (Alignment >= MemVT.getStoreSize())
       return Op;
 
     EVT ScalarVT = Op.getValueType().getScalarType(),
         ScalarMemVT = MemVT.getScalarType();
     unsigned Stride = ScalarMemVT.getStoreSize();
 
     SDValue Vals[4], LoadChains[4];
     for (unsigned Idx = 0; Idx < 4; ++Idx) {
       SDValue Load;
       if (ScalarVT != ScalarMemVT)
         Load = DAG.getExtLoad(LN->getExtensionType(), dl, ScalarVT, LoadChain,
                               BasePtr,
                               LN->getPointerInfo().getWithOffset(Idx * Stride),
                               ScalarMemVT, MinAlign(Alignment, Idx * Stride),
                               LN->getMemOperand()->getFlags(), LN->getAAInfo());
       else
         Load = DAG.getLoad(ScalarVT, dl, LoadChain, BasePtr,
                            LN->getPointerInfo().getWithOffset(Idx * Stride),
                            MinAlign(Alignment, Idx * Stride),
                            LN->getMemOperand()->getFlags(), LN->getAAInfo());
 
       if (Idx == 0 && LN->isIndexed()) {
         assert(LN->getAddressingMode() == ISD::PRE_INC &&
                "Unknown addressing mode on vector load");
         Load = DAG.getIndexedLoad(Load, dl, BasePtr, LN->getOffset(),
                                   LN->getAddressingMode());
       }
 
       Vals[Idx] = Load;
       LoadChains[Idx] = Load.getValue(1);
 
       BasePtr = DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(), BasePtr,
                             DAG.getConstant(Stride, dl,
                                             BasePtr.getValueType()));
     }
 
     SDValue TF =  DAG.getNode(ISD::TokenFactor, dl, MVT::Other, LoadChains);
     SDValue Value = DAG.getBuildVector(Op.getValueType(), dl, Vals);
 
     if (LN->isIndexed()) {
       SDValue RetOps[] = { Value, Vals[0].getValue(1), TF };
       return DAG.getMergeValues(RetOps, dl);
     }
 
     SDValue RetOps[] = { Value, TF };
     return DAG.getMergeValues(RetOps, dl);
   }
 
   assert(Op.getValueType() == MVT::v4i1 && "Unknown load to lower");
   assert(LN->isUnindexed() && "Indexed v4i1 loads are not supported");
 
   // To lower v4i1 from a byte array, we load the byte elements of the
   // vector and then reuse the BUILD_VECTOR logic.
 
   SDValue VectElmts[4], VectElmtChains[4];
   for (unsigned i = 0; i < 4; ++i) {
     SDValue Idx = DAG.getConstant(i, dl, BasePtr.getValueType());
     Idx = DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(), BasePtr, Idx);
 
     VectElmts[i] = DAG.getExtLoad(
         ISD::EXTLOAD, dl, MVT::i32, LoadChain, Idx,
         LN->getPointerInfo().getWithOffset(i), MVT::i8,
         /* Alignment = */ 1, LN->getMemOperand()->getFlags(), LN->getAAInfo());
     VectElmtChains[i] = VectElmts[i].getValue(1);
   }
 
   LoadChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, VectElmtChains);
   SDValue Value = DAG.getBuildVector(MVT::v4i1, dl, VectElmts);
 
   SDValue RVals[] = { Value, LoadChain };
   return DAG.getMergeValues(RVals, dl);
 }
 
 /// Lowering for QPX v4i1 stores
 SDValue PPCTargetLowering::LowerVectorStore(SDValue Op,
                                             SelectionDAG &DAG) const {
   SDLoc dl(Op);
   StoreSDNode *SN = cast<StoreSDNode>(Op.getNode());
   SDValue StoreChain = SN->getChain();
   SDValue BasePtr = SN->getBasePtr();
   SDValue Value = SN->getValue();
 
   if (Value.getValueType() == MVT::v4f64 ||
       Value.getValueType() == MVT::v4f32) {
     EVT MemVT = SN->getMemoryVT();
     unsigned Alignment = SN->getAlignment();
 
     // If this store is properly aligned, then it is legal.
     if (Alignment >= MemVT.getStoreSize())
       return Op;
 
     EVT ScalarVT = Value.getValueType().getScalarType(),
         ScalarMemVT = MemVT.getScalarType();
     unsigned Stride = ScalarMemVT.getStoreSize();
 
     SDValue Stores[4];
     for (unsigned Idx = 0; Idx < 4; ++Idx) {
       SDValue Ex = DAG.getNode(
           ISD::EXTRACT_VECTOR_ELT, dl, ScalarVT, Value,
           DAG.getConstant(Idx, dl, getVectorIdxTy(DAG.getDataLayout())));
       SDValue Store;
       if (ScalarVT != ScalarMemVT)
         Store =
             DAG.getTruncStore(StoreChain, dl, Ex, BasePtr,
                               SN->getPointerInfo().getWithOffset(Idx * Stride),
                               ScalarMemVT, MinAlign(Alignment, Idx * Stride),
                               SN->getMemOperand()->getFlags(), SN->getAAInfo());
       else
         Store = DAG.getStore(StoreChain, dl, Ex, BasePtr,
                              SN->getPointerInfo().getWithOffset(Idx * Stride),
                              MinAlign(Alignment, Idx * Stride),
                              SN->getMemOperand()->getFlags(), SN->getAAInfo());
 
       if (Idx == 0 && SN->isIndexed()) {
         assert(SN->getAddressingMode() == ISD::PRE_INC &&
                "Unknown addressing mode on vector store");
         Store = DAG.getIndexedStore(Store, dl, BasePtr, SN->getOffset(),
                                     SN->getAddressingMode());
       }
 
       BasePtr = DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(), BasePtr,
                             DAG.getConstant(Stride, dl,
                                             BasePtr.getValueType()));
       Stores[Idx] = Store;
     }
 
     SDValue TF =  DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Stores);
 
     if (SN->isIndexed()) {
       SDValue RetOps[] = { TF, Stores[0].getValue(1) };
       return DAG.getMergeValues(RetOps, dl);
     }
 
     return TF;
   }
 
   assert(SN->isUnindexed() && "Indexed v4i1 stores are not supported");
   assert(Value.getValueType() == MVT::v4i1 && "Unknown store to lower");
 
   // The values are now known to be -1 (false) or 1 (true). To convert this
   // into 0 (false) and 1 (true), add 1 and then divide by 2 (multiply by 0.5).
   // This can be done with an fma and the 0.5 constant: (V+1.0)*0.5 = 0.5*V+0.5
   Value = DAG.getNode(PPCISD::QBFLT, dl, MVT::v4f64, Value);
 
   // FIXME: We can make this an f32 vector, but the BUILD_VECTOR code needs to
   // understand how to form the extending load.
   SDValue FPHalfs = DAG.getConstantFP(0.5, dl, MVT::v4f64);
 
   Value = DAG.getNode(ISD::FMA, dl, MVT::v4f64, Value, FPHalfs, FPHalfs);
 
   // Now convert to an integer and store.
   Value = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::v4f64,
     DAG.getConstant(Intrinsic::ppc_qpx_qvfctiwu, dl, MVT::i32),
     Value);
 
   MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
   int FrameIdx = MFI.CreateStackObject(16, 16, false);
   MachinePointerInfo PtrInfo =
       MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FrameIdx);
   EVT PtrVT = getPointerTy(DAG.getDataLayout());
   SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
 
   SDValue Ops[] = {StoreChain,
                    DAG.getConstant(Intrinsic::ppc_qpx_qvstfiw, dl, MVT::i32),
                    Value, FIdx};
   SDVTList VTs = DAG.getVTList(/*chain*/ MVT::Other);
 
   StoreChain = DAG.getMemIntrinsicNode(ISD::INTRINSIC_VOID,
     dl, VTs, Ops, MVT::v4i32, PtrInfo);
 
   // Move data into the byte array.
   SDValue Loads[4], LoadChains[4];
   for (unsigned i = 0; i < 4; ++i) {
     unsigned Offset = 4*i;
     SDValue Idx = DAG.getConstant(Offset, dl, FIdx.getValueType());
     Idx = DAG.getNode(ISD::ADD, dl, FIdx.getValueType(), FIdx, Idx);
 
     Loads[i] = DAG.getLoad(MVT::i32, dl, StoreChain, Idx,
                            PtrInfo.getWithOffset(Offset));
     LoadChains[i] = Loads[i].getValue(1);
   }
 
   StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, LoadChains);
 
   SDValue Stores[4];
   for (unsigned i = 0; i < 4; ++i) {
     SDValue Idx = DAG.getConstant(i, dl, BasePtr.getValueType());
     Idx = DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(), BasePtr, Idx);
 
     Stores[i] = DAG.getTruncStore(
         StoreChain, dl, Loads[i], Idx, SN->getPointerInfo().getWithOffset(i),
         MVT::i8, /* Alignment = */ 1, SN->getMemOperand()->getFlags(),
         SN->getAAInfo());
   }
 
   StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Stores);
 
   return StoreChain;
 }
 
 SDValue PPCTargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) const {
   SDLoc dl(Op);
   if (Op.getValueType() == MVT::v4i32) {
     SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
 
     SDValue Zero  = BuildSplatI(  0, 1, MVT::v4i32, DAG, dl);
     SDValue Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG, dl);//+16 as shift amt.
 
     SDValue RHSSwap =   // = vrlw RHS, 16
       BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG, dl);
 
     // Shrinkify inputs to v8i16.
     LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, LHS);
     RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHS);
     RHSSwap = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHSSwap);
 
     // Low parts multiplied together, generating 32-bit results (we ignore the
     // top parts).
     SDValue LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
                                         LHS, RHS, DAG, dl, MVT::v4i32);
 
     SDValue HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
                                       LHS, RHSSwap, Zero, DAG, dl, MVT::v4i32);
     // Shift the high parts up 16 bits.
     HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd,
                               Neg16, DAG, dl);
     return DAG.getNode(ISD::ADD, dl, MVT::v4i32, LoProd, HiProd);
   } else if (Op.getValueType() == MVT::v8i16) {
     SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
 
     SDValue Zero = BuildSplatI(0, 1, MVT::v8i16, DAG, dl);
 
     return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
                             LHS, RHS, Zero, DAG, dl);
   } else if (Op.getValueType() == MVT::v16i8) {
     SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
     bool isLittleEndian = Subtarget.isLittleEndian();
 
     // Multiply the even 8-bit parts, producing 16-bit sums.
     SDValue EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
                                            LHS, RHS, DAG, dl, MVT::v8i16);
     EvenParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, EvenParts);
 
     // Multiply the odd 8-bit parts, producing 16-bit sums.
     SDValue OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
                                           LHS, RHS, DAG, dl, MVT::v8i16);
     OddParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OddParts);
 
     // Merge the results together.  Because vmuleub and vmuloub are
     // instructions with a big-endian bias, we must reverse the
     // element numbering and reverse the meaning of "odd" and "even"
     // when generating little endian code.
     int Ops[16];
     for (unsigned i = 0; i != 8; ++i) {
       if (isLittleEndian) {
         Ops[i*2  ] = 2*i;
         Ops[i*2+1] = 2*i+16;
       } else {
         Ops[i*2  ] = 2*i+1;
         Ops[i*2+1] = 2*i+1+16;
       }
     }
     if (isLittleEndian)
       return DAG.getVectorShuffle(MVT::v16i8, dl, OddParts, EvenParts, Ops);
     else
       return DAG.getVectorShuffle(MVT::v16i8, dl, EvenParts, OddParts, Ops);
   } else {
     llvm_unreachable("Unknown mul to lower!");
   }
 }
 
 SDValue PPCTargetLowering::LowerABS(SDValue Op, SelectionDAG &DAG) const {
 
   assert(Op.getOpcode() == ISD::ABS && "Should only be called for ISD::ABS");
 
   EVT VT = Op.getValueType();
   assert(VT.isVector() &&
          "Only set vector abs as custom, scalar abs shouldn't reach here!");
   assert((VT == MVT::v2i64 || VT == MVT::v4i32 || VT == MVT::v8i16 ||
           VT == MVT::v16i8) &&
          "Unexpected vector element type!");
   assert((VT != MVT::v2i64 || Subtarget.hasP8Altivec()) &&
          "Current subtarget doesn't support smax v2i64!");
 
   // For vector abs, it can be lowered to:
   // abs x
   // ==>
   // y = -x
   // smax(x, y)
 
   SDLoc dl(Op);
   SDValue X = Op.getOperand(0);
   SDValue Zero = DAG.getConstant(0, dl, VT);
   SDValue Y = DAG.getNode(ISD::SUB, dl, VT, Zero, X);
 
   // SMAX patch https://reviews.llvm.org/D47332
   // hasn't landed yet, so use intrinsic first here.
   // TODO: Should use SMAX directly once SMAX patch landed
   Intrinsic::ID BifID = Intrinsic::ppc_altivec_vmaxsw;
   if (VT == MVT::v2i64)
     BifID = Intrinsic::ppc_altivec_vmaxsd;
   else if (VT == MVT::v8i16)
     BifID = Intrinsic::ppc_altivec_vmaxsh;
   else if (VT == MVT::v16i8)
     BifID = Intrinsic::ppc_altivec_vmaxsb;
 
   return BuildIntrinsicOp(BifID, X, Y, DAG, dl, VT);
 }
 
 // Custom lowering for fpext vf32 to v2f64
 SDValue PPCTargetLowering::LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) const {
 
   assert(Op.getOpcode() == ISD::FP_EXTEND &&
          "Should only be called for ISD::FP_EXTEND");
 
   // We only want to custom lower an extend from v2f32 to v2f64.
   if (Op.getValueType() != MVT::v2f64 ||
       Op.getOperand(0).getValueType() != MVT::v2f32)
     return SDValue();
 
   SDLoc dl(Op);
   SDValue Op0 = Op.getOperand(0);
 
   switch (Op0.getOpcode()) {
   default:
     return SDValue();
   case ISD::EXTRACT_SUBVECTOR: {
     assert(Op0.getNumOperands() == 2 &&
            isa<ConstantSDNode>(Op0->getOperand(1)) &&
            "Node should have 2 operands with second one being a constant!");
 
     if (Op0.getOperand(0).getValueType() != MVT::v4f32)
       return SDValue();
 
     // Custom lower is only done for high or low doubleword.
     int Idx = cast<ConstantSDNode>(Op0.getOperand(1))->getZExtValue();
     if (Idx % 2 != 0)
       return SDValue();
 
     // Since input is v4f32, at this point Idx is either 0 or 2.
     // Shift to get the doubleword position we want.
     int DWord = Idx >> 1;
 
     // High and low word positions are different on little endian.
     if (Subtarget.isLittleEndian())
       DWord ^= 0x1;
 
     return DAG.getNode(PPCISD::FP_EXTEND_HALF, dl, MVT::v2f64,
                        Op0.getOperand(0), DAG.getConstant(DWord, dl, MVT::i32));
   }
   case ISD::FADD:
   case ISD::FMUL:
   case ISD::FSUB: {
     SDValue NewLoad[2];
     for (unsigned i = 0, ie = Op0.getNumOperands(); i != ie; ++i) {
       // Ensure both input are loads.
       SDValue LdOp = Op0.getOperand(i);
       if (LdOp.getOpcode() != ISD::LOAD)
         return SDValue();
       // Generate new load node.
       LoadSDNode *LD = cast<LoadSDNode>(LdOp);
       SDValue LoadOps[] = {LD->getChain(), LD->getBasePtr()};
       NewLoad[i] = DAG.getMemIntrinsicNode(
           PPCISD::LD_VSX_LH, dl, DAG.getVTList(MVT::v4f32, MVT::Other), LoadOps,
           LD->getMemoryVT(), LD->getMemOperand());
     }
     SDValue NewOp =
         DAG.getNode(Op0.getOpcode(), SDLoc(Op0), MVT::v4f32, NewLoad[0],
                     NewLoad[1], Op0.getNode()->getFlags());
     return DAG.getNode(PPCISD::FP_EXTEND_HALF, dl, MVT::v2f64, NewOp,
                        DAG.getConstant(0, dl, MVT::i32));
   }
   case ISD::LOAD: {
     LoadSDNode *LD = cast<LoadSDNode>(Op0);
     SDValue LoadOps[] = {LD->getChain(), LD->getBasePtr()};
     SDValue NewLd = DAG.getMemIntrinsicNode(
         PPCISD::LD_VSX_LH, dl, DAG.getVTList(MVT::v4f32, MVT::Other), LoadOps,
         LD->getMemoryVT(), LD->getMemOperand());
     return DAG.getNode(PPCISD::FP_EXTEND_HALF, dl, MVT::v2f64, NewLd,
                        DAG.getConstant(0, dl, MVT::i32));
   }
   }
   llvm_unreachable("ERROR:Should return for all cases within swtich.");
 }
 
 /// LowerOperation - Provide custom lowering hooks for some operations.
 ///
 SDValue PPCTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
   switch (Op.getOpcode()) {
   default: llvm_unreachable("Wasn't expecting to be able to lower this!");
   case ISD::ConstantPool:       return LowerConstantPool(Op, DAG);
   case ISD::BlockAddress:       return LowerBlockAddress(Op, DAG);
   case ISD::GlobalAddress:      return LowerGlobalAddress(Op, DAG);
   case ISD::GlobalTLSAddress:   return LowerGlobalTLSAddress(Op, DAG);
   case ISD::JumpTable:          return LowerJumpTable(Op, DAG);
   case ISD::SETCC:              return LowerSETCC(Op, DAG);
   case ISD::INIT_TRAMPOLINE:    return LowerINIT_TRAMPOLINE(Op, DAG);
   case ISD::ADJUST_TRAMPOLINE:  return LowerADJUST_TRAMPOLINE(Op, DAG);
 
   // Variable argument lowering.
   case ISD::VASTART:            return LowerVASTART(Op, DAG);
   case ISD::VAARG:              return LowerVAARG(Op, DAG);
   case ISD::VACOPY:             return LowerVACOPY(Op, DAG);
 
   case ISD::STACKRESTORE:       return LowerSTACKRESTORE(Op, DAG);
   case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
   case ISD::GET_DYNAMIC_AREA_OFFSET:
     return LowerGET_DYNAMIC_AREA_OFFSET(Op, DAG);
 
   // Exception handling lowering.
   case ISD::EH_DWARF_CFA:       return LowerEH_DWARF_CFA(Op, DAG);
   case ISD::EH_SJLJ_SETJMP:     return lowerEH_SJLJ_SETJMP(Op, DAG);
   case ISD::EH_SJLJ_LONGJMP:    return lowerEH_SJLJ_LONGJMP(Op, DAG);
 
   case ISD::LOAD:               return LowerLOAD(Op, DAG);
   case ISD::STORE:              return LowerSTORE(Op, DAG);
   case ISD::TRUNCATE:           return LowerTRUNCATE(Op, DAG);
   case ISD::SELECT_CC:          return LowerSELECT_CC(Op, DAG);
   case ISD::FP_TO_UINT:
   case ISD::FP_TO_SINT:         return LowerFP_TO_INT(Op, DAG, SDLoc(Op));
   case ISD::UINT_TO_FP:
   case ISD::SINT_TO_FP:         return LowerINT_TO_FP(Op, DAG);
   case ISD::FLT_ROUNDS_:        return LowerFLT_ROUNDS_(Op, DAG);
 
   // Lower 64-bit shifts.
   case ISD::SHL_PARTS:          return LowerSHL_PARTS(Op, DAG);
   case ISD::SRL_PARTS:          return LowerSRL_PARTS(Op, DAG);
   case ISD::SRA_PARTS:          return LowerSRA_PARTS(Op, DAG);
 
   // Vector-related lowering.
   case ISD::BUILD_VECTOR:       return LowerBUILD_VECTOR(Op, DAG);
   case ISD::VECTOR_SHUFFLE:     return LowerVECTOR_SHUFFLE(Op, DAG);
   case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
   case ISD::SCALAR_TO_VECTOR:   return LowerSCALAR_TO_VECTOR(Op, DAG);
   case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
   case ISD::INSERT_VECTOR_ELT:  return LowerINSERT_VECTOR_ELT(Op, DAG);
   case ISD::MUL:                return LowerMUL(Op, DAG);
   case ISD::ABS:                return LowerABS(Op, DAG);
   case ISD::FP_EXTEND:          return LowerFP_EXTEND(Op, DAG);
 
   // For counter-based loop handling.
   case ISD::INTRINSIC_W_CHAIN:  return SDValue();
 
   case ISD::BITCAST:            return LowerBITCAST(Op, DAG);
 
   // Frame & Return address.
   case ISD::RETURNADDR:         return LowerRETURNADDR(Op, DAG);
   case ISD::FRAMEADDR:          return LowerFRAMEADDR(Op, DAG);
 
   case ISD::INTRINSIC_VOID:
     return LowerINTRINSIC_VOID(Op, DAG);
   case ISD::SREM:
   case ISD::UREM:
     return LowerREM(Op, DAG);
   case ISD::BSWAP:
     return LowerBSWAP(Op, DAG);
   case ISD::ATOMIC_CMP_SWAP:
     return LowerATOMIC_CMP_SWAP(Op, DAG);
   }
 }
 
 void PPCTargetLowering::ReplaceNodeResults(SDNode *N,
                                            SmallVectorImpl<SDValue>&Results,
                                            SelectionDAG &DAG) const {
   SDLoc dl(N);
   switch (N->getOpcode()) {
   default:
     llvm_unreachable("Do not know how to custom type legalize this operation!");
   case ISD::READCYCLECOUNTER: {
     SDVTList VTs = DAG.getVTList(MVT::i32, MVT::i32, MVT::Other);
     SDValue RTB = DAG.getNode(PPCISD::READ_TIME_BASE, dl, VTs, N->getOperand(0));
 
     Results.push_back(RTB);
     Results.push_back(RTB.getValue(1));
     Results.push_back(RTB.getValue(2));
     break;
   }
   case ISD::INTRINSIC_W_CHAIN: {
     if (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() !=
         Intrinsic::loop_decrement)
       break;
 
     assert(N->getValueType(0) == MVT::i1 &&
            "Unexpected result type for CTR decrement intrinsic");
     EVT SVT = getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(),
                                  N->getValueType(0));
     SDVTList VTs = DAG.getVTList(SVT, MVT::Other);
     SDValue NewInt = DAG.getNode(N->getOpcode(), dl, VTs, N->getOperand(0),
                                  N->getOperand(1));
 
     Results.push_back(DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, NewInt));
     Results.push_back(NewInt.getValue(1));
     break;
   }
   case ISD::VAARG: {
     if (!Subtarget.isSVR4ABI() || Subtarget.isPPC64())
       return;
 
     EVT VT = N->getValueType(0);
 
     if (VT == MVT::i64) {
       SDValue NewNode = LowerVAARG(SDValue(N, 1), DAG);
 
       Results.push_back(NewNode);
       Results.push_back(NewNode.getValue(1));
     }
     return;
   }
   case ISD::FP_TO_SINT:
   case ISD::FP_TO_UINT:
     // LowerFP_TO_INT() can only handle f32 and f64.
     if (N->getOperand(0).getValueType() == MVT::ppcf128)
       return;
     Results.push_back(LowerFP_TO_INT(SDValue(N, 0), DAG, dl));
     return;
   case ISD::TRUNCATE: {
     EVT TrgVT = N->getValueType(0);
     EVT OpVT = N->getOperand(0).getValueType();
     if (TrgVT.isVector() &&
         isOperationCustom(N->getOpcode(), TrgVT) &&
         OpVT.getSizeInBits() <= 128 &&
         isPowerOf2_32(OpVT.getVectorElementType().getSizeInBits()))
       Results.push_back(LowerTRUNCATEVector(SDValue(N, 0), DAG));
     return;
   }
   case ISD::BITCAST:
     // Don't handle bitcast here.
     return;
   }
 }
 
 //===----------------------------------------------------------------------===//
 //  Other Lowering Code
 //===----------------------------------------------------------------------===//
 
 static Instruction* callIntrinsic(IRBuilder<> &Builder, Intrinsic::ID Id) {
   Module *M = Builder.GetInsertBlock()->getParent()->getParent();
   Function *Func = Intrinsic::getDeclaration(M, Id);
   return Builder.CreateCall(Func, {});
 }
 
 // The mappings for emitLeading/TrailingFence is taken from
 // http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
 Instruction *PPCTargetLowering::emitLeadingFence(IRBuilder<> &Builder,
                                                  Instruction *Inst,
                                                  AtomicOrdering Ord) const {
   if (Ord == AtomicOrdering::SequentiallyConsistent)
     return callIntrinsic(Builder, Intrinsic::ppc_sync);
   if (isReleaseOrStronger(Ord))
     return callIntrinsic(Builder, Intrinsic::ppc_lwsync);
   return nullptr;
 }
 
 Instruction *PPCTargetLowering::emitTrailingFence(IRBuilder<> &Builder,
                                                   Instruction *Inst,
                                                   AtomicOrdering Ord) const {
   if (Inst->hasAtomicLoad() && isAcquireOrStronger(Ord)) {
     // See http://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html and
     // http://www.rdrop.com/users/paulmck/scalability/paper/N2745r.2011.03.04a.html
     // and http://www.cl.cam.ac.uk/~pes20/cppppc/ for justification.
     if (isa<LoadInst>(Inst) && Subtarget.isPPC64())
       return Builder.CreateCall(
           Intrinsic::getDeclaration(
               Builder.GetInsertBlock()->getParent()->getParent(),
               Intrinsic::ppc_cfence, {Inst->getType()}),
           {Inst});
     // FIXME: Can use isync for rmw operation.
     return callIntrinsic(Builder, Intrinsic::ppc_lwsync);
   }
   return nullptr;
 }
 
 MachineBasicBlock *
 PPCTargetLowering::EmitAtomicBinary(MachineInstr &MI, MachineBasicBlock *BB,
                                     unsigned AtomicSize,
                                     unsigned BinOpcode,
                                     unsigned CmpOpcode,
                                     unsigned CmpPred) const {
   // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
 
   auto LoadMnemonic = PPC::LDARX;
   auto StoreMnemonic = PPC::STDCX;
   switch (AtomicSize) {
   default:
     llvm_unreachable("Unexpected size of atomic entity");
   case 1:
     LoadMnemonic = PPC::LBARX;
     StoreMnemonic = PPC::STBCX;
     assert(Subtarget.hasPartwordAtomics() && "Call this only with size >=4");
     break;
   case 2:
     LoadMnemonic = PPC::LHARX;
     StoreMnemonic = PPC::STHCX;
     assert(Subtarget.hasPartwordAtomics() && "Call this only with size >=4");
     break;
   case 4:
     LoadMnemonic = PPC::LWARX;
     StoreMnemonic = PPC::STWCX;
     break;
   case 8:
     LoadMnemonic = PPC::LDARX;
     StoreMnemonic = PPC::STDCX;
     break;
   }
 
   const BasicBlock *LLVM_BB = BB->getBasicBlock();
   MachineFunction *F = BB->getParent();
   MachineFunction::iterator It = ++BB->getIterator();
 
   Register dest = MI.getOperand(0).getReg();
   Register ptrA = MI.getOperand(1).getReg();
   Register ptrB = MI.getOperand(2).getReg();
   Register incr = MI.getOperand(3).getReg();
   DebugLoc dl = MI.getDebugLoc();
 
   MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
   MachineBasicBlock *loop2MBB =
     CmpOpcode ? F->CreateMachineBasicBlock(LLVM_BB) : nullptr;
   MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
   F->insert(It, loopMBB);
   if (CmpOpcode)
     F->insert(It, loop2MBB);
   F->insert(It, exitMBB);
   exitMBB->splice(exitMBB->begin(), BB,
                   std::next(MachineBasicBlock::iterator(MI)), BB->end());
   exitMBB->transferSuccessorsAndUpdatePHIs(BB);
 
   MachineRegisterInfo &RegInfo = F->getRegInfo();
   Register TmpReg = (!BinOpcode) ? incr :
     RegInfo.createVirtualRegister( AtomicSize == 8 ? &PPC::G8RCRegClass
                                            : &PPC::GPRCRegClass);
 
   //  thisMBB:
   //   ...
   //   fallthrough --> loopMBB
   BB->addSuccessor(loopMBB);
 
   //  loopMBB:
   //   l[wd]arx dest, ptr
   //   add r0, dest, incr
   //   st[wd]cx. r0, ptr
   //   bne- loopMBB
   //   fallthrough --> exitMBB
 
   // For max/min...
   //  loopMBB:
   //   l[wd]arx dest, ptr
   //   cmpl?[wd] incr, dest
   //   bgt exitMBB
   //  loop2MBB:
   //   st[wd]cx. dest, ptr
   //   bne- loopMBB
   //   fallthrough --> exitMBB
 
   BB = loopMBB;
   BuildMI(BB, dl, TII->get(LoadMnemonic), dest)
     .addReg(ptrA).addReg(ptrB);
   if (BinOpcode)
     BuildMI(BB, dl, TII->get(BinOpcode), TmpReg).addReg(incr).addReg(dest);
   if (CmpOpcode) {
     // Signed comparisons of byte or halfword values must be sign-extended.
     if (CmpOpcode == PPC::CMPW && AtomicSize < 4) {
       Register ExtReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
       BuildMI(BB, dl, TII->get(AtomicSize == 1 ? PPC::EXTSB : PPC::EXTSH),
               ExtReg).addReg(dest);
       BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0)
         .addReg(incr).addReg(ExtReg);
     } else
       BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0)
         .addReg(incr).addReg(dest);
 
     BuildMI(BB, dl, TII->get(PPC::BCC))
       .addImm(CmpPred).addReg(PPC::CR0).addMBB(exitMBB);
     BB->addSuccessor(loop2MBB);
     BB->addSuccessor(exitMBB);
     BB = loop2MBB;
   }
   BuildMI(BB, dl, TII->get(StoreMnemonic))
     .addReg(TmpReg).addReg(ptrA).addReg(ptrB);
   BuildMI(BB, dl, TII->get(PPC::BCC))
     .addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
   BB->addSuccessor(loopMBB);
   BB->addSuccessor(exitMBB);
 
   //  exitMBB:
   //   ...
   BB = exitMBB;
   return BB;
 }
 
 MachineBasicBlock *PPCTargetLowering::EmitPartwordAtomicBinary(
     MachineInstr &MI, MachineBasicBlock *BB,
     bool is8bit, // operation
     unsigned BinOpcode, unsigned CmpOpcode, unsigned CmpPred) const {
   // If we support part-word atomic mnemonics, just use them
   if (Subtarget.hasPartwordAtomics())
     return EmitAtomicBinary(MI, BB, is8bit ? 1 : 2, BinOpcode, CmpOpcode,
                             CmpPred);
 
   // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
   // In 64 bit mode we have to use 64 bits for addresses, even though the
   // lwarx/stwcx are 32 bits.  With the 32-bit atomics we can use address
   // registers without caring whether they're 32 or 64, but here we're
   // doing actual arithmetic on the addresses.
   bool is64bit = Subtarget.isPPC64();
   bool isLittleEndian = Subtarget.isLittleEndian();
   unsigned ZeroReg = is64bit ? PPC::ZERO8 : PPC::ZERO;
 
   const BasicBlock *LLVM_BB = BB->getBasicBlock();
   MachineFunction *F = BB->getParent();
   MachineFunction::iterator It = ++BB->getIterator();
 
   Register dest = MI.getOperand(0).getReg();
   Register ptrA = MI.getOperand(1).getReg();
   Register ptrB = MI.getOperand(2).getReg();
   Register incr = MI.getOperand(3).getReg();
   DebugLoc dl = MI.getDebugLoc();
 
   MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
   MachineBasicBlock *loop2MBB =
       CmpOpcode ? F->CreateMachineBasicBlock(LLVM_BB) : nullptr;
   MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
   F->insert(It, loopMBB);
   if (CmpOpcode)
     F->insert(It, loop2MBB);
   F->insert(It, exitMBB);
   exitMBB->splice(exitMBB->begin(), BB,
                   std::next(MachineBasicBlock::iterator(MI)), BB->end());
   exitMBB->transferSuccessorsAndUpdatePHIs(BB);
 
   MachineRegisterInfo &RegInfo = F->getRegInfo();
   const TargetRegisterClass *RC =
       is64bit ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
   const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
 
   Register PtrReg = RegInfo.createVirtualRegister(RC);
   Register Shift1Reg = RegInfo.createVirtualRegister(GPRC);
   Register ShiftReg =
       isLittleEndian ? Shift1Reg : RegInfo.createVirtualRegister(GPRC);
   Register Incr2Reg = RegInfo.createVirtualRegister(GPRC);
   Register MaskReg = RegInfo.createVirtualRegister(GPRC);
   Register Mask2Reg = RegInfo.createVirtualRegister(GPRC);
   Register Mask3Reg = RegInfo.createVirtualRegister(GPRC);
   Register Tmp2Reg = RegInfo.createVirtualRegister(GPRC);
   Register Tmp3Reg = RegInfo.createVirtualRegister(GPRC);
   Register Tmp4Reg = RegInfo.createVirtualRegister(GPRC);
   Register TmpDestReg = RegInfo.createVirtualRegister(GPRC);
   Register Ptr1Reg;
   Register TmpReg =
       (!BinOpcode) ? Incr2Reg : RegInfo.createVirtualRegister(GPRC);
 
   //  thisMBB:
   //   ...
   //   fallthrough --> loopMBB
   BB->addSuccessor(loopMBB);
 
   // The 4-byte load must be aligned, while a char or short may be
   // anywhere in the word.  Hence all this nasty bookkeeping code.
   //   add ptr1, ptrA, ptrB [copy if ptrA==0]
   //   rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
   //   xori shift, shift1, 24 [16]
   //   rlwinm ptr, ptr1, 0, 0, 29
   //   slw incr2, incr, shift
   //   li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
   //   slw mask, mask2, shift
   //  loopMBB:
   //   lwarx tmpDest, ptr
   //   add tmp, tmpDest, incr2
   //   andc tmp2, tmpDest, mask
   //   and tmp3, tmp, mask
   //   or tmp4, tmp3, tmp2
   //   stwcx. tmp4, ptr
   //   bne- loopMBB
   //   fallthrough --> exitMBB
   //   srw dest, tmpDest, shift
   if (ptrA != ZeroReg) {
     Ptr1Reg = RegInfo.createVirtualRegister(RC);
     BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
         .addReg(ptrA)
         .addReg(ptrB);
   } else {
     Ptr1Reg = ptrB;
   }
   // We need use 32-bit subregister to avoid mismatch register class in 64-bit
   // mode.
   BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg)
       .addReg(Ptr1Reg, 0, is64bit ? PPC::sub_32 : 0)
       .addImm(3)
       .addImm(27)
       .addImm(is8bit ? 28 : 27);
   if (!isLittleEndian)
     BuildMI(BB, dl, TII->get(PPC::XORI), ShiftReg)
         .addReg(Shift1Reg)
         .addImm(is8bit ? 24 : 16);
   if (is64bit)
     BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
         .addReg(Ptr1Reg)
         .addImm(0)
         .addImm(61);
   else
     BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
         .addReg(Ptr1Reg)
         .addImm(0)
         .addImm(0)
         .addImm(29);
   BuildMI(BB, dl, TII->get(PPC::SLW), Incr2Reg).addReg(incr).addReg(ShiftReg);
   if (is8bit)
     BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
   else {
     BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
     BuildMI(BB, dl, TII->get(PPC::ORI), Mask2Reg)
         .addReg(Mask3Reg)
         .addImm(65535);
   }
   BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
       .addReg(Mask2Reg)
       .addReg(ShiftReg);
 
   BB = loopMBB;
   BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
       .addReg(ZeroReg)
       .addReg(PtrReg);
   if (BinOpcode)
     BuildMI(BB, dl, TII->get(BinOpcode), TmpReg)
         .addReg(Incr2Reg)
         .addReg(TmpDestReg);
   BuildMI(BB, dl, TII->get(PPC::ANDC), Tmp2Reg)
       .addReg(TmpDestReg)
       .addReg(MaskReg);
   BuildMI(BB, dl, TII->get(PPC::AND), Tmp3Reg).addReg(TmpReg).addReg(MaskReg);
   if (CmpOpcode) {
     // For unsigned comparisons, we can directly compare the shifted values.
     // For signed comparisons we shift and sign extend.
     Register SReg = RegInfo.createVirtualRegister(GPRC);
     BuildMI(BB, dl, TII->get(PPC::AND), SReg)
         .addReg(TmpDestReg)
         .addReg(MaskReg);
     unsigned ValueReg = SReg;
     unsigned CmpReg = Incr2Reg;
     if (CmpOpcode == PPC::CMPW) {
       ValueReg = RegInfo.createVirtualRegister(GPRC);
       BuildMI(BB, dl, TII->get(PPC::SRW), ValueReg)
           .addReg(SReg)
           .addReg(ShiftReg);
       Register ValueSReg = RegInfo.createVirtualRegister(GPRC);
       BuildMI(BB, dl, TII->get(is8bit ? PPC::EXTSB : PPC::EXTSH), ValueSReg)
           .addReg(ValueReg);
       ValueReg = ValueSReg;
       CmpReg = incr;
     }
     BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0)
         .addReg(CmpReg)
         .addReg(ValueReg);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(CmpPred)
         .addReg(PPC::CR0)
         .addMBB(exitMBB);
     BB->addSuccessor(loop2MBB);
     BB->addSuccessor(exitMBB);
     BB = loop2MBB;
   }
   BuildMI(BB, dl, TII->get(PPC::OR), Tmp4Reg).addReg(Tmp3Reg).addReg(Tmp2Reg);
   BuildMI(BB, dl, TII->get(PPC::STWCX))
       .addReg(Tmp4Reg)
       .addReg(ZeroReg)
       .addReg(PtrReg);
   BuildMI(BB, dl, TII->get(PPC::BCC))
       .addImm(PPC::PRED_NE)
       .addReg(PPC::CR0)
       .addMBB(loopMBB);
   BB->addSuccessor(loopMBB);
   BB->addSuccessor(exitMBB);
 
   //  exitMBB:
   //   ...
   BB = exitMBB;
   BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW), dest)
       .addReg(TmpDestReg)
       .addReg(ShiftReg);
   return BB;
 }
 
 llvm::MachineBasicBlock *
 PPCTargetLowering::emitEHSjLjSetJmp(MachineInstr &MI,
                                     MachineBasicBlock *MBB) const {
   DebugLoc DL = MI.getDebugLoc();
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
   const PPCRegisterInfo *TRI = Subtarget.getRegisterInfo();
 
   MachineFunction *MF = MBB->getParent();
   MachineRegisterInfo &MRI = MF->getRegInfo();
 
   const BasicBlock *BB = MBB->getBasicBlock();
   MachineFunction::iterator I = ++MBB->getIterator();
 
   Register DstReg = MI.getOperand(0).getReg();
   const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
   assert(TRI->isTypeLegalForClass(*RC, MVT::i32) && "Invalid destination!");
   Register mainDstReg = MRI.createVirtualRegister(RC);
   Register restoreDstReg = MRI.createVirtualRegister(RC);
 
   MVT PVT = getPointerTy(MF->getDataLayout());
   assert((PVT == MVT::i64 || PVT == MVT::i32) &&
          "Invalid Pointer Size!");
   // For v = setjmp(buf), we generate
   //
   // thisMBB:
   //  SjLjSetup mainMBB
   //  bl mainMBB
   //  v_restore = 1
   //  b sinkMBB
   //
   // mainMBB:
   //  buf[LabelOffset] = LR
   //  v_main = 0
   //
   // sinkMBB:
   //  v = phi(main, restore)
   //
 
   MachineBasicBlock *thisMBB = MBB;
   MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
   MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
   MF->insert(I, mainMBB);
   MF->insert(I, sinkMBB);
 
   MachineInstrBuilder MIB;
 
   // Transfer the remainder of BB and its successor edges to sinkMBB.
   sinkMBB->splice(sinkMBB->begin(), MBB,
                   std::next(MachineBasicBlock::iterator(MI)), MBB->end());
   sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
 
   // Note that the structure of the jmp_buf used here is not compatible
   // with that used by libc, and is not designed to be. Specifically, it
   // stores only those 'reserved' registers that LLVM does not otherwise
   // understand how to spill. Also, by convention, by the time this
   // intrinsic is called, Clang has already stored the frame address in the
   // first slot of the buffer and stack address in the third. Following the
   // X86 target code, we'll store the jump address in the second slot. We also
   // need to save the TOC pointer (R2) to handle jumps between shared
   // libraries, and that will be stored in the fourth slot. The thread
   // identifier (R13) is not affected.
 
   // thisMBB:
   const int64_t LabelOffset = 1 * PVT.getStoreSize();
   const int64_t TOCOffset   = 3 * PVT.getStoreSize();
   const int64_t BPOffset    = 4 * PVT.getStoreSize();
 
   // Prepare IP either in reg.
   const TargetRegisterClass *PtrRC = getRegClassFor(PVT);
   Register LabelReg = MRI.createVirtualRegister(PtrRC);
   Register BufReg = MI.getOperand(1).getReg();
 
   if (Subtarget.is64BitELFABI()) {
     setUsesTOCBasePtr(*MBB->getParent());
     MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::STD))
               .addReg(PPC::X2)
               .addImm(TOCOffset)
               .addReg(BufReg)
               .cloneMemRefs(MI);
   }
 
   // Naked functions never have a base pointer, and so we use r1. For all
   // other functions, this decision must be delayed until during PEI.
   unsigned BaseReg;
   if (MF->getFunction().hasFnAttribute(Attribute::Naked))
     BaseReg = Subtarget.isPPC64() ? PPC::X1 : PPC::R1;
   else
     BaseReg = Subtarget.isPPC64() ? PPC::BP8 : PPC::BP;
 
   MIB = BuildMI(*thisMBB, MI, DL,
                 TII->get(Subtarget.isPPC64() ? PPC::STD : PPC::STW))
             .addReg(BaseReg)
             .addImm(BPOffset)
             .addReg(BufReg)
             .cloneMemRefs(MI);
 
   // Setup
   MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::BCLalways)).addMBB(mainMBB);
   MIB.addRegMask(TRI->getNoPreservedMask());
 
   BuildMI(*thisMBB, MI, DL, TII->get(PPC::LI), restoreDstReg).addImm(1);
 
   MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::EH_SjLj_Setup))
           .addMBB(mainMBB);
   MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::B)).addMBB(sinkMBB);
 
   thisMBB->addSuccessor(mainMBB, BranchProbability::getZero());
   thisMBB->addSuccessor(sinkMBB, BranchProbability::getOne());
 
   // mainMBB:
   //  mainDstReg = 0
   MIB =
       BuildMI(mainMBB, DL,
               TII->get(Subtarget.isPPC64() ? PPC::MFLR8 : PPC::MFLR), LabelReg);
 
   // Store IP
   if (Subtarget.isPPC64()) {
     MIB = BuildMI(mainMBB, DL, TII->get(PPC::STD))
             .addReg(LabelReg)
             .addImm(LabelOffset)
             .addReg(BufReg);
   } else {
     MIB = BuildMI(mainMBB, DL, TII->get(PPC::STW))
             .addReg(LabelReg)
             .addImm(LabelOffset)
             .addReg(BufReg);
   }
   MIB.cloneMemRefs(MI);
 
   BuildMI(mainMBB, DL, TII->get(PPC::LI), mainDstReg).addImm(0);
   mainMBB->addSuccessor(sinkMBB);
 
   // sinkMBB:
   BuildMI(*sinkMBB, sinkMBB->begin(), DL,
           TII->get(PPC::PHI), DstReg)
     .addReg(mainDstReg).addMBB(mainMBB)
     .addReg(restoreDstReg).addMBB(thisMBB);
 
   MI.eraseFromParent();
   return sinkMBB;
 }
 
 MachineBasicBlock *
 PPCTargetLowering::emitEHSjLjLongJmp(MachineInstr &MI,
                                      MachineBasicBlock *MBB) const {
   DebugLoc DL = MI.getDebugLoc();
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
 
   MachineFunction *MF = MBB->getParent();
   MachineRegisterInfo &MRI = MF->getRegInfo();
 
   MVT PVT = getPointerTy(MF->getDataLayout());
   assert((PVT == MVT::i64 || PVT == MVT::i32) &&
          "Invalid Pointer Size!");
 
   const TargetRegisterClass *RC =
     (PVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
   Register Tmp = MRI.createVirtualRegister(RC);
   // Since FP is only updated here but NOT referenced, it's treated as GPR.
   unsigned FP  = (PVT == MVT::i64) ? PPC::X31 : PPC::R31;
   unsigned SP  = (PVT == MVT::i64) ? PPC::X1 : PPC::R1;
   unsigned BP =
       (PVT == MVT::i64)
           ? PPC::X30
           : (Subtarget.isSVR4ABI() && isPositionIndependent() ? PPC::R29
                                                               : PPC::R30);
 
   MachineInstrBuilder MIB;
 
   const int64_t LabelOffset = 1 * PVT.getStoreSize();
   const int64_t SPOffset    = 2 * PVT.getStoreSize();
   const int64_t TOCOffset   = 3 * PVT.getStoreSize();
   const int64_t BPOffset    = 4 * PVT.getStoreSize();
 
   Register BufReg = MI.getOperand(0).getReg();
 
   // Reload FP (the jumped-to function may not have had a
   // frame pointer, and if so, then its r31 will be restored
   // as necessary).
   if (PVT == MVT::i64) {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), FP)
             .addImm(0)
             .addReg(BufReg);
   } else {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), FP)
             .addImm(0)
             .addReg(BufReg);
   }
   MIB.cloneMemRefs(MI);
 
   // Reload IP
   if (PVT == MVT::i64) {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), Tmp)
             .addImm(LabelOffset)
             .addReg(BufReg);
   } else {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), Tmp)
             .addImm(LabelOffset)
             .addReg(BufReg);
   }
   MIB.cloneMemRefs(MI);
 
   // Reload SP
   if (PVT == MVT::i64) {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), SP)
             .addImm(SPOffset)
             .addReg(BufReg);
   } else {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), SP)
             .addImm(SPOffset)
             .addReg(BufReg);
   }
   MIB.cloneMemRefs(MI);
 
   // Reload BP
   if (PVT == MVT::i64) {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), BP)
             .addImm(BPOffset)
             .addReg(BufReg);
   } else {
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), BP)
             .addImm(BPOffset)
             .addReg(BufReg);
   }
   MIB.cloneMemRefs(MI);
 
   // Reload TOC
   if (PVT == MVT::i64 && Subtarget.isSVR4ABI()) {
     setUsesTOCBasePtr(*MBB->getParent());
     MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), PPC::X2)
               .addImm(TOCOffset)
               .addReg(BufReg)
               .cloneMemRefs(MI);
   }
 
   // Jump
   BuildMI(*MBB, MI, DL,
           TII->get(PVT == MVT::i64 ? PPC::MTCTR8 : PPC::MTCTR)).addReg(Tmp);
   BuildMI(*MBB, MI, DL, TII->get(PVT == MVT::i64 ? PPC::BCTR8 : PPC::BCTR));
 
   MI.eraseFromParent();
   return MBB;
 }
 
 MachineBasicBlock *
 PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
                                                MachineBasicBlock *BB) const {
   if (MI.getOpcode() == TargetOpcode::STACKMAP ||
       MI.getOpcode() == TargetOpcode::PATCHPOINT) {
     if (Subtarget.is64BitELFABI() &&
         MI.getOpcode() == TargetOpcode::PATCHPOINT) {
       // Call lowering should have added an r2 operand to indicate a dependence
       // on the TOC base pointer value. It can't however, because there is no
       // way to mark the dependence as implicit there, and so the stackmap code
       // will confuse it with a regular operand. Instead, add the dependence
       // here.
       MI.addOperand(MachineOperand::CreateReg(PPC::X2, false, true));
     }
 
     return emitPatchPoint(MI, BB);
   }
 
   if (MI.getOpcode() == PPC::EH_SjLj_SetJmp32 ||
       MI.getOpcode() == PPC::EH_SjLj_SetJmp64) {
     return emitEHSjLjSetJmp(MI, BB);
   } else if (MI.getOpcode() == PPC::EH_SjLj_LongJmp32 ||
              MI.getOpcode() == PPC::EH_SjLj_LongJmp64) {
     return emitEHSjLjLongJmp(MI, BB);
   }
 
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
 
   // To "insert" these instructions we actually have to insert their
   // control-flow patterns.
   const BasicBlock *LLVM_BB = BB->getBasicBlock();
   MachineFunction::iterator It = ++BB->getIterator();
 
   MachineFunction *F = BB->getParent();
 
   if (MI.getOpcode() == PPC::SELECT_CC_I4 ||
       MI.getOpcode() == PPC::SELECT_CC_I8 || MI.getOpcode() == PPC::SELECT_I4 ||
       MI.getOpcode() == PPC::SELECT_I8) {
     SmallVector<MachineOperand, 2> Cond;
     if (MI.getOpcode() == PPC::SELECT_CC_I4 ||
         MI.getOpcode() == PPC::SELECT_CC_I8)
       Cond.push_back(MI.getOperand(4));
     else
       Cond.push_back(MachineOperand::CreateImm(PPC::PRED_BIT_SET));
     Cond.push_back(MI.getOperand(1));
 
     DebugLoc dl = MI.getDebugLoc();
     TII->insertSelect(*BB, MI, dl, MI.getOperand(0).getReg(), Cond,
                       MI.getOperand(2).getReg(), MI.getOperand(3).getReg());
   } else if (MI.getOpcode() == PPC::SELECT_CC_F4 ||
              MI.getOpcode() == PPC::SELECT_CC_F8 ||
              MI.getOpcode() == PPC::SELECT_CC_F16 ||
              MI.getOpcode() == PPC::SELECT_CC_QFRC ||
              MI.getOpcode() == PPC::SELECT_CC_QSRC ||
              MI.getOpcode() == PPC::SELECT_CC_QBRC ||
              MI.getOpcode() == PPC::SELECT_CC_VRRC ||
              MI.getOpcode() == PPC::SELECT_CC_VSFRC ||
              MI.getOpcode() == PPC::SELECT_CC_VSSRC ||
              MI.getOpcode() == PPC::SELECT_CC_VSRC ||
              MI.getOpcode() == PPC::SELECT_CC_SPE4 ||
              MI.getOpcode() == PPC::SELECT_CC_SPE ||
              MI.getOpcode() == PPC::SELECT_F4 ||
              MI.getOpcode() == PPC::SELECT_F8 ||
              MI.getOpcode() == PPC::SELECT_F16 ||
              MI.getOpcode() == PPC::SELECT_QFRC ||
              MI.getOpcode() == PPC::SELECT_QSRC ||
              MI.getOpcode() == PPC::SELECT_QBRC ||
              MI.getOpcode() == PPC::SELECT_SPE ||
              MI.getOpcode() == PPC::SELECT_SPE4 ||
              MI.getOpcode() == PPC::SELECT_VRRC ||
              MI.getOpcode() == PPC::SELECT_VSFRC ||
              MI.getOpcode() == PPC::SELECT_VSSRC ||
              MI.getOpcode() == PPC::SELECT_VSRC) {
     // The incoming instruction knows the destination vreg to set, the
     // condition code register to branch on, the true/false values to
     // select between, and a branch opcode to use.
 
     //  thisMBB:
     //  ...
     //   TrueVal = ...
     //   cmpTY ccX, r1, r2
     //   bCC copy1MBB
     //   fallthrough --> copy0MBB
     MachineBasicBlock *thisMBB = BB;
     MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
     DebugLoc dl = MI.getDebugLoc();
     F->insert(It, copy0MBB);
     F->insert(It, sinkMBB);
 
     // Transfer the remainder of BB and its successor edges to sinkMBB.
     sinkMBB->splice(sinkMBB->begin(), BB,
                     std::next(MachineBasicBlock::iterator(MI)), BB->end());
     sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
 
     // Next, add the true and fallthrough blocks as its successors.
     BB->addSuccessor(copy0MBB);
     BB->addSuccessor(sinkMBB);
 
     if (MI.getOpcode() == PPC::SELECT_I4 || MI.getOpcode() == PPC::SELECT_I8 ||
         MI.getOpcode() == PPC::SELECT_F4 || MI.getOpcode() == PPC::SELECT_F8 ||
         MI.getOpcode() == PPC::SELECT_F16 ||
         MI.getOpcode() == PPC::SELECT_SPE4 ||
         MI.getOpcode() == PPC::SELECT_SPE ||
         MI.getOpcode() == PPC::SELECT_QFRC ||
         MI.getOpcode() == PPC::SELECT_QSRC ||
         MI.getOpcode() == PPC::SELECT_QBRC ||
         MI.getOpcode() == PPC::SELECT_VRRC ||
         MI.getOpcode() == PPC::SELECT_VSFRC ||
         MI.getOpcode() == PPC::SELECT_VSSRC ||
         MI.getOpcode() == PPC::SELECT_VSRC) {
       BuildMI(BB, dl, TII->get(PPC::BC))
           .addReg(MI.getOperand(1).getReg())
           .addMBB(sinkMBB);
     } else {
       unsigned SelectPred = MI.getOperand(4).getImm();
       BuildMI(BB, dl, TII->get(PPC::BCC))
           .addImm(SelectPred)
           .addReg(MI.getOperand(1).getReg())
           .addMBB(sinkMBB);
     }
 
     //  copy0MBB:
     //   %FalseValue = ...
     //   # fallthrough to sinkMBB
     BB = copy0MBB;
 
     // Update machine-CFG edges
     BB->addSuccessor(sinkMBB);
 
     //  sinkMBB:
     //   %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
     //  ...
     BB = sinkMBB;
     BuildMI(*BB, BB->begin(), dl, TII->get(PPC::PHI), MI.getOperand(0).getReg())
         .addReg(MI.getOperand(3).getReg())
         .addMBB(copy0MBB)
         .addReg(MI.getOperand(2).getReg())
         .addMBB(thisMBB);
   } else if (MI.getOpcode() == PPC::ReadTB) {
     // To read the 64-bit time-base register on a 32-bit target, we read the
     // two halves. Should the counter have wrapped while it was being read, we
     // need to try again.
     // ...
     // readLoop:
     // mfspr Rx,TBU # load from TBU
     // mfspr Ry,TB  # load from TB
     // mfspr Rz,TBU # load from TBU
     // cmpw crX,Rx,Rz # check if 'old'='new'
     // bne readLoop   # branch if they're not equal
     // ...
 
     MachineBasicBlock *readMBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
     DebugLoc dl = MI.getDebugLoc();
     F->insert(It, readMBB);
     F->insert(It, sinkMBB);
 
     // Transfer the remainder of BB and its successor edges to sinkMBB.
     sinkMBB->splice(sinkMBB->begin(), BB,
                     std::next(MachineBasicBlock::iterator(MI)), BB->end());
     sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
 
     BB->addSuccessor(readMBB);
     BB = readMBB;
 
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     Register ReadAgainReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
     Register LoReg = MI.getOperand(0).getReg();
     Register HiReg = MI.getOperand(1).getReg();
 
     BuildMI(BB, dl, TII->get(PPC::MFSPR), HiReg).addImm(269);
     BuildMI(BB, dl, TII->get(PPC::MFSPR), LoReg).addImm(268);
     BuildMI(BB, dl, TII->get(PPC::MFSPR), ReadAgainReg).addImm(269);
 
     Register CmpReg = RegInfo.createVirtualRegister(&PPC::CRRCRegClass);
 
     BuildMI(BB, dl, TII->get(PPC::CMPW), CmpReg)
         .addReg(HiReg)
         .addReg(ReadAgainReg);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(PPC::PRED_NE)
         .addReg(CmpReg)
         .addMBB(readMBB);
 
     BB->addSuccessor(readMBB);
     BB->addSuccessor(sinkMBB);
   } else if (MI.getOpcode() == PPC::ATOMIC_LOAD_ADD_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ADD4);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_ADD_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ADD4);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_ADD_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::ADD4);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_ADD_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::ADD8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_AND_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::AND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_AND_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::AND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_AND_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::AND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_AND_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::AND8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_OR_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::OR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_OR_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::OR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_OR_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::OR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_OR_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::OR8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_XOR_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::XOR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_XOR_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::XOR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_XOR_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::XOR);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_XOR_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::XOR8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_NAND_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::NAND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_NAND_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::NAND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_NAND_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::NAND);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_NAND_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::NAND8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_SUB_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::SUBF);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_SUB_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::SUBF);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_SUB_I32)
     BB = EmitAtomicBinary(MI, BB, 4, PPC::SUBF);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_SUB_I64)
     BB = EmitAtomicBinary(MI, BB, 8, PPC::SUBF8);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MIN_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, 0, PPC::CMPW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MIN_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, 0, PPC::CMPW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MIN_I32)
     BB = EmitAtomicBinary(MI, BB, 4, 0, PPC::CMPW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MIN_I64)
     BB = EmitAtomicBinary(MI, BB, 8, 0, PPC::CMPD, PPC::PRED_GE);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MAX_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, 0, PPC::CMPW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MAX_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, 0, PPC::CMPW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MAX_I32)
     BB = EmitAtomicBinary(MI, BB, 4, 0, PPC::CMPW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_MAX_I64)
     BB = EmitAtomicBinary(MI, BB, 8, 0, PPC::CMPD, PPC::PRED_LE);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMIN_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, 0, PPC::CMPLW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMIN_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, 0, PPC::CMPLW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMIN_I32)
     BB = EmitAtomicBinary(MI, BB, 4, 0, PPC::CMPLW, PPC::PRED_GE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMIN_I64)
     BB = EmitAtomicBinary(MI, BB, 8, 0, PPC::CMPLD, PPC::PRED_GE);
 
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMAX_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, 0, PPC::CMPLW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMAX_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, 0, PPC::CMPLW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMAX_I32)
     BB = EmitAtomicBinary(MI, BB, 4, 0, PPC::CMPLW, PPC::PRED_LE);
   else if (MI.getOpcode() == PPC::ATOMIC_LOAD_UMAX_I64)
     BB = EmitAtomicBinary(MI, BB, 8, 0, PPC::CMPLD, PPC::PRED_LE);
 
   else if (MI.getOpcode() == PPC::ATOMIC_SWAP_I8)
     BB = EmitPartwordAtomicBinary(MI, BB, true, 0);
   else if (MI.getOpcode() == PPC::ATOMIC_SWAP_I16)
     BB = EmitPartwordAtomicBinary(MI, BB, false, 0);
   else if (MI.getOpcode() == PPC::ATOMIC_SWAP_I32)
     BB = EmitAtomicBinary(MI, BB, 4, 0);
   else if (MI.getOpcode() == PPC::ATOMIC_SWAP_I64)
     BB = EmitAtomicBinary(MI, BB, 8, 0);
   else if (MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I32 ||
            MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I64 ||
            (Subtarget.hasPartwordAtomics() &&
             MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I8) ||
            (Subtarget.hasPartwordAtomics() &&
             MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I16)) {
     bool is64bit = MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I64;
 
     auto LoadMnemonic = PPC::LDARX;
     auto StoreMnemonic = PPC::STDCX;
     switch (MI.getOpcode()) {
     default:
       llvm_unreachable("Compare and swap of unknown size");
     case PPC::ATOMIC_CMP_SWAP_I8:
       LoadMnemonic = PPC::LBARX;
       StoreMnemonic = PPC::STBCX;
       assert(Subtarget.hasPartwordAtomics() && "No support partword atomics.");
       break;
     case PPC::ATOMIC_CMP_SWAP_I16:
       LoadMnemonic = PPC::LHARX;
       StoreMnemonic = PPC::STHCX;
       assert(Subtarget.hasPartwordAtomics() && "No support partword atomics.");
       break;
     case PPC::ATOMIC_CMP_SWAP_I32:
       LoadMnemonic = PPC::LWARX;
       StoreMnemonic = PPC::STWCX;
       break;
     case PPC::ATOMIC_CMP_SWAP_I64:
       LoadMnemonic = PPC::LDARX;
       StoreMnemonic = PPC::STDCX;
       break;
     }
     Register dest = MI.getOperand(0).getReg();
     Register ptrA = MI.getOperand(1).getReg();
     Register ptrB = MI.getOperand(2).getReg();
     Register oldval = MI.getOperand(3).getReg();
     Register newval = MI.getOperand(4).getReg();
     DebugLoc dl = MI.getDebugLoc();
 
     MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
     F->insert(It, loop1MBB);
     F->insert(It, loop2MBB);
     F->insert(It, midMBB);
     F->insert(It, exitMBB);
     exitMBB->splice(exitMBB->begin(), BB,
                     std::next(MachineBasicBlock::iterator(MI)), BB->end());
     exitMBB->transferSuccessorsAndUpdatePHIs(BB);
 
     //  thisMBB:
     //   ...
     //   fallthrough --> loopMBB
     BB->addSuccessor(loop1MBB);
 
     // loop1MBB:
     //   l[bhwd]arx dest, ptr
     //   cmp[wd] dest, oldval
     //   bne- midMBB
     // loop2MBB:
     //   st[bhwd]cx. newval, ptr
     //   bne- loopMBB
     //   b exitBB
     // midMBB:
     //   st[bhwd]cx. dest, ptr
     // exitBB:
     BB = loop1MBB;
     BuildMI(BB, dl, TII->get(LoadMnemonic), dest).addReg(ptrA).addReg(ptrB);
     BuildMI(BB, dl, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR0)
         .addReg(oldval)
         .addReg(dest);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(PPC::PRED_NE)
         .addReg(PPC::CR0)
         .addMBB(midMBB);
     BB->addSuccessor(loop2MBB);
     BB->addSuccessor(midMBB);
 
     BB = loop2MBB;
     BuildMI(BB, dl, TII->get(StoreMnemonic))
         .addReg(newval)
         .addReg(ptrA)
         .addReg(ptrB);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(PPC::PRED_NE)
         .addReg(PPC::CR0)
         .addMBB(loop1MBB);
     BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
     BB->addSuccessor(loop1MBB);
     BB->addSuccessor(exitMBB);
 
     BB = midMBB;
     BuildMI(BB, dl, TII->get(StoreMnemonic))
         .addReg(dest)
         .addReg(ptrA)
         .addReg(ptrB);
     BB->addSuccessor(exitMBB);
 
     //  exitMBB:
     //   ...
     BB = exitMBB;
   } else if (MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I8 ||
              MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I16) {
     // We must use 64-bit registers for addresses when targeting 64-bit,
     // since we're actually doing arithmetic on them.  Other registers
     // can be 32-bit.
     bool is64bit = Subtarget.isPPC64();
     bool isLittleEndian = Subtarget.isLittleEndian();
     bool is8bit = MI.getOpcode() == PPC::ATOMIC_CMP_SWAP_I8;
 
     Register dest = MI.getOperand(0).getReg();
     Register ptrA = MI.getOperand(1).getReg();
     Register ptrB = MI.getOperand(2).getReg();
     Register oldval = MI.getOperand(3).getReg();
     Register newval = MI.getOperand(4).getReg();
     DebugLoc dl = MI.getDebugLoc();
 
     MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
     F->insert(It, loop1MBB);
     F->insert(It, loop2MBB);
     F->insert(It, midMBB);
     F->insert(It, exitMBB);
     exitMBB->splice(exitMBB->begin(), BB,
                     std::next(MachineBasicBlock::iterator(MI)), BB->end());
     exitMBB->transferSuccessorsAndUpdatePHIs(BB);
 
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     const TargetRegisterClass *RC =
         is64bit ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
     const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
 
     Register PtrReg = RegInfo.createVirtualRegister(RC);
     Register Shift1Reg = RegInfo.createVirtualRegister(GPRC);
     Register ShiftReg =
         isLittleEndian ? Shift1Reg : RegInfo.createVirtualRegister(GPRC);
     Register NewVal2Reg = RegInfo.createVirtualRegister(GPRC);
     Register NewVal3Reg = RegInfo.createVirtualRegister(GPRC);
     Register OldVal2Reg = RegInfo.createVirtualRegister(GPRC);
     Register OldVal3Reg = RegInfo.createVirtualRegister(GPRC);
     Register MaskReg = RegInfo.createVirtualRegister(GPRC);
     Register Mask2Reg = RegInfo.createVirtualRegister(GPRC);
     Register Mask3Reg = RegInfo.createVirtualRegister(GPRC);
     Register Tmp2Reg = RegInfo.createVirtualRegister(GPRC);
     Register Tmp4Reg = RegInfo.createVirtualRegister(GPRC);
     Register TmpDestReg = RegInfo.createVirtualRegister(GPRC);
     Register Ptr1Reg;
     Register TmpReg = RegInfo.createVirtualRegister(GPRC);
     Register ZeroReg = is64bit ? PPC::ZERO8 : PPC::ZERO;
     //  thisMBB:
     //   ...
     //   fallthrough --> loopMBB
     BB->addSuccessor(loop1MBB);
 
     // The 4-byte load must be aligned, while a char or short may be
     // anywhere in the word.  Hence all this nasty bookkeeping code.
     //   add ptr1, ptrA, ptrB [copy if ptrA==0]
     //   rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
     //   xori shift, shift1, 24 [16]
     //   rlwinm ptr, ptr1, 0, 0, 29
     //   slw newval2, newval, shift
     //   slw oldval2, oldval,shift
     //   li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
     //   slw mask, mask2, shift
     //   and newval3, newval2, mask
     //   and oldval3, oldval2, mask
     // loop1MBB:
     //   lwarx tmpDest, ptr
     //   and tmp, tmpDest, mask
     //   cmpw tmp, oldval3
     //   bne- midMBB
     // loop2MBB:
     //   andc tmp2, tmpDest, mask
     //   or tmp4, tmp2, newval3
     //   stwcx. tmp4, ptr
     //   bne- loop1MBB
     //   b exitBB
     // midMBB:
     //   stwcx. tmpDest, ptr
     // exitBB:
     //   srw dest, tmpDest, shift
     if (ptrA != ZeroReg) {
       Ptr1Reg = RegInfo.createVirtualRegister(RC);
       BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
           .addReg(ptrA)
           .addReg(ptrB);
     } else {
       Ptr1Reg = ptrB;
     }
 
     // We need use 32-bit subregister to avoid mismatch register class in 64-bit
     // mode.
     BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg)
         .addReg(Ptr1Reg, 0, is64bit ? PPC::sub_32 : 0)
         .addImm(3)
         .addImm(27)
         .addImm(is8bit ? 28 : 27);
     if (!isLittleEndian)
       BuildMI(BB, dl, TII->get(PPC::XORI), ShiftReg)
           .addReg(Shift1Reg)
           .addImm(is8bit ? 24 : 16);
     if (is64bit)
       BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
           .addReg(Ptr1Reg)
           .addImm(0)
           .addImm(61);
     else
       BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
           .addReg(Ptr1Reg)
           .addImm(0)
           .addImm(0)
           .addImm(29);
     BuildMI(BB, dl, TII->get(PPC::SLW), NewVal2Reg)
         .addReg(newval)
         .addReg(ShiftReg);
     BuildMI(BB, dl, TII->get(PPC::SLW), OldVal2Reg)
         .addReg(oldval)
         .addReg(ShiftReg);
     if (is8bit)
       BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
     else {
       BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
       BuildMI(BB, dl, TII->get(PPC::ORI), Mask2Reg)
           .addReg(Mask3Reg)
           .addImm(65535);
     }
     BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
         .addReg(Mask2Reg)
         .addReg(ShiftReg);
     BuildMI(BB, dl, TII->get(PPC::AND), NewVal3Reg)
         .addReg(NewVal2Reg)
         .addReg(MaskReg);
     BuildMI(BB, dl, TII->get(PPC::AND), OldVal3Reg)
         .addReg(OldVal2Reg)
         .addReg(MaskReg);
 
     BB = loop1MBB;
     BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
         .addReg(ZeroReg)
         .addReg(PtrReg);
     BuildMI(BB, dl, TII->get(PPC::AND), TmpReg)
         .addReg(TmpDestReg)
         .addReg(MaskReg);
     BuildMI(BB, dl, TII->get(PPC::CMPW), PPC::CR0)
         .addReg(TmpReg)
         .addReg(OldVal3Reg);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(PPC::PRED_NE)
         .addReg(PPC::CR0)
         .addMBB(midMBB);
     BB->addSuccessor(loop2MBB);
     BB->addSuccessor(midMBB);
 
     BB = loop2MBB;
     BuildMI(BB, dl, TII->get(PPC::ANDC), Tmp2Reg)
         .addReg(TmpDestReg)
         .addReg(MaskReg);
     BuildMI(BB, dl, TII->get(PPC::OR), Tmp4Reg)
         .addReg(Tmp2Reg)
         .addReg(NewVal3Reg);
     BuildMI(BB, dl, TII->get(PPC::STWCX))
         .addReg(Tmp4Reg)
         .addReg(ZeroReg)
         .addReg(PtrReg);
     BuildMI(BB, dl, TII->get(PPC::BCC))
         .addImm(PPC::PRED_NE)
         .addReg(PPC::CR0)
         .addMBB(loop1MBB);
     BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
     BB->addSuccessor(loop1MBB);
     BB->addSuccessor(exitMBB);
 
     BB = midMBB;
     BuildMI(BB, dl, TII->get(PPC::STWCX))
         .addReg(TmpDestReg)
         .addReg(ZeroReg)
         .addReg(PtrReg);
     BB->addSuccessor(exitMBB);
 
     //  exitMBB:
     //   ...
     BB = exitMBB;
     BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW), dest)
         .addReg(TmpReg)
         .addReg(ShiftReg);
   } else if (MI.getOpcode() == PPC::FADDrtz) {
     // This pseudo performs an FADD with rounding mode temporarily forced
     // to round-to-zero.  We emit this via custom inserter since the FPSCR
     // is not modeled at the SelectionDAG level.
     Register Dest = MI.getOperand(0).getReg();
     Register Src1 = MI.getOperand(1).getReg();
     Register Src2 = MI.getOperand(2).getReg();
     DebugLoc dl = MI.getDebugLoc();
 
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     Register MFFSReg = RegInfo.createVirtualRegister(&PPC::F8RCRegClass);
 
     // Save FPSCR value.
     BuildMI(*BB, MI, dl, TII->get(PPC::MFFS), MFFSReg);
 
     // Set rounding mode to round-to-zero.
     BuildMI(*BB, MI, dl, TII->get(PPC::MTFSB1)).addImm(31);
     BuildMI(*BB, MI, dl, TII->get(PPC::MTFSB0)).addImm(30);
 
     // Perform addition.
     BuildMI(*BB, MI, dl, TII->get(PPC::FADD), Dest).addReg(Src1).addReg(Src2);
 
     // Restore FPSCR value.
     BuildMI(*BB, MI, dl, TII->get(PPC::MTFSFb)).addImm(1).addReg(MFFSReg);
   } else if (MI.getOpcode() == PPC::ANDI_rec_1_EQ_BIT ||
              MI.getOpcode() == PPC::ANDI_rec_1_GT_BIT ||
              MI.getOpcode() == PPC::ANDI_rec_1_EQ_BIT8 ||
              MI.getOpcode() == PPC::ANDI_rec_1_GT_BIT8) {
     unsigned Opcode = (MI.getOpcode() == PPC::ANDI_rec_1_EQ_BIT8 ||
                        MI.getOpcode() == PPC::ANDI_rec_1_GT_BIT8)
                           ? PPC::ANDI8_rec
                           : PPC::ANDI_rec;
     bool IsEQ = (MI.getOpcode() == PPC::ANDI_rec_1_EQ_BIT ||
                  MI.getOpcode() == PPC::ANDI_rec_1_EQ_BIT8);
 
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     Register Dest = RegInfo.createVirtualRegister(
         Opcode == PPC::ANDI_rec ? &PPC::GPRCRegClass : &PPC::G8RCRegClass);
 
     DebugLoc Dl = MI.getDebugLoc();
     BuildMI(*BB, MI, Dl, TII->get(Opcode), Dest)
         .addReg(MI.getOperand(1).getReg())
         .addImm(1);
     BuildMI(*BB, MI, Dl, TII->get(TargetOpcode::COPY),
             MI.getOperand(0).getReg())
         .addReg(IsEQ ? PPC::CR0EQ : PPC::CR0GT);
   } else if (MI.getOpcode() == PPC::TCHECK_RET) {
     DebugLoc Dl = MI.getDebugLoc();
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     Register CRReg = RegInfo.createVirtualRegister(&PPC::CRRCRegClass);
     BuildMI(*BB, MI, Dl, TII->get(PPC::TCHECK), CRReg);
     BuildMI(*BB, MI, Dl, TII->get(TargetOpcode::COPY),
             MI.getOperand(0).getReg())
         .addReg(CRReg);
   } else if (MI.getOpcode() == PPC::TBEGIN_RET) {
     DebugLoc Dl = MI.getDebugLoc();
     unsigned Imm = MI.getOperand(1).getImm();
     BuildMI(*BB, MI, Dl, TII->get(PPC::TBEGIN)).addImm(Imm);
     BuildMI(*BB, MI, Dl, TII->get(TargetOpcode::COPY),
             MI.getOperand(0).getReg())
         .addReg(PPC::CR0EQ);
   } else if (MI.getOpcode() == PPC::SETRNDi) {
     DebugLoc dl = MI.getDebugLoc();
     Register OldFPSCRReg = MI.getOperand(0).getReg();
 
     // Save FPSCR value.
     BuildMI(*BB, MI, dl, TII->get(PPC::MFFS), OldFPSCRReg);
 
     // The floating point rounding mode is in the bits 62:63 of FPCSR, and has
     // the following settings:
     //   00 Round to nearest
     //   01 Round to 0
     //   10 Round to +inf
     //   11 Round to -inf
 
     // When the operand is immediate, using the two least significant bits of
     // the immediate to set the bits 62:63 of FPSCR.
     unsigned Mode = MI.getOperand(1).getImm();
     BuildMI(*BB, MI, dl, TII->get((Mode & 1) ? PPC::MTFSB1 : PPC::MTFSB0))
       .addImm(31);
 
     BuildMI(*BB, MI, dl, TII->get((Mode & 2) ? PPC::MTFSB1 : PPC::MTFSB0))
       .addImm(30);
   } else if (MI.getOpcode() == PPC::SETRND) {
     DebugLoc dl = MI.getDebugLoc();
 
     // Copy register from F8RCRegClass::SrcReg to G8RCRegClass::DestReg
     // or copy register from G8RCRegClass::SrcReg to F8RCRegClass::DestReg.
     // If the target doesn't have DirectMove, we should use stack to do the
     // conversion, because the target doesn't have the instructions like mtvsrd
     // or mfvsrd to do this conversion directly.
     auto copyRegFromG8RCOrF8RC = [&] (unsigned DestReg, unsigned SrcReg) {
       if (Subtarget.hasDirectMove()) {
         BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), DestReg)
           .addReg(SrcReg);
       } else {
         // Use stack to do the register copy.
         unsigned StoreOp = PPC::STD, LoadOp = PPC::LFD;
         MachineRegisterInfo &RegInfo = F->getRegInfo();
         const TargetRegisterClass *RC = RegInfo.getRegClass(SrcReg);
         if (RC == &PPC::F8RCRegClass) {
           // Copy register from F8RCRegClass to G8RCRegclass.
           assert((RegInfo.getRegClass(DestReg) == &PPC::G8RCRegClass) &&
                  "Unsupported RegClass.");
 
           StoreOp = PPC::STFD;
           LoadOp = PPC::LD;
         } else {
           // Copy register from G8RCRegClass to F8RCRegclass.
           assert((RegInfo.getRegClass(SrcReg) == &PPC::G8RCRegClass) &&
                  (RegInfo.getRegClass(DestReg) == &PPC::F8RCRegClass) &&
                  "Unsupported RegClass.");
         }
 
         MachineFrameInfo &MFI = F->getFrameInfo();
         int FrameIdx = MFI.CreateStackObject(8, 8, false);
 
         MachineMemOperand *MMOStore = F->getMachineMemOperand(
           MachinePointerInfo::getFixedStack(*F, FrameIdx, 0),
           MachineMemOperand::MOStore, MFI.getObjectSize(FrameIdx),
           MFI.getObjectAlignment(FrameIdx));
 
         // Store the SrcReg into the stack.
         BuildMI(*BB, MI, dl, TII->get(StoreOp))
           .addReg(SrcReg)
           .addImm(0)
           .addFrameIndex(FrameIdx)
           .addMemOperand(MMOStore);
 
         MachineMemOperand *MMOLoad = F->getMachineMemOperand(
           MachinePointerInfo::getFixedStack(*F, FrameIdx, 0),
           MachineMemOperand::MOLoad, MFI.getObjectSize(FrameIdx),
           MFI.getObjectAlignment(FrameIdx));
 
         // Load from the stack where SrcReg is stored, and save to DestReg,
         // so we have done the RegClass conversion from RegClass::SrcReg to
         // RegClass::DestReg.
         BuildMI(*BB, MI, dl, TII->get(LoadOp), DestReg)
           .addImm(0)
           .addFrameIndex(FrameIdx)
           .addMemOperand(MMOLoad);
       }
     };
 
     Register OldFPSCRReg = MI.getOperand(0).getReg();
 
     // Save FPSCR value.
     BuildMI(*BB, MI, dl, TII->get(PPC::MFFS), OldFPSCRReg);
 
     // When the operand is gprc register, use two least significant bits of the
     // register and mtfsf instruction to set the bits 62:63 of FPSCR.
     //
     // copy OldFPSCRTmpReg, OldFPSCRReg
     // (INSERT_SUBREG ExtSrcReg, (IMPLICIT_DEF ImDefReg), SrcOp, 1)
     // rldimi NewFPSCRTmpReg, ExtSrcReg, OldFPSCRReg, 0, 62
     // copy NewFPSCRReg, NewFPSCRTmpReg
     // mtfsf 255, NewFPSCRReg
     MachineOperand SrcOp = MI.getOperand(1);
     MachineRegisterInfo &RegInfo = F->getRegInfo();
     Register OldFPSCRTmpReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
 
     copyRegFromG8RCOrF8RC(OldFPSCRTmpReg, OldFPSCRReg);
 
     Register ImDefReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
     Register ExtSrcReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
 
     // The first operand of INSERT_SUBREG should be a register which has
     // subregisters, we only care about its RegClass, so we should use an
     // IMPLICIT_DEF register.
     BuildMI(*BB, MI, dl, TII->get(TargetOpcode::IMPLICIT_DEF), ImDefReg);
     BuildMI(*BB, MI, dl, TII->get(PPC::INSERT_SUBREG), ExtSrcReg)
       .addReg(ImDefReg)
       .add(SrcOp)
       .addImm(1);
 
     Register NewFPSCRTmpReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
     BuildMI(*BB, MI, dl, TII->get(PPC::RLDIMI), NewFPSCRTmpReg)
       .addReg(OldFPSCRTmpReg)
       .addReg(ExtSrcReg)
       .addImm(0)
       .addImm(62);
 
     Register NewFPSCRReg = RegInfo.createVirtualRegister(&PPC::F8RCRegClass);
     copyRegFromG8RCOrF8RC(NewFPSCRReg, NewFPSCRTmpReg);
 
     // The mask 255 means that put the 32:63 bits of NewFPSCRReg to the 32:63
     // bits of FPSCR.
     BuildMI(*BB, MI, dl, TII->get(PPC::MTFSF))
       .addImm(255)
       .addReg(NewFPSCRReg)
       .addImm(0)
       .addImm(0);
   } else {
     llvm_unreachable("Unexpected instr type to insert");
   }
 
   MI.eraseFromParent(); // The pseudo instruction is gone now.
   return BB;
 }
 
 //===----------------------------------------------------------------------===//
 // Target Optimization Hooks
 //===----------------------------------------------------------------------===//
 
 static int getEstimateRefinementSteps(EVT VT, const PPCSubtarget &Subtarget) {
   // For the estimates, convergence is quadratic, so we essentially double the
   // number of digits correct after every iteration. For both FRE and FRSQRTE,
   // the minimum architected relative accuracy is 2^-5. When hasRecipPrec(),
   // this is 2^-14. IEEE float has 23 digits and double has 52 digits.
   int RefinementSteps = Subtarget.hasRecipPrec() ? 1 : 3;
   if (VT.getScalarType() == MVT::f64)
     RefinementSteps++;
   return RefinementSteps;
 }
 
 SDValue PPCTargetLowering::getSqrtEstimate(SDValue Operand, SelectionDAG &DAG,
                                            int Enabled, int &RefinementSteps,
                                            bool &UseOneConstNR,
                                            bool Reciprocal) const {
   EVT VT = Operand.getValueType();
   if ((VT == MVT::f32 && Subtarget.hasFRSQRTES()) ||
       (VT == MVT::f64 && Subtarget.hasFRSQRTE()) ||
       (VT == MVT::v4f32 && Subtarget.hasAltivec()) ||
       (VT == MVT::v2f64 && Subtarget.hasVSX()) ||
       (VT == MVT::v4f32 && Subtarget.hasQPX()) ||
       (VT == MVT::v4f64 && Subtarget.hasQPX())) {
     if (RefinementSteps == ReciprocalEstimate::Unspecified)
       RefinementSteps = getEstimateRefinementSteps(VT, Subtarget);
 
     // The Newton-Raphson computation with a single constant does not provide
     // enough accuracy on some CPUs.
     UseOneConstNR = !Subtarget.needsTwoConstNR();
     return DAG.getNode(PPCISD::FRSQRTE, SDLoc(Operand), VT, Operand);
   }
   return SDValue();
 }
 
 SDValue PPCTargetLowering::getRecipEstimate(SDValue Operand, SelectionDAG &DAG,
                                             int Enabled,
                                             int &RefinementSteps) const {
   EVT VT = Operand.getValueType();
   if ((VT == MVT::f32 && Subtarget.hasFRES()) ||
       (VT == MVT::f64 && Subtarget.hasFRE()) ||
       (VT == MVT::v4f32 && Subtarget.hasAltivec()) ||
       (VT == MVT::v2f64 && Subtarget.hasVSX()) ||
       (VT == MVT::v4f32 && Subtarget.hasQPX()) ||
       (VT == MVT::v4f64 && Subtarget.hasQPX())) {
     if (RefinementSteps == ReciprocalEstimate::Unspecified)
       RefinementSteps = getEstimateRefinementSteps(VT, Subtarget);
     return DAG.getNode(PPCISD::FRE, SDLoc(Operand), VT, Operand);
   }
   return SDValue();
 }
 
 unsigned PPCTargetLowering::combineRepeatedFPDivisors() const {
   // Note: This functionality is used only when unsafe-fp-math is enabled, and
   // on cores with reciprocal estimates (which are used when unsafe-fp-math is
   // enabled for division), this functionality is redundant with the default
   // combiner logic (once the division -> reciprocal/multiply transformation
   // has taken place). As a result, this matters more for older cores than for
   // newer ones.
 
   // Combine multiple FDIVs with the same divisor into multiple FMULs by the
   // reciprocal if there are two or more FDIVs (for embedded cores with only
   // one FP pipeline) for three or more FDIVs (for generic OOO cores).
   switch (Subtarget.getCPUDirective()) {
   default:
     return 3;
   case PPC::DIR_440:
   case PPC::DIR_A2:
   case PPC::DIR_E500:
   case PPC::DIR_E500mc:
   case PPC::DIR_E5500:
     return 2;
   }
 }
 
 // isConsecutiveLSLoc needs to work even if all adds have not yet been
 // collapsed, and so we need to look through chains of them.
 static void getBaseWithConstantOffset(SDValue Loc, SDValue &Base,
                                      int64_t& Offset, SelectionDAG &DAG) {
   if (DAG.isBaseWithConstantOffset(Loc)) {
     Base = Loc.getOperand(0);
     Offset += cast<ConstantSDNode>(Loc.getOperand(1))->getSExtValue();
 
     // The base might itself be a base plus an offset, and if so, accumulate
     // that as well.
     getBaseWithConstantOffset(Loc.getOperand(0), Base, Offset, DAG);
   }
 }
 
 static bool isConsecutiveLSLoc(SDValue Loc, EVT VT, LSBaseSDNode *Base,
                             unsigned Bytes, int Dist,
                             SelectionDAG &DAG) {
   if (VT.getSizeInBits() / 8 != Bytes)
     return false;
 
   SDValue BaseLoc = Base->getBasePtr();
   if (Loc.getOpcode() == ISD::FrameIndex) {
     if (BaseLoc.getOpcode() != ISD::FrameIndex)
       return false;
     const MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
     int FI  = cast<FrameIndexSDNode>(Loc)->getIndex();
     int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
     int FS  = MFI.getObjectSize(FI);
     int BFS = MFI.getObjectSize(BFI);
     if (FS != BFS || FS != (int)Bytes) return false;
     return MFI.getObjectOffset(FI) == (MFI.getObjectOffset(BFI) + Dist*Bytes);
   }
 
   SDValue Base1 = Loc, Base2 = BaseLoc;
   int64_t Offset1 = 0, Offset2 = 0;
   getBaseWithConstantOffset(Loc, Base1, Offset1, DAG);
   getBaseWithConstantOffset(BaseLoc, Base2, Offset2, DAG);
   if (Base1 == Base2 && Offset1 == (Offset2 + Dist * Bytes))
     return true;
 
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   const GlobalValue *GV1 = nullptr;
   const GlobalValue *GV2 = nullptr;
   Offset1 = 0;
   Offset2 = 0;
   bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
   bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
   if (isGA1 && isGA2 && GV1 == GV2)
     return Offset1 == (Offset2 + Dist*Bytes);
   return false;
 }
 
 // Like SelectionDAG::isConsecutiveLoad, but also works for stores, and does
 // not enforce equality of the chain operands.
 static bool isConsecutiveLS(SDNode *N, LSBaseSDNode *Base,
                             unsigned Bytes, int Dist,
                             SelectionDAG &DAG) {
   if (LSBaseSDNode *LS = dyn_cast<LSBaseSDNode>(N)) {
     EVT VT = LS->getMemoryVT();
     SDValue Loc = LS->getBasePtr();
     return isConsecutiveLSLoc(Loc, VT, Base, Bytes, Dist, DAG);
   }
 
   if (N->getOpcode() == ISD::INTRINSIC_W_CHAIN) {
     EVT VT;
     switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
     default: return false;
     case Intrinsic::ppc_qpx_qvlfd:
     case Intrinsic::ppc_qpx_qvlfda:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvlfs:
     case Intrinsic::ppc_qpx_qvlfsa:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvlfcd:
     case Intrinsic::ppc_qpx_qvlfcda:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvlfcs:
     case Intrinsic::ppc_qpx_qvlfcsa:
       VT = MVT::v2f32;
       break;
     case Intrinsic::ppc_qpx_qvlfiwa:
     case Intrinsic::ppc_qpx_qvlfiwz:
     case Intrinsic::ppc_altivec_lvx:
     case Intrinsic::ppc_altivec_lvxl:
     case Intrinsic::ppc_vsx_lxvw4x:
     case Intrinsic::ppc_vsx_lxvw4x_be:
       VT = MVT::v4i32;
       break;
     case Intrinsic::ppc_vsx_lxvd2x:
     case Intrinsic::ppc_vsx_lxvd2x_be:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_altivec_lvebx:
       VT = MVT::i8;
       break;
     case Intrinsic::ppc_altivec_lvehx:
       VT = MVT::i16;
       break;
     case Intrinsic::ppc_altivec_lvewx:
       VT = MVT::i32;
       break;
     }
 
     return isConsecutiveLSLoc(N->getOperand(2), VT, Base, Bytes, Dist, DAG);
   }
 
   if (N->getOpcode() == ISD::INTRINSIC_VOID) {
     EVT VT;
     switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
     default: return false;
     case Intrinsic::ppc_qpx_qvstfd:
     case Intrinsic::ppc_qpx_qvstfda:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvstfs:
     case Intrinsic::ppc_qpx_qvstfsa:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvstfcd:
     case Intrinsic::ppc_qpx_qvstfcda:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvstfcs:
     case Intrinsic::ppc_qpx_qvstfcsa:
       VT = MVT::v2f32;
       break;
     case Intrinsic::ppc_qpx_qvstfiw:
     case Intrinsic::ppc_qpx_qvstfiwa:
     case Intrinsic::ppc_altivec_stvx:
     case Intrinsic::ppc_altivec_stvxl:
     case Intrinsic::ppc_vsx_stxvw4x:
       VT = MVT::v4i32;
       break;
     case Intrinsic::ppc_vsx_stxvd2x:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_vsx_stxvw4x_be:
       VT = MVT::v4i32;
       break;
     case Intrinsic::ppc_vsx_stxvd2x_be:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_altivec_stvebx:
       VT = MVT::i8;
       break;
     case Intrinsic::ppc_altivec_stvehx:
       VT = MVT::i16;
       break;
     case Intrinsic::ppc_altivec_stvewx:
       VT = MVT::i32;
       break;
     }
 
     return isConsecutiveLSLoc(N->getOperand(3), VT, Base, Bytes, Dist, DAG);
   }
 
   return false;
 }
 
 // Return true is there is a nearyby consecutive load to the one provided
 // (regardless of alignment). We search up and down the chain, looking though
 // token factors and other loads (but nothing else). As a result, a true result
 // indicates that it is safe to create a new consecutive load adjacent to the
 // load provided.
 static bool findConsecutiveLoad(LoadSDNode *LD, SelectionDAG &DAG) {
   SDValue Chain = LD->getChain();
   EVT VT = LD->getMemoryVT();
 
   SmallSet<SDNode *, 16> LoadRoots;
   SmallVector<SDNode *, 8> Queue(1, Chain.getNode());
   SmallSet<SDNode *, 16> Visited;
 
   // First, search up the chain, branching to follow all token-factor operands.
   // If we find a consecutive load, then we're done, otherwise, record all
   // nodes just above the top-level loads and token factors.
   while (!Queue.empty()) {
     SDNode *ChainNext = Queue.pop_back_val();
     if (!Visited.insert(ChainNext).second)
       continue;
 
     if (MemSDNode *ChainLD = dyn_cast<MemSDNode>(ChainNext)) {
       if (isConsecutiveLS(ChainLD, LD, VT.getStoreSize(), 1, DAG))
         return true;
 
       if (!Visited.count(ChainLD->getChain().getNode()))
         Queue.push_back(ChainLD->getChain().getNode());
     } else if (ChainNext->getOpcode() == ISD::TokenFactor) {
       for (const SDUse &O : ChainNext->ops())
         if (!Visited.count(O.getNode()))
           Queue.push_back(O.getNode());
     } else
       LoadRoots.insert(ChainNext);
   }
 
   // Second, search down the chain, starting from the top-level nodes recorded
   // in the first phase. These top-level nodes are the nodes just above all
   // loads and token factors. Starting with their uses, recursively look though
   // all loads (just the chain uses) and token factors to find a consecutive
   // load.
   Visited.clear();
   Queue.clear();
 
   for (SmallSet<SDNode *, 16>::iterator I = LoadRoots.begin(),
        IE = LoadRoots.end(); I != IE; ++I) {
     Queue.push_back(*I);
 
     while (!Queue.empty()) {
       SDNode *LoadRoot = Queue.pop_back_val();
       if (!Visited.insert(LoadRoot).second)
         continue;
 
       if (MemSDNode *ChainLD = dyn_cast<MemSDNode>(LoadRoot))
         if (isConsecutiveLS(ChainLD, LD, VT.getStoreSize(), 1, DAG))
           return true;
 
       for (SDNode::use_iterator UI = LoadRoot->use_begin(),
            UE = LoadRoot->use_end(); UI != UE; ++UI)
         if (((isa<MemSDNode>(*UI) &&
             cast<MemSDNode>(*UI)->getChain().getNode() == LoadRoot) ||
             UI->getOpcode() == ISD::TokenFactor) && !Visited.count(*UI))
           Queue.push_back(*UI);
     }
   }
 
   return false;
 }
 
 /// This function is called when we have proved that a SETCC node can be replaced
 /// by subtraction (and other supporting instructions) so that the result of
 /// comparison is kept in a GPR instead of CR. This function is purely for
 /// codegen purposes and has some flags to guide the codegen process.
 static SDValue generateEquivalentSub(SDNode *N, int Size, bool Complement,
                                      bool Swap, SDLoc &DL, SelectionDAG &DAG) {
   assert(N->getOpcode() == ISD::SETCC && "ISD::SETCC Expected.");
 
   // Zero extend the operands to the largest legal integer. Originally, they
   // must be of a strictly smaller size.
   auto Op0 = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, N->getOperand(0),
                          DAG.getConstant(Size, DL, MVT::i32));
   auto Op1 = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, N->getOperand(1),
                          DAG.getConstant(Size, DL, MVT::i32));
 
   // Swap if needed. Depends on the condition code.
   if (Swap)
     std::swap(Op0, Op1);
 
   // Subtract extended integers.
   auto SubNode = DAG.getNode(ISD::SUB, DL, MVT::i64, Op0, Op1);
 
   // Move the sign bit to the least significant position and zero out the rest.
   // Now the least significant bit carries the result of original comparison.
   auto Shifted = DAG.getNode(ISD::SRL, DL, MVT::i64, SubNode,
                              DAG.getConstant(Size - 1, DL, MVT::i32));
   auto Final = Shifted;
 
   // Complement the result if needed. Based on the condition code.
   if (Complement)
     Final = DAG.getNode(ISD::XOR, DL, MVT::i64, Shifted,
                         DAG.getConstant(1, DL, MVT::i64));
 
   return DAG.getNode(ISD::TRUNCATE, DL, MVT::i1, Final);
 }
 
 SDValue PPCTargetLowering::ConvertSETCCToSubtract(SDNode *N,
                                                   DAGCombinerInfo &DCI) const {
   assert(N->getOpcode() == ISD::SETCC && "ISD::SETCC Expected.");
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc DL(N);
 
   // Size of integers being compared has a critical role in the following
   // analysis, so we prefer to do this when all types are legal.
   if (!DCI.isAfterLegalizeDAG())
     return SDValue();
 
   // If all users of SETCC extend its value to a legal integer type
   // then we replace SETCC with a subtraction
   for (SDNode::use_iterator UI = N->use_begin(),
        UE = N->use_end(); UI != UE; ++UI) {
     if (UI->getOpcode() != ISD::ZERO_EXTEND)
       return SDValue();
   }
 
   ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
   auto OpSize = N->getOperand(0).getValueSizeInBits();
 
   unsigned Size = DAG.getDataLayout().getLargestLegalIntTypeSizeInBits();
 
   if (OpSize < Size) {
     switch (CC) {
     default: break;
     case ISD::SETULT:
       return generateEquivalentSub(N, Size, false, false, DL, DAG);
     case ISD::SETULE:
       return generateEquivalentSub(N, Size, true, true, DL, DAG);
     case ISD::SETUGT:
       return generateEquivalentSub(N, Size, false, true, DL, DAG);
     case ISD::SETUGE:
       return generateEquivalentSub(N, Size, true, false, DL, DAG);
     }
   }
 
   return SDValue();
 }
 
 SDValue PPCTargetLowering::DAGCombineTruncBoolExt(SDNode *N,
                                                   DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
 
   assert(Subtarget.useCRBits() && "Expecting to be tracking CR bits");
   // If we're tracking CR bits, we need to be careful that we don't have:
   //   trunc(binary-ops(zext(x), zext(y)))
   // or
   //   trunc(binary-ops(binary-ops(zext(x), zext(y)), ...)
   // such that we're unnecessarily moving things into GPRs when it would be
   // better to keep them in CR bits.
 
   // Note that trunc here can be an actual i1 trunc, or can be the effective
   // truncation that comes from a setcc or select_cc.
   if (N->getOpcode() == ISD::TRUNCATE &&
       N->getValueType(0) != MVT::i1)
     return SDValue();
 
   if (N->getOperand(0).getValueType() != MVT::i32 &&
       N->getOperand(0).getValueType() != MVT::i64)
     return SDValue();
 
   if (N->getOpcode() == ISD::SETCC ||
       N->getOpcode() == ISD::SELECT_CC) {
     // If we're looking at a comparison, then we need to make sure that the
     // high bits (all except for the first) don't matter the result.
     ISD::CondCode CC =
       cast<CondCodeSDNode>(N->getOperand(
         N->getOpcode() == ISD::SETCC ? 2 : 4))->get();
     unsigned OpBits = N->getOperand(0).getValueSizeInBits();
 
     if (ISD::isSignedIntSetCC(CC)) {
       if (DAG.ComputeNumSignBits(N->getOperand(0)) != OpBits ||
           DAG.ComputeNumSignBits(N->getOperand(1)) != OpBits)
         return SDValue();
     } else if (ISD::isUnsignedIntSetCC(CC)) {
       if (!DAG.MaskedValueIsZero(N->getOperand(0),
                                  APInt::getHighBitsSet(OpBits, OpBits-1)) ||
           !DAG.MaskedValueIsZero(N->getOperand(1),
                                  APInt::getHighBitsSet(OpBits, OpBits-1)))
         return (N->getOpcode() == ISD::SETCC ? ConvertSETCCToSubtract(N, DCI)
                                              : SDValue());
     } else {
       // This is neither a signed nor an unsigned comparison, just make sure
       // that the high bits are equal.
       KnownBits Op1Known = DAG.computeKnownBits(N->getOperand(0));
       KnownBits Op2Known = DAG.computeKnownBits(N->getOperand(1));
 
       // We don't really care about what is known about the first bit (if
       // anything), so clear it in all masks prior to comparing them.
       Op1Known.Zero.clearBit(0); Op1Known.One.clearBit(0);
       Op2Known.Zero.clearBit(0); Op2Known.One.clearBit(0);
 
       if (Op1Known.Zero != Op2Known.Zero || Op1Known.One != Op2Known.One)
         return SDValue();
     }
   }
 
   // We now know that the higher-order bits are irrelevant, we just need to
   // make sure that all of the intermediate operations are bit operations, and
   // all inputs are extensions.
   if (N->getOperand(0).getOpcode() != ISD::AND &&
       N->getOperand(0).getOpcode() != ISD::OR  &&
       N->getOperand(0).getOpcode() != ISD::XOR &&
       N->getOperand(0).getOpcode() != ISD::SELECT &&
       N->getOperand(0).getOpcode() != ISD::SELECT_CC &&
       N->getOperand(0).getOpcode() != ISD::TRUNCATE &&
       N->getOperand(0).getOpcode() != ISD::SIGN_EXTEND &&
       N->getOperand(0).getOpcode() != ISD::ZERO_EXTEND &&
       N->getOperand(0).getOpcode() != ISD::ANY_EXTEND)
     return SDValue();
 
   if ((N->getOpcode() == ISD::SETCC || N->getOpcode() == ISD::SELECT_CC) &&
       N->getOperand(1).getOpcode() != ISD::AND &&
       N->getOperand(1).getOpcode() != ISD::OR  &&
       N->getOperand(1).getOpcode() != ISD::XOR &&
       N->getOperand(1).getOpcode() != ISD::SELECT &&
       N->getOperand(1).getOpcode() != ISD::SELECT_CC &&
       N->getOperand(1).getOpcode() != ISD::TRUNCATE &&
       N->getOperand(1).getOpcode() != ISD::SIGN_EXTEND &&
       N->getOperand(1).getOpcode() != ISD::ZERO_EXTEND &&
       N->getOperand(1).getOpcode() != ISD::ANY_EXTEND)
     return SDValue();
 
   SmallVector<SDValue, 4> Inputs;
   SmallVector<SDValue, 8> BinOps, PromOps;
   SmallPtrSet<SDNode *, 16> Visited;
 
   for (unsigned i = 0; i < 2; ++i) {
     if (((N->getOperand(i).getOpcode() == ISD::SIGN_EXTEND ||
           N->getOperand(i).getOpcode() == ISD::ZERO_EXTEND ||
           N->getOperand(i).getOpcode() == ISD::ANY_EXTEND) &&
           N->getOperand(i).getOperand(0).getValueType() == MVT::i1) ||
         isa<ConstantSDNode>(N->getOperand(i)))
       Inputs.push_back(N->getOperand(i));
     else
       BinOps.push_back(N->getOperand(i));
 
     if (N->getOpcode() == ISD::TRUNCATE)
       break;
   }
 
   // Visit all inputs, collect all binary operations (and, or, xor and
   // select) that are all fed by extensions.
   while (!BinOps.empty()) {
     SDValue BinOp = BinOps.back();
     BinOps.pop_back();
 
     if (!Visited.insert(BinOp.getNode()).second)
       continue;
 
     PromOps.push_back(BinOp);
 
     for (unsigned i = 0, ie = BinOp.getNumOperands(); i != ie; ++i) {
       // The condition of the select is not promoted.
       if (BinOp.getOpcode() == ISD::SELECT && i == 0)
         continue;
       if (BinOp.getOpcode() == ISD::SELECT_CC && i != 2 && i != 3)
         continue;
 
       if (((BinOp.getOperand(i).getOpcode() == ISD::SIGN_EXTEND ||
             BinOp.getOperand(i).getOpcode() == ISD::ZERO_EXTEND ||
             BinOp.getOperand(i).getOpcode() == ISD::ANY_EXTEND) &&
            BinOp.getOperand(i).getOperand(0).getValueType() == MVT::i1) ||
           isa<ConstantSDNode>(BinOp.getOperand(i))) {
         Inputs.push_back(BinOp.getOperand(i));
       } else if (BinOp.getOperand(i).getOpcode() == ISD::AND ||
                  BinOp.getOperand(i).getOpcode() == ISD::OR  ||
                  BinOp.getOperand(i).getOpcode() == ISD::XOR ||
                  BinOp.getOperand(i).getOpcode() == ISD::SELECT ||
                  BinOp.getOperand(i).getOpcode() == ISD::SELECT_CC ||
                  BinOp.getOperand(i).getOpcode() == ISD::TRUNCATE ||
                  BinOp.getOperand(i).getOpcode() == ISD::SIGN_EXTEND ||
                  BinOp.getOperand(i).getOpcode() == ISD::ZERO_EXTEND ||
                  BinOp.getOperand(i).getOpcode() == ISD::ANY_EXTEND) {
         BinOps.push_back(BinOp.getOperand(i));
       } else {
         // We have an input that is not an extension or another binary
         // operation; we'll abort this transformation.
         return SDValue();
       }
     }
   }
 
   // Make sure that this is a self-contained cluster of operations (which
   // is not quite the same thing as saying that everything has only one
   // use).
   for (unsigned i = 0, ie = Inputs.size(); i != ie; ++i) {
     if (isa<ConstantSDNode>(Inputs[i]))
       continue;
 
     for (SDNode::use_iterator UI = Inputs[i].getNode()->use_begin(),
                               UE = Inputs[i].getNode()->use_end();
          UI != UE; ++UI) {
       SDNode *User = *UI;
       if (User != N && !Visited.count(User))
         return SDValue();
 
       // Make sure that we're not going to promote the non-output-value
       // operand(s) or SELECT or SELECT_CC.
       // FIXME: Although we could sometimes handle this, and it does occur in
       // practice that one of the condition inputs to the select is also one of
       // the outputs, we currently can't deal with this.
       if (User->getOpcode() == ISD::SELECT) {
         if (User->getOperand(0) == Inputs[i])
           return SDValue();
       } else if (User->getOpcode() == ISD::SELECT_CC) {
         if (User->getOperand(0) == Inputs[i] ||
             User->getOperand(1) == Inputs[i])
           return SDValue();
       }
     }
   }
 
   for (unsigned i = 0, ie = PromOps.size(); i != ie; ++i) {
     for (SDNode::use_iterator UI = PromOps[i].getNode()->use_begin(),
                               UE = PromOps[i].getNode()->use_end();
          UI != UE; ++UI) {
       SDNode *User = *UI;
       if (User != N && !Visited.count(User))
         return SDValue();
 
       // Make sure that we're not going to promote the non-output-value
       // operand(s) or SELECT or SELECT_CC.
       // FIXME: Although we could sometimes handle this, and it does occur in
       // practice that one of the condition inputs to the select is also one of
       // the outputs, we currently can't deal with this.
       if (User->getOpcode() == ISD::SELECT) {
         if (User->getOperand(0) == PromOps[i])
           return SDValue();
       } else if (User->getOpcode() == ISD::SELECT_CC) {
         if (User->getOperand(0) == PromOps[i] ||
             User->getOperand(1) == PromOps[i])
           return SDValue();
       }
     }
   }
 
   // Replace all inputs with the extension operand.
   for (unsigned i = 0, ie = Inputs.size(); i != ie; ++i) {
     // Constants may have users outside the cluster of to-be-promoted nodes,
     // and so we need to replace those as we do the promotions.
     if (isa<ConstantSDNode>(Inputs[i]))
       continue;
     else
       DAG.ReplaceAllUsesOfValueWith(Inputs[i], Inputs[i].getOperand(0));
   }
 
   std::list<HandleSDNode> PromOpHandles;
   for (auto &PromOp : PromOps)
     PromOpHandles.emplace_back(PromOp);
 
   // Replace all operations (these are all the same, but have a different
   // (i1) return type). DAG.getNode will validate that the types of
   // a binary operator match, so go through the list in reverse so that
   // we've likely promoted both operands first. Any intermediate truncations or
   // extensions disappear.
   while (!PromOpHandles.empty()) {
     SDValue PromOp = PromOpHandles.back().getValue();
     PromOpHandles.pop_back();
 
     if (PromOp.getOpcode() == ISD::TRUNCATE ||
         PromOp.getOpcode() == ISD::SIGN_EXTEND ||
         PromOp.getOpcode() == ISD::ZERO_EXTEND ||
         PromOp.getOpcode() == ISD::ANY_EXTEND) {
       if (!isa<ConstantSDNode>(PromOp.getOperand(0)) &&
           PromOp.getOperand(0).getValueType() != MVT::i1) {
         // The operand is not yet ready (see comment below).
         PromOpHandles.emplace_front(PromOp);
         continue;
       }
 
       SDValue RepValue = PromOp.getOperand(0);
       if (isa<ConstantSDNode>(RepValue))
         RepValue = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, RepValue);
 
       DAG.ReplaceAllUsesOfValueWith(PromOp, RepValue);
       continue;
     }
 
     unsigned C;
     switch (PromOp.getOpcode()) {
     default:             C = 0; break;
     case ISD::SELECT:    C = 1; break;
     case ISD::SELECT_CC: C = 2; break;
     }
 
     if ((!isa<ConstantSDNode>(PromOp.getOperand(C)) &&
          PromOp.getOperand(C).getValueType() != MVT::i1) ||
         (!isa<ConstantSDNode>(PromOp.getOperand(C+1)) &&
          PromOp.getOperand(C+1).getValueType() != MVT::i1)) {
       // The to-be-promoted operands of this node have not yet been
       // promoted (this should be rare because we're going through the
       // list backward, but if one of the operands has several users in
       // this cluster of to-be-promoted nodes, it is possible).
       PromOpHandles.emplace_front(PromOp);
       continue;
     }
 
     SmallVector<SDValue, 3> Ops(PromOp.getNode()->op_begin(),
                                 PromOp.getNode()->op_end());
 
     // If there are any constant inputs, make sure they're replaced now.
     for (unsigned i = 0; i < 2; ++i)
       if (isa<ConstantSDNode>(Ops[C+i]))
         Ops[C+i] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, Ops[C+i]);
 
     DAG.ReplaceAllUsesOfValueWith(PromOp,
       DAG.getNode(PromOp.getOpcode(), dl, MVT::i1, Ops));
   }
 
   // Now we're left with the initial truncation itself.
   if (N->getOpcode() == ISD::TRUNCATE)
     return N->getOperand(0);
 
   // Otherwise, this is a comparison. The operands to be compared have just
   // changed type (to i1), but everything else is the same.
   return SDValue(N, 0);
 }
 
 SDValue PPCTargetLowering::DAGCombineExtBoolTrunc(SDNode *N,
                                                   DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
 
   // If we're tracking CR bits, we need to be careful that we don't have:
   //   zext(binary-ops(trunc(x), trunc(y)))
   // or
   //   zext(binary-ops(binary-ops(trunc(x), trunc(y)), ...)
   // such that we're unnecessarily moving things into CR bits that can more
   // efficiently stay in GPRs. Note that if we're not certain that the high
   // bits are set as required by the final extension, we still may need to do
   // some masking to get the proper behavior.
 
   // This same functionality is important on PPC64 when dealing with
   // 32-to-64-bit extensions; these occur often when 32-bit values are used as
   // the return values of functions. Because it is so similar, it is handled
   // here as well.
 
   if (N->getValueType(0) != MVT::i32 &&
       N->getValueType(0) != MVT::i64)
     return SDValue();
 
   if (!((N->getOperand(0).getValueType() == MVT::i1 && Subtarget.useCRBits()) ||
         (N->getOperand(0).getValueType() == MVT::i32 && Subtarget.isPPC64())))
     return SDValue();
 
   if (N->getOperand(0).getOpcode() != ISD::AND &&
       N->getOperand(0).getOpcode() != ISD::OR  &&
       N->getOperand(0).getOpcode() != ISD::XOR &&
       N->getOperand(0).getOpcode() != ISD::SELECT &&
       N->getOperand(0).getOpcode() != ISD::SELECT_CC)
     return SDValue();
 
   SmallVector<SDValue, 4> Inputs;
   SmallVector<SDValue, 8> BinOps(1, N->getOperand(0)), PromOps;
   SmallPtrSet<SDNode *, 16> Visited;
 
   // Visit all inputs, collect all binary operations (and, or, xor and
   // select) that are all fed by truncations.
   while (!BinOps.empty()) {
     SDValue BinOp = BinOps.back();
     BinOps.pop_back();
 
     if (!Visited.insert(BinOp.getNode()).second)
       continue;
 
     PromOps.push_back(BinOp);
 
     for (unsigned i = 0, ie = BinOp.getNumOperands(); i != ie; ++i) {
       // The condition of the select is not promoted.
       if (BinOp.getOpcode() == ISD::SELECT && i == 0)
         continue;
       if (BinOp.getOpcode() == ISD::SELECT_CC && i != 2 && i != 3)
         continue;
 
       if (BinOp.getOperand(i).getOpcode() == ISD::TRUNCATE ||
           isa<ConstantSDNode>(BinOp.getOperand(i))) {
         Inputs.push_back(BinOp.getOperand(i));
       } else if (BinOp.getOperand(i).getOpcode() == ISD::AND ||
                  BinOp.getOperand(i).getOpcode() == ISD::OR  ||
                  BinOp.getOperand(i).getOpcode() == ISD::XOR ||
                  BinOp.getOperand(i).getOpcode() == ISD::SELECT ||
                  BinOp.getOperand(i).getOpcode() == ISD::SELECT_CC) {
         BinOps.push_back(BinOp.getOperand(i));
       } else {
         // We have an input that is not a truncation or another binary
         // operation; we'll abort this transformation.
         return SDValue();
       }
     }
   }
 
   // The operands of a select that must be truncated when the select is
   // promoted because the operand is actually part of the to-be-promoted set.
   DenseMap<SDNode *, EVT> SelectTruncOp[2];
 
   // Make sure that this is a self-contained cluster of operations (which
   // is not quite the same thing as saying that everything has only one
   // use).
   for (unsigned i = 0, ie = Inputs.size(); i != ie; ++i) {
     if (isa<ConstantSDNode>(Inputs[i]))
       continue;
 
     for (SDNode::use_iterator UI = Inputs[i].getNode()->use_begin(),
                               UE = Inputs[i].getNode()->use_end();
          UI != UE; ++UI) {
       SDNode *User = *UI;
       if (User != N && !Visited.count(User))
         return SDValue();
 
       // If we're going to promote the non-output-value operand(s) or SELECT or
       // SELECT_CC, record them for truncation.
       if (User->getOpcode() == ISD::SELECT) {
         if (User->getOperand(0) == Inputs[i])
           SelectTruncOp[0].insert(std::make_pair(User,
                                     User->getOperand(0).getValueType()));
       } else if (User->getOpcode() == ISD::SELECT_CC) {
         if (User->getOperand(0) == Inputs[i])
           SelectTruncOp[0].insert(std::make_pair(User,
                                     User->getOperand(0).getValueType()));
         if (User->getOperand(1) == Inputs[i])
           SelectTruncOp[1].insert(std::make_pair(User,
                                     User->getOperand(1).getValueType()));
       }
     }
   }
 
   for (unsigned i = 0, ie = PromOps.size(); i != ie; ++i) {
     for (SDNode::use_iterator UI = PromOps[i].getNode()->use_begin(),
                               UE = PromOps[i].getNode()->use_end();
          UI != UE; ++UI) {
       SDNode *User = *UI;
       if (User != N && !Visited.count(User))
         return SDValue();
 
       // If we're going to promote the non-output-value operand(s) or SELECT or
       // SELECT_CC, record them for truncation.
       if (User->getOpcode() == ISD::SELECT) {
         if (User->getOperand(0) == PromOps[i])
           SelectTruncOp[0].insert(std::make_pair(User,
                                     User->getOperand(0).getValueType()));
       } else if (User->getOpcode() == ISD::SELECT_CC) {
         if (User->getOperand(0) == PromOps[i])
           SelectTruncOp[0].insert(std::make_pair(User,
                                     User->getOperand(0).getValueType()));
         if (User->getOperand(1) == PromOps[i])
           SelectTruncOp[1].insert(std::make_pair(User,
                                     User->getOperand(1).getValueType()));
       }
     }
   }
 
   unsigned PromBits = N->getOperand(0).getValueSizeInBits();
   bool ReallyNeedsExt = false;
   if (N->getOpcode() != ISD::ANY_EXTEND) {
     // If all of the inputs are not already sign/zero extended, then
     // we'll still need to do that at the end.
     for (unsigned i = 0, ie = Inputs.size(); i != ie; ++i) {
       if (isa<ConstantSDNode>(Inputs[i]))
         continue;
 
       unsigned OpBits =
         Inputs[i].getOperand(0).getValueSizeInBits();
       assert(PromBits < OpBits && "Truncation not to a smaller bit count?");
 
       if ((N->getOpcode() == ISD::ZERO_EXTEND &&
            !DAG.MaskedValueIsZero(Inputs[i].getOperand(0),
                                   APInt::getHighBitsSet(OpBits,
                                                         OpBits-PromBits))) ||
           (N->getOpcode() == ISD::SIGN_EXTEND &&
            DAG.ComputeNumSignBits(Inputs[i].getOperand(0)) <
              (OpBits-(PromBits-1)))) {
         ReallyNeedsExt = true;
         break;
       }
     }
   }
 
   // Replace all inputs, either with the truncation operand, or a
   // truncation or extension to the final output type.
   for (unsigned i = 0, ie = Inputs.size(); i != ie; ++i) {
     // Constant inputs need to be replaced with the to-be-promoted nodes that
     // use them because they might have users outside of the cluster of
     // promoted nodes.
     if (isa<ConstantSDNode>(Inputs[i]))
       continue;
 
     SDValue InSrc = Inputs[i].getOperand(0);
     if (Inputs[i].getValueType() == N->getValueType(0))
       DAG.ReplaceAllUsesOfValueWith(Inputs[i], InSrc);
     else if (N->getOpcode() == ISD::SIGN_EXTEND)
       DAG.ReplaceAllUsesOfValueWith(Inputs[i],
         DAG.getSExtOrTrunc(InSrc, dl, N->getValueType(0)));
     else if (N->getOpcode() == ISD::ZERO_EXTEND)
       DAG.ReplaceAllUsesOfValueWith(Inputs[i],
         DAG.getZExtOrTrunc(InSrc, dl, N->getValueType(0)));
     else
       DAG.ReplaceAllUsesOfValueWith(Inputs[i],
         DAG.getAnyExtOrTrunc(InSrc, dl, N->getValueType(0)));
   }
 
   std::list<HandleSDNode> PromOpHandles;
   for (auto &PromOp : PromOps)
     PromOpHandles.emplace_back(PromOp);
 
   // Replace all operations (these are all the same, but have a different
   // (promoted) return type). DAG.getNode will validate that the types of
   // a binary operator match, so go through the list in reverse so that
   // we've likely promoted both operands first.
   while (!PromOpHandles.empty()) {
     SDValue PromOp = PromOpHandles.back().getValue();
     PromOpHandles.pop_back();
 
     unsigned C;
     switch (PromOp.getOpcode()) {
     default:             C = 0; break;
     case ISD::SELECT:    C = 1; break;
     case ISD::SELECT_CC: C = 2; break;
     }
 
     if ((!isa<ConstantSDNode>(PromOp.getOperand(C)) &&
          PromOp.getOperand(C).getValueType() != N->getValueType(0)) ||
         (!isa<ConstantSDNode>(PromOp.getOperand(C+1)) &&
          PromOp.getOperand(C+1).getValueType() != N->getValueType(0))) {
       // The to-be-promoted operands of this node have not yet been
       // promoted (this should be rare because we're going through the
       // list backward, but if one of the operands has several users in
       // this cluster of to-be-promoted nodes, it is possible).
       PromOpHandles.emplace_front(PromOp);
       continue;
     }
 
     // For SELECT and SELECT_CC nodes, we do a similar check for any
     // to-be-promoted comparison inputs.
     if (PromOp.getOpcode() == ISD::SELECT ||
         PromOp.getOpcode() == ISD::SELECT_CC) {
       if ((SelectTruncOp[0].count(PromOp.getNode()) &&
            PromOp.getOperand(0).getValueType() != N->getValueType(0)) ||
           (SelectTruncOp[1].count(PromOp.getNode()) &&
            PromOp.getOperand(1).getValueType() != N->getValueType(0))) {
         PromOpHandles.emplace_front(PromOp);
         continue;
       }
     }
 
     SmallVector<SDValue, 3> Ops(PromOp.getNode()->op_begin(),
                                 PromOp.getNode()->op_end());
 
     // If this node has constant inputs, then they'll need to be promoted here.
     for (unsigned i = 0; i < 2; ++i) {
       if (!isa<ConstantSDNode>(Ops[C+i]))
         continue;
       if (Ops[C+i].getValueType() == N->getValueType(0))
         continue;
 
       if (N->getOpcode() == ISD::SIGN_EXTEND)
         Ops[C+i] = DAG.getSExtOrTrunc(Ops[C+i], dl, N->getValueType(0));
       else if (N->getOpcode() == ISD::ZERO_EXTEND)
         Ops[C+i] = DAG.getZExtOrTrunc(Ops[C+i], dl, N->getValueType(0));
       else
         Ops[C+i] = DAG.getAnyExtOrTrunc(Ops[C+i], dl, N->getValueType(0));
     }
 
     // If we've promoted the comparison inputs of a SELECT or SELECT_CC,
     // truncate them again to the original value type.
     if (PromOp.getOpcode() == ISD::SELECT ||
         PromOp.getOpcode() == ISD::SELECT_CC) {
       auto SI0 = SelectTruncOp[0].find(PromOp.getNode());
       if (SI0 != SelectTruncOp[0].end())
         Ops[0] = DAG.getNode(ISD::TRUNCATE, dl, SI0->second, Ops[0]);
       auto SI1 = SelectTruncOp[1].find(PromOp.getNode());
       if (SI1 != SelectTruncOp[1].end())
         Ops[1] = DAG.getNode(ISD::TRUNCATE, dl, SI1->second, Ops[1]);
     }
 
     DAG.ReplaceAllUsesOfValueWith(PromOp,
       DAG.getNode(PromOp.getOpcode(), dl, N->getValueType(0), Ops));
   }
 
   // Now we're left with the initial extension itself.
   if (!ReallyNeedsExt)
     return N->getOperand(0);
 
   // To zero extend, just mask off everything except for the first bit (in the
   // i1 case).
   if (N->getOpcode() == ISD::ZERO_EXTEND)
     return DAG.getNode(ISD::AND, dl, N->getValueType(0), N->getOperand(0),
                        DAG.getConstant(APInt::getLowBitsSet(
                                          N->getValueSizeInBits(0), PromBits),
                                        dl, N->getValueType(0)));
 
   assert(N->getOpcode() == ISD::SIGN_EXTEND &&
          "Invalid extension type");
   EVT ShiftAmountTy = getShiftAmountTy(N->getValueType(0), DAG.getDataLayout());
   SDValue ShiftCst =
       DAG.getConstant(N->getValueSizeInBits(0) - PromBits, dl, ShiftAmountTy);
   return DAG.getNode(
       ISD::SRA, dl, N->getValueType(0),
       DAG.getNode(ISD::SHL, dl, N->getValueType(0), N->getOperand(0), ShiftCst),
       ShiftCst);
 }
 
 SDValue PPCTargetLowering::combineSetCC(SDNode *N,
                                         DAGCombinerInfo &DCI) const {
   assert(N->getOpcode() == ISD::SETCC &&
          "Should be called with a SETCC node");
 
   ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
   if (CC == ISD::SETNE || CC == ISD::SETEQ) {
     SDValue LHS = N->getOperand(0);
     SDValue RHS = N->getOperand(1);
 
     // If there is a '0 - y' pattern, canonicalize the pattern to the RHS.
     if (LHS.getOpcode() == ISD::SUB && isNullConstant(LHS.getOperand(0)) &&
         LHS.hasOneUse())
       std::swap(LHS, RHS);
 
     // x == 0-y --> x+y == 0
     // x != 0-y --> x+y != 0
     if (RHS.getOpcode() == ISD::SUB && isNullConstant(RHS.getOperand(0)) &&
         RHS.hasOneUse()) {
       SDLoc DL(N);
       SelectionDAG &DAG = DCI.DAG;
       EVT VT = N->getValueType(0);
       EVT OpVT = LHS.getValueType();
       SDValue Add = DAG.getNode(ISD::ADD, DL, OpVT, LHS, RHS.getOperand(1));
       return DAG.getSetCC(DL, VT, Add, DAG.getConstant(0, DL, OpVT), CC);
     }
   }
 
   return DAGCombineTruncBoolExt(N, DCI);
 }
 
 // Is this an extending load from an f32 to an f64?
 static bool isFPExtLoad(SDValue Op) {
   if (LoadSDNode *LD = dyn_cast<LoadSDNode>(Op.getNode()))
     return LD->getExtensionType() == ISD::EXTLOAD &&
       Op.getValueType() == MVT::f64;
   return false;
 }
 
 /// Reduces the number of fp-to-int conversion when building a vector.
 ///
 /// If this vector is built out of floating to integer conversions,
 /// transform it to a vector built out of floating point values followed by a
 /// single floating to integer conversion of the vector.
 /// Namely  (build_vector (fptosi $A), (fptosi $B), ...)
 /// becomes (fptosi (build_vector ($A, $B, ...)))
 SDValue PPCTargetLowering::
 combineElementTruncationToVectorTruncation(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
   assert(N->getOpcode() == ISD::BUILD_VECTOR &&
          "Should be called with a BUILD_VECTOR node");
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
 
   SDValue FirstInput = N->getOperand(0);
   assert(FirstInput.getOpcode() == PPCISD::MFVSR &&
          "The input operand must be an fp-to-int conversion.");
 
   // This combine happens after legalization so the fp_to_[su]i nodes are
   // already converted to PPCSISD nodes.
   unsigned FirstConversion = FirstInput.getOperand(0).getOpcode();
   if (FirstConversion == PPCISD::FCTIDZ ||
       FirstConversion == PPCISD::FCTIDUZ ||
       FirstConversion == PPCISD::FCTIWZ ||
       FirstConversion == PPCISD::FCTIWUZ) {
     bool IsSplat = true;
     bool Is32Bit = FirstConversion == PPCISD::FCTIWZ ||
       FirstConversion == PPCISD::FCTIWUZ;
     EVT SrcVT = FirstInput.getOperand(0).getValueType();
     SmallVector<SDValue, 4> Ops;
     EVT TargetVT = N->getValueType(0);
     for (int i = 0, e = N->getNumOperands(); i < e; ++i) {
       SDValue NextOp = N->getOperand(i);
       if (NextOp.getOpcode() != PPCISD::MFVSR)
         return SDValue();
       unsigned NextConversion = NextOp.getOperand(0).getOpcode();
       if (NextConversion != FirstConversion)
         return SDValue();
       // If we are converting to 32-bit integers, we need to add an FP_ROUND.
       // This is not valid if the input was originally double precision. It is
       // also not profitable to do unless this is an extending load in which
       // case doing this combine will allow us to combine consecutive loads.
       if (Is32Bit && !isFPExtLoad(NextOp.getOperand(0).getOperand(0)))
         return SDValue();
       if (N->getOperand(i) != FirstInput)
         IsSplat = false;
     }
 
     // If this is a splat, we leave it as-is since there will be only a single
     // fp-to-int conversion followed by a splat of the integer. This is better
     // for 32-bit and smaller ints and neutral for 64-bit ints.
     if (IsSplat)
       return SDValue();
 
     // Now that we know we have the right type of node, get its operands
     for (int i = 0, e = N->getNumOperands(); i < e; ++i) {
       SDValue In = N->getOperand(i).getOperand(0);
       if (Is32Bit) {
         // For 32-bit values, we need to add an FP_ROUND node (if we made it
         // here, we know that all inputs are extending loads so this is safe).
         if (In.isUndef())
           Ops.push_back(DAG.getUNDEF(SrcVT));
         else {
           SDValue Trunc = DAG.getNode(ISD::FP_ROUND, dl,
                                       MVT::f32, In.getOperand(0),
                                       DAG.getIntPtrConstant(1, dl));
           Ops.push_back(Trunc);
         }
       } else
         Ops.push_back(In.isUndef() ? DAG.getUNDEF(SrcVT) : In.getOperand(0));
     }
 
     unsigned Opcode;
     if (FirstConversion == PPCISD::FCTIDZ ||
         FirstConversion == PPCISD::FCTIWZ)
       Opcode = ISD::FP_TO_SINT;
     else
       Opcode = ISD::FP_TO_UINT;
 
     EVT NewVT = TargetVT == MVT::v2i64 ? MVT::v2f64 : MVT::v4f32;
     SDValue BV = DAG.getBuildVector(NewVT, dl, Ops);
     return DAG.getNode(Opcode, dl, TargetVT, BV);
   }
   return SDValue();
 }
 
 /// Reduce the number of loads when building a vector.
 ///
 /// Building a vector out of multiple loads can be converted to a load
 /// of the vector type if the loads are consecutive. If the loads are
 /// consecutive but in descending order, a shuffle is added at the end
 /// to reorder the vector.
 static SDValue combineBVOfConsecutiveLoads(SDNode *N, SelectionDAG &DAG) {
   assert(N->getOpcode() == ISD::BUILD_VECTOR &&
          "Should be called with a BUILD_VECTOR node");
 
   SDLoc dl(N);
 
   // Return early for non byte-sized type, as they can't be consecutive.
   if (!N->getValueType(0).getVectorElementType().isByteSized())
     return SDValue();
 
   bool InputsAreConsecutiveLoads = true;
   bool InputsAreReverseConsecutive = true;
   unsigned ElemSize = N->getValueType(0).getScalarType().getStoreSize();
   SDValue FirstInput = N->getOperand(0);
   bool IsRoundOfExtLoad = false;
 
   if (FirstInput.getOpcode() == ISD::FP_ROUND &&
       FirstInput.getOperand(0).getOpcode() == ISD::LOAD) {
     LoadSDNode *LD = dyn_cast<LoadSDNode>(FirstInput.getOperand(0));
     IsRoundOfExtLoad = LD->getExtensionType() == ISD::EXTLOAD;
   }
   // Not a build vector of (possibly fp_rounded) loads.
   if ((!IsRoundOfExtLoad && FirstInput.getOpcode() != ISD::LOAD) ||
       N->getNumOperands() == 1)
     return SDValue();
 
   for (int i = 1, e = N->getNumOperands(); i < e; ++i) {
     // If any inputs are fp_round(extload), they all must be.
     if (IsRoundOfExtLoad && N->getOperand(i).getOpcode() != ISD::FP_ROUND)
       return SDValue();
 
     SDValue NextInput = IsRoundOfExtLoad ? N->getOperand(i).getOperand(0) :
       N->getOperand(i);
     if (NextInput.getOpcode() != ISD::LOAD)
       return SDValue();
 
     SDValue PreviousInput =
       IsRoundOfExtLoad ? N->getOperand(i-1).getOperand(0) : N->getOperand(i-1);
     LoadSDNode *LD1 = dyn_cast<LoadSDNode>(PreviousInput);
     LoadSDNode *LD2 = dyn_cast<LoadSDNode>(NextInput);
 
     // If any inputs are fp_round(extload), they all must be.
     if (IsRoundOfExtLoad && LD2->getExtensionType() != ISD::EXTLOAD)
       return SDValue();
 
     if (!isConsecutiveLS(LD2, LD1, ElemSize, 1, DAG))
       InputsAreConsecutiveLoads = false;
     if (!isConsecutiveLS(LD1, LD2, ElemSize, 1, DAG))
       InputsAreReverseConsecutive = false;
 
     // Exit early if the loads are neither consecutive nor reverse consecutive.
     if (!InputsAreConsecutiveLoads && !InputsAreReverseConsecutive)
       return SDValue();
   }
 
   assert(!(InputsAreConsecutiveLoads && InputsAreReverseConsecutive) &&
          "The loads cannot be both consecutive and reverse consecutive.");
 
   SDValue FirstLoadOp =
     IsRoundOfExtLoad ? FirstInput.getOperand(0) : FirstInput;
   SDValue LastLoadOp =
     IsRoundOfExtLoad ? N->getOperand(N->getNumOperands()-1).getOperand(0) :
                        N->getOperand(N->getNumOperands()-1);
 
   LoadSDNode *LD1 = dyn_cast<LoadSDNode>(FirstLoadOp);
   LoadSDNode *LDL = dyn_cast<LoadSDNode>(LastLoadOp);
   if (InputsAreConsecutiveLoads) {
     assert(LD1 && "Input needs to be a LoadSDNode.");
     return DAG.getLoad(N->getValueType(0), dl, LD1->getChain(),
                        LD1->getBasePtr(), LD1->getPointerInfo(),
                        LD1->getAlignment());
   }
   if (InputsAreReverseConsecutive) {
     assert(LDL && "Input needs to be a LoadSDNode.");
     SDValue Load = DAG.getLoad(N->getValueType(0), dl, LDL->getChain(),
                                LDL->getBasePtr(), LDL->getPointerInfo(),
                                LDL->getAlignment());
     SmallVector<int, 16> Ops;
     for (int i = N->getNumOperands() - 1; i >= 0; i--)
       Ops.push_back(i);
 
     return DAG.getVectorShuffle(N->getValueType(0), dl, Load,
                                 DAG.getUNDEF(N->getValueType(0)), Ops);
   }
   return SDValue();
 }
 
 // This function adds the required vector_shuffle needed to get
 // the elements of the vector extract in the correct position
 // as specified by the CorrectElems encoding.
 static SDValue addShuffleForVecExtend(SDNode *N, SelectionDAG &DAG,
                                       SDValue Input, uint64_t Elems,
                                       uint64_t CorrectElems) {
   SDLoc dl(N);
 
   unsigned NumElems = Input.getValueType().getVectorNumElements();
   SmallVector<int, 16> ShuffleMask(NumElems, -1);
 
   // Knowing the element indices being extracted from the original
   // vector and the order in which they're being inserted, just put
   // them at element indices required for the instruction.
   for (unsigned i = 0; i < N->getNumOperands(); i++) {
     if (DAG.getDataLayout().isLittleEndian())
       ShuffleMask[CorrectElems & 0xF] = Elems & 0xF;
     else
       ShuffleMask[(CorrectElems & 0xF0) >> 4] = (Elems & 0xF0) >> 4;
     CorrectElems = CorrectElems >> 8;
     Elems = Elems >> 8;
   }
 
   SDValue Shuffle =
       DAG.getVectorShuffle(Input.getValueType(), dl, Input,
                            DAG.getUNDEF(Input.getValueType()), ShuffleMask);
 
   EVT Ty = N->getValueType(0);
   SDValue BV = DAG.getNode(PPCISD::SExtVElems, dl, Ty, Shuffle);
   return BV;
 }
 
 // Look for build vector patterns where input operands come from sign
 // extended vector_extract elements of specific indices. If the correct indices
 // aren't used, add a vector shuffle to fix up the indices and create a new
 // PPCISD:SExtVElems node which selects the vector sign extend instructions
 // during instruction selection.
 static SDValue combineBVOfVecSExt(SDNode *N, SelectionDAG &DAG) {
   // This array encodes the indices that the vector sign extend instructions
   // extract from when extending from one type to another for both BE and LE.
   // The right nibble of each byte corresponds to the LE incides.
   // and the left nibble of each byte corresponds to the BE incides.
   // For example: 0x3074B8FC  byte->word
   // For LE: the allowed indices are: 0x0,0x4,0x8,0xC
   // For BE: the allowed indices are: 0x3,0x7,0xB,0xF
   // For example: 0x000070F8  byte->double word
   // For LE: the allowed indices are: 0x0,0x8
   // For BE: the allowed indices are: 0x7,0xF
   uint64_t TargetElems[] = {
       0x3074B8FC, // b->w
       0x000070F8, // b->d
       0x10325476, // h->w
       0x00003074, // h->d
       0x00001032, // w->d
   };
 
   uint64_t Elems = 0;
   int Index;
   SDValue Input;
 
   auto isSExtOfVecExtract = [&](SDValue Op) -> bool {
     if (!Op)
       return false;
     if (Op.getOpcode() != ISD::SIGN_EXTEND &&
         Op.getOpcode() != ISD::SIGN_EXTEND_INREG)
       return false;
 
     // A SIGN_EXTEND_INREG might be fed by an ANY_EXTEND to produce a value
     // of the right width.
     SDValue Extract = Op.getOperand(0);
     if (Extract.getOpcode() == ISD::ANY_EXTEND)
       Extract = Extract.getOperand(0);
     if (Extract.getOpcode() != ISD::EXTRACT_VECTOR_ELT)
       return false;
 
     ConstantSDNode *ExtOp = dyn_cast<ConstantSDNode>(Extract.getOperand(1));
     if (!ExtOp)
       return false;
 
     Index = ExtOp->getZExtValue();
     if (Input && Input != Extract.getOperand(0))
       return false;
 
     if (!Input)
       Input = Extract.getOperand(0);
 
     Elems = Elems << 8;
     Index = DAG.getDataLayout().isLittleEndian() ? Index : Index << 4;
     Elems |= Index;
 
     return true;
   };
 
   // If the build vector operands aren't sign extended vector extracts,
   // of the same input vector, then return.
   for (unsigned i = 0; i < N->getNumOperands(); i++) {
     if (!isSExtOfVecExtract(N->getOperand(i))) {
       return SDValue();
     }
   }
 
   // If the vector extract indicies are not correct, add the appropriate
   // vector_shuffle.
   int TgtElemArrayIdx;
   int InputSize = Input.getValueType().getScalarSizeInBits();
   int OutputSize = N->getValueType(0).getScalarSizeInBits();
   if (InputSize + OutputSize == 40)
     TgtElemArrayIdx = 0;
   else if (InputSize + OutputSize == 72)
     TgtElemArrayIdx = 1;
   else if (InputSize + OutputSize == 48)
     TgtElemArrayIdx = 2;
   else if (InputSize + OutputSize == 80)
     TgtElemArrayIdx = 3;
   else if (InputSize + OutputSize == 96)
     TgtElemArrayIdx = 4;
   else
     return SDValue();
 
   uint64_t CorrectElems = TargetElems[TgtElemArrayIdx];
   CorrectElems = DAG.getDataLayout().isLittleEndian()
                      ? CorrectElems & 0x0F0F0F0F0F0F0F0F
                      : CorrectElems & 0xF0F0F0F0F0F0F0F0;
   if (Elems != CorrectElems) {
     return addShuffleForVecExtend(N, DAG, Input, Elems, CorrectElems);
   }
 
   // Regular lowering will catch cases where a shuffle is not needed.
   return SDValue();
 }
 
 SDValue PPCTargetLowering::DAGCombineBuildVector(SDNode *N,
                                                  DAGCombinerInfo &DCI) const {
   assert(N->getOpcode() == ISD::BUILD_VECTOR &&
          "Should be called with a BUILD_VECTOR node");
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
 
   if (!Subtarget.hasVSX())
     return SDValue();
 
   // The target independent DAG combiner will leave a build_vector of
   // float-to-int conversions intact. We can generate MUCH better code for
   // a float-to-int conversion of a vector of floats.
   SDValue FirstInput = N->getOperand(0);
   if (FirstInput.getOpcode() == PPCISD::MFVSR) {
     SDValue Reduced = combineElementTruncationToVectorTruncation(N, DCI);
     if (Reduced)
       return Reduced;
   }
 
   // If we're building a vector out of consecutive loads, just load that
   // vector type.
   SDValue Reduced = combineBVOfConsecutiveLoads(N, DAG);
   if (Reduced)
     return Reduced;
 
   // If we're building a vector out of extended elements from another vector
   // we have P9 vector integer extend instructions. The code assumes legal
   // input types (i.e. it can't handle things like v4i16) so do not run before
   // legalization.
   if (Subtarget.hasP9Altivec() && !DCI.isBeforeLegalize()) {
     Reduced = combineBVOfVecSExt(N, DAG);
     if (Reduced)
       return Reduced;
   }
 
 
   if (N->getValueType(0) != MVT::v2f64)
     return SDValue();
 
   // Looking for:
   // (build_vector ([su]int_to_fp (extractelt 0)), [su]int_to_fp (extractelt 1))
   if (FirstInput.getOpcode() != ISD::SINT_TO_FP &&
       FirstInput.getOpcode() != ISD::UINT_TO_FP)
     return SDValue();
   if (N->getOperand(1).getOpcode() != ISD::SINT_TO_FP &&
       N->getOperand(1).getOpcode() != ISD::UINT_TO_FP)
     return SDValue();
   if (FirstInput.getOpcode() != N->getOperand(1).getOpcode())
     return SDValue();
 
   SDValue Ext1 = FirstInput.getOperand(0);
   SDValue Ext2 = N->getOperand(1).getOperand(0);
   if(Ext1.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
      Ext2.getOpcode() != ISD::EXTRACT_VECTOR_ELT)
     return SDValue();
 
   ConstantSDNode *Ext1Op = dyn_cast<ConstantSDNode>(Ext1.getOperand(1));
   ConstantSDNode *Ext2Op = dyn_cast<ConstantSDNode>(Ext2.getOperand(1));
   if (!Ext1Op || !Ext2Op)
     return SDValue();
   if (Ext1.getOperand(0).getValueType() != MVT::v4i32 ||
       Ext1.getOperand(0) != Ext2.getOperand(0))
     return SDValue();
 
   int FirstElem = Ext1Op->getZExtValue();
   int SecondElem = Ext2Op->getZExtValue();
   int SubvecIdx;
   if (FirstElem == 0 && SecondElem == 1)
     SubvecIdx = Subtarget.isLittleEndian() ? 1 : 0;
   else if (FirstElem == 2 && SecondElem == 3)
     SubvecIdx = Subtarget.isLittleEndian() ? 0 : 1;
   else
     return SDValue();
 
   SDValue SrcVec = Ext1.getOperand(0);
   auto NodeType = (N->getOperand(1).getOpcode() == ISD::SINT_TO_FP) ?
     PPCISD::SINT_VEC_TO_FP : PPCISD::UINT_VEC_TO_FP;
   return DAG.getNode(NodeType, dl, MVT::v2f64,
                      SrcVec, DAG.getIntPtrConstant(SubvecIdx, dl));
 }
 
 SDValue PPCTargetLowering::combineFPToIntToFP(SDNode *N,
                                               DAGCombinerInfo &DCI) const {
   assert((N->getOpcode() == ISD::SINT_TO_FP ||
           N->getOpcode() == ISD::UINT_TO_FP) &&
          "Need an int -> FP conversion node here");
 
   if (useSoftFloat() || !Subtarget.has64BitSupport())
     return SDValue();
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   SDValue Op(N, 0);
 
   // Don't handle ppc_fp128 here or conversions that are out-of-range capable
   // from the hardware.
   if (Op.getValueType() != MVT::f32 && Op.getValueType() != MVT::f64)
     return SDValue();
   if (Op.getOperand(0).getValueType().getSimpleVT() <= MVT(MVT::i1) ||
       Op.getOperand(0).getValueType().getSimpleVT() > MVT(MVT::i64))
     return SDValue();
 
   SDValue FirstOperand(Op.getOperand(0));
   bool SubWordLoad = FirstOperand.getOpcode() == ISD::LOAD &&
     (FirstOperand.getValueType() == MVT::i8 ||
      FirstOperand.getValueType() == MVT::i16);
   if (Subtarget.hasP9Vector() && Subtarget.hasP9Altivec() && SubWordLoad) {
     bool Signed = N->getOpcode() == ISD::SINT_TO_FP;
     bool DstDouble = Op.getValueType() == MVT::f64;
     unsigned ConvOp = Signed ?
       (DstDouble ? PPCISD::FCFID  : PPCISD::FCFIDS) :
       (DstDouble ? PPCISD::FCFIDU : PPCISD::FCFIDUS);
     SDValue WidthConst =
       DAG.getIntPtrConstant(FirstOperand.getValueType() == MVT::i8 ? 1 : 2,
                             dl, false);
     LoadSDNode *LDN = cast<LoadSDNode>(FirstOperand.getNode());
     SDValue Ops[] = { LDN->getChain(), LDN->getBasePtr(), WidthConst };
     SDValue Ld = DAG.getMemIntrinsicNode(PPCISD::LXSIZX, dl,
                                          DAG.getVTList(MVT::f64, MVT::Other),
                                          Ops, MVT::i8, LDN->getMemOperand());
 
     // For signed conversion, we need to sign-extend the value in the VSR
     if (Signed) {
       SDValue ExtOps[] = { Ld, WidthConst };
       SDValue Ext = DAG.getNode(PPCISD::VEXTS, dl, MVT::f64, ExtOps);
       return DAG.getNode(ConvOp, dl, DstDouble ? MVT::f64 : MVT::f32, Ext);
     } else
       return DAG.getNode(ConvOp, dl, DstDouble ? MVT::f64 : MVT::f32, Ld);
   }
 
 
   // For i32 intermediate values, unfortunately, the conversion functions
   // leave the upper 32 bits of the value are undefined. Within the set of
   // scalar instructions, we have no method for zero- or sign-extending the
   // value. Thus, we cannot handle i32 intermediate values here.
   if (Op.getOperand(0).getValueType() == MVT::i32)
     return SDValue();
 
   assert((Op.getOpcode() == ISD::SINT_TO_FP || Subtarget.hasFPCVT()) &&
          "UINT_TO_FP is supported only with FPCVT");
 
   // If we have FCFIDS, then use it when converting to single-precision.
   // Otherwise, convert to double-precision and then round.
   unsigned FCFOp = (Subtarget.hasFPCVT() && Op.getValueType() == MVT::f32)
                        ? (Op.getOpcode() == ISD::UINT_TO_FP ? PPCISD::FCFIDUS
                                                             : PPCISD::FCFIDS)
                        : (Op.getOpcode() == ISD::UINT_TO_FP ? PPCISD::FCFIDU
                                                             : PPCISD::FCFID);
   MVT FCFTy = (Subtarget.hasFPCVT() && Op.getValueType() == MVT::f32)
                   ? MVT::f32
                   : MVT::f64;
 
   // If we're converting from a float, to an int, and back to a float again,
   // then we don't need the store/load pair at all.
   if ((Op.getOperand(0).getOpcode() == ISD::FP_TO_UINT &&
        Subtarget.hasFPCVT()) ||
       (Op.getOperand(0).getOpcode() == ISD::FP_TO_SINT)) {
     SDValue Src = Op.getOperand(0).getOperand(0);
     if (Src.getValueType() == MVT::f32) {
       Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
       DCI.AddToWorklist(Src.getNode());
     } else if (Src.getValueType() != MVT::f64) {
       // Make sure that we don't pick up a ppc_fp128 source value.
       return SDValue();
     }
 
     unsigned FCTOp =
       Op.getOperand(0).getOpcode() == ISD::FP_TO_SINT ? PPCISD::FCTIDZ :
                                                         PPCISD::FCTIDUZ;
 
     SDValue Tmp = DAG.getNode(FCTOp, dl, MVT::f64, Src);
     SDValue FP = DAG.getNode(FCFOp, dl, FCFTy, Tmp);
 
     if (Op.getValueType() == MVT::f32 && !Subtarget.hasFPCVT()) {
       FP = DAG.getNode(ISD::FP_ROUND, dl,
                        MVT::f32, FP, DAG.getIntPtrConstant(0, dl));
       DCI.AddToWorklist(FP.getNode());
     }
 
     return FP;
   }
 
   return SDValue();
 }
 
 // expandVSXLoadForLE - Convert VSX loads (which may be intrinsics for
 // builtins) into loads with swaps.
 SDValue PPCTargetLowering::expandVSXLoadForLE(SDNode *N,
                                               DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   SDValue Chain;
   SDValue Base;
   MachineMemOperand *MMO;
 
   switch (N->getOpcode()) {
   default:
     llvm_unreachable("Unexpected opcode for little endian VSX load");
   case ISD::LOAD: {
     LoadSDNode *LD = cast<LoadSDNode>(N);
     Chain = LD->getChain();
     Base = LD->getBasePtr();
     MMO = LD->getMemOperand();
     // If the MMO suggests this isn't a load of a full vector, leave
     // things alone.  For a built-in, we have to make the change for
     // correctness, so if there is a size problem that will be a bug.
     if (MMO->getSize() < 16)
       return SDValue();
     break;
   }
   case ISD::INTRINSIC_W_CHAIN: {
     MemIntrinsicSDNode *Intrin = cast<MemIntrinsicSDNode>(N);
     Chain = Intrin->getChain();
     // Similarly to the store case below, Intrin->getBasePtr() doesn't get
     // us what we want. Get operand 2 instead.
     Base = Intrin->getOperand(2);
     MMO = Intrin->getMemOperand();
     break;
   }
   }
 
   MVT VecTy = N->getValueType(0).getSimpleVT();
 
   // Do not expand to PPCISD::LXVD2X + PPCISD::XXSWAPD when the load is
   // aligned and the type is a vector with elements up to 4 bytes
   if (Subtarget.needsSwapsForVSXMemOps() && !(MMO->getAlignment()%16)
       && VecTy.getScalarSizeInBits() <= 32 ) {
     return SDValue();
   }
 
   SDValue LoadOps[] = { Chain, Base };
   SDValue Load = DAG.getMemIntrinsicNode(PPCISD::LXVD2X, dl,
                                          DAG.getVTList(MVT::v2f64, MVT::Other),
                                          LoadOps, MVT::v2f64, MMO);
 
   DCI.AddToWorklist(Load.getNode());
   Chain = Load.getValue(1);
   SDValue Swap = DAG.getNode(
       PPCISD::XXSWAPD, dl, DAG.getVTList(MVT::v2f64, MVT::Other), Chain, Load);
   DCI.AddToWorklist(Swap.getNode());
 
   // Add a bitcast if the resulting load type doesn't match v2f64.
   if (VecTy != MVT::v2f64) {
     SDValue N = DAG.getNode(ISD::BITCAST, dl, VecTy, Swap);
     DCI.AddToWorklist(N.getNode());
     // Package {bitcast value, swap's chain} to match Load's shape.
     return DAG.getNode(ISD::MERGE_VALUES, dl, DAG.getVTList(VecTy, MVT::Other),
                        N, Swap.getValue(1));
   }
 
   return Swap;
 }
 
 // expandVSXStoreForLE - Convert VSX stores (which may be intrinsics for
 // builtins) into stores with swaps.
 SDValue PPCTargetLowering::expandVSXStoreForLE(SDNode *N,
                                                DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   SDValue Chain;
   SDValue Base;
   unsigned SrcOpnd;
   MachineMemOperand *MMO;
 
   switch (N->getOpcode()) {
   default:
     llvm_unreachable("Unexpected opcode for little endian VSX store");
   case ISD::STORE: {
     StoreSDNode *ST = cast<StoreSDNode>(N);
     Chain = ST->getChain();
     Base = ST->getBasePtr();
     MMO = ST->getMemOperand();
     SrcOpnd = 1;
     // If the MMO suggests this isn't a store of a full vector, leave
     // things alone.  For a built-in, we have to make the change for
     // correctness, so if there is a size problem that will be a bug.
     if (MMO->getSize() < 16)
       return SDValue();
     break;
   }
   case ISD::INTRINSIC_VOID: {
     MemIntrinsicSDNode *Intrin = cast<MemIntrinsicSDNode>(N);
     Chain = Intrin->getChain();
     // Intrin->getBasePtr() oddly does not get what we want.
     Base = Intrin->getOperand(3);
     MMO = Intrin->getMemOperand();
     SrcOpnd = 2;
     break;
   }
   }
 
   SDValue Src = N->getOperand(SrcOpnd);
   MVT VecTy = Src.getValueType().getSimpleVT();
 
   // Do not expand to PPCISD::XXSWAPD and PPCISD::STXVD2X when the load is
   // aligned and the type is a vector with elements up to 4 bytes
   if (Subtarget.needsSwapsForVSXMemOps() && !(MMO->getAlignment()%16)
       && VecTy.getScalarSizeInBits() <= 32 ) {
     return SDValue();
   }
 
   // All stores are done as v2f64 and possible bit cast.
   if (VecTy != MVT::v2f64) {
     Src = DAG.getNode(ISD::BITCAST, dl, MVT::v2f64, Src);
     DCI.AddToWorklist(Src.getNode());
   }
 
   SDValue Swap = DAG.getNode(PPCISD::XXSWAPD, dl,
                              DAG.getVTList(MVT::v2f64, MVT::Other), Chain, Src);
   DCI.AddToWorklist(Swap.getNode());
   Chain = Swap.getValue(1);
   SDValue StoreOps[] = { Chain, Swap, Base };
   SDValue Store = DAG.getMemIntrinsicNode(PPCISD::STXVD2X, dl,
                                           DAG.getVTList(MVT::Other),
                                           StoreOps, VecTy, MMO);
   DCI.AddToWorklist(Store.getNode());
   return Store;
 }
 
 // Handle DAG combine for STORE (FP_TO_INT F).
 SDValue PPCTargetLowering::combineStoreFPToInt(SDNode *N,
                                                DAGCombinerInfo &DCI) const {
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   unsigned Opcode = N->getOperand(1).getOpcode();
 
   assert((Opcode == ISD::FP_TO_SINT || Opcode == ISD::FP_TO_UINT)
          && "Not a FP_TO_INT Instruction!");
 
   SDValue Val = N->getOperand(1).getOperand(0);
   EVT Op1VT = N->getOperand(1).getValueType();
   EVT ResVT = Val.getValueType();
 
   // Floating point types smaller than 32 bits are not legal on Power.
   if (ResVT.getScalarSizeInBits() < 32)
     return SDValue();
 
   // Only perform combine for conversion to i64/i32 or power9 i16/i8.
   bool ValidTypeForStoreFltAsInt =
         (Op1VT == MVT::i32 || Op1VT == MVT::i64 ||
          (Subtarget.hasP9Vector() && (Op1VT == MVT::i16 || Op1VT == MVT::i8)));
 
   if (ResVT == MVT::ppcf128 || !Subtarget.hasP8Altivec() ||
       cast<StoreSDNode>(N)->isTruncatingStore() || !ValidTypeForStoreFltAsInt)
     return SDValue();
 
   // Extend f32 values to f64
   if (ResVT.getScalarSizeInBits() == 32) {
     Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
     DCI.AddToWorklist(Val.getNode());
   }
 
   // Set signed or unsigned conversion opcode.
   unsigned ConvOpcode = (Opcode == ISD::FP_TO_SINT) ?
                           PPCISD::FP_TO_SINT_IN_VSR :
                           PPCISD::FP_TO_UINT_IN_VSR;
 
   Val = DAG.getNode(ConvOpcode,
                     dl, ResVT == MVT::f128 ? MVT::f128 : MVT::f64, Val);
   DCI.AddToWorklist(Val.getNode());
 
   // Set number of bytes being converted.
   unsigned ByteSize = Op1VT.getScalarSizeInBits() / 8;
   SDValue Ops[] = { N->getOperand(0), Val, N->getOperand(2),
                     DAG.getIntPtrConstant(ByteSize, dl, false),
                     DAG.getValueType(Op1VT) };
 
   Val = DAG.getMemIntrinsicNode(PPCISD::ST_VSR_SCAL_INT, dl,
           DAG.getVTList(MVT::Other), Ops,
           cast<StoreSDNode>(N)->getMemoryVT(),
           cast<StoreSDNode>(N)->getMemOperand());
 
   DCI.AddToWorklist(Val.getNode());
   return Val;
 }
 
 SDValue PPCTargetLowering::combineVReverseMemOP(ShuffleVectorSDNode *SVN,
                                                 LSBaseSDNode *LSBase,
                                                 DAGCombinerInfo &DCI) const {
   assert((ISD::isNormalLoad(LSBase) || ISD::isNormalStore(LSBase)) &&
         "Not a reverse memop pattern!");
 
   auto IsElementReverse = [](const ShuffleVectorSDNode *SVN) -> bool {
     auto Mask = SVN->getMask();
     int i = 0;
     auto I = Mask.rbegin();
     auto E = Mask.rend();
 
     for (; I != E; ++I) {
       if (*I != i)
         return false;
       i++;
     }
     return true;
   };
 
   SelectionDAG &DAG = DCI.DAG;
   EVT VT = SVN->getValueType(0);
 
   if (!isTypeLegal(VT) || !Subtarget.isLittleEndian() || !Subtarget.hasVSX())
     return SDValue();
 
   // Before P9, we have PPCVSXSwapRemoval pass to hack the element order.
   // See comment in PPCVSXSwapRemoval.cpp.
   // It is conflict with PPCVSXSwapRemoval opt. So we don't do it.
   if (!Subtarget.hasP9Vector())
     return SDValue();
 
   if(!IsElementReverse(SVN))
     return SDValue();
 
   if (LSBase->getOpcode() == ISD::LOAD) {
     SDLoc dl(SVN);
     SDValue LoadOps[] = {LSBase->getChain(), LSBase->getBasePtr()};
     return DAG.getMemIntrinsicNode(
         PPCISD::LOAD_VEC_BE, dl, DAG.getVTList(VT, MVT::Other), LoadOps,
         LSBase->getMemoryVT(), LSBase->getMemOperand());
   }
 
   if (LSBase->getOpcode() == ISD::STORE) {
     SDLoc dl(LSBase);
     SDValue StoreOps[] = {LSBase->getChain(), SVN->getOperand(0),
                           LSBase->getBasePtr()};
     return DAG.getMemIntrinsicNode(
         PPCISD::STORE_VEC_BE, dl, DAG.getVTList(MVT::Other), StoreOps,
         LSBase->getMemoryVT(), LSBase->getMemOperand());
   }
 
   llvm_unreachable("Expected a load or store node here");
 }
 
 SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
                                              DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   switch (N->getOpcode()) {
   default: break;
   case ISD::ADD:
     return combineADD(N, DCI);
   case ISD::SHL:
     return combineSHL(N, DCI);
   case ISD::SRA:
     return combineSRA(N, DCI);
   case ISD::SRL:
     return combineSRL(N, DCI);
   case ISD::MUL:
     return combineMUL(N, DCI);
   case PPCISD::SHL:
     if (isNullConstant(N->getOperand(0))) // 0 << V -> 0.
         return N->getOperand(0);
     break;
   case PPCISD::SRL:
     if (isNullConstant(N->getOperand(0))) // 0 >>u V -> 0.
         return N->getOperand(0);
     break;
   case PPCISD::SRA:
     if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
       if (C->isNullValue() ||   //  0 >>s V -> 0.
           C->isAllOnesValue())    // -1 >>s V -> -1.
         return N->getOperand(0);
     }
     break;
   case ISD::SIGN_EXTEND:
   case ISD::ZERO_EXTEND:
   case ISD::ANY_EXTEND:
     return DAGCombineExtBoolTrunc(N, DCI);
   case ISD::TRUNCATE:
     return combineTRUNCATE(N, DCI);
   case ISD::SETCC:
     if (SDValue CSCC = combineSetCC(N, DCI))
       return CSCC;
     LLVM_FALLTHROUGH;
   case ISD::SELECT_CC:
     return DAGCombineTruncBoolExt(N, DCI);
   case ISD::SINT_TO_FP:
   case ISD::UINT_TO_FP:
     return combineFPToIntToFP(N, DCI);
   case ISD::VECTOR_SHUFFLE:
     if (ISD::isNormalLoad(N->getOperand(0).getNode())) {
       LSBaseSDNode* LSBase = cast<LSBaseSDNode>(N->getOperand(0));
       return combineVReverseMemOP(cast<ShuffleVectorSDNode>(N), LSBase, DCI);
     }
     break;
   case ISD::STORE: {
 
     EVT Op1VT = N->getOperand(1).getValueType();
     unsigned Opcode = N->getOperand(1).getOpcode();
 
     if (Opcode == ISD::FP_TO_SINT || Opcode == ISD::FP_TO_UINT) {
       SDValue Val= combineStoreFPToInt(N, DCI);
       if (Val)
         return Val;
     }
 
     if (Opcode == ISD::VECTOR_SHUFFLE && ISD::isNormalStore(N)) {
       ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N->getOperand(1));
       SDValue Val= combineVReverseMemOP(SVN, cast<LSBaseSDNode>(N), DCI);
       if (Val)
         return Val;
     }
 
     // Turn STORE (BSWAP) -> sthbrx/stwbrx.
     if (cast<StoreSDNode>(N)->isUnindexed() && Opcode == ISD::BSWAP &&
         N->getOperand(1).getNode()->hasOneUse() &&
         (Op1VT == MVT::i32 || Op1VT == MVT::i16 ||
          (Subtarget.hasLDBRX() && Subtarget.isPPC64() && Op1VT == MVT::i64))) {
 
       // STBRX can only handle simple types and it makes no sense to store less
       // two bytes in byte-reversed order.
       EVT mVT = cast<StoreSDNode>(N)->getMemoryVT();
       if (mVT.isExtended() || mVT.getSizeInBits() < 16)
         break;
 
       SDValue BSwapOp = N->getOperand(1).getOperand(0);
       // Do an any-extend to 32-bits if this is a half-word input.
       if (BSwapOp.getValueType() == MVT::i16)
         BSwapOp = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, BSwapOp);
 
       // If the type of BSWAP operand is wider than stored memory width
       // it need to be shifted to the right side before STBRX.
       if (Op1VT.bitsGT(mVT)) {
         int Shift = Op1VT.getSizeInBits() - mVT.getSizeInBits();
         BSwapOp = DAG.getNode(ISD::SRL, dl, Op1VT, BSwapOp,
                               DAG.getConstant(Shift, dl, MVT::i32));
         // Need to truncate if this is a bswap of i64 stored as i32/i16.
         if (Op1VT == MVT::i64)
           BSwapOp = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, BSwapOp);
       }
 
       SDValue Ops[] = {
         N->getOperand(0), BSwapOp, N->getOperand(2), DAG.getValueType(mVT)
       };
       return
         DAG.getMemIntrinsicNode(PPCISD::STBRX, dl, DAG.getVTList(MVT::Other),
                                 Ops, cast<StoreSDNode>(N)->getMemoryVT(),
                                 cast<StoreSDNode>(N)->getMemOperand());
     }
 
     // STORE Constant:i32<0>  ->  STORE<trunc to i32> Constant:i64<0>
     // So it can increase the chance of CSE constant construction.
     if (Subtarget.isPPC64() && !DCI.isBeforeLegalize() &&
         isa<ConstantSDNode>(N->getOperand(1)) && Op1VT == MVT::i32) {
       // Need to sign-extended to 64-bits to handle negative values.
       EVT MemVT = cast<StoreSDNode>(N)->getMemoryVT();
       uint64_t Val64 = SignExtend64(N->getConstantOperandVal(1),
                                     MemVT.getSizeInBits());
       SDValue Const64 = DAG.getConstant(Val64, dl, MVT::i64);
 
       // DAG.getTruncStore() can't be used here because it doesn't accept
       // the general (base + offset) addressing mode.
       // So we use UpdateNodeOperands and setTruncatingStore instead.
       DAG.UpdateNodeOperands(N, N->getOperand(0), Const64, N->getOperand(2),
                              N->getOperand(3));
       cast<StoreSDNode>(N)->setTruncatingStore(true);
       return SDValue(N, 0);
     }
 
     // For little endian, VSX stores require generating xxswapd/lxvd2x.
     // Not needed on ISA 3.0 based CPUs since we have a non-permuting store.
     if (Op1VT.isSimple()) {
       MVT StoreVT = Op1VT.getSimpleVT();
       if (Subtarget.needsSwapsForVSXMemOps() &&
           (StoreVT == MVT::v2f64 || StoreVT == MVT::v2i64 ||
            StoreVT == MVT::v4f32 || StoreVT == MVT::v4i32))
         return expandVSXStoreForLE(N, DCI);
     }
     break;
   }
   case ISD::LOAD: {
     LoadSDNode *LD = cast<LoadSDNode>(N);
     EVT VT = LD->getValueType(0);
 
     // For little endian, VSX loads require generating lxvd2x/xxswapd.
     // Not needed on ISA 3.0 based CPUs since we have a non-permuting load.
     if (VT.isSimple()) {
       MVT LoadVT = VT.getSimpleVT();
       if (Subtarget.needsSwapsForVSXMemOps() &&
           (LoadVT == MVT::v2f64 || LoadVT == MVT::v2i64 ||
            LoadVT == MVT::v4f32 || LoadVT == MVT::v4i32))
         return expandVSXLoadForLE(N, DCI);
     }
 
     // We sometimes end up with a 64-bit integer load, from which we extract
     // two single-precision floating-point numbers. This happens with
     // std::complex<float>, and other similar structures, because of the way we
     // canonicalize structure copies. However, if we lack direct moves,
     // then the final bitcasts from the extracted integer values to the
     // floating-point numbers turn into store/load pairs. Even with direct moves,
     // just loading the two floating-point numbers is likely better.
     auto ReplaceTwoFloatLoad = [&]() {
       if (VT != MVT::i64)
         return false;
 
       if (LD->getExtensionType() != ISD::NON_EXTLOAD ||
           LD->isVolatile())
         return false;
 
       //  We're looking for a sequence like this:
       //  t13: i64,ch = load<LD8[%ref.tmp]> t0, t6, undef:i64
       //      t16: i64 = srl t13, Constant:i32<32>
       //    t17: i32 = truncate t16
       //  t18: f32 = bitcast t17
       //    t19: i32 = truncate t13
       //  t20: f32 = bitcast t19
 
       if (!LD->hasNUsesOfValue(2, 0))
         return false;
 
       auto UI = LD->use_begin();
       while (UI.getUse().getResNo() != 0) ++UI;
       SDNode *Trunc = *UI++;
       while (UI.getUse().getResNo() != 0) ++UI;
       SDNode *RightShift = *UI;
       if (Trunc->getOpcode() != ISD::TRUNCATE)
         std::swap(Trunc, RightShift);
 
       if (Trunc->getOpcode() != ISD::TRUNCATE ||
           Trunc->getValueType(0) != MVT::i32 ||
           !Trunc->hasOneUse())
         return false;
       if (RightShift->getOpcode() != ISD::SRL ||
           !isa<ConstantSDNode>(RightShift->getOperand(1)) ||
           RightShift->getConstantOperandVal(1) != 32 ||
           !RightShift->hasOneUse())
         return false;
 
       SDNode *Trunc2 = *RightShift->use_begin();
       if (Trunc2->getOpcode() != ISD::TRUNCATE ||
           Trunc2->getValueType(0) != MVT::i32 ||
           !Trunc2->hasOneUse())
         return false;
 
       SDNode *Bitcast = *Trunc->use_begin();
       SDNode *Bitcast2 = *Trunc2->use_begin();
 
       if (Bitcast->getOpcode() != ISD::BITCAST ||
           Bitcast->getValueType(0) != MVT::f32)
         return false;
       if (Bitcast2->getOpcode() != ISD::BITCAST ||
           Bitcast2->getValueType(0) != MVT::f32)
         return false;
 
       if (Subtarget.isLittleEndian())
         std::swap(Bitcast, Bitcast2);
 
       // Bitcast has the second float (in memory-layout order) and Bitcast2
       // has the first one.
 
       SDValue BasePtr = LD->getBasePtr();
       if (LD->isIndexed()) {
         assert(LD->getAddressingMode() == ISD::PRE_INC &&
                "Non-pre-inc AM on PPC?");
         BasePtr =
           DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(), BasePtr,
                       LD->getOffset());
       }
 
       auto MMOFlags =
           LD->getMemOperand()->getFlags() & ~MachineMemOperand::MOVolatile;
       SDValue FloatLoad = DAG.getLoad(MVT::f32, dl, LD->getChain(), BasePtr,
                                       LD->getPointerInfo(), LD->getAlignment(),
                                       MMOFlags, LD->getAAInfo());
       SDValue AddPtr =
         DAG.getNode(ISD::ADD, dl, BasePtr.getValueType(),
                     BasePtr, DAG.getIntPtrConstant(4, dl));
       SDValue FloatLoad2 = DAG.getLoad(
           MVT::f32, dl, SDValue(FloatLoad.getNode(), 1), AddPtr,
           LD->getPointerInfo().getWithOffset(4),
           MinAlign(LD->getAlignment(), 4), MMOFlags, LD->getAAInfo());
 
       if (LD->isIndexed()) {
         // Note that DAGCombine should re-form any pre-increment load(s) from
         // what is produced here if that makes sense.
         DAG.ReplaceAllUsesOfValueWith(SDValue(LD, 1), BasePtr);
       }
 
       DCI.CombineTo(Bitcast2, FloatLoad);
       DCI.CombineTo(Bitcast, FloatLoad2);
 
       DAG.ReplaceAllUsesOfValueWith(SDValue(LD, LD->isIndexed() ? 2 : 1),
                                     SDValue(FloatLoad2.getNode(), 1));
       return true;
     };
 
     if (ReplaceTwoFloatLoad())
       return SDValue(N, 0);
 
     EVT MemVT = LD->getMemoryVT();
     Type *Ty = MemVT.getTypeForEVT(*DAG.getContext());
     unsigned ABIAlignment = DAG.getDataLayout().getABITypeAlignment(Ty);
     Type *STy = MemVT.getScalarType().getTypeForEVT(*DAG.getContext());
     unsigned ScalarABIAlignment = DAG.getDataLayout().getABITypeAlignment(STy);
     if (LD->isUnindexed() && VT.isVector() &&
         ((Subtarget.hasAltivec() && ISD::isNON_EXTLoad(N) &&
           // P8 and later hardware should just use LOAD.
           !Subtarget.hasP8Vector() && (VT == MVT::v16i8 || VT == MVT::v8i16 ||
                                        VT == MVT::v4i32 || VT == MVT::v4f32)) ||
          (Subtarget.hasQPX() && (VT == MVT::v4f64 || VT == MVT::v4f32) &&
           LD->getAlignment() >= ScalarABIAlignment)) &&
         LD->getAlignment() < ABIAlignment) {
       // This is a type-legal unaligned Altivec or QPX load.
       SDValue Chain = LD->getChain();
       SDValue Ptr = LD->getBasePtr();
       bool isLittleEndian = Subtarget.isLittleEndian();
 
       // This implements the loading of unaligned vectors as described in
       // the venerable Apple Velocity Engine overview. Specifically:
       // https://developer.apple.com/hardwaredrivers/ve/alignment.html
       // https://developer.apple.com/hardwaredrivers/ve/code_optimization.html
       //
       // The general idea is to expand a sequence of one or more unaligned
       // loads into an alignment-based permutation-control instruction (lvsl
       // or lvsr), a series of regular vector loads (which always truncate
       // their input address to an aligned address), and a series of
       // permutations.  The results of these permutations are the requested
       // loaded values.  The trick is that the last "extra" load is not taken
       // from the address you might suspect (sizeof(vector) bytes after the
       // last requested load), but rather sizeof(vector) - 1 bytes after the
       // last requested vector. The point of this is to avoid a page fault if
       // the base address happened to be aligned. This works because if the
       // base address is aligned, then adding less than a full vector length
       // will cause the last vector in the sequence to be (re)loaded.
       // Otherwise, the next vector will be fetched as you might suspect was
       // necessary.
 
       // We might be able to reuse the permutation generation from
       // a different base address offset from this one by an aligned amount.
       // The INTRINSIC_WO_CHAIN DAG combine will attempt to perform this
       // optimization later.
       Intrinsic::ID Intr, IntrLD, IntrPerm;
       MVT PermCntlTy, PermTy, LDTy;
       if (Subtarget.hasAltivec()) {
         Intr = isLittleEndian ?  Intrinsic::ppc_altivec_lvsr :
                                  Intrinsic::ppc_altivec_lvsl;
         IntrLD = Intrinsic::ppc_altivec_lvx;
         IntrPerm = Intrinsic::ppc_altivec_vperm;
         PermCntlTy = MVT::v16i8;
         PermTy = MVT::v4i32;
         LDTy = MVT::v4i32;
       } else {
         Intr =   MemVT == MVT::v4f64 ? Intrinsic::ppc_qpx_qvlpcld :
                                        Intrinsic::ppc_qpx_qvlpcls;
         IntrLD = MemVT == MVT::v4f64 ? Intrinsic::ppc_qpx_qvlfd :
                                        Intrinsic::ppc_qpx_qvlfs;
         IntrPerm = Intrinsic::ppc_qpx_qvfperm;
         PermCntlTy = MVT::v4f64;
         PermTy = MVT::v4f64;
         LDTy = MemVT.getSimpleVT();
       }
 
       SDValue PermCntl = BuildIntrinsicOp(Intr, Ptr, DAG, dl, PermCntlTy);
 
       // Create the new MMO for the new base load. It is like the original MMO,
       // but represents an area in memory almost twice the vector size centered
       // on the original address. If the address is unaligned, we might start
       // reading up to (sizeof(vector)-1) bytes below the address of the
       // original unaligned load.
       MachineFunction &MF = DAG.getMachineFunction();
       MachineMemOperand *BaseMMO =
         MF.getMachineMemOperand(LD->getMemOperand(),
                                 -(long)MemVT.getStoreSize()+1,
                                 2*MemVT.getStoreSize()-1);
 
       // Create the new base load.
       SDValue LDXIntID =
           DAG.getTargetConstant(IntrLD, dl, getPointerTy(MF.getDataLayout()));
       SDValue BaseLoadOps[] = { Chain, LDXIntID, Ptr };
       SDValue BaseLoad =
         DAG.getMemIntrinsicNode(ISD::INTRINSIC_W_CHAIN, dl,
                                 DAG.getVTList(PermTy, MVT::Other),
                                 BaseLoadOps, LDTy, BaseMMO);
 
       // Note that the value of IncOffset (which is provided to the next
       // load's pointer info offset value, and thus used to calculate the
       // alignment), and the value of IncValue (which is actually used to
       // increment the pointer value) are different! This is because we
       // require the next load to appear to be aligned, even though it
       // is actually offset from the base pointer by a lesser amount.
       int IncOffset = VT.getSizeInBits() / 8;
       int IncValue = IncOffset;
 
       // Walk (both up and down) the chain looking for another load at the real
       // (aligned) offset (the alignment of the other load does not matter in
       // this case). If found, then do not use the offset reduction trick, as
       // that will prevent the loads from being later combined (as they would
       // otherwise be duplicates).
       if (!findConsecutiveLoad(LD, DAG))
         --IncValue;
 
       SDValue Increment =
           DAG.getConstant(IncValue, dl, getPointerTy(MF.getDataLayout()));
       Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
 
       MachineMemOperand *ExtraMMO =
         MF.getMachineMemOperand(LD->getMemOperand(),
                                 1, 2*MemVT.getStoreSize()-1);
       SDValue ExtraLoadOps[] = { Chain, LDXIntID, Ptr };
       SDValue ExtraLoad =
         DAG.getMemIntrinsicNode(ISD::INTRINSIC_W_CHAIN, dl,
                                 DAG.getVTList(PermTy, MVT::Other),
                                 ExtraLoadOps, LDTy, ExtraMMO);
 
       SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
         BaseLoad.getValue(1), ExtraLoad.getValue(1));
 
       // Because vperm has a big-endian bias, we must reverse the order
       // of the input vectors and complement the permute control vector
       // when generating little endian code.  We have already handled the
       // latter by using lvsr instead of lvsl, so just reverse BaseLoad
       // and ExtraLoad here.
       SDValue Perm;
       if (isLittleEndian)
         Perm = BuildIntrinsicOp(IntrPerm,
                                 ExtraLoad, BaseLoad, PermCntl, DAG, dl);
       else
         Perm = BuildIntrinsicOp(IntrPerm,
                                 BaseLoad, ExtraLoad, PermCntl, DAG, dl);
 
       if (VT != PermTy)
         Perm = Subtarget.hasAltivec() ?
                  DAG.getNode(ISD::BITCAST, dl, VT, Perm) :
                  DAG.getNode(ISD::FP_ROUND, dl, VT, Perm, // QPX
                                DAG.getTargetConstant(1, dl, MVT::i64));
                                // second argument is 1 because this rounding
                                // is always exact.
 
       // The output of the permutation is our loaded result, the TokenFactor is
       // our new chain.
       DCI.CombineTo(N, Perm, TF);
       return SDValue(N, 0);
     }
     }
     break;
     case ISD::INTRINSIC_WO_CHAIN: {
       bool isLittleEndian = Subtarget.isLittleEndian();
       unsigned IID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
       Intrinsic::ID Intr = (isLittleEndian ? Intrinsic::ppc_altivec_lvsr
                                            : Intrinsic::ppc_altivec_lvsl);
       if ((IID == Intr ||
            IID == Intrinsic::ppc_qpx_qvlpcld  ||
            IID == Intrinsic::ppc_qpx_qvlpcls) &&
         N->getOperand(1)->getOpcode() == ISD::ADD) {
         SDValue Add = N->getOperand(1);
 
         int Bits = IID == Intrinsic::ppc_qpx_qvlpcld ?
                    5 /* 32 byte alignment */ : 4 /* 16 byte alignment */;
 
         if (DAG.MaskedValueIsZero(Add->getOperand(1),
                                   APInt::getAllOnesValue(Bits /* alignment */)
                                       .zext(Add.getScalarValueSizeInBits()))) {
           SDNode *BasePtr = Add->getOperand(0).getNode();
           for (SDNode::use_iterator UI = BasePtr->use_begin(),
                                     UE = BasePtr->use_end();
                UI != UE; ++UI) {
             if (UI->getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
                 cast<ConstantSDNode>(UI->getOperand(0))->getZExtValue() == IID) {
               // We've found another LVSL/LVSR, and this address is an aligned
               // multiple of that one. The results will be the same, so use the
               // one we've just found instead.
 
               return SDValue(*UI, 0);
             }
           }
         }
 
         if (isa<ConstantSDNode>(Add->getOperand(1))) {
           SDNode *BasePtr = Add->getOperand(0).getNode();
           for (SDNode::use_iterator UI = BasePtr->use_begin(),
                UE = BasePtr->use_end(); UI != UE; ++UI) {
             if (UI->getOpcode() == ISD::ADD &&
                 isa<ConstantSDNode>(UI->getOperand(1)) &&
                 (cast<ConstantSDNode>(Add->getOperand(1))->getZExtValue() -
                  cast<ConstantSDNode>(UI->getOperand(1))->getZExtValue()) %
                 (1ULL << Bits) == 0) {
               SDNode *OtherAdd = *UI;
               for (SDNode::use_iterator VI = OtherAdd->use_begin(),
                    VE = OtherAdd->use_end(); VI != VE; ++VI) {
                 if (VI->getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
                     cast<ConstantSDNode>(VI->getOperand(0))->getZExtValue() == IID) {
                   return SDValue(*VI, 0);
                 }
               }
             }
           }
         }
       }
 
       // Combine vmaxsw/h/b(a, a's negation) to abs(a)
       // Expose the vabsduw/h/b opportunity for down stream
       if (!DCI.isAfterLegalizeDAG() && Subtarget.hasP9Altivec() &&
           (IID == Intrinsic::ppc_altivec_vmaxsw ||
            IID == Intrinsic::ppc_altivec_vmaxsh ||
            IID == Intrinsic::ppc_altivec_vmaxsb)) {
         SDValue V1 = N->getOperand(1);
         SDValue V2 = N->getOperand(2);
         if ((V1.getSimpleValueType() == MVT::v4i32 ||
              V1.getSimpleValueType() == MVT::v8i16 ||
              V1.getSimpleValueType() == MVT::v16i8) &&
             V1.getSimpleValueType() == V2.getSimpleValueType()) {
           // (0-a, a)
           if (V1.getOpcode() == ISD::SUB &&
               ISD::isBuildVectorAllZeros(V1.getOperand(0).getNode()) &&
               V1.getOperand(1) == V2) {
             return DAG.getNode(ISD::ABS, dl, V2.getValueType(), V2);
           }
           // (a, 0-a)
           if (V2.getOpcode() == ISD::SUB &&
               ISD::isBuildVectorAllZeros(V2.getOperand(0).getNode()) &&
               V2.getOperand(1) == V1) {
             return DAG.getNode(ISD::ABS, dl, V1.getValueType(), V1);
           }
           // (x-y, y-x)
           if (V1.getOpcode() == ISD::SUB && V2.getOpcode() == ISD::SUB &&
               V1.getOperand(0) == V2.getOperand(1) &&
               V1.getOperand(1) == V2.getOperand(0)) {
             return DAG.getNode(ISD::ABS, dl, V1.getValueType(), V1);
           }
         }
       }
     }
 
     break;
   case ISD::INTRINSIC_W_CHAIN:
     // For little endian, VSX loads require generating lxvd2x/xxswapd.
     // Not needed on ISA 3.0 based CPUs since we have a non-permuting load.
     if (Subtarget.needsSwapsForVSXMemOps()) {
       switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
       default:
         break;
       case Intrinsic::ppc_vsx_lxvw4x:
       case Intrinsic::ppc_vsx_lxvd2x:
         return expandVSXLoadForLE(N, DCI);
       }
     }
     break;
   case ISD::INTRINSIC_VOID:
     // For little endian, VSX stores require generating xxswapd/stxvd2x.
     // Not needed on ISA 3.0 based CPUs since we have a non-permuting store.
     if (Subtarget.needsSwapsForVSXMemOps()) {
       switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
       default:
         break;
       case Intrinsic::ppc_vsx_stxvw4x:
       case Intrinsic::ppc_vsx_stxvd2x:
         return expandVSXStoreForLE(N, DCI);
       }
     }
     break;
   case ISD::BSWAP:
     // Turn BSWAP (LOAD) -> lhbrx/lwbrx.
     if (ISD::isNON_EXTLoad(N->getOperand(0).getNode()) &&
         N->getOperand(0).hasOneUse() &&
         (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16 ||
          (Subtarget.hasLDBRX() && Subtarget.isPPC64() &&
           N->getValueType(0) == MVT::i64))) {
       SDValue Load = N->getOperand(0);
       LoadSDNode *LD = cast<LoadSDNode>(Load);
       // Create the byte-swapping load.
       SDValue Ops[] = {
         LD->getChain(),    // Chain
         LD->getBasePtr(),  // Ptr
         DAG.getValueType(N->getValueType(0)) // VT
       };
       SDValue BSLoad =
         DAG.getMemIntrinsicNode(PPCISD::LBRX, dl,
                                 DAG.getVTList(N->getValueType(0) == MVT::i64 ?
                                               MVT::i64 : MVT::i32, MVT::Other),
                                 Ops, LD->getMemoryVT(), LD->getMemOperand());
 
       // If this is an i16 load, insert the truncate.
       SDValue ResVal = BSLoad;
       if (N->getValueType(0) == MVT::i16)
         ResVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, BSLoad);
 
       // First, combine the bswap away.  This makes the value produced by the
       // load dead.
       DCI.CombineTo(N, ResVal);
 
       // Next, combine the load away, we give it a bogus result value but a real
       // chain result.  The result value is dead because the bswap is dead.
       DCI.CombineTo(Load.getNode(), ResVal, BSLoad.getValue(1));
 
       // Return N so it doesn't get rechecked!
       return SDValue(N, 0);
     }
     break;
   case PPCISD::VCMP:
     // If a VCMPo node already exists with exactly the same operands as this
     // node, use its result instead of this node (VCMPo computes both a CR6 and
     // a normal output).
     //
     if (!N->getOperand(0).hasOneUse() &&
         !N->getOperand(1).hasOneUse() &&
         !N->getOperand(2).hasOneUse()) {
 
       // Scan all of the users of the LHS, looking for VCMPo's that match.
       SDNode *VCMPoNode = nullptr;
 
       SDNode *LHSN = N->getOperand(0).getNode();
       for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
            UI != E; ++UI)
         if (UI->getOpcode() == PPCISD::VCMPo &&
             UI->getOperand(1) == N->getOperand(1) &&
             UI->getOperand(2) == N->getOperand(2) &&
             UI->getOperand(0) == N->getOperand(0)) {
           VCMPoNode = *UI;
           break;
         }
 
       // If there is no VCMPo node, or if the flag value has a single use, don't
       // transform this.
       if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
         break;
 
       // Look at the (necessarily single) use of the flag value.  If it has a
       // chain, this transformation is more complex.  Note that multiple things
       // could use the value result, which we should ignore.
       SDNode *FlagUser = nullptr;
       for (SDNode::use_iterator UI = VCMPoNode->use_begin();
            FlagUser == nullptr; ++UI) {
         assert(UI != VCMPoNode->use_end() && "Didn't find user!");
         SDNode *User = *UI;
         for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
           if (User->getOperand(i) == SDValue(VCMPoNode, 1)) {
             FlagUser = User;
             break;
           }
         }
       }
 
       // If the user is a MFOCRF instruction, we know this is safe.
       // Otherwise we give up for right now.
       if (FlagUser->getOpcode() == PPCISD::MFOCRF)
         return SDValue(VCMPoNode, 0);
     }
     break;
   case ISD::BRCOND: {
     SDValue Cond = N->getOperand(1);
     SDValue Target = N->getOperand(2);
 
     if (Cond.getOpcode() == ISD::INTRINSIC_W_CHAIN &&
         cast<ConstantSDNode>(Cond.getOperand(1))->getZExtValue() ==
           Intrinsic::loop_decrement) {
 
       // We now need to make the intrinsic dead (it cannot be instruction
       // selected).
       DAG.ReplaceAllUsesOfValueWith(Cond.getValue(1), Cond.getOperand(0));
       assert(Cond.getNode()->hasOneUse() &&
              "Counter decrement has more than one use");
 
       return DAG.getNode(PPCISD::BDNZ, dl, MVT::Other,
                          N->getOperand(0), Target);
     }
   }
   break;
   case ISD::BR_CC: {
     // If this is a branch on an altivec predicate comparison, lower this so
     // that we don't have to do a MFOCRF: instead, branch directly on CR6.  This
     // lowering is done pre-legalize, because the legalizer lowers the predicate
     // compare down to code that is difficult to reassemble.
     ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
     SDValue LHS = N->getOperand(2), RHS = N->getOperand(3);
 
     // Sometimes the promoted value of the intrinsic is ANDed by some non-zero
     // value. If so, pass-through the AND to get to the intrinsic.
     if (LHS.getOpcode() == ISD::AND &&
         LHS.getOperand(0).getOpcode() == ISD::INTRINSIC_W_CHAIN &&
         cast<ConstantSDNode>(LHS.getOperand(0).getOperand(1))->getZExtValue() ==
           Intrinsic::loop_decrement &&
         isa<ConstantSDNode>(LHS.getOperand(1)) &&
         !isNullConstant(LHS.getOperand(1)))
       LHS = LHS.getOperand(0);
 
     if (LHS.getOpcode() == ISD::INTRINSIC_W_CHAIN &&
         cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() ==
           Intrinsic::loop_decrement &&
         isa<ConstantSDNode>(RHS)) {
       assert((CC == ISD::SETEQ || CC == ISD::SETNE) &&
              "Counter decrement comparison is not EQ or NE");
 
       unsigned Val = cast<ConstantSDNode>(RHS)->getZExtValue();
       bool isBDNZ = (CC == ISD::SETEQ && Val) ||
                     (CC == ISD::SETNE && !Val);
 
       // We now need to make the intrinsic dead (it cannot be instruction
       // selected).
       DAG.ReplaceAllUsesOfValueWith(LHS.getValue(1), LHS.getOperand(0));
       assert(LHS.getNode()->hasOneUse() &&
              "Counter decrement has more than one use");
 
       return DAG.getNode(isBDNZ ? PPCISD::BDNZ : PPCISD::BDZ, dl, MVT::Other,
                          N->getOperand(0), N->getOperand(4));
     }
 
     int CompareOpc;
     bool isDot;
 
     if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
         isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
         getVectorCompareInfo(LHS, CompareOpc, isDot, Subtarget)) {
       assert(isDot && "Can't compare against a vector result!");
 
       // If this is a comparison against something other than 0/1, then we know
       // that the condition is never/always true.
       unsigned Val = cast<ConstantSDNode>(RHS)->getZExtValue();
       if (Val != 0 && Val != 1) {
         if (CC == ISD::SETEQ)      // Cond never true, remove branch.
           return N->getOperand(0);
         // Always !=, turn it into an unconditional branch.
         return DAG.getNode(ISD::BR, dl, MVT::Other,
                            N->getOperand(0), N->getOperand(4));
       }
 
       bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
 
       // Create the PPCISD altivec 'dot' comparison node.
       SDValue Ops[] = {
         LHS.getOperand(2),  // LHS of compare
         LHS.getOperand(3),  // RHS of compare
         DAG.getConstant(CompareOpc, dl, MVT::i32)
       };
       EVT VTs[] = { LHS.getOperand(2).getValueType(), MVT::Glue };
       SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops);
 
       // Unpack the result based on how the target uses it.
       PPC::Predicate CompOpc;
       switch (cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue()) {
       default:  // Can't happen, don't crash on invalid number though.
       case 0:   // Branch on the value of the EQ bit of CR6.
         CompOpc = BranchOnWhenPredTrue ? PPC::PRED_EQ : PPC::PRED_NE;
         break;
       case 1:   // Branch on the inverted value of the EQ bit of CR6.
         CompOpc = BranchOnWhenPredTrue ? PPC::PRED_NE : PPC::PRED_EQ;
         break;
       case 2:   // Branch on the value of the LT bit of CR6.
         CompOpc = BranchOnWhenPredTrue ? PPC::PRED_LT : PPC::PRED_GE;
         break;
       case 3:   // Branch on the inverted value of the LT bit of CR6.
         CompOpc = BranchOnWhenPredTrue ? PPC::PRED_GE : PPC::PRED_LT;
         break;
       }
 
       return DAG.getNode(PPCISD::COND_BRANCH, dl, MVT::Other, N->getOperand(0),
                          DAG.getConstant(CompOpc, dl, MVT::i32),
                          DAG.getRegister(PPC::CR6, MVT::i32),
                          N->getOperand(4), CompNode.getValue(1));
     }
     break;
   }
   case ISD::BUILD_VECTOR:
     return DAGCombineBuildVector(N, DCI);
   case ISD::ABS:
     return combineABS(N, DCI);
   case ISD::VSELECT:
     return combineVSelect(N, DCI);
   }
 
   return SDValue();
 }
 
 SDValue
 PPCTargetLowering::BuildSDIVPow2(SDNode *N, const APInt &Divisor,
                                  SelectionDAG &DAG,
                                  SmallVectorImpl<SDNode *> &Created) const {
   // fold (sdiv X, pow2)
   EVT VT = N->getValueType(0);
   if (VT == MVT::i64 && !Subtarget.isPPC64())
     return SDValue();
   if ((VT != MVT::i32 && VT != MVT::i64) ||
       !(Divisor.isPowerOf2() || (-Divisor).isPowerOf2()))
     return SDValue();
 
   SDLoc DL(N);
   SDValue N0 = N->getOperand(0);
 
   bool IsNegPow2 = (-Divisor).isPowerOf2();
   unsigned Lg2 = (IsNegPow2 ? -Divisor : Divisor).countTrailingZeros();
   SDValue ShiftAmt = DAG.getConstant(Lg2, DL, VT);
 
   SDValue Op = DAG.getNode(PPCISD::SRA_ADDZE, DL, VT, N0, ShiftAmt);
   Created.push_back(Op.getNode());
 
   if (IsNegPow2) {
     Op = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, DL, VT), Op);
     Created.push_back(Op.getNode());
   }
 
   return Op;
 }
 
 //===----------------------------------------------------------------------===//
 // Inline Assembly Support
 //===----------------------------------------------------------------------===//
 
 void PPCTargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
                                                       KnownBits &Known,
                                                       const APInt &DemandedElts,
                                                       const SelectionDAG &DAG,
                                                       unsigned Depth) const {
   Known.resetAll();
   switch (Op.getOpcode()) {
   default: break;
   case PPCISD::LBRX: {
     // lhbrx is known to have the top bits cleared out.
     if (cast<VTSDNode>(Op.getOperand(2))->getVT() == MVT::i16)
       Known.Zero = 0xFFFF0000;
     break;
   }
   case ISD::INTRINSIC_WO_CHAIN: {
     switch (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue()) {
     default: break;
     case Intrinsic::ppc_altivec_vcmpbfp_p:
     case Intrinsic::ppc_altivec_vcmpeqfp_p:
     case Intrinsic::ppc_altivec_vcmpequb_p:
     case Intrinsic::ppc_altivec_vcmpequh_p:
     case Intrinsic::ppc_altivec_vcmpequw_p:
     case Intrinsic::ppc_altivec_vcmpequd_p:
     case Intrinsic::ppc_altivec_vcmpgefp_p:
     case Intrinsic::ppc_altivec_vcmpgtfp_p:
     case Intrinsic::ppc_altivec_vcmpgtsb_p:
     case Intrinsic::ppc_altivec_vcmpgtsh_p:
     case Intrinsic::ppc_altivec_vcmpgtsw_p:
     case Intrinsic::ppc_altivec_vcmpgtsd_p:
     case Intrinsic::ppc_altivec_vcmpgtub_p:
     case Intrinsic::ppc_altivec_vcmpgtuh_p:
     case Intrinsic::ppc_altivec_vcmpgtuw_p:
     case Intrinsic::ppc_altivec_vcmpgtud_p:
       Known.Zero = ~1U;  // All bits but the low one are known to be zero.
       break;
     }
   }
   }
 }
 
 Align PPCTargetLowering::getPrefLoopAlignment(MachineLoop *ML) const {
   switch (Subtarget.getCPUDirective()) {
   default: break;
   case PPC::DIR_970:
   case PPC::DIR_PWR4:
   case PPC::DIR_PWR5:
   case PPC::DIR_PWR5X:
   case PPC::DIR_PWR6:
   case PPC::DIR_PWR6X:
   case PPC::DIR_PWR7:
   case PPC::DIR_PWR8:
   case PPC::DIR_PWR9:
   case PPC::DIR_PWR_FUTURE: {
     if (!ML)
       break;
 
     if (!DisableInnermostLoopAlign32) {
       // If the nested loop is an innermost loop, prefer to a 32-byte alignment,
       // so that we can decrease cache misses and branch-prediction misses.
       // Actual alignment of the loop will depend on the hotness check and other
       // logic in alignBlocks.
       if (ML->getLoopDepth() > 1 && ML->getSubLoops().empty())
         return Align(32);
     }
 
     const PPCInstrInfo *TII = Subtarget.getInstrInfo();
 
     // For small loops (between 5 and 8 instructions), align to a 32-byte
     // boundary so that the entire loop fits in one instruction-cache line.
     uint64_t LoopSize = 0;
     for (auto I = ML->block_begin(), IE = ML->block_end(); I != IE; ++I)
       for (auto J = (*I)->begin(), JE = (*I)->end(); J != JE; ++J) {
         LoopSize += TII->getInstSizeInBytes(*J);
         if (LoopSize > 32)
           break;
       }
 
     if (LoopSize > 16 && LoopSize <= 32)
       return Align(32);
 
     break;
   }
   }
 
   return TargetLowering::getPrefLoopAlignment(ML);
 }
 
 /// getConstraintType - Given a constraint, return the type of
 /// constraint it is for this target.
 PPCTargetLowering::ConstraintType
 PPCTargetLowering::getConstraintType(StringRef Constraint) const {
   if (Constraint.size() == 1) {
     switch (Constraint[0]) {
     default: break;
     case 'b':
     case 'r':
     case 'f':
     case 'd':
     case 'v':
     case 'y':
       return C_RegisterClass;
     case 'Z':
       // FIXME: While Z does indicate a memory constraint, it specifically
       // indicates an r+r address (used in conjunction with the 'y' modifier
       // in the replacement string). Currently, we're forcing the base
       // register to be r0 in the asm printer (which is interpreted as zero)
       // and forming the complete address in the second register. This is
       // suboptimal.
       return C_Memory;
     }
   } else if (Constraint == "wc") { // individual CR bits.
     return C_RegisterClass;
   } else if (Constraint == "wa" || Constraint == "wd" ||
              Constraint == "wf" || Constraint == "ws" ||
              Constraint == "wi" || Constraint == "ww") {
     return C_RegisterClass; // VSX registers.
   }
   return TargetLowering::getConstraintType(Constraint);
 }
 
 /// Examine constraint type and operand type and determine a weight value.
 /// This object must already have been set up with the operand type
 /// and the current alternative constraint selected.
 TargetLowering::ConstraintWeight
 PPCTargetLowering::getSingleConstraintMatchWeight(
     AsmOperandInfo &info, const char *constraint) const {
   ConstraintWeight weight = CW_Invalid;
   Value *CallOperandVal = info.CallOperandVal;
     // If we don't have a value, we can't do a match,
     // but allow it at the lowest weight.
   if (!CallOperandVal)
     return CW_Default;
   Type *type = CallOperandVal->getType();
 
   // Look at the constraint type.
   if (StringRef(constraint) == "wc" && type->isIntegerTy(1))
     return CW_Register; // an individual CR bit.
   else if ((StringRef(constraint) == "wa" ||
             StringRef(constraint) == "wd" ||
             StringRef(constraint) == "wf") &&
            type->isVectorTy())
     return CW_Register;
   else if (StringRef(constraint) == "wi" && type->isIntegerTy(64))
     return CW_Register; // just hold 64-bit integers data.
   else if (StringRef(constraint) == "ws" && type->isDoubleTy())
     return CW_Register;
   else if (StringRef(constraint) == "ww" && type->isFloatTy())
     return CW_Register;
 
   switch (*constraint) {
   default:
     weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
     break;
   case 'b':
     if (type->isIntegerTy())
       weight = CW_Register;
     break;
   case 'f':
     if (type->isFloatTy())
       weight = CW_Register;
     break;
   case 'd':
     if (type->isDoubleTy())
       weight = CW_Register;
     break;
   case 'v':
     if (type->isVectorTy())
       weight = CW_Register;
     break;
   case 'y':
     weight = CW_Register;
     break;
   case 'Z':
     weight = CW_Memory;
     break;
   }
   return weight;
 }
 
 std::pair<unsigned, const TargetRegisterClass *>
 PPCTargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
                                                 StringRef Constraint,
                                                 MVT VT) const {
   if (Constraint.size() == 1) {
     // GCC RS6000 Constraint Letters
     switch (Constraint[0]) {
     case 'b':   // R1-R31
       if (VT == MVT::i64 && Subtarget.isPPC64())
         return std::make_pair(0U, &PPC::G8RC_NOX0RegClass);
       return std::make_pair(0U, &PPC::GPRC_NOR0RegClass);
     case 'r':   // R0-R31
       if (VT == MVT::i64 && Subtarget.isPPC64())
         return std::make_pair(0U, &PPC::G8RCRegClass);
       return std::make_pair(0U, &PPC::GPRCRegClass);
     // 'd' and 'f' constraints are both defined to be "the floating point
     // registers", where one is for 32-bit and the other for 64-bit. We don't
     // really care overly much here so just give them all the same reg classes.
     case 'd':
     case 'f':
       if (Subtarget.hasSPE()) {
         if (VT == MVT::f32 || VT == MVT::i32)
           return std::make_pair(0U, &PPC::GPRCRegClass);
         if (VT == MVT::f64 || VT == MVT::i64)
           return std::make_pair(0U, &PPC::SPERCRegClass);
       } else {
         if (VT == MVT::f32 || VT == MVT::i32)
           return std::make_pair(0U, &PPC::F4RCRegClass);
         if (VT == MVT::f64 || VT == MVT::i64)
           return std::make_pair(0U, &PPC::F8RCRegClass);
         if (VT == MVT::v4f64 && Subtarget.hasQPX())
           return std::make_pair(0U, &PPC::QFRCRegClass);
         if (VT == MVT::v4f32 && Subtarget.hasQPX())
           return std::make_pair(0U, &PPC::QSRCRegClass);
       }
       break;
     case 'v':
       if (VT == MVT::v4f64 && Subtarget.hasQPX())
         return std::make_pair(0U, &PPC::QFRCRegClass);
       if (VT == MVT::v4f32 && Subtarget.hasQPX())
         return std::make_pair(0U, &PPC::QSRCRegClass);
       if (Subtarget.hasAltivec())
         return std::make_pair(0U, &PPC::VRRCRegClass);
       break;
     case 'y':   // crrc
       return std::make_pair(0U, &PPC::CRRCRegClass);
     }
   } else if (Constraint == "wc" && Subtarget.useCRBits()) {
     // An individual CR bit.
     return std::make_pair(0U, &PPC::CRBITRCRegClass);
   } else if ((Constraint == "wa" || Constraint == "wd" ||
              Constraint == "wf" || Constraint == "wi") &&
              Subtarget.hasVSX()) {
     return std::make_pair(0U, &PPC::VSRCRegClass);
   } else if ((Constraint == "ws" || Constraint == "ww") && Subtarget.hasVSX()) {
     if (VT == MVT::f32 && Subtarget.hasP8Vector())
       return std::make_pair(0U, &PPC::VSSRCRegClass);
     else
       return std::make_pair(0U, &PPC::VSFRCRegClass);
   }
 
   // If we name a VSX register, we can't defer to the base class because it
   // will not recognize the correct register (their names will be VSL{0-31}
   // and V{0-31} so they won't match). So we match them here.
   if (Constraint.size() > 3 && Constraint[1] == 'v' && Constraint[2] == 's') {
     int VSNum = atoi(Constraint.data() + 3);
     assert(VSNum >= 0 && VSNum <= 63 &&
            "Attempted to access a vsr out of range");
     if (VSNum < 32)
       return std::make_pair(PPC::VSL0 + VSNum, &PPC::VSRCRegClass);
     return std::make_pair(PPC::V0 + VSNum - 32, &PPC::VSRCRegClass);
   }
   std::pair<unsigned, const TargetRegisterClass *> R =
       TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
 
   // r[0-9]+ are used, on PPC64, to refer to the corresponding 64-bit registers
   // (which we call X[0-9]+). If a 64-bit value has been requested, and a
   // 32-bit GPR has been selected, then 'upgrade' it to the 64-bit parent
   // register.
   // FIXME: If TargetLowering::getRegForInlineAsmConstraint could somehow use
   // the AsmName field from *RegisterInfo.td, then this would not be necessary.
   if (R.first && VT == MVT::i64 && Subtarget.isPPC64() &&
       PPC::GPRCRegClass.contains(R.first))
     return std::make_pair(TRI->getMatchingSuperReg(R.first,
                             PPC::sub_32, &PPC::G8RCRegClass),
                           &PPC::G8RCRegClass);
 
   // GCC accepts 'cc' as an alias for 'cr0', and we need to do the same.
   if (!R.second && StringRef("{cc}").equals_lower(Constraint)) {
     R.first = PPC::CR0;
     R.second = &PPC::CRRCRegClass;
   }
 
   return R;
 }
 
 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
 /// vector.  If it is invalid, don't add anything to Ops.
 void PPCTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
                                                      std::string &Constraint,
                                                      std::vector<SDValue>&Ops,
                                                      SelectionDAG &DAG) const {
   SDValue Result;
 
   // Only support length 1 constraints.
   if (Constraint.length() > 1) return;
 
   char Letter = Constraint[0];
   switch (Letter) {
   default: break;
   case 'I':
   case 'J':
   case 'K':
   case 'L':
   case 'M':
   case 'N':
   case 'O':
   case 'P': {
     ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
     if (!CST) return; // Must be an immediate to match.
     SDLoc dl(Op);
     int64_t Value = CST->getSExtValue();
     EVT TCVT = MVT::i64; // All constants taken to be 64 bits so that negative
                          // numbers are printed as such.
     switch (Letter) {
     default: llvm_unreachable("Unknown constraint letter!");
     case 'I':  // "I" is a signed 16-bit constant.
       if (isInt<16>(Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'J':  // "J" is a constant with only the high-order 16 bits nonzero.
       if (isShiftedUInt<16, 16>(Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'L':  // "L" is a signed 16-bit constant shifted left 16 bits.
       if (isShiftedInt<16, 16>(Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'K':  // "K" is a constant with only the low-order 16 bits nonzero.
       if (isUInt<16>(Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'M':  // "M" is a constant that is greater than 31.
       if (Value > 31)
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'N':  // "N" is a positive constant that is an exact power of two.
       if (Value > 0 && isPowerOf2_64(Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'O':  // "O" is the constant zero.
       if (Value == 0)
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     case 'P':  // "P" is a constant whose negation is a signed 16-bit constant.
       if (isInt<16>(-Value))
         Result = DAG.getTargetConstant(Value, dl, TCVT);
       break;
     }
     break;
   }
   }
 
   if (Result.getNode()) {
     Ops.push_back(Result);
     return;
   }
 
   // Handle standard constraint letters.
   TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
 }
 
 // isLegalAddressingMode - Return true if the addressing mode represented
 // by AM is legal for this target, for a load/store of the specified type.
 bool PPCTargetLowering::isLegalAddressingMode(const DataLayout &DL,
                                               const AddrMode &AM, Type *Ty,
                                               unsigned AS, Instruction *I) const {
   // PPC does not allow r+i addressing modes for vectors!
   if (Ty->isVectorTy() && AM.BaseOffs != 0)
     return false;
 
   // PPC allows a sign-extended 16-bit immediate field.
   if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
     return false;
 
   // No global is ever allowed as a base.
   if (AM.BaseGV)
     return false;
 
   // PPC only support r+r,
   switch (AM.Scale) {
   case 0:  // "r+i" or just "i", depending on HasBaseReg.
     break;
   case 1:
     if (AM.HasBaseReg && AM.BaseOffs)  // "r+r+i" is not allowed.
       return false;
     // Otherwise we have r+r or r+i.
     break;
   case 2:
     if (AM.HasBaseReg || AM.BaseOffs)  // 2*r+r  or  2*r+i is not allowed.
       return false;
     // Allow 2*r as r+r.
     break;
   default:
     // No other scales are supported.
     return false;
   }
 
   return true;
 }
 
 SDValue PPCTargetLowering::LowerRETURNADDR(SDValue Op,
                                            SelectionDAG &DAG) const {
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   MFI.setReturnAddressIsTaken(true);
 
   if (verifyReturnAddressArgumentIsConstant(Op, DAG))
     return SDValue();
 
   SDLoc dl(Op);
   unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
 
   // Make sure the function does not optimize away the store of the RA to
   // the stack.
   PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
   FuncInfo->setLRStoreRequired();
   bool isPPC64 = Subtarget.isPPC64();
   auto PtrVT = getPointerTy(MF.getDataLayout());
 
   if (Depth > 0) {
     SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
     SDValue Offset =
         DAG.getConstant(Subtarget.getFrameLowering()->getReturnSaveOffset(), dl,
                         isPPC64 ? MVT::i64 : MVT::i32);
     return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
                        DAG.getNode(ISD::ADD, dl, PtrVT, FrameAddr, Offset),
                        MachinePointerInfo());
   }
 
   // Just load the return address off the stack.
   SDValue RetAddrFI = getReturnAddrFrameIndex(DAG);
   return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), RetAddrFI,
                      MachinePointerInfo());
 }
 
 SDValue PPCTargetLowering::LowerFRAMEADDR(SDValue Op,
                                           SelectionDAG &DAG) const {
   SDLoc dl(Op);
   unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
 
   MachineFunction &MF = DAG.getMachineFunction();
   MachineFrameInfo &MFI = MF.getFrameInfo();
   MFI.setFrameAddressIsTaken(true);
 
   EVT PtrVT = getPointerTy(MF.getDataLayout());
   bool isPPC64 = PtrVT == MVT::i64;
 
   // Naked functions never have a frame pointer, and so we use r1. For all
   // other functions, this decision must be delayed until during PEI.
   unsigned FrameReg;
   if (MF.getFunction().hasFnAttribute(Attribute::Naked))
     FrameReg = isPPC64 ? PPC::X1 : PPC::R1;
   else
     FrameReg = isPPC64 ? PPC::FP8 : PPC::FP;
 
   SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg,
                                          PtrVT);
   while (Depth--)
     FrameAddr = DAG.getLoad(Op.getValueType(), dl, DAG.getEntryNode(),
                             FrameAddr, MachinePointerInfo());
   return FrameAddr;
 }
 
 // FIXME? Maybe this could be a TableGen attribute on some registers and
 // this table could be generated automatically from RegInfo.
 Register PPCTargetLowering::getRegisterByName(const char* RegName, LLT VT,
                                               const MachineFunction &MF) const {
   bool isPPC64 = Subtarget.isPPC64();
   bool IsDarwinABI = Subtarget.isDarwinABI();
 
   bool is64Bit = isPPC64 && VT == LLT::scalar(64);
   if (!is64Bit && VT != LLT::scalar(32))
     report_fatal_error("Invalid register global variable type");
 
   Register Reg = StringSwitch<Register>(RegName)
                    .Case("r1", is64Bit ? PPC::X1 : PPC::R1)
                    .Case("r2", (IsDarwinABI || isPPC64) ? Register() : PPC::R2)
                    .Case("r13", (!isPPC64 && IsDarwinABI) ? Register() :
                                   (is64Bit ? PPC::X13 : PPC::R13))
                    .Default(Register());
 
   if (Reg)
     return Reg;
   report_fatal_error("Invalid register name global variable");
 }
 
 bool PPCTargetLowering::isAccessedAsGotIndirect(SDValue GA) const {
   // 32-bit SVR4 ABI access everything as got-indirect.
   if (Subtarget.is32BitELFABI())
     return true;
 
   // AIX accesses everything indirectly through the TOC, which is similar to
   // the GOT.
   if (Subtarget.isAIXABI())
     return true;
 
   CodeModel::Model CModel = getTargetMachine().getCodeModel();
   // If it is small or large code model, module locals are accessed
   // indirectly by loading their address from .toc/.got.
   if (CModel == CodeModel::Small || CModel == CodeModel::Large)
     return true;
 
   // JumpTable and BlockAddress are accessed as got-indirect.
   if (isa<JumpTableSDNode>(GA) || isa<BlockAddressSDNode>(GA))
     return true;
 
   if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(GA))
     return Subtarget.isGVIndirectSymbol(G->getGlobal());
 
   return false;
 }
 
 bool
 PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
   // The PowerPC target isn't yet aware of offsets.
   return false;
 }
 
 bool PPCTargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
                                            const CallInst &I,
                                            MachineFunction &MF,
                                            unsigned Intrinsic) const {
   switch (Intrinsic) {
   case Intrinsic::ppc_qpx_qvlfd:
   case Intrinsic::ppc_qpx_qvlfs:
   case Intrinsic::ppc_qpx_qvlfcd:
   case Intrinsic::ppc_qpx_qvlfcs:
   case Intrinsic::ppc_qpx_qvlfiwa:
   case Intrinsic::ppc_qpx_qvlfiwz:
   case Intrinsic::ppc_altivec_lvx:
   case Intrinsic::ppc_altivec_lvxl:
   case Intrinsic::ppc_altivec_lvebx:
   case Intrinsic::ppc_altivec_lvehx:
   case Intrinsic::ppc_altivec_lvewx:
   case Intrinsic::ppc_vsx_lxvd2x:
   case Intrinsic::ppc_vsx_lxvw4x: {
     EVT VT;
     switch (Intrinsic) {
     case Intrinsic::ppc_altivec_lvebx:
       VT = MVT::i8;
       break;
     case Intrinsic::ppc_altivec_lvehx:
       VT = MVT::i16;
       break;
     case Intrinsic::ppc_altivec_lvewx:
       VT = MVT::i32;
       break;
     case Intrinsic::ppc_vsx_lxvd2x:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvlfd:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvlfs:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvlfcd:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvlfcs:
       VT = MVT::v2f32;
       break;
     default:
       VT = MVT::v4i32;
       break;
     }
 
     Info.opc = ISD::INTRINSIC_W_CHAIN;
     Info.memVT = VT;
     Info.ptrVal = I.getArgOperand(0);
     Info.offset = -VT.getStoreSize()+1;
     Info.size = 2*VT.getStoreSize()-1;
     Info.align = Align::None();
     Info.flags = MachineMemOperand::MOLoad;
     return true;
   }
   case Intrinsic::ppc_qpx_qvlfda:
   case Intrinsic::ppc_qpx_qvlfsa:
   case Intrinsic::ppc_qpx_qvlfcda:
   case Intrinsic::ppc_qpx_qvlfcsa:
   case Intrinsic::ppc_qpx_qvlfiwaa:
   case Intrinsic::ppc_qpx_qvlfiwza: {
     EVT VT;
     switch (Intrinsic) {
     case Intrinsic::ppc_qpx_qvlfda:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvlfsa:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvlfcda:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvlfcsa:
       VT = MVT::v2f32;
       break;
     default:
       VT = MVT::v4i32;
       break;
     }
 
     Info.opc = ISD::INTRINSIC_W_CHAIN;
     Info.memVT = VT;
     Info.ptrVal = I.getArgOperand(0);
     Info.offset = 0;
     Info.size = VT.getStoreSize();
     Info.align = Align::None();
     Info.flags = MachineMemOperand::MOLoad;
     return true;
   }
   case Intrinsic::ppc_qpx_qvstfd:
   case Intrinsic::ppc_qpx_qvstfs:
   case Intrinsic::ppc_qpx_qvstfcd:
   case Intrinsic::ppc_qpx_qvstfcs:
   case Intrinsic::ppc_qpx_qvstfiw:
   case Intrinsic::ppc_altivec_stvx:
   case Intrinsic::ppc_altivec_stvxl:
   case Intrinsic::ppc_altivec_stvebx:
   case Intrinsic::ppc_altivec_stvehx:
   case Intrinsic::ppc_altivec_stvewx:
   case Intrinsic::ppc_vsx_stxvd2x:
   case Intrinsic::ppc_vsx_stxvw4x: {
     EVT VT;
     switch (Intrinsic) {
     case Intrinsic::ppc_altivec_stvebx:
       VT = MVT::i8;
       break;
     case Intrinsic::ppc_altivec_stvehx:
       VT = MVT::i16;
       break;
     case Intrinsic::ppc_altivec_stvewx:
       VT = MVT::i32;
       break;
     case Intrinsic::ppc_vsx_stxvd2x:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvstfd:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvstfs:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvstfcd:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvstfcs:
       VT = MVT::v2f32;
       break;
     default:
       VT = MVT::v4i32;
       break;
     }
 
     Info.opc = ISD::INTRINSIC_VOID;
     Info.memVT = VT;
     Info.ptrVal = I.getArgOperand(1);
     Info.offset = -VT.getStoreSize()+1;
     Info.size = 2*VT.getStoreSize()-1;
     Info.align = Align::None();
     Info.flags = MachineMemOperand::MOStore;
     return true;
   }
   case Intrinsic::ppc_qpx_qvstfda:
   case Intrinsic::ppc_qpx_qvstfsa:
   case Intrinsic::ppc_qpx_qvstfcda:
   case Intrinsic::ppc_qpx_qvstfcsa:
   case Intrinsic::ppc_qpx_qvstfiwa: {
     EVT VT;
     switch (Intrinsic) {
     case Intrinsic::ppc_qpx_qvstfda:
       VT = MVT::v4f64;
       break;
     case Intrinsic::ppc_qpx_qvstfsa:
       VT = MVT::v4f32;
       break;
     case Intrinsic::ppc_qpx_qvstfcda:
       VT = MVT::v2f64;
       break;
     case Intrinsic::ppc_qpx_qvstfcsa:
       VT = MVT::v2f32;
       break;
     default:
       VT = MVT::v4i32;
       break;
     }
 
     Info.opc = ISD::INTRINSIC_VOID;
     Info.memVT = VT;
     Info.ptrVal = I.getArgOperand(1);
     Info.offset = 0;
     Info.size = VT.getStoreSize();
     Info.align = Align::None();
     Info.flags = MachineMemOperand::MOStore;
     return true;
   }
   default:
     break;
   }
 
   return false;
 }
 
 /// getOptimalMemOpType - Returns the target specific optimal type for load
 /// and store operations as a result of memset, memcpy, and memmove
 /// lowering. If DstAlign is zero that means it's safe to destination
 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
 /// means there isn't a need to check it against alignment requirement,
 /// probably because the source does not need to be loaded. If 'IsMemset' is
 /// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
 /// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
 /// source is constant so it does not need to be loaded.
 /// It returns EVT::Other if the type should be determined using generic
 /// target-independent logic.
 EVT PPCTargetLowering::getOptimalMemOpType(
     uint64_t Size, unsigned DstAlign, unsigned SrcAlign, bool IsMemset,
     bool ZeroMemset, bool MemcpyStrSrc,
     const AttributeList &FuncAttributes) const {
   if (getTargetMachine().getOptLevel() != CodeGenOpt::None) {
     // When expanding a memset, require at least two QPX instructions to cover
     // the cost of loading the value to be stored from the constant pool.
     if (Subtarget.hasQPX() && Size >= 32 && (!IsMemset || Size >= 64) &&
        (!SrcAlign || SrcAlign >= 32) && (!DstAlign || DstAlign >= 32) &&
         !FuncAttributes.hasFnAttribute(Attribute::NoImplicitFloat)) {
       return MVT::v4f64;
     }
 
     // We should use Altivec/VSX loads and stores when available. For unaligned
     // addresses, unaligned VSX loads are only fast starting with the P8.
     if (Subtarget.hasAltivec() && Size >= 16 &&
         (((!SrcAlign || SrcAlign >= 16) && (!DstAlign || DstAlign >= 16)) ||
          ((IsMemset && Subtarget.hasVSX()) || Subtarget.hasP8Vector())))
       return MVT::v4i32;
   }
 
   if (Subtarget.isPPC64()) {
     return MVT::i64;
   }
 
   return MVT::i32;
 }
 
 /// Returns true if it is beneficial to convert a load of a constant
 /// to just the constant itself.
 bool PPCTargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
                                                           Type *Ty) const {
   assert(Ty->isIntegerTy());
 
   unsigned BitSize = Ty->getPrimitiveSizeInBits();
   return !(BitSize == 0 || BitSize > 64);
 }
 
 bool PPCTargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
   if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
     return false;
   unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
   unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
   return NumBits1 == 64 && NumBits2 == 32;
 }
 
 bool PPCTargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
   if (!VT1.isInteger() || !VT2.isInteger())
     return false;
   unsigned NumBits1 = VT1.getSizeInBits();
   unsigned NumBits2 = VT2.getSizeInBits();
   return NumBits1 == 64 && NumBits2 == 32;
 }
 
 bool PPCTargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
   // Generally speaking, zexts are not free, but they are free when they can be
   // folded with other operations.
   if (LoadSDNode *LD = dyn_cast<LoadSDNode>(Val)) {
     EVT MemVT = LD->getMemoryVT();
     if ((MemVT == MVT::i1 || MemVT == MVT::i8 || MemVT == MVT::i16 ||
          (Subtarget.isPPC64() && MemVT == MVT::i32)) &&
         (LD->getExtensionType() == ISD::NON_EXTLOAD ||
          LD->getExtensionType() == ISD::ZEXTLOAD))
       return true;
   }
 
   // FIXME: Add other cases...
   //  - 32-bit shifts with a zext to i64
   //  - zext after ctlz, bswap, etc.
   //  - zext after and by a constant mask
 
   return TargetLowering::isZExtFree(Val, VT2);
 }
 
 bool PPCTargetLowering::isFPExtFree(EVT DestVT, EVT SrcVT) const {
   assert(DestVT.isFloatingPoint() && SrcVT.isFloatingPoint() &&
          "invalid fpext types");
   // Extending to float128 is not free.
   if (DestVT == MVT::f128)
     return false;
   return true;
 }
 
 bool PPCTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
   return isInt<16>(Imm) || isUInt<16>(Imm);
 }
 
 bool PPCTargetLowering::isLegalAddImmediate(int64_t Imm) const {
   return isInt<16>(Imm) || isUInt<16>(Imm);
 }
 
 bool PPCTargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
                                                        unsigned,
                                                        unsigned,
                                                        MachineMemOperand::Flags,
                                                        bool *Fast) const {
   if (DisablePPCUnaligned)
     return false;
 
   // PowerPC supports unaligned memory access for simple non-vector types.
   // Although accessing unaligned addresses is not as efficient as accessing
   // aligned addresses, it is generally more efficient than manual expansion,
   // and generally only traps for software emulation when crossing page
   // boundaries.
 
   if (!VT.isSimple())
     return false;
 
   if (VT.getSimpleVT().isVector()) {
     if (Subtarget.hasVSX()) {
       if (VT != MVT::v2f64 && VT != MVT::v2i64 &&
           VT != MVT::v4f32 && VT != MVT::v4i32)
         return false;
     } else {
       return false;
     }
   }
 
   if (VT == MVT::ppcf128)
     return false;
 
   if (Fast)
     *Fast = true;
 
   return true;
 }
 
 bool PPCTargetLowering::isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
                                                    EVT VT) const {
   VT = VT.getScalarType();
 
   if (!VT.isSimple())
     return false;
 
   switch (VT.getSimpleVT().SimpleTy) {
   case MVT::f32:
   case MVT::f64:
     return true;
   case MVT::f128:
     return (EnableQuadPrecision && Subtarget.hasP9Vector());
   default:
     break;
   }
 
   return false;
 }
 
 const MCPhysReg *
 PPCTargetLowering::getScratchRegisters(CallingConv::ID) const {
   // LR is a callee-save register, but we must treat it as clobbered by any call
   // site. Hence we include LR in the scratch registers, which are in turn added
   // as implicit-defs for stackmaps and patchpoints. The same reasoning applies
   // to CTR, which is used by any indirect call.
   static const MCPhysReg ScratchRegs[] = {
     PPC::X12, PPC::LR8, PPC::CTR8, 0
   };
 
   return ScratchRegs;
 }
 
 unsigned PPCTargetLowering::getExceptionPointerRegister(
     const Constant *PersonalityFn) const {
   return Subtarget.isPPC64() ? PPC::X3 : PPC::R3;
 }
 
 unsigned PPCTargetLowering::getExceptionSelectorRegister(
     const Constant *PersonalityFn) const {
   return Subtarget.isPPC64() ? PPC::X4 : PPC::R4;
 }
 
 bool
 PPCTargetLowering::shouldExpandBuildVectorWithShuffles(
                      EVT VT , unsigned DefinedValues) const {
   if (VT == MVT::v2i64)
     return Subtarget.hasDirectMove(); // Don't need stack ops with direct moves
 
   if (Subtarget.hasVSX() || Subtarget.hasQPX())
     return true;
 
   return TargetLowering::shouldExpandBuildVectorWithShuffles(VT, DefinedValues);
 }
 
 Sched::Preference PPCTargetLowering::getSchedulingPreference(SDNode *N) const {
   if (DisableILPPref || Subtarget.enableMachineScheduler())
     return TargetLowering::getSchedulingPreference(N);
 
   return Sched::ILP;
 }
 
 // Create a fast isel object.
 FastISel *
 PPCTargetLowering::createFastISel(FunctionLoweringInfo &FuncInfo,
                                   const TargetLibraryInfo *LibInfo) const {
   return PPC::createFastISel(FuncInfo, LibInfo);
 }
 
 void PPCTargetLowering::initializeSplitCSR(MachineBasicBlock *Entry) const {
   if (Subtarget.isDarwinABI()) return;
   if (!Subtarget.isPPC64()) return;
 
   // Update IsSplitCSR in PPCFunctionInfo
   PPCFunctionInfo *PFI = Entry->getParent()->getInfo<PPCFunctionInfo>();
   PFI->setIsSplitCSR(true);
 }
 
 void PPCTargetLowering::insertCopiesSplitCSR(
   MachineBasicBlock *Entry,
   const SmallVectorImpl<MachineBasicBlock *> &Exits) const {
   const PPCRegisterInfo *TRI = Subtarget.getRegisterInfo();
   const MCPhysReg *IStart = TRI->getCalleeSavedRegsViaCopy(Entry->getParent());
   if (!IStart)
     return;
 
   const TargetInstrInfo *TII = Subtarget.getInstrInfo();
   MachineRegisterInfo *MRI = &Entry->getParent()->getRegInfo();
   MachineBasicBlock::iterator MBBI = Entry->begin();
   for (const MCPhysReg *I = IStart; *I; ++I) {
     const TargetRegisterClass *RC = nullptr;
     if (PPC::G8RCRegClass.contains(*I))
       RC = &PPC::G8RCRegClass;
     else if (PPC::F8RCRegClass.contains(*I))
       RC = &PPC::F8RCRegClass;
     else if (PPC::CRRCRegClass.contains(*I))
       RC = &PPC::CRRCRegClass;
     else if (PPC::VRRCRegClass.contains(*I))
       RC = &PPC::VRRCRegClass;
     else
       llvm_unreachable("Unexpected register class in CSRsViaCopy!");
 
     Register NewVR = MRI->createVirtualRegister(RC);
     // Create copy from CSR to a virtual register.
     // FIXME: this currently does not emit CFI pseudo-instructions, it works
     // fine for CXX_FAST_TLS since the C++-style TLS access functions should be
     // nounwind. If we want to generalize this later, we may need to emit
     // CFI pseudo-instructions.
     assert(Entry->getParent()->getFunction().hasFnAttribute(
              Attribute::NoUnwind) &&
            "Function should be nounwind in insertCopiesSplitCSR!");
     Entry->addLiveIn(*I);
     BuildMI(*Entry, MBBI, DebugLoc(), TII->get(TargetOpcode::COPY), NewVR)
       .addReg(*I);
 
     // Insert the copy-back instructions right before the terminator.
     for (auto *Exit : Exits)
       BuildMI(*Exit, Exit->getFirstTerminator(), DebugLoc(),
               TII->get(TargetOpcode::COPY), *I)
         .addReg(NewVR);
   }
 }
 
 // Override to enable LOAD_STACK_GUARD lowering on Linux.
 bool PPCTargetLowering::useLoadStackGuardNode() const {
   if (!Subtarget.isTargetLinux())
     return TargetLowering::useLoadStackGuardNode();
   return true;
 }
 
 // Override to disable global variable loading on Linux.
 void PPCTargetLowering::insertSSPDeclarations(Module &M) const {
   if (!Subtarget.isTargetLinux())
     return TargetLowering::insertSSPDeclarations(M);
 }
 
 bool PPCTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT,
                                      bool ForCodeSize) const {
   if (!VT.isSimple() || !Subtarget.hasVSX())
     return false;
 
   switch(VT.getSimpleVT().SimpleTy) {
   default:
     // For FP types that are currently not supported by PPC backend, return
     // false. Examples: f16, f80.
     return false;
   case MVT::f32:
   case MVT::f64:
   case MVT::ppcf128:
     return Imm.isPosZero();
   }
 }
 
 // For vector shift operation op, fold
 // (op x, (and y, ((1 << numbits(x)) - 1))) -> (target op x, y)
 static SDValue stripModuloOnShift(const TargetLowering &TLI, SDNode *N,
                                   SelectionDAG &DAG) {
   SDValue N0 = N->getOperand(0);
   SDValue N1 = N->getOperand(1);
   EVT VT = N0.getValueType();
   unsigned OpSizeInBits = VT.getScalarSizeInBits();
   unsigned Opcode = N->getOpcode();
   unsigned TargetOpcode;
 
   switch (Opcode) {
   default:
     llvm_unreachable("Unexpected shift operation");
   case ISD::SHL:
     TargetOpcode = PPCISD::SHL;
     break;
   case ISD::SRL:
     TargetOpcode = PPCISD::SRL;
     break;
   case ISD::SRA:
     TargetOpcode = PPCISD::SRA;
     break;
   }
 
   if (VT.isVector() && TLI.isOperationLegal(Opcode, VT) &&
       N1->getOpcode() == ISD::AND)
     if (ConstantSDNode *Mask = isConstOrConstSplat(N1->getOperand(1)))
       if (Mask->getZExtValue() == OpSizeInBits - 1)
         return DAG.getNode(TargetOpcode, SDLoc(N), VT, N0, N1->getOperand(0));
 
   return SDValue();
 }
 
 SDValue PPCTargetLowering::combineSHL(SDNode *N, DAGCombinerInfo &DCI) const {
   if (auto Value = stripModuloOnShift(*this, N, DCI.DAG))
     return Value;
 
   SDValue N0 = N->getOperand(0);
   ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(N->getOperand(1));
   if (!Subtarget.isISA3_0() ||
       N0.getOpcode() != ISD::SIGN_EXTEND ||
       N0.getOperand(0).getValueType() != MVT::i32 ||
       CN1 == nullptr || N->getValueType(0) != MVT::i64)
     return SDValue();
 
   // We can't save an operation here if the value is already extended, and
   // the existing shift is easier to combine.
   SDValue ExtsSrc = N0.getOperand(0);
   if (ExtsSrc.getOpcode() == ISD::TRUNCATE &&
       ExtsSrc.getOperand(0).getOpcode() == ISD::AssertSext)
     return SDValue();
 
   SDLoc DL(N0);
   SDValue ShiftBy = SDValue(CN1, 0);
   // We want the shift amount to be i32 on the extswli, but the shift could
   // have an i64.
   if (ShiftBy.getValueType() == MVT::i64)
     ShiftBy = DCI.DAG.getConstant(CN1->getZExtValue(), DL, MVT::i32);
 
   return DCI.DAG.getNode(PPCISD::EXTSWSLI, DL, MVT::i64, N0->getOperand(0),
                          ShiftBy);
 }
 
 SDValue PPCTargetLowering::combineSRA(SDNode *N, DAGCombinerInfo &DCI) const {
   if (auto Value = stripModuloOnShift(*this, N, DCI.DAG))
     return Value;
 
   return SDValue();
 }
 
 SDValue PPCTargetLowering::combineSRL(SDNode *N, DAGCombinerInfo &DCI) const {
   if (auto Value = stripModuloOnShift(*this, N, DCI.DAG))
     return Value;
 
   return SDValue();
 }
 
 // Transform (add X, (zext(setne Z, C))) -> (addze X, (addic (addi Z, -C), -1))
 // Transform (add X, (zext(sete  Z, C))) -> (addze X, (subfic (addi Z, -C), 0))
 // When C is zero, the equation (addi Z, -C) can be simplified to Z
 // Requirement: -C in [-32768, 32767], X and Z are MVT::i64 types
 static SDValue combineADDToADDZE(SDNode *N, SelectionDAG &DAG,
                                  const PPCSubtarget &Subtarget) {
   if (!Subtarget.isPPC64())
     return SDValue();
 
   SDValue LHS = N->getOperand(0);
   SDValue RHS = N->getOperand(1);
 
   auto isZextOfCompareWithConstant = [](SDValue Op) {
     if (Op.getOpcode() != ISD::ZERO_EXTEND || !Op.hasOneUse() ||
         Op.getValueType() != MVT::i64)
       return false;
 
     SDValue Cmp = Op.getOperand(0);
     if (Cmp.getOpcode() != ISD::SETCC || !Cmp.hasOneUse() ||
         Cmp.getOperand(0).getValueType() != MVT::i64)
       return false;
 
     if (auto *Constant = dyn_cast<ConstantSDNode>(Cmp.getOperand(1))) {
       int64_t NegConstant = 0 - Constant->getSExtValue();
       // Due to the limitations of the addi instruction,
       // -C is required to be [-32768, 32767].
       return isInt<16>(NegConstant);
     }
 
     return false;
   };
 
   bool LHSHasPattern = isZextOfCompareWithConstant(LHS);
   bool RHSHasPattern = isZextOfCompareWithConstant(RHS);
 
   // If there is a pattern, canonicalize a zext operand to the RHS.
   if (LHSHasPattern && !RHSHasPattern)
     std::swap(LHS, RHS);
   else if (!LHSHasPattern && !RHSHasPattern)
     return SDValue();
 
   SDLoc DL(N);
   SDVTList VTs = DAG.getVTList(MVT::i64, MVT::Glue);
   SDValue Cmp = RHS.getOperand(0);
   SDValue Z = Cmp.getOperand(0);
   auto *Constant = dyn_cast<ConstantSDNode>(Cmp.getOperand(1));
 
   assert(Constant && "Constant Should not be a null pointer.");
   int64_t NegConstant = 0 - Constant->getSExtValue();
 
   switch(cast<CondCodeSDNode>(Cmp.getOperand(2))->get()) {
   default: break;
   case ISD::SETNE: {
     //                                 when C == 0
     //                             --> addze X, (addic Z, -1).carry
     //                            /
     // add X, (zext(setne Z, C))--
     //                            \    when -32768 <= -C <= 32767 && C != 0
     //                             --> addze X, (addic (addi Z, -C), -1).carry
     SDValue Add = DAG.getNode(ISD::ADD, DL, MVT::i64, Z,
                               DAG.getConstant(NegConstant, DL, MVT::i64));
     SDValue AddOrZ = NegConstant != 0 ? Add : Z;
     SDValue Addc = DAG.getNode(ISD::ADDC, DL, DAG.getVTList(MVT::i64, MVT::Glue),
                                AddOrZ, DAG.getConstant(-1ULL, DL, MVT::i64));
     return DAG.getNode(ISD::ADDE, DL, VTs, LHS, DAG.getConstant(0, DL, MVT::i64),
                        SDValue(Addc.getNode(), 1));
     }
   case ISD::SETEQ: {
     //                                 when C == 0
     //                             --> addze X, (subfic Z, 0).carry
     //                            /
     // add X, (zext(sete  Z, C))--
     //                            \    when -32768 <= -C <= 32767 && C != 0
     //                             --> addze X, (subfic (addi Z, -C), 0).carry
     SDValue Add = DAG.getNode(ISD::ADD, DL, MVT::i64, Z,
                               DAG.getConstant(NegConstant, DL, MVT::i64));
     SDValue AddOrZ = NegConstant != 0 ? Add : Z;
     SDValue Subc = DAG.getNode(ISD::SUBC, DL, DAG.getVTList(MVT::i64, MVT::Glue),
                                DAG.getConstant(0, DL, MVT::i64), AddOrZ);
     return DAG.getNode(ISD::ADDE, DL, VTs, LHS, DAG.getConstant(0, DL, MVT::i64),
                        SDValue(Subc.getNode(), 1));
     }
   }
 
   return SDValue();
 }
 
 SDValue PPCTargetLowering::combineADD(SDNode *N, DAGCombinerInfo &DCI) const {
   if (auto Value = combineADDToADDZE(N, DCI.DAG, Subtarget))
     return Value;
 
   return SDValue();
 }
 
 // Detect TRUNCATE operations on bitcasts of float128 values.
 // What we are looking for here is the situtation where we extract a subset
 // of bits from a 128 bit float.
 // This can be of two forms:
 // 1) BITCAST of f128 feeding TRUNCATE
 // 2) BITCAST of f128 feeding SRL (a shift) feeding TRUNCATE
 // The reason this is required is because we do not have a legal i128 type
 // and so we want to prevent having to store the f128 and then reload part
 // of it.
 SDValue PPCTargetLowering::combineTRUNCATE(SDNode *N,
                                            DAGCombinerInfo &DCI) const {
   // If we are using CRBits then try that first.
   if (Subtarget.useCRBits()) {
     // Check if CRBits did anything and return that if it did.
     if (SDValue CRTruncValue = DAGCombineTruncBoolExt(N, DCI))
       return CRTruncValue;
   }
 
   SDLoc dl(N);
   SDValue Op0 = N->getOperand(0);
 
   // Looking for a truncate of i128 to i64.
   if (Op0.getValueType() != MVT::i128 || N->getValueType(0) != MVT::i64)
     return SDValue();
 
   int EltToExtract = DCI.DAG.getDataLayout().isBigEndian() ? 1 : 0;
 
   // SRL feeding TRUNCATE.
   if (Op0.getOpcode() == ISD::SRL) {
     ConstantSDNode *ConstNode = dyn_cast<ConstantSDNode>(Op0.getOperand(1));
     // The right shift has to be by 64 bits.
     if (!ConstNode || ConstNode->getZExtValue() != 64)
       return SDValue();
 
     // Switch the element number to extract.
     EltToExtract = EltToExtract ? 0 : 1;
     // Update Op0 past the SRL.
     Op0 = Op0.getOperand(0);
   }
 
   // BITCAST feeding a TRUNCATE possibly via SRL.
   if (Op0.getOpcode() == ISD::BITCAST &&
       Op0.getValueType() == MVT::i128 &&
       Op0.getOperand(0).getValueType() == MVT::f128) {
     SDValue Bitcast = DCI.DAG.getBitcast(MVT::v2i64, Op0.getOperand(0));
     return DCI.DAG.getNode(
         ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Bitcast,
         DCI.DAG.getTargetConstant(EltToExtract, dl, MVT::i32));
   }
   return SDValue();
 }
 
 SDValue PPCTargetLowering::combineMUL(SDNode *N, DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
 
   ConstantSDNode *ConstOpOrElement = isConstOrConstSplat(N->getOperand(1));
   if (!ConstOpOrElement)
     return SDValue();
 
   // An imul is usually smaller than the alternative sequence for legal type.
   if (DAG.getMachineFunction().getFunction().hasMinSize() &&
       isOperationLegal(ISD::MUL, N->getValueType(0)))
     return SDValue();
 
   auto IsProfitable = [this](bool IsNeg, bool IsAddOne, EVT VT) -> bool {
     switch (this->Subtarget.getCPUDirective()) {
     default:
       // TODO: enhance the condition for subtarget before pwr8
       return false;
     case PPC::DIR_PWR8:
       //  type        mul     add    shl
       // scalar        4       1      1
       // vector        7       2      2
       return true;
     case PPC::DIR_PWR9:
     case PPC::DIR_PWR_FUTURE:
       //  type        mul     add    shl
       // scalar        5       2      2
       // vector        7       2      2
 
       // The cycle RATIO of related operations are showed as a table above.
       // Because mul is 5(scalar)/7(vector), add/sub/shl are all 2 for both
       // scalar and vector type. For 2 instrs patterns, add/sub + shl
       // are 4, it is always profitable; but for 3 instrs patterns
       // (mul x, -(2^N + 1)) => -(add (shl x, N), x), sub + add + shl are 6.
       // So we should only do it for vector type.
       return IsAddOne && IsNeg ? VT.isVector() : true;
     }
   };
 
   EVT VT = N->getValueType(0);
   SDLoc DL(N);
 
   const APInt &MulAmt = ConstOpOrElement->getAPIntValue();
   bool IsNeg = MulAmt.isNegative();
   APInt MulAmtAbs = MulAmt.abs();
 
   if ((MulAmtAbs - 1).isPowerOf2()) {
     // (mul x, 2^N + 1) => (add (shl x, N), x)
     // (mul x, -(2^N + 1)) => -(add (shl x, N), x)
 
     if (!IsProfitable(IsNeg, true, VT))
       return SDValue();
 
     SDValue Op0 = N->getOperand(0);
     SDValue Op1 =
         DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
                     DAG.getConstant((MulAmtAbs - 1).logBase2(), DL, VT));
     SDValue Res = DAG.getNode(ISD::ADD, DL, VT, Op0, Op1);
 
     if (!IsNeg)
       return Res;
 
     return DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, DL, VT), Res);
   } else if ((MulAmtAbs + 1).isPowerOf2()) {
     // (mul x, 2^N - 1) => (sub (shl x, N), x)
     // (mul x, -(2^N - 1)) => (sub x, (shl x, N))
 
     if (!IsProfitable(IsNeg, false, VT))
       return SDValue();
 
     SDValue Op0 = N->getOperand(0);
     SDValue Op1 =
         DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
                     DAG.getConstant((MulAmtAbs + 1).logBase2(), DL, VT));
 
     if (!IsNeg)
       return DAG.getNode(ISD::SUB, DL, VT, Op1, Op0);
     else
       return DAG.getNode(ISD::SUB, DL, VT, Op0, Op1);
 
   } else {
     return SDValue();
   }
 }
 
 bool PPCTargetLowering::mayBeEmittedAsTailCall(const CallInst *CI) const {
   // Only duplicate to increase tail-calls for the 64bit SysV ABIs.
   if (!Subtarget.is64BitELFABI())
     return false;
 
   // If not a tail call then no need to proceed.
   if (!CI->isTailCall())
     return false;
 
   // If sibling calls have been disabled and tail-calls aren't guaranteed
   // there is no reason to duplicate.
   auto &TM = getTargetMachine();
   if (!TM.Options.GuaranteedTailCallOpt && DisableSCO)
     return false;
 
   // Can't tail call a function called indirectly, or if it has variadic args.
   const Function *Callee = CI->getCalledFunction();
   if (!Callee || Callee->isVarArg())
     return false;
 
   // Make sure the callee and caller calling conventions are eligible for tco.
   const Function *Caller = CI->getParent()->getParent();
   if (!areCallingConvEligibleForTCO_64SVR4(Caller->getCallingConv(),
                                            CI->getCallingConv()))
       return false;
 
   // If the function is local then we have a good chance at tail-calling it
   return getTargetMachine().shouldAssumeDSOLocal(*Caller->getParent(), Callee);
 }
 
 bool PPCTargetLowering::hasBitPreservingFPLogic(EVT VT) const {
   if (!Subtarget.hasVSX())
     return false;
   if (Subtarget.hasP9Vector() && VT == MVT::f128)
     return true;
   return VT == MVT::f32 || VT == MVT::f64 ||
     VT == MVT::v4f32 || VT == MVT::v2f64;
 }
 
 bool PPCTargetLowering::
 isMaskAndCmp0FoldingBeneficial(const Instruction &AndI) const {
   const Value *Mask = AndI.getOperand(1);
   // If the mask is suitable for andi. or andis. we should sink the and.
   if (const ConstantInt *CI = dyn_cast<ConstantInt>(Mask)) {
     // Can't handle constants wider than 64-bits.
     if (CI->getBitWidth() > 64)
       return false;
     int64_t ConstVal = CI->getZExtValue();
     return isUInt<16>(ConstVal) ||
       (isUInt<16>(ConstVal >> 16) && !(ConstVal & 0xFFFF));
   }
 
   // For non-constant masks, we can always use the record-form and.
   return true;
 }
 
 // Transform (abs (sub (zext a), (zext b))) to (vabsd a b 0)
 // Transform (abs (sub (zext a), (zext_invec b))) to (vabsd a b 0)
 // Transform (abs (sub (zext_invec a), (zext_invec b))) to (vabsd a b 0)
 // Transform (abs (sub (zext_invec a), (zext b))) to (vabsd a b 0)
 // Transform (abs (sub a, b) to (vabsd a b 1)) if a & b of type v4i32
 SDValue PPCTargetLowering::combineABS(SDNode *N, DAGCombinerInfo &DCI) const {
   assert((N->getOpcode() == ISD::ABS) && "Need ABS node here");
   assert(Subtarget.hasP9Altivec() &&
          "Only combine this when P9 altivec supported!");
   EVT VT = N->getValueType(0);
   if (VT != MVT::v4i32 && VT != MVT::v8i16 && VT != MVT::v16i8)
     return SDValue();
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   if (N->getOperand(0).getOpcode() == ISD::SUB) {
     // Even for signed integers, if it's known to be positive (as signed
     // integer) due to zero-extended inputs.
     unsigned SubOpcd0 = N->getOperand(0)->getOperand(0).getOpcode();
     unsigned SubOpcd1 = N->getOperand(0)->getOperand(1).getOpcode();
     if ((SubOpcd0 == ISD::ZERO_EXTEND ||
          SubOpcd0 == ISD::ZERO_EXTEND_VECTOR_INREG) &&
         (SubOpcd1 == ISD::ZERO_EXTEND ||
          SubOpcd1 == ISD::ZERO_EXTEND_VECTOR_INREG)) {
       return DAG.getNode(PPCISD::VABSD, dl, N->getOperand(0).getValueType(),
                          N->getOperand(0)->getOperand(0),
                          N->getOperand(0)->getOperand(1),
                          DAG.getTargetConstant(0, dl, MVT::i32));
     }
 
     // For type v4i32, it can be optimized with xvnegsp + vabsduw
     if (N->getOperand(0).getValueType() == MVT::v4i32 &&
         N->getOperand(0).hasOneUse()) {
       return DAG.getNode(PPCISD::VABSD, dl, N->getOperand(0).getValueType(),
                          N->getOperand(0)->getOperand(0),
                          N->getOperand(0)->getOperand(1),
                          DAG.getTargetConstant(1, dl, MVT::i32));
     }
   }
 
   return SDValue();
 }
 
 // For type v4i32/v8ii16/v16i8, transform
 // from (vselect (setcc a, b, setugt), (sub a, b), (sub b, a)) to (vabsd a, b)
 // from (vselect (setcc a, b, setuge), (sub a, b), (sub b, a)) to (vabsd a, b)
 // from (vselect (setcc a, b, setult), (sub b, a), (sub a, b)) to (vabsd a, b)
 // from (vselect (setcc a, b, setule), (sub b, a), (sub a, b)) to (vabsd a, b)
 SDValue PPCTargetLowering::combineVSelect(SDNode *N,
                                           DAGCombinerInfo &DCI) const {
   assert((N->getOpcode() == ISD::VSELECT) && "Need VSELECT node here");
   assert(Subtarget.hasP9Altivec() &&
          "Only combine this when P9 altivec supported!");
 
   SelectionDAG &DAG = DCI.DAG;
   SDLoc dl(N);
   SDValue Cond = N->getOperand(0);
   SDValue TrueOpnd = N->getOperand(1);
   SDValue FalseOpnd = N->getOperand(2);
   EVT VT = N->getOperand(1).getValueType();
 
   if (Cond.getOpcode() != ISD::SETCC || TrueOpnd.getOpcode() != ISD::SUB ||
       FalseOpnd.getOpcode() != ISD::SUB)
     return SDValue();
 
   // ABSD only available for type v4i32/v8i16/v16i8
   if (VT != MVT::v4i32 && VT != MVT::v8i16 && VT != MVT::v16i8)
     return SDValue();
 
   // At least to save one more dependent computation
   if (!(Cond.hasOneUse() || TrueOpnd.hasOneUse() || FalseOpnd.hasOneUse()))
     return SDValue();
 
   ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
 
   // Can only handle unsigned comparison here
   switch (CC) {
   default:
     return SDValue();
   case ISD::SETUGT:
   case ISD::SETUGE:
     break;
   case ISD::SETULT:
   case ISD::SETULE:
     std::swap(TrueOpnd, FalseOpnd);
     break;
   }
 
   SDValue CmpOpnd1 = Cond.getOperand(0);
   SDValue CmpOpnd2 = Cond.getOperand(1);
 
   // SETCC CmpOpnd1 CmpOpnd2 cond
   // TrueOpnd = CmpOpnd1 - CmpOpnd2
   // FalseOpnd = CmpOpnd2 - CmpOpnd1
   if (TrueOpnd.getOperand(0) == CmpOpnd1 &&
       TrueOpnd.getOperand(1) == CmpOpnd2 &&
       FalseOpnd.getOperand(0) == CmpOpnd2 &&
       FalseOpnd.getOperand(1) == CmpOpnd1) {
     return DAG.getNode(PPCISD::VABSD, dl, N->getOperand(1).getValueType(),
                        CmpOpnd1, CmpOpnd2,
                        DAG.getTargetConstant(0, dl, MVT::i32));
   }
 
   return SDValue();
 }