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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-03-26 15:24:37 +0100 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-03-26 15:24:24 +0100 |
commit | 1edad85b16fdda43c8ab809e2779e8bf64ab8bb2 (patch) | |
tree | 45e777718c8fda461c2232f2b74b8dc0a04e4ea6 /arch/s390/lib | |
parent | 504665a91498f43d220b7d0942281067283a35f7 (diff) | |
download | kernel_samsung_smdk4412-1edad85b16fdda43c8ab809e2779e8bf64ab8bb2.zip kernel_samsung_smdk4412-1edad85b16fdda43c8ab809e2779e8bf64ab8bb2.tar.gz kernel_samsung_smdk4412-1edad85b16fdda43c8ab809e2779e8bf64ab8bb2.tar.bz2 |
[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/lib')
-rw-r--r-- | arch/s390/lib/string.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/lib/string.c b/arch/s390/lib/string.c index ae5cf5d..4143b7c 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); |