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* [glibc] x86: Move strcmp SSE2 implementation to multiarch/strcmp-sse2.S
@ 2022-07-13 22:54 Noah Goldstein
0 siblings, 0 replies; only message in thread
From: Noah Goldstein @ 2022-07-13 22:54 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d561fbb041fe6aa205f652aecefe4bb84fd124a5
commit d561fbb041fe6aa205f652aecefe4bb84fd124a5
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Tue Jul 12 12:28:06 2022 -0700
x86: Move strcmp SSE2 implementation to multiarch/strcmp-sse2.S
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.
Diff:
---
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(-)
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)
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2022-07-13 22:54 [glibc] x86: Move strcmp SSE2 implementation to multiarch/strcmp-sse2.S Noah Goldstein
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