linux-kernel - [PATCH] [9/58] x86_64: Always use builtin memcpy on gcc 4.3

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Date:	Thu, 19 Jul 2007 11:54:53 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	jh@...e.cz, patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [9/58] x86_64: Always use builtin memcpy on gcc 4.3


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: jh@...e.cz

Signed-off-by: Andi Kleen <ak@...e.de>

---
 include/asm-x86_64/string.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux/include/asm-x86_64/string.h
===================================================================
--- linux.orig/include/asm-x86_64/string.h
+++ linux/include/asm-x86_64/string.h
@@ -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 vo
 	   else							\
 		 __ret = __builtin_memcpy((dst),(src),__len);	\
 	   __ret; }) 
-
+#endif
 
 #define __HAVE_ARCH_MEMSET
 void *memset(void *s, int c, size_t n);
-
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