diff options
Diffstat (limited to 'sysdeps/x86_64/strcmp.S')
| -rw-r--r-- | sysdeps/x86_64/strcmp.S | 1948 |
1 files changed, 1943 insertions, 5 deletions
diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S index 119b88e40b..340a64ba35 100644 --- a/sysdeps/x86_64/strcmp.S +++ b/sysdeps/x86_64/strcmp.S @@ -1,8 +1,10 @@ /* Highly optimized version for x86-64. - Copyright (C) 1999, 2000, 2002, 2003, 2005 Free Software Foundation, Inc. + 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 <drepper@cygnus.com>, 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 @@ -24,8 +26,35 @@ #include "bp-sym.h" #include "bp-asm.h" - .text -ENTRY (BP_SYM (strcmp)) +#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 + + .text +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) @@ -41,5 +70,1914 @@ L(neq): movl $1, %eax movl $-1, %ecx cmovbl %ecx, %eax ret -END (BP_SYM (strcmp)) -libc_hidden_builtin_def (strcmp) +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 */ + + psrldq $1, %xmm3 + pslldq $15, %xmm2 + por %xmm3, %xmm2 /* merge into one 16byte value */ + + 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 */ + + psrldq $1, %xmm3 + pslldq $15, %xmm2 + por %xmm3, %xmm2 /* merge into one 16byte value */ + + 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 $14, %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 + + psrldq $2, %xmm3 + pslldq $14, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_2) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $2, %xmm3 + pslldq $14, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_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 $13, %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 + + psrldq $3, %xmm3 + pslldq $13, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_3) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $3, %xmm3 + pslldq $13, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_3) + + .p2align 4 +LABEL(nibble_ashr_3): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xfff8, %edx + jnz LABEL(ashr_3_exittail) + +#ifdef USE_AS_STRNCMP + cmp $12, %r11 + jbe LABEL(ashr_3_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_3) + + .p2align 4 +LABEL(ashr_3_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $3, %xmm0 + psrldq $3, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_4 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(12~15) n -12 3(15 +(n-12) - n) ashr_4 + */ + .p2align 4 +LABEL(ashr_4): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $12, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $4, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 4(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_4): + add $16, %r10 + jg LABEL(nibble_ashr_4) + +LABEL(gobble_ashr_4): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $4, %xmm3 + pslldq $12, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_4) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $4, %xmm3 + pslldq $12, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_4) + + .p2align 4 +LABEL(nibble_ashr_4): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xfff0, %edx + jnz LABEL(ashr_4_exittail) + +#ifdef USE_AS_STRNCMP + cmp $11, %r11 + jbe LABEL(ashr_4_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_4) + + .p2align 4 +LABEL(ashr_4_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $4, %xmm0 + psrldq $4, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_5 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(11~15) n - 11 4(15 +(n-11) - n) ashr_5 + */ + .p2align 4 +LABEL(ashr_5): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $11, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $5, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 5(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_5): + add $16, %r10 + jg LABEL(nibble_ashr_5) + +LABEL(gobble_ashr_5): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $5, %xmm3 + pslldq $11, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_5) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $5, %xmm3 + pslldq $11, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_5) + + .p2align 4 +LABEL(nibble_ashr_5): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xffe0, %edx + jnz LABEL(ashr_5_exittail) + +#ifdef USE_AS_STRNCMP + cmp $10, %r11 + jbe LABEL(ashr_5_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_5) + + .p2align 4 +LABEL(ashr_5_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $5, %xmm0 + psrldq $5, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_6 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(10~15) n - 10 5(15 +(n-10) - n) ashr_6 + */ + .p2align 4 +LABEL(ashr_6): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $10, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $6, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 6(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_6): + add $16, %r10 + jg LABEL(nibble_ashr_6) + +LABEL(gobble_ashr_6): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $6, %xmm3 + pslldq $10, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_6) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $6, %xmm3 + pslldq $10, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_6) + + .p2align 4 +LABEL(nibble_ashr_6): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xffc0, %edx + jnz LABEL(ashr_6_exittail) + +#ifdef USE_AS_STRNCMP + cmp $9, %r11 + jbe LABEL(ashr_6_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_6) + + .p2align 4 +LABEL(ashr_6_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $6, %xmm0 + psrldq $6, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_7 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(9~15) n - 9 6(15 +(n - 9) - n) ashr_7 + */ + .p2align 4 +LABEL(ashr_7): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $9, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $7, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 7(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_7): + add $16, %r10 + jg LABEL(nibble_ashr_7) + +LABEL(gobble_ashr_7): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $7, %xmm3 + pslldq $9, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_7) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $7, %xmm3 + pslldq $9, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_7) + + .p2align 4 +LABEL(nibble_ashr_7): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xff80, %edx + jnz LABEL(ashr_7_exittail) + +#ifdef USE_AS_STRNCMP + cmp $8, %r11 + jbe LABEL(ashr_7_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_7) + + .p2align 4 +LABEL(ashr_7_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $7, %xmm0 + psrldq $7, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_8 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(8~15) n - 8 7(15 +(n - 8) - n) ashr_8 + */ + .p2align 4 +LABEL(ashr_8): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $8, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $8, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 8(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_8): + add $16, %r10 + jg LABEL(nibble_ashr_8) + +LABEL(gobble_ashr_8): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $8, %xmm3 + pslldq $8, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_8) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $8, %xmm3 + pslldq $8, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_8) + + .p2align 4 +LABEL(nibble_ashr_8): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xff00, %edx + jnz LABEL(ashr_8_exittail) + +#ifdef USE_AS_STRNCMP + cmp $7, %r11 + jbe LABEL(ashr_8_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_8) + + .p2align 4 +LABEL(ashr_8_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $8, %xmm0 + psrldq $8, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_9 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(7~15) n - 7 8(15 +(n - 7) - n) ashr_9 + */ + .p2align 4 +LABEL(ashr_9): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $7, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $9, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 9(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_9): + add $16, %r10 + jg LABEL(nibble_ashr_9) + +LABEL(gobble_ashr_9): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $9, %xmm3 + pslldq $7, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_9) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $9, %xmm3 + pslldq $7, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 /* store for next cycle */ + jmp LABEL(loop_ashr_9) + + .p2align 4 +LABEL(nibble_ashr_9): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xfe00, %edx + jnz LABEL(ashr_9_exittail) + +#ifdef USE_AS_STRNCMP + cmp $6, %r11 + jbe LABEL(ashr_9_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_9) + + .p2align 4 +LABEL(ashr_9_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $9, %xmm0 + psrldq $9, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_10 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(6~15) n - 6 9(15 +(n - 6) - n) ashr_10 + */ + .p2align 4 +LABEL(ashr_10): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $6, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $10, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 10(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_10): + add $16, %r10 + jg LABEL(nibble_ashr_10) + +LABEL(gobble_ashr_10): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $10, %xmm3 + pslldq $6, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_10) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $10, %xmm3 + pslldq $6, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_10) + + .p2align 4 +LABEL(nibble_ashr_10): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xfc00, %edx + jnz LABEL(ashr_10_exittail) + +#ifdef USE_AS_STRNCMP + cmp $5, %r11 + jbe LABEL(ashr_10_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_10) + + .p2align 4 +LABEL(ashr_10_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $10, %xmm0 + psrldq $10, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_11 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(5~15) n - 5 10(15 +(n - 5) - n) ashr_11 + */ + .p2align 4 +LABEL(ashr_11): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $5, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $11, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 11(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_11): + add $16, %r10 + jg LABEL(nibble_ashr_11) + +LABEL(gobble_ashr_11): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $11, %xmm3 + pslldq $5, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_11) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $11, %xmm3 + pslldq $5, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_11) + + .p2align 4 +LABEL(nibble_ashr_11): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xf800, %edx + jnz LABEL(ashr_11_exittail) + +#ifdef USE_AS_STRNCMP + cmp $4, %r11 + jbe LABEL(ashr_11_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_11) + + .p2align 4 +LABEL(ashr_11_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $11, %xmm0 + psrldq $11, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_12 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(4~15) n - 4 11(15 +(n - 4) - n) ashr_12 + */ + .p2align 4 +LABEL(ashr_12): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $4, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $12, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 12(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_12): + add $16, %r10 + jg LABEL(nibble_ashr_12) + +LABEL(gobble_ashr_12): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $12, %xmm3 + pslldq $4, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_12) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $12, %xmm3 + pslldq $4, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_12) + + .p2align 4 +LABEL(nibble_ashr_12): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xf000, %edx + jnz LABEL(ashr_12_exittail) + +#ifdef USE_AS_STRNCMP + cmp $3, %r11 + jbe LABEL(ashr_12_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_12) + + .p2align 4 +LABEL(ashr_12_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $12, %xmm0 + psrldq $12, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_13 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(3~15) n - 3 12(15 +(n - 3) - n) ashr_13 + */ + .p2align 4 +LABEL(ashr_13): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $3, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $13, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 13(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_13): + add $16, %r10 + jg LABEL(nibble_ashr_13) + +LABEL(gobble_ashr_13): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $13, %xmm3 + pslldq $3, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_13) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $13, %xmm3 + pslldq $3, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_13) + + .p2align 4 +LABEL(nibble_ashr_13): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xe000, %edx + jnz LABEL(ashr_13_exittail) + +#ifdef USE_AS_STRNCMP + cmp $2, %r11 + jbe LABEL(ashr_13_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_13) + + .p2align 4 +LABEL(ashr_13_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $13, %xmm0 + psrldq $13, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_14 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(2~15) n - 2 13(15 +(n - 2) - n) ashr_14 + */ + .p2align 4 +LABEL(ashr_14): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $2, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $14, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 14(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_14): + add $16, %r10 + jg LABEL(nibble_ashr_14) + +LABEL(gobble_ashr_14): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $14, %xmm3 + pslldq $2, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_14) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $14, %xmm3 + pslldq $2, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_14) + + .p2align 4 +LABEL(nibble_ashr_14): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0xc000, %edx + jnz LABEL(ashr_14_exittail) + +#ifdef USE_AS_STRNCMP + cmp $1, %r11 + jbe LABEL(ashr_14_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_14) + + .p2align 4 +LABEL(ashr_14_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $14, %xmm0 + psrldq $14, %xmm3 + jmp LABEL(aftertail) + +/* + * The following cases will be handled by ashr_15 + * rcx(offset of rsi) rax(offset of rdi) relative offset corresponding case + * n(1~15) n - 1 14(15 +(n - 1) - n) ashr_15 + */ + .p2align 4 +LABEL(ashr_15): + pxor %xmm0, %xmm0 + movdqa (%rdi), %xmm2 + movdqa (%rsi), %xmm1 + pcmpeqb %xmm1, %xmm0 + pslldq $1, %xmm2 + pcmpeqb %xmm1, %xmm2 + psubb %xmm0, %xmm2 + pmovmskb %xmm2, %r9d + shr %cl, %edx + shr %cl, %r9d + sub %r9d, %edx + jnz LABEL(less32bytes) + + movdqa (%rdi), %xmm3 + + UPDATE_STRNCMP_COUNTER + + pxor %xmm0, %xmm0 + mov $16, %rcx /* index for loads */ + mov $15, %r9d /* byte position left over from less32bytes case */ + /* + * Setup %r10 value allows us to detect crossing a page boundary. + * When %r10 goes positive we have crossed a page boundary and + * need to do a nibble. + */ + lea 15(%rdi), %r10 + and $0xfff, %r10 /* offset into 4K page */ + + sub $0x1000, %r10 /* subtract 4K pagesize */ + + .p2align 4 +LABEL(loop_ashr_15): + add $16, %r10 + jg LABEL(nibble_ashr_15) + +LABEL(gobble_ashr_15): + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $15, %xmm3 + pslldq $1, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + + add $16, %r10 + jg LABEL(nibble_ashr_15) /* cross page boundary */ + + movdqa (%rsi, %rcx), %xmm1 + movdqa (%rdi, %rcx), %xmm2 + movdqa %xmm2, %xmm4 + + psrldq $15, %xmm3 + pslldq $1, %xmm2 + por %xmm3, %xmm2 + + pcmpeqb %xmm1, %xmm0 + pcmpeqb %xmm2, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + sub $0xffff, %edx + jnz LABEL(exit) + +#ifdef USE_AS_STRNCMP + sub $16, %r11 + jbe LABEL(strcmp_exitz) +#endif + + add $16, %rcx + movdqa %xmm4, %xmm3 + jmp LABEL(loop_ashr_15) + + .p2align 4 +LABEL(nibble_ashr_15): + pcmpeqb %xmm3, %xmm0 /* check nibble for null char */ + pmovmskb %xmm0, %edx + test $0x8000, %edx + jnz LABEL(ashr_15_exittail) + +#ifdef USE_AS_STRNCMP + test %r11, %r11 + je LABEL(ashr_15_exittail) +#endif + + pxor %xmm0, %xmm0 + sub $0x1000, %r10 + jmp LABEL(gobble_ashr_15) + + .p2align 4 +LABEL(ashr_15_exittail): + movdqa (%rsi, %rcx), %xmm1 + psrldq $15, %xmm3 + psrldq $15, %xmm0 + + .p2align 4 +LABEL(aftertail): + pcmpeqb %xmm3, %xmm1 + psubb %xmm0, %xmm1 + pmovmskb %xmm1, %edx + not %edx + + .p2align 4 +LABEL(exit): + lea -16(%r9, %rcx), %rax /* locate the exact offset for rdi */ +LABEL(less32bytes): + lea (%rdi, %rax), %rdi /* locate the exact address for first operand(rdi) */ + lea (%rsi, %rcx), %rsi /* locate the exact address for second operand(rsi) */ + test %r8d, %r8d + jz LABEL(ret) + xchg %rsi, %rdi /* recover original order according to flag(%r8d) */ + + .p2align 4 +LABEL(ret): +LABEL(less16bytes): + bsf %rdx, %rdx /* find and store bit index in %rdx */ + +#ifdef USE_AS_STRNCMP + sub %rdx, %r11 + jbe LABEL(strcmp_exitz) +#endif + movzbl (%rsi, %rdx), %ecx + movzbl (%rdi, %rdx), %eax + + sub %ecx, %eax + ret + +LABEL(strcmp_exitz): + xor %eax, %eax + ret + + .p2align 4 +LABEL(Byte0): + movzx (%rsi), %ecx + movzx (%rdi), %eax + + sub %ecx, %eax + ret +END (BP_SYM (STRCMP)) + + .section .rodata,"a",@progbits + .p2align 3 +LABEL(unaligned_table): + .int LABEL(ashr_1) - LABEL(unaligned_table) + .int LABEL(ashr_2) - LABEL(unaligned_table) + .int LABEL(ashr_3) - LABEL(unaligned_table) + .int LABEL(ashr_4) - LABEL(unaligned_table) + .int LABEL(ashr_5) - LABEL(unaligned_table) + .int LABEL(ashr_6) - LABEL(unaligned_table) + .int LABEL(ashr_7) - LABEL(unaligned_table) + .int LABEL(ashr_8) - LABEL(unaligned_table) + .int LABEL(ashr_9) - LABEL(unaligned_table) + .int LABEL(ashr_10) - LABEL(unaligned_table) + .int LABEL(ashr_11) - LABEL(unaligned_table) + .int LABEL(ashr_12) - LABEL(unaligned_table) + .int LABEL(ashr_13) - LABEL(unaligned_table) + .int LABEL(ashr_14) - LABEL(unaligned_table) + .int LABEL(ashr_15) - LABEL(unaligned_table) + .int LABEL(ashr_0) - LABEL(unaligned_table) +#endif /* NOT_IN_libc */ +libc_hidden_builtin_def (STRCMP) |