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[libc] Reduce overall code size by externalising strlen()

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Typical saving is 5-20 bytes in each file using strlen().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-11-05 00:25:25 +00:00
parent 06766875ad
commit de20c526e6
2 changed files with 20 additions and 12 deletions
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14
src/arch/x86/include/bits/string.h
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@@ -234,17 +234,7 @@ return dest;
extern int strncmp ( const char *str1, const char *str2, size_t len );
#define __HAVE_ARCH_STRLEN
static inline size_t strlen(const char * s)
{
int d0;
register int __res;
__asm__ __volatile__(
"repne\n\t"
"scasb\n\t"
"notl %0\n\t"
"decl %0"
:"=c" (__res), "=&D" (d0) :"1" (s),"a" (0), "0" (0xffffffff));
return __res;
}
extern size_t strlen ( const char *string );
#endif /* ETHERBOOT_BITS_STRING_H */