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SSSE3 strcpy/stpcpy for x86-64

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This patch adds SSSE3 strcpy/stpcpy. I got up to 4X speed up on Core 2
and Core i7.  I disabled it on Atom since SSSE3 version is slower for
shorter (<64byte) data.
This commit is contained in:
H.J. Lu
2009-07-02 03:39:03 -07:00
committed by Ulrich Drepper
parent 6cbbaa50aa
commit ab6a873fe0
10 changed files with 1982 additions and 12 deletions
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19
ChangeLog
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@ -1,3 +1,22 @@
2009-06-30 H.J. Lu <hongjiu.lu@intel.com>
* string/stpncpy.c (STPNCPY): New. Defined if not defined.
(__stpncpy): Renamed to ...
(STPNCPY): This.
(stpncpy): Create alias only if STPNCPY is not defined.
* string/strncpy.c (STRNCPY): New. Defined to strncpy if not
defined.
(strncpy): Renamed to ...
(STRNCPY): This.
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
stpncpy-c strncpy-c for string.
* sysdeps/x86_64/multiarch/stpcpy.S: New file.
* sysdeps/x86_64/multiarch/stpncpy-c.c: New file.
* sysdeps/x86_64/multiarch/stpncpy.S: New file.
* sysdeps/x86_64/multiarch/strcpy.S: New file.
* sysdeps/x86_64/multiarch/strncpy-c.c: New file.
* sysdeps/x86_64/multiarch/strncpy.S: New file.
2009-07-02 Ulrich Drepper <drepper@redhat.com>
* malloc/malloc.c [ATOMIC_FASTBINS] (_int_free): Add full barrier when

15
string/stpncpy.c
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@ -28,17 +28,19 @@
# include <sys/types.h>
#endif
#ifndef weak_alias
# define __stpncpy stpncpy
#ifndef STPNCPY
# ifdef weak_alias
# define STPNCPY __stpncpy
weak_alias (__stpncpy, stpncpy)
# else
# define STPNCPY stpncpy
# endif
#endif
/* Copy no more than N characters of SRC to DEST, returning the address of
the terminating '\0' in DEST, if any, or else DEST + N. */
char *
__stpncpy (dest, src, n)
char *dest;
const char *src;
size_t n;
STPNCPY (char *dest, const char *src, size_t n)
{
char c;
char *s = dest;
@ -96,5 +98,4 @@ __stpncpy (dest, src, n)
}
#ifdef weak_alias
libc_hidden_def (__stpncpy)
weak_alias (__stpncpy, stpncpy)
#endif

9
string/strncpy.c
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@ -21,11 +21,12 @@
#undef strncpy
#ifndef STRNCPY
#define STRNCPY strncpy
#endif
char *
strncpy (s1, s2, n)
char *s1;
const char *s2;
size_t n;
STRNCPY (char *s1, const char *s2, size_t n)
{
reg_char c;
char *s = s1;

2
sysdeps/x86_64/multiarch/Makefile
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@ -4,5 +4,5 @@ gen-as-const-headers += ifunc-defines.sym
endif
ifeq ($(subdir),string)
sysdep_routines += strncmp-c
sysdep_routines += stpncpy-c strncpy-c strncmp-c
endif

7
sysdeps/x86_64/multiarch/stpcpy.S Normal file
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@ -0,0 +1,7 @@
#define USE_AS_STPCPY
#define STRCPY __stpcpy
#include "strcpy.S"
weak_alias (__stpcpy, stpcpy)
libc_hidden_def (__stpcpy)
libc_hidden_builtin_def (stpcpy)

8
sysdeps/x86_64/multiarch/stpncpy-c.c Normal file
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@ -0,0 +1,8 @@
#define STPNCPY __stpncpy_sse2
#ifdef SHARED
#undef libc_hidden_def
#define libc_hidden_def(name) \
__hidden_ver1 (__stpncpy_sse2, __GI___stpncpy, __stpncpy_sse2);
#endif
#include "stpncpy.c"

6
sysdeps/x86_64/multiarch/stpncpy.S Normal file
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@ -0,0 +1,6 @@
#define STRCPY __stpncpy
#define USE_AS_STPCPY
#define USE_AS_STRNCPY
#include "strcpy.S"
weak_alias (__stpncpy, stpncpy)

1917
sysdeps/x86_64/multiarch/strcpy.S Normal file
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File diff suppressed because it is too large Load Diff

8
sysdeps/x86_64/multiarch/strncpy-c.c Normal file
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@ -0,0 +1,8 @@
#define STRNCPY __strncpy_sse2
#ifdef SHARED
#undef libc_hidden_builtin_def
#define libc_hidden_builtin_def(name) \
__hidden_ver1 (__strncpy_sse2, __GI_strncpy, __strncpy_sse2);
#endif
#include "strncpy.c"

3
sysdeps/x86_64/multiarch/strncpy.S Normal file
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@ -0,0 +1,3 @@
#define STRCPY strncpy
#define USE_AS_STRNCPY
#include "strcpy.S"