revert r346588 for now
The rewrite of strcmp in assembly uses an instruction added in PowerISA 2.05, making it SIGILL on CPUs older than the POWER6, such as the PPC970 in the PowerMac G5. Revert this until we get clang+lld, or retire the in-tree binutils in favor of newer binutils with IFUNC support, whichever comes first.
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Justin Hibbits
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# $FreeBSD$
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MDSRCS+= \
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strcmp.S
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@ -1,207 +0,0 @@
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/*-
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* Copyright (c) 2018 Instituto de Pesquisas Eldorado
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#if 0
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RCSID("$NetBSD: strcmp.S,v 1.0 2018/05/10 12:33:02 alexandre Exp $")
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#endif
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/* Alignment mask. */
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#define STRCMP_MULTI_ALIGNMENT_BYTES 8
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#define STRCMP_MULTI_ALIGNMENT_MASK (STRCMP_MULTI_ALIGNMENT_BYTES - 1)
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ENTRY(strcmp)
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/* Starting alignment even if aligned, avoiding performance
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* degradation for short strings.
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*/
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lbz %r5,0(%r3) /* Load chars. */
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lbz %r6,0(%r4)
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cmpd %r5,%r6 /* Check if chars are different. */
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bne .Lstrcmp_end
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cmpdi %r5,0 /* Check if char is zero. */
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beq .Lstrcmp_end
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/* Checking if addresses can be aligned, otherwise copy by byte */
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xor %r7,%r3,%r4
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andi. %r7,%r7,STRCMP_MULTI_ALIGNMENT_MASK
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bne .Lstrcmp_compare_by_byte_loop
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.Lstrcmp_param1_align_loop:
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lbzu %r5,1(%r3) /* Load chars. */
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lbzu %r6,1(%r4)
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cmpd %r5,%r6 /* Check if chars are different. */
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bne .Lstrcmp_end
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cmpdi %r5,0 /* Check if char is zero. */
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beq .Lstrcmp_end
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andi. %r7,%r3,STRCMP_MULTI_ALIGNMENT_MASK /* Check alignment. */
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bne .Lstrcmp_param1_align_loop
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.Lstrcmp_param1_aligned:
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/* If parameter 2 is aligned compare by qword/word,
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* else compare by byte. */
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andi. %r7,%r4,STRCMP_MULTI_ALIGNMENT_MASK
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beq .Lstrcmp_compare_by_word
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lbz %r5,0(%r3) /* Load chars. */
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lbz %r6,0(%r4)
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cmpd %r5,%r6 /* Check if chars are different. */
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bne+ .Lstrcmp_end
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cmpdi %r5,0 /* Check if char is zero. */
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beq+ .Lstrcmp_end
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.Lstrcmp_compare_by_byte_loop:
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lbzu %r5,1(%r3)
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lbzu %r6,1(%r4)
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cmpdi %r5,0
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beq .Lstrcmp_end
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cmpd %r5,%r6
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beq .Lstrcmp_compare_by_byte_loop
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.Lstrcmp_end:
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_compare_by_word:
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ld %r5,0(%r3) /* Load double words. */
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ld %r6,0(%r4)
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xor %r8,%r8,%r8 /* %r8 <- Zero. */
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xor %r0,%r5,%r6 /* Check if double words are different. */
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cmpb %r7,%r5,%r8 /* Check if double words contain zero. */
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/*
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* If double words are different or contain zero,
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* find what byte is different or contains zero,
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* else load next double words.
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*/
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or. %r9,%r7,%r0
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bne .Lstrcmp_check_zeros_differences
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.Lstrcmp_compare_by_word_loop:
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ldu %r5,8(%r3) /* Load double words. */
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ldu %r6,8(%r4)
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xor %r0,%r5,%r6 /* Check if double words are different. */
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cmpb %r7,%r5,%r8 /* Check if double words contain zero. */
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/*
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* If double words are different or contain zero,
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* find what byte is different or contains zero,
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* else load next double words.
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*/
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or. %r9,%r7,%r0
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beq .Lstrcmp_compare_by_word_loop
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.Lstrcmp_check_zeros_differences:
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/* Find what byte is different or contains zero. */
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/* Check 1st byte. */
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rldicr. %r0,%r9,0,7
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bne .Lstrcmp_found_zero_difference_in_1
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/* Check 2nd byte. */
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rldicr. %r0,%r9,8,7
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bne .Lstrcmp_found_zero_difference_in_2
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/* Check 3rd byte. */
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rldicr. %r0,%r9,16,7
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bne .Lstrcmp_found_zero_difference_in_3
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/* Check 4th byte. */
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rldicr. %r0,%r9,24,7
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bne .Lstrcmp_found_zero_difference_in_4
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/* Check 5th byte. */
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andis. %r0,%r9,0xff00
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bne .Lstrcmp_found_zero_difference_in_5
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/* Check 6th byte. */
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andis. %r0,%r9,0xff
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bne .Lstrcmp_found_zero_difference_in_6
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/* Check 7th byte. */
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andi. %r0,%r9,0xff00
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bne .Lstrcmp_found_zero_difference_in_7
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.Lstrcmp_found_zero_difference_in_8:
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/* 8th byte is different or contains zero. */
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andi. %r5,%r5,0xff
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andi. %r6,%r6,0xff
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_1:
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/* 1st byte is different or contains zero. */
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lbz %r5,0(%r3)
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lbz %r6,0(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_2:
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/* 2nd byte is different or contains zero. */
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lbz %r5,1(%r3)
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lbz %r6,1(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_3:
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/* 3rd byte is different or contains zero. */
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lbz %r5,2(%r3)
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lbz %r6,2(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_4:
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/* 4th byte is different or contains zero. */
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lbz %r5,3(%r3)
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lbz %r6,3(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_5:
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/* 5th byte is different or contains zero. */
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lbz %r5,4(%r3)
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lbz %r6,4(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_6:
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/* 6th byte is different or contains zero. */
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lbz %r5,5(%r3)
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lbz %r6,5(%r4)
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sub %r3,%r5,%r6
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blr
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.Lstrcmp_found_zero_difference_in_7:
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/* 7th byte is different or contains zero. */
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lbz %r5,6(%r3)
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lbz %r6,6(%r4)
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sub %r3,%r5,%r6
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blr
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END(strcmp)
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.section .note.GNU-stack,"",%progbits
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