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/* strcmp with SSE4.2
Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
Contributed by Intel Corporation.
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
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <init-arch.h>
#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
# define STRCMP_SSE42 __strncmp_sse42
# define STRCMP_SSSE3 __strncmp_ssse3
# define STRCMP_SSE2 __strncmp_sse2
# define __GI_STRCMP __GI_strncmp
#elif defined USE_AS_STRCASECMP_L
# include "locale-defines.h"
# define UPDATE_STRNCMP_COUNTER
# define STRCMP_AVX __strcasecmp_l_avx
# define STRCMP_SSE42 __strcasecmp_l_sse42
# define STRCMP_SSSE3 __strcasecmp_l_ssse3
# define STRCMP_SSE2 __strcasecmp_l_sse2
# define __GI_STRCMP __GI___strcasecmp_l
#elif defined USE_AS_STRNCASECMP_L
# include "locale-defines.h"
/* 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
# define STRCMP_AVX __strncasecmp_l_avx
# define STRCMP_SSE42 __strncasecmp_l_sse42
# define STRCMP_SSSE3 __strncasecmp_l_ssse3
# define STRCMP_SSE2 __strncasecmp_l_sse2
# define __GI_STRCMP __GI___strncasecmp_l
#else
# define UPDATE_STRNCMP_COUNTER
# ifndef STRCMP
# define STRCMP strcmp
# define STRCMP_SSE42 __strcmp_sse42
# define STRCMP_SSSE3 __strcmp_ssse3
# define STRCMP_SSE2 __strcmp_sse2
# define __GI_STRCMP __GI_strcmp
# endif
#endif
/* Define multiple versions only for the definition in libc. Don't
define multiple versions for strncmp in static library since we
need strncmp before the initialization happened. */
#if (defined SHARED || !defined USE_AS_STRNCMP) && !defined NOT_IN_libc
.text
ENTRY(STRCMP)
.type STRCMP, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1:
leaq STRCMP_SSE42(%rip), %rax
testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
jnz 2f
leaq STRCMP_SSSE3(%rip), %rax
testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
jnz 2f
leaq STRCMP_SSE2(%rip), %rax
2: ret
END(STRCMP)
# ifdef USE_AS_STRCASECMP_L
ENTRY(__strcasecmp)
.type __strcasecmp, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1:
# ifdef HAVE_AVX_SUPPORT
leaq __strcasecmp_avx(%rip), %rax
testl $bit_AVX, __cpu_features+CPUID_OFFSET+index_AVX(%rip)
jnz 2f
# endif
leaq __strcasecmp_sse42(%rip), %rax
testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
jnz 2f
leaq __strcasecmp_ssse3(%rip), %rax
testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
jnz 2f
leaq __strcasecmp_sse2(%rip), %rax
2: ret
END(__strcasecmp)
weak_alias (__strcasecmp, strcasecmp)
# endif
# ifdef USE_AS_STRNCASECMP_L
ENTRY(__strncasecmp)
.type __strncasecmp, @gnu_indirect_function
cmpl $0, __cpu_features+KIND_OFFSET(%rip)
jne 1f
call __init_cpu_features
1:
# ifdef HAVE_AVX_SUPPORT
leaq __strncasecmp_avx(%rip), %rax
testl $bit_AVX, __cpu_features+CPUID_OFFSET+index_AVX(%rip)
jnz 2f
# endif
leaq __strncasecmp_sse42(%rip), %rax
testl $bit_SSE4_2, __cpu_features+CPUID_OFFSET+index_SSE4_2(%rip)
jnz 2f
leaq __strncasecmp_ssse3(%rip), %rax
testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
jnz 2f
leaq __strncasecmp_sse2(%rip), %rax
2: ret
END(__strncasecmp)
weak_alias (__strncasecmp, strncasecmp)
# endif
# undef LABEL
# define LABEL(l) .L##l##_sse42
# define GLABEL(l) l##_sse42
# define SECTION sse4.2
# include "strcmp-sse42.S"
# ifdef HAVE_AVX_SUPPORT
# if defined USE_AS_STRCASECMP_L || defined USE_AS_STRNCASECMP_L
# define LABEL(l) .L##l##_avx
# define GLABEL(l) l##_avx
# define USE_AVX 1
# undef STRCMP_SSE42
# define STRCMP_SSE42 STRCMP_AVX
# define SECTION avx
# include "strcmp-sse42.S"
# endif
# endif
# undef ENTRY
# define ENTRY(name) \
.type STRCMP_SSE2, @function; \
.align 16; \
STRCMP_SSE2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size STRCMP_SSE2, .-STRCMP_SSE2
# ifdef USE_AS_STRCASECMP_L
# define ENTRY2(name) \
.type __strcasecmp_sse2, @function; \
.align 16; \
__strcasecmp_sse2: cfi_startproc; \
CALL_MCOUNT
# define END2(name) \
cfi_endproc; .size __strcasecmp_sse2, .-__strcasecmp_sse2
# endif
# ifdef USE_AS_STRNCASECMP_L
# define ENTRY2(name) \
.type __strncasecmp_sse2, @function; \
.align 16; \
__strncasecmp_sse2: cfi_startproc; \
CALL_MCOUNT
# define END2(name) \
cfi_endproc; .size __strncasecmp_sse2, .-__strncasecmp_sse2
# endif
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal strcmp calls through a PLT.
The speedup we get from using SSE4.2 instruction is likely eaten away
by the indirect call in the PLT. */
# define libc_hidden_builtin_def(name) \
.globl __GI_STRCMP; __GI_STRCMP = STRCMP_SSE2
#endif
#include "../strcmp.S"
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