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x86_64: Always use builtin memcpy on gcc 4.3

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Jan asked to always use the builtin memcpy on gcc 4.3 mainline because
it should generate better code than the old macro. Let's try it.

Cc: Jan Hubicka <jh@suse.cz>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2007-07-21 17:09:58 +02:00 committed by Linus Torvalds
parent 5b74e3abb3
commit aac57f81eb
1 changed files with 4 additions and 1 deletions
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5
include/asm-x86_64/string.h
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@ -29,6 +29,9 @@ return (to);
function. */
#define __HAVE_ARCH_MEMCPY 1
#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
extern void *memcpy(void *to, const void *from, size_t len);
#else
extern void *__memcpy(void *to, const void *from, size_t len);
#define memcpy(dst,src,len) \
({ size_t __len = (len); \
@ -38,7 +41,7 @@ extern void *__memcpy(void *to, const void *from, size_t len);
else \
__ret = __builtin_memcpy((dst),(src),__len); \
__ret; })
#endif
#define __HAVE_ARCH_MEMSET
void *memset(void *s, int c, size_t n);