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x86-64 SSE4 optimized memcmp

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This is 64bit SSE4 optimized memcmp. It improves memcmp by upto 3X
on Intel Core i7.
This commit is contained in:
H.J. Lu 2010-04-14 00:12:53 -07:00 committed by Ulrich Drepper
parent bbbdd77809
commit 404a6e3201
5 changed files with 1339 additions and 1 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2010-04-12 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
memcmp-sse4.
* sysdeps/x86_64/multiarch/memcmp-sse4.S: New file.
* sysdeps/x86_64/multiarch/memcmp.S: New file.
* sysdeps/x86_64/multiarch/rtld-memcmp.c: New file.
2010-04-13 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/multiarch/init-arch.h: Pretty printing.

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sysdeps/x86_64/multiarch/Makefile
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@ -5,7 +5,7 @@ endif
ifeq ($(subdir),string)
sysdep_routines += stpncpy-c strncpy-c strcmp-ssse3 strncmp-ssse3 \
strend-sse4
strend-sse4 memcmp-sse4
ifeq (yes,$(config-cflags-sse4))
sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c
CFLAGS-strcspn-c.c += -msse4

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sysdeps/x86_64/multiarch/memcmp-sse4.S Normal file
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59
sysdeps/x86_64/multiarch/memcmp.S Normal file
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/* Multiple versions of memcmp
Copyright (C) 2010 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <init-arch.h>
/* Define multiple versions only for the definition in libc. */
#ifndef NOT_IN_libc
.text
ENTRY(memcmp)
.type memcmp, @gnu_indirect_function
cmpl $0, KIND_OFFSET+__cpu_features(%rip)
jne 1f
call __init_cpu_features
1: leaq __memcmp_sse2(%rip), %rax
testl $bit_SSE4_1, __cpu_features+CPUID_OFFSET+index_SSE4_1(%rip)
jz 2f
leaq __memcmp_sse4_1(%rip), %rax
2: ret
END(memcmp)
# undef ENTRY
# define ENTRY(name) \
.type __memcmp_sse2, @function; \
.p2align 4; \
__memcmp_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2
# ifdef SHARED
# undef libc_hidden_builtin_def
/* IFUNC doesn't work with the hidden functions in shared library since
they will be called without setting up EBX needed for PLT which is
used by IFUNC. */
# define libc_hidden_builtin_def(name) \
.globl __GI_memcmp; __GI_memcmp = __memcmp_sse2
# endif
#endif
#include "../memcmp.S"

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sysdeps/x86_64/multiarch/rtld-memcmp.c Normal file
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#include "../rtld-memcmp.c"