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Improve performance of mempcpy by inlining and using memcpy. Enable 

this for all targets except sparc which has an optimized mempcpy
implementation.
This commit is contained in:
Wilco Dijkstra 2015-08-05 15:58:15 +01:00
parent f29ac72eff
commit 05a910f7b4
3 changed files with 28 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-08-05 Wilco Dijkstra <wdijkstr@arm.com>
* string/string.h: (mempcpy): Redirect to __mempcpy_inline.
(__mempcpy): Likewise. (__mempcpy_inline): New inline function.
* sysdeps/sparc/bits/string.h: (_HAVE_STRING_ARCH_mempcpy): Define.
2015-08-05 Wilco Dijkstra <wdijkstr@arm.com>
* string/memccpy.c (memccpy):

19
string/string.h
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@ -636,6 +636,25 @@ extern char *basename (const char *__filename) __THROW __nonnull ((1));
# endif
#endif
#if defined __USE_GNU && defined __OPTIMIZE__ \
&& defined __extern_always_inline && __GNUC_PREREQ (3,2)
# if !defined _FORCE_INLINES && !defined _HAVE_STRING_ARCH_mempcpy
#undef mempcpy
#undef __mempcpy
#define mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
#define __mempcpy(dest, src, n) __mempcpy_inline (dest, src, n)
__extern_always_inline void *
__mempcpy_inline (void *__restrict __dest,
const void *__restrict __src, size_t __n)
{
return (char *) memcpy (__dest, __src, __n) + __n;
}
# endif
#endif
__END_DECLS
#endif /* string.h */

3
sysdeps/sparc/bits/string.h
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@ -26,3 +26,6 @@
/* sparc32 and sparc64 strchr(x, '\0') perform better than
__rawmemchr(x, '\0'). */
#define _HAVE_STRING_ARCH_strchr 1
/* Don't inline mempcpy into memcpy as sparc has an optimized mempcpy. */
#define _HAVE_STRING_ARCH_mempcpy 1