e6553eee5a
port optimized string functions for x86_64 from Bionic (BSD licensed) Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
1938 lines
42 KiB
ArmAsm
1938 lines
42 KiB
ArmAsm
/*********************************************************************************
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* libs/libc/machine/x86_64/gnu/arch_strcmp.S
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*
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* Copyright (c) 2014, Intel Corporation
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* * this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* * this list of conditions and the following disclaimer in the documentation
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* * and/or other materials provided with the distribution.
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*
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* * Neither the name of Intel Corporation nor the names of its contributors
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* * may be used to endorse or promote products derived from this software
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* * without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*********************************************************************************/
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/*********************************************************************************
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* Pre-processor Definitions
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*********************************************************************************/
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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 L(strcmp_exitz); \
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test %r9, %r9; \
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je L(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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#ifndef L
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# define L(label) .L##label
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#endif
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#ifndef cfi_startproc
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# define cfi_startproc .cfi_startproc
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#endif
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#ifndef cfi_endproc
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# define cfi_endproc .cfi_endproc
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#endif
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#ifndef ENTRY
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# define ENTRY(name) \
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.type name, @function; \
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.globl name; \
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.p2align 4; \
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name: \
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cfi_startproc
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#endif
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#ifndef END
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# define END(name) \
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cfi_endproc; \
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.size name, .-name
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#endif
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#define RETURN ret
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/*********************************************************************************
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* Public Functions
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*********************************************************************************/
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.section .text.ssse3,"ax",@progbits
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ENTRY (STRCMP)
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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 L(strcmp_exitz)
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cmp $1, %rdx
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je L(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 L(crosscache) /* rsi: 16-byte load will cross cache line */
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cmp $0x30, %eax
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ja L(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 L(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 L(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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L(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 L(ashr_0) /* rsi and rdi relative offset same */
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ja L(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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L(bigger):
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lea 15(%rax), %r9
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sub %rcx, %r9
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lea L(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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L(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 L(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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L(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 L(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 L(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 L(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe L(strcmp_exitz)
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#endif
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add $16, %rcx
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jmp L(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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L(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 L(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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L(loop_ashr_1):
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add $16, %r10
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jg L(nibble_ashr_1) /* cross page boundary */
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L(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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palignr $1, %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 L(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe L(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 L(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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palignr $1, %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 L(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe L(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 L(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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L(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 L(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 L(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 L(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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L(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 L(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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L(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 L(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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L(loop_ashr_2):
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add $16, %r10
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jg L(nibble_ashr_2)
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L(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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palignr $2, %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 L(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe L(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 L(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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palignr $2, %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 L(exit)
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#ifdef USE_AS_STRNCMP
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sub $16, %r11
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jbe L(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 L(loop_ashr_2)
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.p2align 4
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L(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 L(ashr_2_exittail)
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#ifdef USE_AS_STRNCMP
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cmp $13, %r11
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jbe L(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 L(gobble_ashr_2)
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.p2align 4
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L(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 L(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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L(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 L(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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L(loop_ashr_3):
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add $16, %r10
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jg L(nibble_ashr_3)
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L(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
|
|
|
|
palignr $3, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_3) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $3, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_3)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_3):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfff8, %edx
|
|
jnz L(ashr_3_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $12, %r11
|
|
jbe L(ashr_3_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_3)
|
|
|
|
.p2align 4
|
|
L(ashr_3_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $3, %xmm0
|
|
psrldq $3, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_4):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_4)
|
|
|
|
L(gobble_ashr_4):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $4, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_4) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $4, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_4)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_4):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfff0, %edx
|
|
jnz L(ashr_4_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $11, %r11
|
|
jbe L(ashr_4_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_4)
|
|
|
|
.p2align 4
|
|
L(ashr_4_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $4, %xmm0
|
|
psrldq $4, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_5):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_5)
|
|
|
|
L(gobble_ashr_5):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $5, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_5) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $5, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_5)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_5):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xffe0, %edx
|
|
jnz L(ashr_5_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $10, %r11
|
|
jbe L(ashr_5_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_5)
|
|
|
|
.p2align 4
|
|
L(ashr_5_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $5, %xmm0
|
|
psrldq $5, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_6):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_6)
|
|
|
|
L(gobble_ashr_6):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $6, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_6) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $6, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_6)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_6):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xffc0, %edx
|
|
jnz L(ashr_6_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $9, %r11
|
|
jbe L(ashr_6_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_6)
|
|
|
|
.p2align 4
|
|
L(ashr_6_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $6, %xmm0
|
|
psrldq $6, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_7):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_7)
|
|
|
|
L(gobble_ashr_7):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $7, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_7) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $7, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_7)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_7):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xff80, %edx
|
|
jnz L(ashr_7_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $8, %r11
|
|
jbe L(ashr_7_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_7)
|
|
|
|
.p2align 4
|
|
L(ashr_7_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $7, %xmm0
|
|
psrldq $7, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_8):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_8)
|
|
|
|
L(gobble_ashr_8):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $8, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_8) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $8, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_8)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_8):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xff00, %edx
|
|
jnz L(ashr_8_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $7, %r11
|
|
jbe L(ashr_8_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_8)
|
|
|
|
.p2align 4
|
|
L(ashr_8_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $8, %xmm0
|
|
psrldq $8, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_9):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_9)
|
|
|
|
L(gobble_ashr_9):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $9, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_9) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $9, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3 /* store for next cycle */
|
|
jmp L(loop_ashr_9)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_9):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfe00, %edx
|
|
jnz L(ashr_9_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $6, %r11
|
|
jbe L(ashr_9_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_9)
|
|
|
|
.p2align 4
|
|
L(ashr_9_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $9, %xmm0
|
|
psrldq $9, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_10):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_10)
|
|
|
|
L(gobble_ashr_10):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $10, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_10) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $10, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_10)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_10):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xfc00, %edx
|
|
jnz L(ashr_10_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $5, %r11
|
|
jbe L(ashr_10_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_10)
|
|
|
|
.p2align 4
|
|
L(ashr_10_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $10, %xmm0
|
|
psrldq $10, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_11):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_11)
|
|
|
|
L(gobble_ashr_11):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $11, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_11) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $11, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_11)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_11):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xf800, %edx
|
|
jnz L(ashr_11_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $4, %r11
|
|
jbe L(ashr_11_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_11)
|
|
|
|
.p2align 4
|
|
L(ashr_11_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $11, %xmm0
|
|
psrldq $11, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_12):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_12)
|
|
|
|
L(gobble_ashr_12):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $12, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_12) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $12, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_12)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_12):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xf000, %edx
|
|
jnz L(ashr_12_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $3, %r11
|
|
jbe L(ashr_12_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_12)
|
|
|
|
.p2align 4
|
|
L(ashr_12_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $12, %xmm0
|
|
psrldq $12, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_13):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_13)
|
|
|
|
L(gobble_ashr_13):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $13, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_13) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $13, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_13)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_13):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xe000, %edx
|
|
jnz L(ashr_13_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $2, %r11
|
|
jbe L(ashr_13_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_13)
|
|
|
|
.p2align 4
|
|
L(ashr_13_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $13, %xmm0
|
|
psrldq $13, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_14):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_14)
|
|
|
|
L(gobble_ashr_14):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $14, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_14) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $14, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_14)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_14):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0xc000, %edx
|
|
jnz L(ashr_14_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
cmp $1, %r11
|
|
jbe L(ashr_14_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_14)
|
|
|
|
.p2align 4
|
|
L(ashr_14_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $14, %xmm0
|
|
psrldq $14, %xmm3
|
|
jmp L(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
|
|
L(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 L(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
|
|
L(loop_ashr_15):
|
|
add $16, %r10
|
|
jg L(nibble_ashr_15)
|
|
|
|
L(gobble_ashr_15):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $15, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
|
|
add $16, %r10
|
|
jg L(nibble_ashr_15) /* cross page boundary */
|
|
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
movdqa (%rdi, %rcx), %xmm2
|
|
movdqa %xmm2, %xmm4
|
|
|
|
palignr $15, %xmm3, %xmm2 /* merge into one 16byte value */
|
|
|
|
pcmpeqb %xmm1, %xmm0
|
|
pcmpeqb %xmm2, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
sub $0xffff, %edx
|
|
jnz L(exit)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub $16, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
|
|
add $16, %rcx
|
|
movdqa %xmm4, %xmm3
|
|
jmp L(loop_ashr_15)
|
|
|
|
.p2align 4
|
|
L(nibble_ashr_15):
|
|
pcmpeqb %xmm3, %xmm0 /* check nibble for null char */
|
|
pmovmskb %xmm0, %edx
|
|
test $0x8000, %edx
|
|
jnz L(ashr_15_exittail)
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
test %r11, %r11
|
|
je L(ashr_15_exittail)
|
|
#endif
|
|
|
|
pxor %xmm0, %xmm0
|
|
sub $0x1000, %r10
|
|
jmp L(gobble_ashr_15)
|
|
|
|
.p2align 4
|
|
L(ashr_15_exittail):
|
|
movdqa (%rsi, %rcx), %xmm1
|
|
psrldq $15, %xmm3
|
|
psrldq $15, %xmm0
|
|
|
|
.p2align 4
|
|
L(aftertail):
|
|
pcmpeqb %xmm3, %xmm1
|
|
psubb %xmm0, %xmm1
|
|
pmovmskb %xmm1, %edx
|
|
not %edx
|
|
|
|
.p2align 4
|
|
L(exit):
|
|
lea -16(%r9, %rcx), %rax /* locate the exact offset for rdi */
|
|
L(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 L(ret)
|
|
xchg %rsi, %rdi /* recover original order according to flag(%r8d) */
|
|
|
|
.p2align 4
|
|
L(ret):
|
|
L(less16bytes):
|
|
bsf %rdx, %rdx /* find and store bit index in %rdx */
|
|
|
|
#ifdef USE_AS_STRNCMP
|
|
sub %rdx, %r11
|
|
jbe L(strcmp_exitz)
|
|
#endif
|
|
movzbl (%rsi, %rdx), %ecx
|
|
movzbl (%rdi, %rdx), %eax
|
|
|
|
sub %ecx, %eax
|
|
ret
|
|
|
|
L(strcmp_exitz):
|
|
xor %eax, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(Byte0):
|
|
movzbl (%rsi), %ecx
|
|
movzbl (%rdi), %eax
|
|
|
|
sub %ecx, %eax
|
|
ret
|
|
END (STRCMP)
|
|
|
|
.section .rodata,"a",@progbits
|
|
.p2align 3
|
|
L(unaligned_table):
|
|
.int L(ashr_1) - L(unaligned_table)
|
|
.int L(ashr_2) - L(unaligned_table)
|
|
.int L(ashr_3) - L(unaligned_table)
|
|
.int L(ashr_4) - L(unaligned_table)
|
|
.int L(ashr_5) - L(unaligned_table)
|
|
.int L(ashr_6) - L(unaligned_table)
|
|
.int L(ashr_7) - L(unaligned_table)
|
|
.int L(ashr_8) - L(unaligned_table)
|
|
.int L(ashr_9) - L(unaligned_table)
|
|
.int L(ashr_10) - L(unaligned_table)
|
|
.int L(ashr_11) - L(unaligned_table)
|
|
.int L(ashr_12) - L(unaligned_table)
|
|
.int L(ashr_13) - L(unaligned_table)
|
|
.int L(ashr_14) - L(unaligned_table)
|
|
.int L(ashr_15) - L(unaligned_table)
|
|
.int L(ashr_0) - L(unaligned_table)
|