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

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Typical saving is 20-30 bytes in each file using strncmp().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-11-04 23:53:59 +00:00
parent f8ece72fc9
commit 06766875ad
2 changed files with 40 additions and 21 deletions
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23
src/arch/x86/include/bits/string.h
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@@ -230,27 +230,8 @@ return dest;
}
#define __HAVE_ARCH_STRNCMP
static inline int strncmp(const char * cs,const char * ct,size_t count)
{
register int __res;
int d0, d1, d2;
__asm__ __volatile__(
"1:\tdecl %3\n\t"
"js 2f\n\t"
"lodsb\n\t"
"scasb\n\t"
"jne 3f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n"
"2:\txorl %%eax,%%eax\n\t"
"jmp 4f\n"
"3:\tsbbl %%eax,%%eax\n\t"
"orb $1,%%al\n"
"4:"
:"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2)
:"1" (cs),"2" (ct),"3" (count));
return __res;
}
extern int strncmp ( const char *str1, const char *str2, size_t len );
#define __HAVE_ARCH_STRLEN
static inline size_t strlen(const char * s)