From 1edad85b16fdda43c8ab809e2779e8bf64ab8bb2 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 26 Mar 2009 15:24:37 +0100 Subject: [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 Signed-off-by: Martin Schwidefsky --- arch/s390/lib/string.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/s390/lib') diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c index ae5cf5d03d4..4143b7c1909 100644 --- a/arch/s390/lib/string.c +++ b/arch/s390/lib/string.c @@ -44,7 +44,11 @@ static inline char *__strnend(const char *s, size_t n) */ size_t strlen(const char *s) { +#if __GNUC__ < 4 return __strend(s) - s; +#else + return __builtin_strlen(s); +#endif } EXPORT_SYMBOL(strlen); @@ -70,6 +74,7 @@ EXPORT_SYMBOL(strnlen); */ char *strcpy(char *dest, const char *src) { +#if __GNUC__ < 4 register int r0 asm("0") = 0; char *ret = dest; @@ -78,6 +83,9 @@ char *strcpy(char *dest, const char *src) : "+&a" (dest), "+&a" (src) : "d" (r0) : "cc", "memory" ); return ret; +#else + return __builtin_strcpy(dest, src); +#endif } EXPORT_SYMBOL(strcpy); -- cgit v1.2.3