/* Highly optimized version for x86-64. Copyright (C) 1999, 2000, 2002, 2003, 2005, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Based on i686 version contributed by Ulrich Drepper , 1999. Updated with SSE2 support contributed by Intel Corporation. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include #include "asm-syntax.h" #include "bp-sym.h" #include "bp-asm.h" #undef UPDATE_STRNCMP_COUNTER #ifndef LABEL #define LABEL(l) L(l) #endif #ifdef USE_AS_STRNCMP /* Since the counter, %r11, is unsigned, we branch to strcmp_exitz if the new counter > the old one or is 0. */ # define UPDATE_STRNCMP_COUNTER \ /* calculate left number to compare */ \ lea -16(%rcx, %r11), %r9; \ cmp %r9, %r11; \ jb LABEL(strcmp_exitz); \ test %r9, %r9; \ je LABEL(strcmp_exitz); \ mov %r9, %r11 #else # define UPDATE_STRNCMP_COUNTER # ifndef STRCMP # define STRCMP strcmp # endif #endif #ifndef USE_SSSE3 .text #else .section .text.ssse3,"ax",@progbits #endif ENTRY (BP_SYM (STRCMP)) #ifdef NOT_IN_libc /* Simple version since we can't use SSE registers in ld.so. */ L(oop): movb (%rdi), %al cmpb (%rsi), %al jne L(neq) incq %rdi incq %rsi testb %al, %al jnz L(oop) xorl %eax, %eax ret L(neq): movl $1, %eax movl $-1, %ecx cmovbl %ecx, %eax ret END (BP_SYM (STRCMP)) #else /* NOT_IN_libc */ /* * This implementation uses SSE to compare up to 16 bytes at a time. */ #ifdef USE_AS_STRNCMP test %rdx, %rdx je LABEL(strcmp_exitz) cmp $1, %rdx je LABEL(Byte0) mov %rdx, %r11 #endif mov %esi, %ecx mov %edi, %eax /* Use 64bit AND here to avoid long NOP padding. */ and $0x3f, %rcx /* rsi alignment in cache line */ and $0x3f, %rax /* rdi alignment in cache line */ cmp $0x30, %ecx ja LABEL(crosscache) /* rsi: 16-byte load will cross cache line */ cmp $0x30, %eax ja LABEL(crosscache) /* rdi: 16-byte load will cross cache line */ movlpd (%rdi), %xmm1 movlpd (%rsi), %xmm2 movhpd 8(%rdi), %xmm1 movhpd 8(%rsi), %xmm2 pxor %xmm0, %xmm0 /* clear %xmm0 for null char checks */ pcmpeqb %xmm1, %xmm0 /* Any null chars? */ pcmpeqb %xmm2, %xmm1 /* compare first 16 bytes for equality */ psubb %xmm0, %xmm1 /* packed sub of comparison results*/ pmovmskb %xmm1, %edx sub $0xffff, %edx /* if first 16 bytes are same, edx == 0xffff */ jnz LABEL(less16bytes) /* If not, find different value or null char */ #ifdef USE_AS_STRNCMP sub $16, %r11 jbe LABEL(strcmp_exitz) /* finish comparision */ #endif add $16, %rsi /* prepare to search next 16 bytes */ add $16, %rdi /* prepare to search next 16 bytes */ /* * Determine source and destination string offsets from 16-byte alignment. * Use relative offset difference between the two to determine which case * below to use. */ .p2align 4 LABEL(crosscache): and $0xfffffffffffffff0, %rsi /* force %rsi is 16 byte aligned */ and $0xfffffffffffffff0, %rdi /* force %rdi is 16 byte aligned */ mov $0xffff, %edx /* for equivalent offset */ xor %r8d, %r8d and $0xf, %ecx /* offset of rsi */ and $0xf, %eax /* offset of rdi */ cmp %eax, %ecx je LABEL(ashr_0) /* rsi and rdi relative offset same */ ja LABEL(bigger) mov %edx, %r8d /* r8d is offset flag for exit tail */ xchg %ecx, %eax xchg %rsi, %rdi LABEL(bigger): lea 15(%rax), %r9 sub %rcx, %r9 lea LABEL(unaligned_table)(%rip), %r10 movslq (%r10, %r9,4), %r9 lea (%r10, %r9), %r10 jmp *%r10 /* jump to corresponding case */ /* * The following cases will be handled by ashr_0 * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case * n(0~15) n(0~15) 15(15+ n-n) ashr_0 */ .p2align 4 LABEL(ashr_0): movdqa (%rsi), %xmm1 pxor %xmm0, %xmm0 /* clear %xmm0 for null char check */ pcmpeqb %xmm1, %xmm0 /* Any null chars? */ pcmpeqb (%rdi), %xmm1 /* compare 16 bytes for equality */ psubb %xmm0, %xmm1 /* packed sub of comparison results*/ pmovmskb %xmm1, %r9d shr %cl, %edx /* adjust 0xffff for offset */ shr %cl, %r9d /* adjust for 16-byte offset */ sub %r9d, %edx /* * edx must be the same with r9d if in left byte (16-rcx) is equal to * the start from (16-rax) and no null char was seen. */ jne LABEL(less32bytes) /* mismatch or null char */ UPDATE_STRNCMP_COUNTER mov $16, %rcx mov $16, %r9 pxor %xmm0, %xmm0 /* clear xmm0, may have changed above */ /* * Now both strings are aligned at 16-byte boundary. Loop over strings * checking 32-bytes per iteration. */ .p2align 4 LABEL(loop_ashr_0): movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 pcmpeqb %xmm1, %xmm0 pcmpeqb %xmm2, %xmm1 psubb %xmm0, %xmm1 pmovmskb %xmm1, %edx sub $0xffff, %edx jnz LABEL(exit) /* mismatch or null char seen */ #ifdef USE_AS_STRNCMP sub $16, %r11 jbe LABEL(strcmp_exitz) #endif add $16, %rcx movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %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 jmp LABEL(loop_ashr_0) /* * The following cases will be handled by ashr_1 * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case * n(15) n -15 0(15 +(n-15) - n) ashr_1 */ .p2align 4 LABEL(ashr_1): pxor %xmm0, %xmm0 movdqa (%rdi), %xmm2 movdqa (%rsi), %xmm1 pcmpeqb %xmm1, %xmm0 /* Any null chars? */ pslldq $15, %xmm2 /* shift first string to align with second */ pcmpeqb %xmm1, %xmm2 /* compare 16 bytes for equality */ psubb %xmm0, %xmm2 /* packed sub of comparison results*/ pmovmskb %xmm2, %r9d shr %cl, %edx /* adjust 0xffff for offset */ shr %cl, %r9d /* adjust for 16-byte offset */ sub %r9d, %edx jnz LABEL(less32bytes) /* mismatch or null char seen */ movdqa (%rdi), %xmm3 UPDATE_STRNCMP_COUNTER pxor %xmm0, %xmm0 mov $16, %rcx /* index for loads*/ mov $1, %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 1(%rdi), %r10 and $0xfff, %r10 /* offset into 4K page */ sub $0x1000, %r10 /* subtract 4K pagesize */ .p2align 4 LABEL(loop_ashr_1): add $16, %r10 jg LABEL(nibble_ashr_1) /* cross page boundary */ LABEL(gobble_ashr_1): movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 movdqa %xmm2, %xmm4 /* store for next cycle */ #ifndef USE_SSSE3 psrldq $1, %xmm3 pslldq $15, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $1, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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_1) /* cross page boundary */ movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 movdqa %xmm2, %xmm4 /* store for next cycle */ #ifndef USE_SSSE3 psrldq $1, %xmm3 pslldq $15, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $1, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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_1) /* * Nibble avoids loads across page boundary. This is to avoid a potential * access into unmapped memory. */ .p2align 4 LABEL(nibble_ashr_1): pcmpeqb %xmm3, %xmm0 /* check nibble for null char*/ pmovmskb %xmm0, %edx test $0xfffe, %edx jnz LABEL(ashr_1_exittail) /* find null char*/ #ifdef USE_AS_STRNCMP cmp $15, %r11 jbe LABEL(ashr_1_exittail) #endif pxor %xmm0, %xmm0 sub $0x1000, %r10 /* substract 4K from %r10 */ jmp LABEL(gobble_ashr_1) /* * Once find null char, determine if there is a string mismatch * before the null char. */ .p2align 4 LABEL(ashr_1_exittail): movdqa (%rsi, %rcx), %xmm1 psrldq $1, %xmm0 psrldq $1, %xmm3 jmp LABEL(aftertail) /* * The following cases will be handled by ashr_2 * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case * n(14~15) n -14 1(15 +(n-14) - n) ashr_2 */ .p2align 4 LABEL(ashr_2): pxor %xmm0, %xmm0 movdqa (%rdi), %xmm2 movdqa (%rsi), %xmm1 pcmpeqb %xmm1, %xmm0 pslldq $14, %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 $2, %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 2(%rdi), %r10 and $0xfff, %r10 /* offset into 4K page */ sub $0x1000, %r10 /* subtract 4K pagesize */ .p2align 4 LABEL(loop_ashr_2): add $16, %r10 jg LABEL(nibble_ashr_2) LABEL(gobble_ashr_2): movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 movdqa %xmm2, %xmm4 #ifndef USE_SSSE3 psrldq $2, %xmm3 pslldq $14, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $2, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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_2) /* cross page boundary */ movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 movdqa %xmm2, %xmm4 #ifndef USE_SSSE3 psrldq $2, %xmm3 pslldq $14, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $2, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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_2) .p2align 4 LABEL(nibble_ashr_2): pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ pmovmskb %xmm0, %edx test $0xfffc, %edx jnz LABEL(ashr_2_exittail) #ifdef USE_AS_STRNCMP cmp $14, %r11 jbe LABEL(ashr_2_exittail) #endif pxor %xmm0, %xmm0 sub $0x1000, %r10 jmp LABEL(gobble_ashr_2) .p2align 4 LABEL(ashr_2_exittail): movdqa (%rsi, %rcx), %xmm1 psrldq $2, %xmm0 psrldq $2, %xmm3 jmp LABEL(aftertail) /* * The following cases will be handled by ashr_3 * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case * n(13~15) n -13 2(15 +(n-13) - n) ashr_3 */ .p2align 4 LABEL(ashr_3): pxor %xmm0, %xmm0 movdqa (%rdi), %xmm2 movdqa (%rsi), %xmm1 pcmpeqb %xmm1, %xmm0 pslldq $13, %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 $3, %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 3(%rdi), %r10 and $0xfff, %r10 /* offset into 4K page */ sub $0x1000, %r10 /* subtract 4K pagesize */ .p2align 4 LABEL(loop_ashr_3): add $16, %r10 jg LABEL(nibble_ashr_3) LABEL(gobble_ashr_3): movdqa (%rsi, %rcx), %xmm1 movdqa (%rdi, %rcx), %xmm2 movdqa %xmm2, %xmm4 #ifndef USE_SSSE3 psrldq $3, %xmm3 pslldq $13, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $3, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $3, %xmm3 pslldq $13, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $3, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $13, %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 #ifndef USE_SSSE3 psrldq $4, %xmm3 pslldq $12, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $4, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $4, %xmm3 pslldq $12, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $4, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $12, %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 #ifndef USE_SSSE3 psrldq $5, %xmm3 pslldq $11, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $5, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $5, %xmm3 pslldq $11, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $5, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $11, %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 #ifndef USE_SSSE3 psrldq $6, %xmm3 pslldq $10, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $6, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $6, %xmm3 pslldq $10, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $6, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $10, %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 #ifndef USE_SSSE3 psrldq $7, %xmm3 pslldq $9, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $7, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $7, %xmm3 pslldq $9, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $7, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $9, %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 #ifndef USE_SSSE3 psrldq $8, %xmm3 pslldq $8, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $8, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $8, %xmm3 pslldq $8, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $8, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $8, %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 #ifndef USE_SSSE3 psrldq $9, %xmm3 pslldq $7, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $9, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $9, %xmm3 pslldq $7, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $9, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $7, %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 #ifndef USE_SSSE3 psrldq $10, %xmm3 pslldq $6, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $10, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $10, %xmm3 pslldq $6, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $10, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $6, %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 #ifndef USE_SSSE3 psrldq $11, %xmm3 pslldq $5, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $11, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $11, %xmm3 pslldq $5, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $11, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $5, %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 #ifndef USE_SSSE3 psrldq $12, %xmm3 pslldq $4, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $12, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $12, %xmm3 pslldq $4, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $12, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $4, %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 #ifndef USE_SSSE3 psrldq $13, %xmm3 pslldq $3, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $13, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $13, %xmm3 pslldq $3, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $13, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $3, %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 #ifndef USE_SSSE3 psrldq $14, %xmm3 pslldq $2, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $14, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $14, %xmm3 pslldq $2, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $14, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 $2, %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 #ifndef USE_SSSE3 psrldq $15, %xmm3 pslldq $1, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $15, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 #ifndef USE_SSSE3 psrldq $15, %xmm3 pslldq $1, %xmm2 por %xmm3, %xmm2 /* merge into one 16byte value */ #else palignr $15, %xmm3, %xmm2 /* merge into one 16byte value */ #endif 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 cmpq $1, %r11 jbe 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)