diff options
Diffstat (limited to 'sysdeps/i386/i486')
| -rw-r--r-- | sysdeps/i386/i486/bits/string.h | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/sysdeps/i386/i486/bits/string.h b/sysdeps/i386/i486/bits/string.h index 60148b7da5..2cbac1029c 100644 --- a/sysdeps/i386/i486/bits/string.h +++ b/sysdeps/i386/i486/bits/string.h @@ -742,10 +742,11 @@ __strcat_c (char *__dest, __const char __src[], size_t __srclen) register unsigned long int __d0; register char *__tmp; __asm__ __volatile__ - ("repne; cmpsb" - : "=S" (__tmp), "=&c" (__d0) + ("repne; scasb" + : "=D" (__tmp), "=&c" (__d0) : "0" (__dest), "1" (0xffffffff), "a" (0) : "cc"); + --__tmp; #else register char *__tmp = __dest - 1; __asm__ __volatile__ @@ -798,8 +799,27 @@ __strcat_g (char *__dest, __const char *__src) __STRING_INLINE char * __strncat_g (char *__dest, __const char __src[], size_t __n) { - register char *__tmp = __dest - 1; + register char *__tmp = __dest; register char __dummy; +#ifdef __i686__ + __asm__ __volatile__ + ("repne; scasb\n" + "decl %1\n\t" + "1:\n\t" + "decl %3\n\t" + "js 2f\n\t" + "movb (%2),%b0\n\t" + "movsb\n\t" + "testb %b0,%b0\n\t" + "jne 1b\n\t" + "decl %1\n" + "2:\n\t" + "movb $0,(%1)" + : "=&a" (__dummy), "=&D" (__tmp), "=&S" (__src), "=&r" (__n) + : "0" (0), "1" (__tmp), "2" (__src), "3" (__n) + : "memory", "cc"); +#else + --__tmp; __asm__ __volatile__ ("1:\n\t" "cmpb $0,1(%1)\n\t" @@ -816,10 +836,11 @@ __strncat_g (char *__dest, __const char __src[], size_t __n) "jne 2b\n\t" "decl %1\n" "3:\n\t" - "movb $0,(%1)\n\t" + "movb $0,(%1)" : "=&q" (__dummy), "=&r" (__tmp), "=&r" (__src), "=&r" (__n) : "1" (__tmp), "2" (__src), "3" (__n) : "memory", "cc"); +#endif return __dest; } |