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1984 lines
41 KiB
ArmAsm
1984 lines
41 KiB
ArmAsm
/* Highly optimized version for x86-64.
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Copyright (C) 1999, 2000, 2002, 2003, 2005, 2009
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Based on i686 version contributed by Ulrich Drepper
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<drepper@cygnus.com>, 1999.
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Updated with SSE2 support contributed by Intel Corporation.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include "asm-syntax.h"
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#include "bp-sym.h"
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#include "bp-asm.h"
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#undef UPDATE_STRNCMP_COUNTER
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#ifndef LABEL
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#define LABEL(l) L(l)
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#endif
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#ifdef USE_AS_STRNCMP
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/* Since the counter, %r11, is unsigned, we branch to strcmp_exitz
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if the new counter > the old one or is 0. */
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# define UPDATE_STRNCMP_COUNTER \
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/* calculate left number to compare */ \
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lea -16(%rcx, %r11), %r9; \
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cmp %r9, %r11; \
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jb LABEL(strcmp_exitz); \
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test %r9, %r9; \
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je LABEL(strcmp_exitz); \
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mov %r9, %r11
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#else
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# define UPDATE_STRNCMP_COUNTER
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# ifndef STRCMP
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# define STRCMP strcmp
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# endif
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#endif
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.text
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ENTRY (BP_SYM (STRCMP))
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#ifdef NOT_IN_libc
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/* Simple version since we can't use SSE registers in ld.so. */
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L(oop): movb (%rdi), %al
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cmpb (%rsi), %al
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jne L(neq)
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incq %rdi
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incq %rsi
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testb %al, %al
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jnz L(oop)
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xorl %eax, %eax
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ret
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L(neq): movl $1, %eax
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movl $-1, %ecx
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cmovbl %ecx, %eax
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ret
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END (BP_SYM (STRCMP))
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#else /* NOT_IN_libc */
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/*
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* This implementation uses SSE to compare up to 16 bytes at a time.
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*/
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#ifdef USE_AS_STRNCMP
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test %rdx, %rdx
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je LABEL(strcmp_exitz)
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cmp $1, %rdx
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je LABEL(Byte0)
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mov %rdx, %r11
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#endif
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mov %esi, %ecx
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mov %edi, %eax
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/* Use 64bit AND here to avoid long NOP padding. */
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and $0x3f, %rcx /* rsi alignment in cache line */
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and $0x3f, %rax /* rdi alignment in cache line */
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cmp $0x30, %ecx
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ja LABEL(crosscache) /* rsi: 16-byte load will cross cache line */
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cmp $0x30, %eax
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ja LABEL(crosscache) /* rdi: 16-byte load will cross cache line */
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movlpd (%rdi), %xmm1
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movlpd (%rsi), %xmm2
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movhpd 8(%rdi), %xmm1
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movhpd 8(%rsi), %xmm2
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pxor %xmm0, %xmm0 /* clear %xmm0 for null char checks */
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pcmpeqb %xmm1, %xmm0 /* Any null chars? */
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pcmpeqb %xmm2, %xmm1 /* compare first 16 bytes for equality */
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psubb %xmm0, %xmm1 /* packed sub of comparison results*/
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx /* if first 16 bytes are same, edx == 0xffff */
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jnz LABEL(less16bytes) /* If not, find different value or null char */
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz) /* finish comparision */
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#endif
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add $16, %rsi /* prepare to search next 16 bytes */
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add $16, %rdi /* prepare to search next 16 bytes */
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/*
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* Determine source and destination string offsets from 16-byte alignment.
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* Use relative offset difference between the two to determine which case
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* below to use.
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*/
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.p2align 4
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LABEL(crosscache):
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and $0xfffffffffffffff0, %rsi /* force %rsi is 16 byte aligned */
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and $0xfffffffffffffff0, %rdi /* force %rdi is 16 byte aligned */
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mov $0xffff, %edx /* for equivalent offset */
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xor %r8d, %r8d
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and $0xf, %ecx /* offset of rsi */
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and $0xf, %eax /* offset of rdi */
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cmp %eax, %ecx
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je LABEL(ashr_0) /* rsi and rdi relative offset same */
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ja LABEL(bigger)
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mov %edx, %r8d /* r8d is offset flag for exit tail */
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xchg %ecx, %eax
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xchg %rsi, %rdi
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LABEL(bigger):
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lea 15(%rax), %r9
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sub %rcx, %r9
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lea LABEL(unaligned_table)(%rip), %r10
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movslq (%r10, %r9,4), %r9
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lea (%r10, %r9), %r10
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jmp *%r10 /* jump to corresponding case */
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/*
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* The following cases will be handled by ashr_0
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* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
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* n(0~15) n(0~15) 15(15+ n-n) ashr_0
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*/
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.p2align 4
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LABEL(ashr_0):
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movdqa (%rsi), %xmm1
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pxor %xmm0, %xmm0 /* clear %xmm0 for null char check */
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pcmpeqb %xmm1, %xmm0 /* Any null chars? */
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pcmpeqb (%rdi), %xmm1 /* compare 16 bytes for equality */
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psubb %xmm0, %xmm1 /* packed sub of comparison results*/
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pmovmskb %xmm1, %r9d
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shr %cl, %edx /* adjust 0xffff for offset */
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shr %cl, %r9d /* adjust for 16-byte offset */
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sub %r9d, %edx
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/*
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* edx must be the same with r9d if in left byte (16-rcx) is equal to
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* the start from (16-rax) and no null char was seen.
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*/
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jne LABEL(less32bytes) /* mismatch or null char */
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UPDATE_STRNCMP_COUNTER
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mov $16, %rcx
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mov $16, %r9
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pxor %xmm0, %xmm0 /* clear xmm0, may have changed above */
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/*
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* Now both strings are aligned at 16-byte boundary. Loop over strings
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* checking 32-bytes per iteration.
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*/
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.p2align 4
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LABEL(loop_ashr_0):
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit) /* mismatch or null char seen */
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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jmp LABEL(loop_ashr_0)
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/*
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* The following cases will be handled by ashr_1
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* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
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* n(15) n -15 0(15 +(n-15) - n) ashr_1
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*/
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.p2align 4
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LABEL(ashr_1):
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pxor %xmm0, %xmm0
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movdqa (%rdi), %xmm2
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movdqa (%rsi), %xmm1
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pcmpeqb %xmm1, %xmm0 /* Any null chars? */
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pslldq $15, %xmm2 /* shift first string to align with second */
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pcmpeqb %xmm1, %xmm2 /* compare 16 bytes for equality */
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psubb %xmm0, %xmm2 /* packed sub of comparison results*/
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pmovmskb %xmm2, %r9d
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shr %cl, %edx /* adjust 0xffff for offset */
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shr %cl, %r9d /* adjust for 16-byte offset */
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sub %r9d, %edx
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jnz LABEL(less32bytes) /* mismatch or null char seen */
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movdqa (%rdi), %xmm3
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UPDATE_STRNCMP_COUNTER
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pxor %xmm0, %xmm0
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mov $16, %rcx /* index for loads*/
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mov $1, %r9d /* byte position left over from less32bytes case */
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/*
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* Setup %r10 value allows us to detect crossing a page boundary.
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* When %r10 goes positive we have crossed a page boundary and
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* need to do a nibble.
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*/
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lea 1(%rdi), %r10
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and $0xfff, %r10 /* offset into 4K page */
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sub $0x1000, %r10 /* subtract 4K pagesize */
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.p2align 4
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LABEL(loop_ashr_1):
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add $16, %r10
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jg LABEL(nibble_ashr_1) /* cross page boundary */
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LABEL(gobble_ashr_1):
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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movdqa %xmm2, %xmm4 /* store for next cycle */
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psrldq $1, %xmm3
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pslldq $15, %xmm2
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por %xmm3, %xmm2 /* merge into one 16byte value */
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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movdqa %xmm4, %xmm3
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add $16, %r10
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jg LABEL(nibble_ashr_1) /* cross page boundary */
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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movdqa %xmm2, %xmm4 /* store for next cycle */
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psrldq $1, %xmm3
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pslldq $15, %xmm2
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por %xmm3, %xmm2 /* merge into one 16byte value */
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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movdqa %xmm4, %xmm3
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jmp LABEL(loop_ashr_1)
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/*
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* Nibble avoids loads across page boundary. This is to avoid a potential
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* access into unmapped memory.
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*/
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.p2align 4
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LABEL(nibble_ashr_1):
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pcmpeqb %xmm3, %xmm0 /* check nibble for null char*/
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pmovmskb %xmm0, %edx
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test $0xfffe, %edx
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jnz LABEL(ashr_1_exittail) /* find null char*/
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#ifdef USE_AS_STRNCMP
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cmp $14, %r11
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jbe LABEL(ashr_1_exittail)
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#endif
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pxor %xmm0, %xmm0
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sub $0x1000, %r10 /* substract 4K from %r10 */
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jmp LABEL(gobble_ashr_1)
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/*
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* Once find null char, determine if there is a string mismatch
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* before the null char.
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*/
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.p2align 4
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LABEL(ashr_1_exittail):
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movdqa (%rsi, %rcx), %xmm1
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psrldq $1, %xmm0
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psrldq $1, %xmm3
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jmp LABEL(aftertail)
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/*
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* The following cases will be handled by ashr_2
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* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
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* n(14~15) n -14 1(15 +(n-14) - n) ashr_2
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*/
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.p2align 4
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LABEL(ashr_2):
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pxor %xmm0, %xmm0
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movdqa (%rdi), %xmm2
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movdqa (%rsi), %xmm1
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pcmpeqb %xmm1, %xmm0
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pslldq $14, %xmm2
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pcmpeqb %xmm1, %xmm2
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psubb %xmm0, %xmm2
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pmovmskb %xmm2, %r9d
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shr %cl, %edx
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shr %cl, %r9d
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sub %r9d, %edx
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jnz LABEL(less32bytes)
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movdqa (%rdi), %xmm3
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UPDATE_STRNCMP_COUNTER
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pxor %xmm0, %xmm0
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mov $16, %rcx /* index for loads */
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mov $2, %r9d /* byte position left over from less32bytes case */
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/*
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* Setup %r10 value allows us to detect crossing a page boundary.
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* When %r10 goes positive we have crossed a page boundary and
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* need to do a nibble.
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*/
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lea 2(%rdi), %r10
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and $0xfff, %r10 /* offset into 4K page */
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sub $0x1000, %r10 /* subtract 4K pagesize */
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.p2align 4
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LABEL(loop_ashr_2):
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add $16, %r10
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jg LABEL(nibble_ashr_2)
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LABEL(gobble_ashr_2):
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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movdqa %xmm2, %xmm4
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psrldq $2, %xmm3
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pslldq $14, %xmm2
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por %xmm3, %xmm2
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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movdqa %xmm4, %xmm3
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add $16, %r10
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jg LABEL(nibble_ashr_2) /* cross page boundary */
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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movdqa %xmm2, %xmm4
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psrldq $2, %xmm3
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pslldq $14, %xmm2
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por %xmm3, %xmm2
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm2, %xmm1
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psubb %xmm0, %xmm1
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pmovmskb %xmm1, %edx
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sub $0xffff, %edx
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jnz LABEL(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe LABEL(strcmp_exitz)
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#endif
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add $16, %rcx
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movdqa %xmm4, %xmm3
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jmp LABEL(loop_ashr_2)
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.p2align 4
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LABEL(nibble_ashr_2):
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pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
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pmovmskb %xmm0, %edx
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test $0xfffc, %edx
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jnz LABEL(ashr_2_exittail)
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#ifdef USE_AS_STRNCMP
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cmp $13, %r11
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jbe LABEL(ashr_2_exittail)
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#endif
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pxor %xmm0, %xmm0
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sub $0x1000, %r10
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jmp LABEL(gobble_ashr_2)
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.p2align 4
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LABEL(ashr_2_exittail):
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movdqa (%rsi, %rcx), %xmm1
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psrldq $2, %xmm0
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psrldq $2, %xmm3
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jmp LABEL(aftertail)
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/*
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* The following cases will be handled by ashr_3
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* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
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* n(13~15) n -13 2(15 +(n-13) - n) ashr_3
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*/
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.p2align 4
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LABEL(ashr_3):
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pxor %xmm0, %xmm0
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movdqa (%rdi), %xmm2
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movdqa (%rsi), %xmm1
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pcmpeqb %xmm1, %xmm0
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pslldq $13, %xmm2
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pcmpeqb %xmm1, %xmm2
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psubb %xmm0, %xmm2
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pmovmskb %xmm2, %r9d
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shr %cl, %edx
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shr %cl, %r9d
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sub %r9d, %edx
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jnz LABEL(less32bytes)
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movdqa (%rdi), %xmm3
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UPDATE_STRNCMP_COUNTER
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pxor %xmm0, %xmm0
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mov $16, %rcx /* index for loads */
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mov $3, %r9d /* byte position left over from less32bytes case */
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/*
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* Setup %r10 value allows us to detect crossing a page boundary.
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* When %r10 goes positive we have crossed a page boundary and
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* need to do a nibble.
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*/
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lea 3(%rdi), %r10
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and $0xfff, %r10 /* offset into 4K page */
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sub $0x1000, %r10 /* subtract 4K pagesize */
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.p2align 4
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LABEL(loop_ashr_3):
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add $16, %r10
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jg LABEL(nibble_ashr_3)
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LABEL(gobble_ashr_3):
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movdqa (%rsi, %rcx), %xmm1
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movdqa (%rdi, %rcx), %xmm2
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movdqa %xmm2, %xmm4
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psrldq $3, %xmm3
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pslldq $13, %xmm2
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|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_3) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $3, %xmm3
|
|
pslldq $13, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_3)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_3):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfff8, %edx
|
|
jnz LABEL(ashr_3_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $12, %r11
|
|
jbe LABEL(ashr_3_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_3)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_3_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $3, %xmm0
|
|
psrldq $3, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_4
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(12~15) n -12 3(15 +(n-12) - n) ashr_4
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_4):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $12, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $4, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 4(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_4):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_4)
|
|
|
|
LABEL(gobble_ashr_4):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $4, %xmm3
|
|
pslldq $12, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_4) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $4, %xmm3
|
|
pslldq $12, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_4)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_4):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfff0, %edx
|
|
jnz LABEL(ashr_4_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $11, %r11
|
|
jbe LABEL(ashr_4_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_4)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_4_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $4, %xmm0
|
|
psrldq $4, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_5
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(11~15) n - 11 4(15 +(n-11) - n) ashr_5
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_5):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $11, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $5, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 5(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_5):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_5)
|
|
|
|
LABEL(gobble_ashr_5):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $5, %xmm3
|
|
pslldq $11, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_5) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $5, %xmm3
|
|
pslldq $11, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_5)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_5):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xffe0, %edx
|
|
jnz LABEL(ashr_5_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $10, %r11
|
|
jbe LABEL(ashr_5_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_5)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_5_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $5, %xmm0
|
|
psrldq $5, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_6
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(10~15) n - 10 5(15 +(n-10) - n) ashr_6
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_6):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $10, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $6, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 6(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_6):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_6)
|
|
|
|
LABEL(gobble_ashr_6):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $6, %xmm3
|
|
pslldq $10, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_6) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $6, %xmm3
|
|
pslldq $10, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_6)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_6):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xffc0, %edx
|
|
jnz LABEL(ashr_6_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $9, %r11
|
|
jbe LABEL(ashr_6_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_6)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_6_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $6, %xmm0
|
|
psrldq $6, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_7
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(9~15) n - 9 6(15 +(n - 9) - n) ashr_7
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_7):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $9, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $7, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 7(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_7):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_7)
|
|
|
|
LABEL(gobble_ashr_7):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $7, %xmm3
|
|
pslldq $9, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_7) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $7, %xmm3
|
|
pslldq $9, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_7)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_7):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xff80, %edx
|
|
jnz LABEL(ashr_7_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $8, %r11
|
|
jbe LABEL(ashr_7_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_7)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_7_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $7, %xmm0
|
|
psrldq $7, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_8
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(8~15) n - 8 7(15 +(n - 8) - n) ashr_8
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_8):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $8, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $8, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 8(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_8):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_8)
|
|
|
|
LABEL(gobble_ashr_8):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $8, %xmm3
|
|
pslldq $8, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_8) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $8, %xmm3
|
|
pslldq $8, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_8)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_8):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xff00, %edx
|
|
jnz LABEL(ashr_8_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $7, %r11
|
|
jbe LABEL(ashr_8_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_8)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_8_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $8, %xmm0
|
|
psrldq $8, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_9
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(7~15) n - 7 8(15 +(n - 7) - n) ashr_9
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_9):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $7, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $9, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 9(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_9):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_9)
|
|
|
|
LABEL(gobble_ashr_9):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $9, %xmm3
|
|
pslldq $7, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_9) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $9, %xmm3
|
|
pslldq $7, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3 /* store for next cycle */
|
|
jmp LABEL(loop_ashr_9)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_9):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfe00, %edx
|
|
jnz LABEL(ashr_9_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $6, %r11
|
|
jbe LABEL(ashr_9_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_9)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_9_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $9, %xmm0
|
|
psrldq $9, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_10
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(6~15) n - 6 9(15 +(n - 6) - n) ashr_10
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_10):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $6, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $10, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 10(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_10):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_10)
|
|
|
|
LABEL(gobble_ashr_10):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $10, %xmm3
|
|
pslldq $6, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_10) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $10, %xmm3
|
|
pslldq $6, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_10)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_10):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfc00, %edx
|
|
jnz LABEL(ashr_10_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $5, %r11
|
|
jbe LABEL(ashr_10_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_10)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_10_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $10, %xmm0
|
|
psrldq $10, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_11
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(5~15) n - 5 10(15 +(n - 5) - n) ashr_11
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_11):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $5, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $11, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 11(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_11):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_11)
|
|
|
|
LABEL(gobble_ashr_11):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $11, %xmm3
|
|
pslldq $5, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_11) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $11, %xmm3
|
|
pslldq $5, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_11)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_11):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xf800, %edx
|
|
jnz LABEL(ashr_11_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $4, %r11
|
|
jbe LABEL(ashr_11_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_11)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_11_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $11, %xmm0
|
|
psrldq $11, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_12
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(4~15) n - 4 11(15 +(n - 4) - n) ashr_12
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_12):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $4, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $12, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 12(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_12):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_12)
|
|
|
|
LABEL(gobble_ashr_12):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $12, %xmm3
|
|
pslldq $4, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_12) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $12, %xmm3
|
|
pslldq $4, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_12)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_12):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xf000, %edx
|
|
jnz LABEL(ashr_12_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $3, %r11
|
|
jbe LABEL(ashr_12_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_12)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_12_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $12, %xmm0
|
|
psrldq $12, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_13
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(3~15) n - 3 12(15 +(n - 3) - n) ashr_13
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_13):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $3, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $13, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 13(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_13):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_13)
|
|
|
|
LABEL(gobble_ashr_13):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $13, %xmm3
|
|
pslldq $3, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_13) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $13, %xmm3
|
|
pslldq $3, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_13)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_13):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xe000, %edx
|
|
jnz LABEL(ashr_13_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $2, %r11
|
|
jbe LABEL(ashr_13_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_13)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_13_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $13, %xmm0
|
|
psrldq $13, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_14
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(2~15) n - 2 13(15 +(n - 2) - n) ashr_14
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_14):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $2, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $14, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 14(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_14):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_14)
|
|
|
|
LABEL(gobble_ashr_14):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $14, %xmm3
|
|
pslldq $2, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_14) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $14, %xmm3
|
|
pslldq $2, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_14)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_14):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xc000, %edx
|
|
jnz LABEL(ashr_14_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $1, %r11
|
|
jbe LABEL(ashr_14_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_14)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_14_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $14, %xmm0
|
|
psrldq $14, %xmm3
|
|
jmp LABEL(aftertail)
|
|
|
|
/*
|
|
* The following cases will be handled by ashr_15
|
|
* rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case
|
|
* n(1~15) n - 1 14(15 +(n - 1) - n) ashr_15
|
|
*/
|
|
.p2align 4
|
|
LABEL(ashr_15):
|
|
pxor %xmm0, %xmm0
|
|
movdqa (%rdi), %xmm2
|
|
movdqa (%rsi), %xmm1
|
|
pcmpeqb %xmm1, %xmm0
|
|
pslldq $1, %xmm2
|
|
pcmpeqb %xmm1, %xmm2
|
|
psubb %xmm0, %xmm2
|
|
pmovmskb %xmm2, %r9d
|
|
shr %cl, %edx
|
|
shr %cl, %r9d
|
|
sub %r9d, %edx
|
|
jnz LABEL(less32bytes)
|
|
|
|
movdqa (%rdi), %xmm3
|
|
|
|
UPDATE_STRNCMP_COUNTER
|
|
|
|
pxor %xmm0, %xmm0
|
|
mov $16, %rcx /* index for loads */
|
|
mov $15, %r9d /* byte position left over from less32bytes case */
|
|
/*
|
|
* Setup %r10 value allows us to detect crossing a page boundary.
|
|
* When %r10 goes positive we have crossed a page boundary and
|
|
* need to do a nibble.
|
|
*/
|
|
lea 15(%rdi), %r10
|
|
and $0xfff, %r10 /* offset into 4K page */
|
|
|
|
sub $0x1000, %r10 /* subtract 4K pagesize */
|
|
|
|
.p2align 4
|
|
LABEL(loop_ashr_15):
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_15)
|
|
|
|
LABEL(gobble_ashr_15):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $15, %xmm3
|
|
pslldq $1, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg LABEL(nibble_ashr_15) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
psrldq $15, %xmm3
|
|
pslldq $1, %xmm2
|
|
por %xmm3, %xmm2
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz LABEL(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp LABEL(loop_ashr_15)
|
|
|
|
.p2align 4
|
|
LABEL(nibble_ashr_15):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0x8000, %edx
|
|
jnz LABEL(ashr_15_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
test %r11, %r11
|
|
je LABEL(ashr_15_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp LABEL(gobble_ashr_15)
|
|
|
|
.p2align 4
|
|
LABEL(ashr_15_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $15, %xmm3
|
|
psrldq $15, %xmm0
|
|
|
|
.p2align 4
|
|
LABEL(aftertail):
|
|
pcmpeqb %xmm3, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
not %edx
|
|
|
|
.p2align 4
|
|
LABEL(exit):
|
|
lea -16(%r9, %rcx), %rax /* locate the exact offset for rdi */
|
|
LABEL(less32bytes):
|
|
lea (%rdi, %rax), %rdi /* locate the exact address for first operand(rdi) */
|
|
lea (%rsi, %rcx), %rsi /* locate the exact address for second operand(rsi) */
|
|
test %r8d, %r8d
|
|
jz LABEL(ret)
|
|
xchg %rsi, %rdi /* recover original order according to flag(%r8d) */
|
|
|
|
.p2align 4
|
|
LABEL(ret):
|
|
LABEL(less16bytes):
|
|
bsf %rdx, %rdx /* find and store bit index in %rdx */
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub %rdx, %r11
|
|
jbe LABEL(strcmp_exitz)
|
|
#endif
|
|
movzbl (%rsi, %rdx), %ecx
|
|
movzbl (%rdi, %rdx), %eax
|
|
|
|
sub %ecx, %eax
|
|
ret
|
|
|
|
LABEL(strcmp_exitz):
|
|
xor %eax, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
LABEL(Byte0):
|
|
movzx (%rsi), %ecx
|
|
movzx (%rdi), %eax
|
|
|
|
sub %ecx, %eax
|
|
ret
|
|
END (BP_SYM (STRCMP))
|
|
|
|
.section .rodata,"a",@progbits
|
|
.p2align 3
|
|
LABEL(unaligned_table):
|
|
.int LABEL(ashr_1) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_2) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_3) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_4) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_5) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_6) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_7) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_8) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_9) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_10) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_11) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_12) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_13) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_14) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_15) - LABEL(unaligned_table)
|
|
.int LABEL(ashr_0) - LABEL(unaligned_table)
|
|
#endif /* NOT_IN_libc */
|
|
libc_hidden_builtin_def (STRCMP)
|