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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-03-26 15:24:37 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-03-26 15:24:24 +0100
commit1edad85b16fdda43c8ab809e2779e8bf64ab8bb2 (patch)
tree45e777718c8fda461c2232f2b74b8dc0a04e4ea6 /arch/s390/include/asm/string.h
parent504665a91498f43d220b7d0942281067283a35f7 (diff)
[S390] use compiler builtin versions of strlen/strcpy/strcat
Use builtin variants if gcc 4 or newer is used to compile the kernel. Generates better code than the asm variants. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/string.h')
-rw-r--r--arch/s390/include/asm/string.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/include/asm/string.h b/arch/s390/include/asm/string.h
index adf079170aa6..cd0241db5a46 100644
--- a/arch/s390/include/asm/string.h
+++ b/arch/s390/include/asm/string.h
@@ -100,6 +100,7 @@ static inline char *strcat(char *dst, const char *src)
static inline char *strcpy(char *dst, const char *src)
{
+#if __GNUC__ < 4
register int r0 asm("0") = 0;
char *ret = dst;
@@ -109,10 +110,14 @@ static inline char *strcpy(char *dst, const char *src)
: "+&a" (dst), "+&a" (src) : "d" (r0)
: "cc", "memory");
return ret;
+#else
+ return __builtin_strcpy(dst, src);
+#endif
}
static inline size_t strlen(const char *s)
{
+#if __GNUC__ < 4
register unsigned long r0 asm("0") = 0;
const char *tmp = s;
@@ -121,6 +126,9 @@ static inline size_t strlen(const char *s)
" jo 0b"
: "+d" (r0), "+a" (tmp) : : "cc");
return r0 - (unsigned long) s;
+#else
+ return __builtin_strlen(s);
+#endif
}
static inline size_t strnlen(const char * s, size_t n)

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