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Apply fix for LLVM PR51957 (Miscompilation in Botan's SHA3)

Description

Apply fix for LLVM PR51957 (Miscompilation in Botan's SHA3)

Merge commit e27a6db5298f from llvm git (by Jameson Nash):

Bad SLPVectorization shufflevector replacement, resulting in write to wrong memory location

We see that it might otherwise do:

  %10 = getelementptr {}**, <2 x {}***> %9, <2 x i32> <i32 10, i32 4>
  %11 = bitcast <2 x {}***> %10 to <2 x i64*>
...
  %27 = extractelement <2 x i64*> %11, i32 0
  %28 = bitcast i64* %27 to <2 x i64>*
  store <2 x i64> %22, <2 x i64>* %28, align 4, !tbaa !2

Which is an out-of-bounds store (the extractelement got offset 10
instead of offset 4 as intended). With the fix, we correctly generate
extractelement for i32 1 and generate correct code.

Differential Revision: https://reviews.llvm.org/D106613

(cherry picked from commit 397a8ba05313cc3815d219c9d1b2de1372fcb561)

Details

Provenance
dimAuthored on Nov 10 2021, 6:38 PM
Parents
rGc009c03b3731: Fix assertion when building devel/glog with new pass manager
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