Differential D15368 Diff 66798 head/lib/libc/powerpc64/string/strcpy_arch_2_05.S

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head/lib/libc/powerpc64/string/strcpy_arch_2_05.S

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				/*-
				* Copyright (c) 2018 Instituto de Pesquisas Eldorado
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice, this list of conditions and the following disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				* 3. Neither the name of the author nor the names of its contributors may
				* be used to endorse or promote products derived from this software
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
				* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
				* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
				* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
				* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
				* SUCH DAMAGE.
				*/

				#if !defined(__BIG_ENDIAN__)
				#error "Optimized SRTCPY is only supported by big-endian architecture!"
				#endif

				#include <machine/asm.h>
				__FBSDID("$FreeBSD$");

				#if 0
				RCSID("$NetBSD: strcpy.S,v 1.0 2018/05/08 13:00:49 lbianc Exp $")
				#endif

				ENTRY(__strcpy_arch_2_05)
				mr %r8, %r3

				/*
				* Aligning the reading address, even if it is already aligned to avoid
				* performance degradation with strings with 8 bytes or less.
				*/
				.Lalignment:
				lbz %r0,0(%r4)
				cmpdi cr7,%r0,0
				stb %r0,0(%r8)
				beq cr7,.Lexit
				addi %r4,%r4,1
				addi %r8,%r8,1
				andi. %r0,%r4,0x7
				bne .Lalignment

				/* Copy by double word with aligned address. */
				.Lcopy_dw:
				ld %r0,0(%r4)
				xor %r6,%r6,%r6
				cmpb %r5,%r0,%r6
				cmpdi cr7,%r5,0
				bne cr7,.Lcheck_zero
				/* Backward r8 to use stdu instruction in Lcopy_dw_loop */
				addi %r8,%r8,-8
				.Lcopy_dw_loop:
				stdu %r0,8(%r8)
				ldu %r0,8(%r4)
				cmpb %r5,%r0,%r6
				cmpdi cr7,%r5,0
				beq cr7,.Lcopy_dw_loop

				addi %r8,%r8,8 /* Forward r8 to use std instruction. */
				/* Find where the zero is located. */
				.Lcheck_zero:
				rldicr. %r5,%r0,0,7
				beq .Lfound_on_byte_0
				rldicr. %r7,%r0,8,7
				beq .Lfound_on_byte_1
				rldicr. %r7,%r0,16,7
				beq .Lfound_on_byte_2
				rldicr. %r7,%r0,24,7
				beq .Lfound_on_byte_3
				andis. %r7,%r0,0xff00
				beq .Lfound_on_byte_4
				andis. %r7,%r0,0xff
				beq .Lfound_on_byte_5
				andi. %r7,%r0,0xff00
				beq .Lfound_on_byte_6

				/* Copy the last string bytes according to the string end position. */
				.Lfound_on_byte_7:
				std %r0,0(%r8)
				b .Lexit

				.Lfound_on_byte_6:
				srdi %r6,%r0,32
				stw %r6,0(%r8)
				srdi %r6,%r0,16
				sth %r6,4(%r8)
				srdi %r6,%r0,8
				stb %r6,6(%r8)
				b .Lexit

				.Lfound_on_byte_5:
				srdi %r6,%r0,32
				stw %r6,0(%r8)
				srdi %r6,%r0,16
				sth %r6,4(%r8)
				b .Lexit

				.Lfound_on_byte_4:
				srdi %r6,%r0,32
				stw %r6,0(%r8)
				srdi %r6,%r0,24
				stb %r6,4(%r8)
				b .Lexit

				.Lfound_on_byte_3:
				srdi %r6,%r0,32
				stw %r6,0(%r8)
				b .Lexit

				.Lfound_on_byte_2:
				srdi %r6,%r0,48
				sth %r6,0(%r8)
				srdi %r6,%r0,40
				stb %r6,2(%r8)
				b .Lexit

				.Lfound_on_byte_1:
				srdi %r6,%r0,48
				sth %r6,0(%r8)
				b .Lexit

				.Lfound_on_byte_0:
				srdi %r6,%r0,56
				stb %r6,0(%r8)
				.Lexit:
				blr

				END(__strcpy_arch_2_05)

				.section .note.GNU-stack,"",%progbits