From: "H.J. Lu" <hjl.tools@gmail.com>
To: Noah Goldstein <goldstein.w.n@gmail.com>
Cc: GNU C Library <libc-alpha@sourceware.org>,
"Carlos O'Donell" <carlos@systemhalted.org>
Subject: Re: [PATCH v1 2/4] x86: Move strcmp SSE2 implementation to multiarch/strcmp-sse2.S
Date: Tue, 12 Jul 2022 16:57:44 -0700 [thread overview]
Message-ID: <CAMe9rOo9fyixxjJ76bZT7hqMsguAvWSbtND8iHns19Ru4XOE6g@mail.gmail.com> (raw)
In-Reply-To: <20220712192808.335531-2-goldstein.w.n@gmail.com>
On Tue, Jul 12, 2022 at 12:28 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> This commit doesn't affect libc.so.6, its just housekeeping to prepare
> for adding explicit ISA level support.
>
> Because strcmp-sse2.S implements so many functions (more from
> avx2/evex/sse42) add a new file 'strcmp-naming.h' to assist in
> getting the correct symbol name for all the function across
> multiarch/non-multiarch builds.
>
> Tested build on x86_64 and x86_32 with/without multiarch.
> ---
> sysdeps/x86_64/multiarch/rtld-strcmp.S | 18 +
> sysdeps/x86_64/multiarch/rtld-strncmp.S | 18 +
> sysdeps/x86_64/multiarch/strcasecmp_l-sse2.S | 5 +-
> sysdeps/x86_64/multiarch/strcmp-naming.h | 68 +
> sysdeps/x86_64/multiarch/strcmp-sse2.S | 2140 ++++++++++++++++-
> sysdeps/x86_64/multiarch/strncase_l-sse2.S | 5 +-
> sysdeps/x86_64/multiarch/strncmp-sse2.S | 12 +-
> sysdeps/x86_64/strcasecmp_l.S | 11 +-
> sysdeps/x86_64/strcmp.S | 2147 +-----------------
> sysdeps/x86_64/strncase_l.S | 11 +-
> sysdeps/x86_64/strncmp.S | 7 +-
> 11 files changed, 2264 insertions(+), 2178 deletions(-)
> create mode 100644 sysdeps/x86_64/multiarch/rtld-strcmp.S
> create mode 100644 sysdeps/x86_64/multiarch/rtld-strncmp.S
> create mode 100644 sysdeps/x86_64/multiarch/strcmp-naming.h
>
> diff --git a/sysdeps/x86_64/multiarch/rtld-strcmp.S b/sysdeps/x86_64/multiarch/rtld-strcmp.S
> new file mode 100644
> index 0000000000..207078bdcc
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/rtld-strcmp.S
> @@ -0,0 +1,18 @@
> +/* Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + 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, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include "../strcmp.S"
> diff --git a/sysdeps/x86_64/multiarch/rtld-strncmp.S b/sysdeps/x86_64/multiarch/rtld-strncmp.S
> new file mode 100644
> index 0000000000..ac32150406
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/rtld-strncmp.S
> @@ -0,0 +1,18 @@
> +/* Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + 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, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include "../strncmp.S"
> diff --git a/sysdeps/x86_64/multiarch/strcasecmp_l-sse2.S b/sysdeps/x86_64/multiarch/strcasecmp_l-sse2.S
> index 2360d104dd..a2b5741399 100644
> --- a/sysdeps/x86_64/multiarch/strcasecmp_l-sse2.S
> +++ b/sysdeps/x86_64/multiarch/strcasecmp_l-sse2.S
> @@ -16,8 +16,5 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#define STRCMP __strcasecmp_l_sse2
> #define USE_AS_STRCASECMP_L
> -#define NO_NOLOCALE_ALIAS
> -#define __strcasecmp __strcasecmp_sse2
> -#include <sysdeps/x86_64/strcmp.S>
> +#include "strcmp-sse2.S"
> diff --git a/sysdeps/x86_64/multiarch/strcmp-naming.h b/sysdeps/x86_64/multiarch/strcmp-naming.h
> new file mode 100644
> index 0000000000..6a7529b6a4
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/strcmp-naming.h
> @@ -0,0 +1,68 @@
> +#ifndef _STRCMP_NAMING_H_
> +#define _STRCMP_NAMING_H_
> +
> +/* Utility macros. */
> +#define STRCMP_SUFFIX(x, y) x##y
> +#define STRCMP_NAME(x, y) STRCMP_SUFFIX (x, y)
> +
> +/* Setup base of all definitions. */
> +#define STRNCASECMP_BASE __strncasecmp
> +#define STRCASECMP_BASE __strcasecmp
> +#define WCSCMP_BASE __wcscmp
> +
> +#if defined USE_MULTIARCH && IS_IN (libc)
> +# define WCSNCMP_BASE __wcsncmp
> +# define STRNCMP_BASE __strncmp
> +# define STRCMP_BASE __strcmp
> +
> +#else
> +/* Covers IS_IN (rtld) or non-multiarch build. */
> +# define WCSNCMP_BASE wcsncmp
> +# define STRNCMP_BASE strncmp
> +# define STRCMP_BASE strcmp
> +
> +# undef STRCMP_ISA
> +# define STRCMP_ISA
> +#endif
> +
> +#if IS_IN (rtld) || defined USE_MULTIARCH
> +# define ISA_HIDDEN_JUMPTARGET(...) __VA_ARGS__
> +#else
> +# define ISA_HIDDEN_JUMPTARGET(...) HIDDEN_JUMPTARGET (__VA_ARGS__)
> +#endif
> +
> +/* Get correct symbol for OVERFLOW_STRCMP, STRCMP, and
> + STRCASECMP. */
> +#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> +
> +# if defined USE_AS_WCSCMP || defined USE_AS_WCSNCMP
> +# define OVERFLOW_STRCMP_SYM WCSCMP_BASE
> +# define STRCMP_SYM WCSNCMP_BASE
> +# elif defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> +# define OVERFLOW_STRCMP_SYM STRCMP_NAME (STRCASECMP_BASE, _l)
> +# define STRCMP_SYM STRCMP_NAME (STRNCASECMP_BASE, _l)
> +# else
> +# define OVERFLOW_STRCMP_SYM STRCMP_BASE
> +# define STRCMP_SYM STRNCMP_BASE
> +# endif
> +
> +# define STRCASECMP_SYM STRNCASECMP_BASE
> +# define OVERFLOW_STRCMP \
> + ISA_HIDDEN_JUMPTARGET (STRCMP_NAME (OVERFLOW_STRCMP_SYM, STRCMP_ISA))
> +#else
> +# ifdef USE_AS_WCSCMP
> +# define STRCMP_SYM WCSCMP_BASE
> +# elif defined USE_AS_STRCASECMP_L
> +# define STRCMP_SYM STRCMP_NAME (STRCASECMP_BASE, _l)
> +# else
> +# define STRCMP_SYM STRCMP_BASE
> +# endif
> +
> +# define STRCASECMP_SYM STRCASECMP_BASE
> +#endif
> +
> +#define STRCASECMP_L_NONASCII STRCMP_NAME (STRCASECMP_SYM, _l_nonascii)
> +#define STRCASECMP STRCMP_NAME (STRCASECMP_SYM, STRCMP_ISA)
> +#define STRCMP STRCMP_NAME (STRCMP_SYM, STRCMP_ISA)
> +
> +#endif
> diff --git a/sysdeps/x86_64/multiarch/strcmp-sse2.S b/sysdeps/x86_64/multiarch/strcmp-sse2.S
> index b8f95e59cf..b1220231ab 100644
> --- a/sysdeps/x86_64/multiarch/strcmp-sse2.S
> +++ b/sysdeps/x86_64/multiarch/strcmp-sse2.S
> @@ -16,13 +16,2141 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#if IS_IN (libc)
> +#if IS_IN (libc) || IS_IN (rtld)
> +
> +# define STRCMP_ISA _sse2
> +# include "strcmp-naming.h"
> +
> # include <sysdep.h>
>
> -# define STRCMP __strcmp_sse2
> +# undef UPDATE_STRNCMP_COUNTER
>
> -# undef libc_hidden_builtin_def
> -# define libc_hidden_builtin_def(strcmp)
> -#endif
> +# 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
> +
> +# elif defined USE_AS_STRCASECMP_L
> +# include "locale-defines.h"
> +
> +# define UPDATE_STRNCMP_COUNTER
> +# elif defined USE_AS_STRNCASECMP_L
> +# include "locale-defines.h"
> +
> +# 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
> +# endif
> +
> + .text
> +# ifdef USE_AS_STRCASECMP_L
> +# ifndef ENTRY2
> +# define ENTRY2(name) ENTRY (name)
> +# define END2(name) END (name)
> +# endif
> +
> +ENTRY2 (STRCASECMP)
> + movq __libc_tsd_LOCALE@gottpoff(%rip),%rax
> + mov %fs:(%rax),%RDX_LP
> +
> + /* Either 1 or 5 bytes (dependeing if CET is enabled). */
> + .p2align 4
> +END2 (STRCASECMP)
> + /* FALLTHROUGH to strcasecmp_l. */
> +# elif defined USE_AS_STRNCASECMP_L
> +# ifndef ENTRY2
> +# define ENTRY2(name) ENTRY (name)
> +# define END2(name) END (name)
> +# endif
> +
> +ENTRY2 (STRCASECMP)
> + movq __libc_tsd_LOCALE@gottpoff(%rip),%rax
> + mov %fs:(%rax),%RCX_LP
> +
> + /* Either 1 or 5 bytes (dependeing if CET is enabled). */
> + .p2align 4
> +END2 (STRCASECMP)
> + /* FALLTHROUGH to strncasecmp_l. */
> +# endif
> +
> +ENTRY (STRCMP)
> +# ifdef USE_AS_STRCASECMP_L
> + /* We have to fall back on the C implementation for locales
> + with encodings not matching ASCII for single bytes. */
> +# if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
> + mov LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rdx), %RAX_LP
> +# else
> + mov (%rdx), %RAX_LP
> +# endif
> + testl $1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
> + jne __strcasecmp_l_nonascii
> +# elif defined USE_AS_STRNCASECMP_L
> + /* We have to fall back on the C implementation for locales
> + with encodings not matching ASCII for single bytes. */
> +# if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
> + mov LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rcx), %RAX_LP
> +# else
> + mov (%rcx), %RAX_LP
> +# endif
> + testl $1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
> + jne __strncasecmp_l_nonascii
> +# endif
> +
> +/*
> + * This implementation uses SSE to compare up to 16 bytes at a time.
> + */
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + test %RDX_LP, %RDX_LP
> + je LABEL(strcmp_exitz)
> + cmp $1, %RDX_LP
> + je LABEL(Byte0)
> + mov %RDX_LP, %R11_LP
> +# 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 */
> +# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> + .section .rodata.cst16,"aM",@progbits,16
> + .align 16
> +.Llcase_min:
> + .quad 0x3f3f3f3f3f3f3f3f
> + .quad 0x3f3f3f3f3f3f3f3f
> +.Llcase_max:
> + .quad 0x9999999999999999
> + .quad 0x9999999999999999
> +.Lcase_add:
> + .quad 0x2020202020202020
> + .quad 0x2020202020202020
> + .previous
> + movdqa .Llcase_min(%rip), %xmm5
> +# define LCASE_MIN_reg %xmm5
> + movdqa .Llcase_max(%rip), %xmm6
> +# define LCASE_MAX_reg %xmm6
> + movdqa .Lcase_add(%rip), %xmm7
> +# define CASE_ADD_reg %xmm7
> +# endif
> + 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
> +# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> +# define TOLOWER(reg1, reg2) \
> + movdqa LCASE_MIN_reg, %xmm8; \
> + movdqa LCASE_MIN_reg, %xmm9; \
> + paddb reg1, %xmm8; \
> + paddb reg2, %xmm9; \
> + pcmpgtb LCASE_MAX_reg, %xmm8; \
> + pcmpgtb LCASE_MAX_reg, %xmm9; \
> + pandn CASE_ADD_reg, %xmm8; \
> + pandn CASE_ADD_reg, %xmm9; \
> + paddb %xmm8, reg1; \
> + paddb %xmm9, reg2
> + TOLOWER (%xmm1, %xmm2)
> +# else
> +# define TOLOWER(reg1, reg2)
> +# endif
> + 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 */
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + _CET_NOTRACK 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? */
> +# if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
> + pcmpeqb (%rdi), %xmm1 /* compare 16 bytes for equality */
> +# else
> + movdqa (%rdi), %xmm2
> + TOLOWER (%xmm1, %xmm2)
> + pcmpeqb %xmm2, %xmm1 /* compare 16 bytes for equality */
> +# endif
> + 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
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit) /* mismatch or null char seen */
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + sub $16, %r11
> + jbe LABEL(strcmp_exitz)
> +# endif
> + add $16, %rcx
> + movdqa (%rsi, %rcx), %xmm1
> + movdqa (%rdi, %rcx), %xmm2
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 */
> + TOLOWER (%xmm1, %xmm2)
> + 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 */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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*/
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + sub $16, %r11
> + jbe LABEL(strcmp_exitz)
> +# endif
>
> -#include <sysdeps/x86_64/strcmp.S>
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP | defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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
> + TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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 /* merge into one 16byte value */
> +
> + TOLOWER (%xmm1, %xmm2)
> +
> + pcmpeqb %xmm1, %xmm0
> + pcmpeqb %xmm2, %xmm1
> + psubb %xmm0, %xmm1
> + pmovmskb %xmm1, %edx
> + sub $0xffff, %edx
> + jnz LABEL(exit)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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)
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + 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):
> + TOLOWER (%xmm1, %xmm3)
> + 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 */
> +
> +# if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> + sub %rdx, %r11
> + jbe LABEL(strcmp_exitz)
> +# endif
> + movzbl (%rsi, %rdx), %ecx
> + movzbl (%rdi, %rdx), %eax
> +
> +# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> + leaq _nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
> + movl (%rdx,%rcx,4), %ecx
> + movl (%rdx,%rax,4), %eax
> +# endif
> +
> + sub %ecx, %eax
> + ret
> +
> +LABEL(strcmp_exitz):
> + xor %eax, %eax
> + ret
> +
> + .p2align 4
> +LABEL(Byte0):
> + movzbl (%rsi), %ecx
> + movzbl (%rdi), %eax
> +
> +# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> + leaq _nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
> + movl (%rdx,%rcx,4), %ecx
> + movl (%rdx,%rax,4), %eax
> +# endif
> +
> + sub %ecx, %eax
> + ret
> +END (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
> diff --git a/sysdeps/x86_64/multiarch/strncase_l-sse2.S b/sysdeps/x86_64/multiarch/strncase_l-sse2.S
> index 0ca4c836b2..fd8ad07450 100644
> --- a/sysdeps/x86_64/multiarch/strncase_l-sse2.S
> +++ b/sysdeps/x86_64/multiarch/strncase_l-sse2.S
> @@ -16,8 +16,5 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#define STRCMP __strncasecmp_l_sse2
> -#define NO_NOLOCALE_ALIAS
> #define USE_AS_STRNCASECMP_L
> -#define __strncasecmp __strncasecmp_sse2
> -#include <sysdeps/x86_64/strcmp.S>
> +#include "strcmp-sse2.S"
> diff --git a/sysdeps/x86_64/multiarch/strncmp-sse2.S b/sysdeps/x86_64/multiarch/strncmp-sse2.S
> index e3ba94f926..2152b8dc3d 100644
> --- a/sysdeps/x86_64/multiarch/strncmp-sse2.S
> +++ b/sysdeps/x86_64/multiarch/strncmp-sse2.S
> @@ -16,15 +16,5 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#include <sysdep.h>
> -
> -#if IS_IN (libc)
> -# define STRCMP __strncmp_sse2
> -# undef libc_hidden_builtin_def
> -# define libc_hidden_builtin_def(strcmp)
> -#else
> -# define STRCMP strncmp
> -#endif
> -
> #define USE_AS_STRNCMP
> -#include <sysdeps/x86_64/strcmp.S>
> +#include "strcmp-sse2.S"
> diff --git a/sysdeps/x86_64/strcasecmp_l.S b/sysdeps/x86_64/strcasecmp_l.S
> index 5456b3a49e..84fd7fdfd3 100644
> --- a/sysdeps/x86_64/strcasecmp_l.S
> +++ b/sysdeps/x86_64/strcasecmp_l.S
> @@ -1,6 +1,11 @@
> -#define STRCMP __strcasecmp_l
> -#define USE_AS_STRCASECMP_L
> -#include "strcmp.S"
> +/* Symbols = __strcasecmp_l and __strcasecmp. */
> +
> +#include "multiarch/strcasecmp_l-sse2.S"
> +
> +libc_hidden_builtin_def (__strcasecmp_l)
>
> weak_alias (__strcasecmp_l, strcasecmp_l)
> libc_hidden_def (strcasecmp_l)
> +
> +weak_alias (__strcasecmp, strcasecmp)
> +libc_hidden_def (__strcasecmp)
> diff --git a/sysdeps/x86_64/strcmp.S b/sysdeps/x86_64/strcmp.S
> index c38dc627f9..19e54bd3a7 100644
> --- a/sysdeps/x86_64/strcmp.S
> +++ b/sysdeps/x86_64/strcmp.S
> @@ -16,2148 +16,7 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> -#include <sysdep.h>
> -#include "asm-syntax.h"
> +/* Symbol = 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
> -
> -#elif defined USE_AS_STRCASECMP_L
> -# include "locale-defines.h"
> -
> -# define UPDATE_STRNCMP_COUNTER
> -#elif defined USE_AS_STRNCASECMP_L
> -# include "locale-defines.h"
> -
> -# 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
> -#ifdef USE_AS_STRCASECMP_L
> -# ifndef ENTRY2
> -# define ENTRY2(name) ENTRY (name)
> -# define END2(name) END (name)
> -# endif
> -
> -ENTRY2 (__strcasecmp)
> - movq __libc_tsd_LOCALE@gottpoff(%rip),%rax
> - mov %fs:(%rax),%RDX_LP
> -
> - /* Either 1 or 5 bytes (dependeing if CET is enabled). */
> - .p2align 4
> -END2 (__strcasecmp)
> -# ifndef NO_NOLOCALE_ALIAS
> -weak_alias (__strcasecmp, strcasecmp)
> -libc_hidden_def (__strcasecmp)
> -# endif
> - /* FALLTHROUGH to strcasecmp_l. */
> -#elif defined USE_AS_STRNCASECMP_L
> -# ifndef ENTRY2
> -# define ENTRY2(name) ENTRY (name)
> -# define END2(name) END (name)
> -# endif
> -
> -ENTRY2 (__strncasecmp)
> - movq __libc_tsd_LOCALE@gottpoff(%rip),%rax
> - mov %fs:(%rax),%RCX_LP
> -
> - /* Either 1 or 5 bytes (dependeing if CET is enabled). */
> - .p2align 4
> -END2 (__strncasecmp)
> -# ifndef NO_NOLOCALE_ALIAS
> -weak_alias (__strncasecmp, strncasecmp)
> -libc_hidden_def (__strncasecmp)
> -# endif
> - /* FALLTHROUGH to strncasecmp_l. */
> -#endif
> -
> -ENTRY (STRCMP)
> -#ifdef USE_AS_STRCASECMP_L
> - /* We have to fall back on the C implementation for locales
> - with encodings not matching ASCII for single bytes. */
> -# if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
> - mov LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rdx), %RAX_LP
> -# else
> - mov (%rdx), %RAX_LP
> -# endif
> - testl $1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
> - jne __strcasecmp_l_nonascii
> -#elif defined USE_AS_STRNCASECMP_L
> - /* We have to fall back on the C implementation for locales
> - with encodings not matching ASCII for single bytes. */
> -# if LOCALE_T___LOCALES != 0 || LC_CTYPE != 0
> - mov LOCALE_T___LOCALES+LC_CTYPE*LP_SIZE(%rcx), %RAX_LP
> -# else
> - mov (%rcx), %RAX_LP
> -# endif
> - testl $1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
> - jne __strncasecmp_l_nonascii
> -#endif
> -
> -/*
> - * This implementation uses SSE to compare up to 16 bytes at a time.
> - */
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - test %RDX_LP, %RDX_LP
> - je LABEL(strcmp_exitz)
> - cmp $1, %RDX_LP
> - je LABEL(Byte0)
> - mov %RDX_LP, %R11_LP
> -#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 */
> -#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> - .section .rodata.cst16,"aM",@progbits,16
> - .align 16
> -.Llcase_min:
> - .quad 0x3f3f3f3f3f3f3f3f
> - .quad 0x3f3f3f3f3f3f3f3f
> -.Llcase_max:
> - .quad 0x9999999999999999
> - .quad 0x9999999999999999
> -.Lcase_add:
> - .quad 0x2020202020202020
> - .quad 0x2020202020202020
> - .previous
> - movdqa .Llcase_min(%rip), %xmm5
> -# define LCASE_MIN_reg %xmm5
> - movdqa .Llcase_max(%rip), %xmm6
> -# define LCASE_MAX_reg %xmm6
> - movdqa .Lcase_add(%rip), %xmm7
> -# define CASE_ADD_reg %xmm7
> -#endif
> - 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
> -#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> -# define TOLOWER(reg1, reg2) \
> - movdqa LCASE_MIN_reg, %xmm8; \
> - movdqa LCASE_MIN_reg, %xmm9; \
> - paddb reg1, %xmm8; \
> - paddb reg2, %xmm9; \
> - pcmpgtb LCASE_MAX_reg, %xmm8; \
> - pcmpgtb LCASE_MAX_reg, %xmm9; \
> - pandn CASE_ADD_reg, %xmm8; \
> - pandn CASE_ADD_reg, %xmm9; \
> - paddb %xmm8, reg1; \
> - paddb %xmm9, reg2
> - TOLOWER (%xmm1, %xmm2)
> -#else
> -# define TOLOWER(reg1, reg2)
> -#endif
> - 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 */
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - _CET_NOTRACK 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? */
> -#if !defined USE_AS_STRCASECMP_L && !defined USE_AS_STRNCASECMP_L
> - pcmpeqb (%rdi), %xmm1 /* compare 16 bytes for equality */
> -#else
> - movdqa (%rdi), %xmm2
> - TOLOWER (%xmm1, %xmm2)
> - pcmpeqb %xmm2, %xmm1 /* compare 16 bytes for equality */
> -#endif
> - 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
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit) /* mismatch or null char seen */
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - sub $16, %r11
> - jbe LABEL(strcmp_exitz)
> -#endif
> - add $16, %rcx
> - movdqa (%rsi, %rcx), %xmm1
> - movdqa (%rdi, %rcx), %xmm2
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 */
> - TOLOWER (%xmm1, %xmm2)
> - 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 */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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*/
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP | defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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
> - TOLOWER (%xmm1, %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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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 /* merge into one 16byte value */
> -
> - TOLOWER (%xmm1, %xmm2)
> -
> - pcmpeqb %xmm1, %xmm0
> - pcmpeqb %xmm2, %xmm1
> - psubb %xmm0, %xmm1
> - pmovmskb %xmm1, %edx
> - sub $0xffff, %edx
> - jnz LABEL(exit)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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)
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - 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):
> - TOLOWER (%xmm1, %xmm3)
> - 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 */
> -
> -#if defined USE_AS_STRNCMP || defined USE_AS_STRNCASECMP_L
> - sub %rdx, %r11
> - jbe LABEL(strcmp_exitz)
> -#endif
> - movzbl (%rsi, %rdx), %ecx
> - movzbl (%rdi, %rdx), %eax
> -
> -#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> - leaq _nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
> - movl (%rdx,%rcx,4), %ecx
> - movl (%rdx,%rax,4), %eax
> -#endif
> -
> - sub %ecx, %eax
> - ret
> -
> -LABEL(strcmp_exitz):
> - xor %eax, %eax
> - ret
> -
> - .p2align 4
> -LABEL(Byte0):
> - movzbl (%rsi), %ecx
> - movzbl (%rdi), %eax
> -
> -#if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
> - leaq _nl_C_LC_CTYPE_tolower+128*4(%rip), %rdx
> - movl (%rdx,%rcx,4), %ecx
> - movl (%rdx,%rax,4), %eax
> -#endif
> -
> - sub %ecx, %eax
> - ret
> -END (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)
> -libc_hidden_builtin_def (STRCMP)
> +#include "multiarch/strcmp-sse2.S"
> +libc_hidden_builtin_def (strcmp)
> diff --git a/sysdeps/x86_64/strncase_l.S b/sysdeps/x86_64/strncase_l.S
> index c725cd85b3..3780fc50b1 100644
> --- a/sysdeps/x86_64/strncase_l.S
> +++ b/sysdeps/x86_64/strncase_l.S
> @@ -1,6 +1,11 @@
> -#define STRCMP __strncasecmp_l
> -#define USE_AS_STRNCASECMP_L
> -#include "strcmp.S"
> +/* Symbols = __strncasecmp_l and __strncasecmp. */
> +
> +#include "multiarch/strncase_l-sse2.S"
> +
> +libc_hidden_builtin_def (__strncasecmp_l)
>
> weak_alias (__strncasecmp_l, strncasecmp_l)
> libc_hidden_def (strncasecmp_l)
> +
> +weak_alias (__strncasecmp, strncasecmp)
> +libc_hidden_def (__strncasecmp)
> diff --git a/sysdeps/x86_64/strncmp.S b/sysdeps/x86_64/strncmp.S
> index 0af34e7f15..13d9e82ee2 100644
> --- a/sysdeps/x86_64/strncmp.S
> +++ b/sysdeps/x86_64/strncmp.S
> @@ -1,3 +1,4 @@
> -#define STRCMP strncmp
> -#define USE_AS_STRNCMP
> -#include "strcmp.S"
> +/* Symbol = strncmp. */
> +
> +#include "multiarch/strncmp-sse2.S"
> +libc_hidden_builtin_def (strncmp)
> --
> 2.34.1
>
LGTM.
Thanks.
--
H.J.
next prev parent reply other threads:[~2022-07-12 23:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 19:28 [PATCH v1 1/4] x86: Rename STRCASECMP_NONASCII macro to STRCASECMP_L_NONASCII Noah Goldstein
2022-07-12 19:28 ` [PATCH v1 2/4] x86: Move strcmp SSE2 implementation to multiarch/strcmp-sse2.S Noah Goldstein
2022-07-12 23:57 ` H.J. Lu [this message]
2022-07-12 19:28 ` [PATCH v1 3/4] x86: Move wcscmp SSE2 implementation to multiarch/wcscmp-sse2.S Noah Goldstein
2022-07-13 0:05 ` H.J. Lu
2022-07-12 19:28 ` [PATCH v1 4/4] x86: Move strcmp SSE42 implementation to multiarch/strcmp-sse4_2.S Noah Goldstein
2022-07-13 0:07 ` H.J. Lu
2022-07-12 23:30 ` [PATCH v1 1/4] x86: Rename STRCASECMP_NONASCII macro to STRCASECMP_L_NONASCII H.J. Lu
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