OpenE2K
/
glibc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
glibc/sysdeps/i386/bits/string.h

905 lines
22 KiB
C
Raw Blame History

/* Optimized, inlined string functions. i386 version.
Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _STRING_H
# error "Never use <bits/string.h> directly; include <string.h> instead."
#endif
/* The ix86 processors can access unaligned multi-byte variables. */
#define _STRING_ARCH_unaligned 1
/* We only provide optimizations if the user selects them and if
GNU CC is used. */
#if !defined __NO_STRING_INLINES && defined __USE_STRING_INLINES \
&& defined __GNUC__ && __GNUC__ >= 2 && !__BOUNDED_POINTERS__
#ifndef __STRING_INLINE
# ifdef __cplusplus
# define __STRING_INLINE inline
# else
# define __STRING_INLINE extern __inline
# endif
#endif
/* Copy N bytes of SRC to DEST. */
#define _HAVE_STRING_ARCH_memcpy 1
#define memcpy(dest, src, n) \
(__extension__ (__builtin_constant_p (n) \
? __memcpy_c (dest, src, n) \
: memcpy (dest, src, n)))
/* This looks horribly ugly, but the compiler can optimize it totally,
as the count is constant. */
__STRING_INLINE void *__memcpy_c (void *__dest, __const void *__src,
size_t __n);
__STRING_INLINE void *
__memcpy_c (void *__dest, __const void *__src, size_t __n)
{
register unsigned long int __d0, __d1, __d2;
union {
unsigned int __ui;
unsigned short int __usi;
unsigned char __uc;
} *__u = __dest;
switch (__n)
{
case 0:
return __dest;
case 1:
__u->__uc = *(const unsigned char *) __src;
return __dest;
case 2:
__u->__usi = *(const unsigned short int *) __src;
return __dest;
case 3:
__u->__usi = *(const unsigned short int *) __src;
__u = (void *) __u + 2;
__u->__uc = *(2 + (const unsigned char *) __src);
return __dest;
case 4:
__u->__ui = *(const unsigned int *) __src;
return __dest;
case 6:
__u->__ui = *(const unsigned int *) __src;
__u = (void *) __u + 4;
__u->__usi = *(2 + (const unsigned short int *) __src);
return __dest;
case 8:
__u->__ui = *(const unsigned int *) __src;
__u = (void *) __u + 4;
__u->__ui = *(1 + (const unsigned int *) __src);
return __dest;
case 12:
__u->__ui = *(const unsigned int *) __src;
__u = (void *) __u + 4;
__u->__ui = *(1 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(2 + (const unsigned int *) __src);
return __dest;
case 16:
__u->__ui = *(const unsigned int *) __src;
__u = (void *) __u + 4;
__u->__ui = *(1 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(2 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(3 + (const unsigned int *) __src);
return __dest;
case 20:
__u->__ui = *(const unsigned int *) __src;
__u = (void *) __u + 4;
__u->__ui = *(1 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(2 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(3 + (const unsigned int *) __src);
__u = (void *) __u + 4;
__u->__ui = *(4 + (const unsigned int *) __src);
return __dest;
}
#define __COMMON_CODE(x) \
__asm__ __volatile__ \
("cld\n\t" \
"rep; movsl" \
x \
: "=&c" (__d0), "=&D" (__d1), "=&S" (__d2) \
: "0" (__n / 4), "1" (&__u->__uc), "2" (__src) \
: "memory");
switch (__n % 4)
{
case 0:
__COMMON_CODE ("");
break;
case 1:
__COMMON_CODE ("\n\tmovsb");
break;
case 2:
__COMMON_CODE ("\n\tmovsw");
break;
case 3:
__COMMON_CODE ("\n\tmovsw\n\tmovsb");
break;
}
return __dest;
#undef __COMMON_CODE
}
/* Copy N bytes of SRC to DEST, guaranteeing
correct behavior for overlapping strings. */
#define _HAVE_STRING_ARCH_memmove 1
#ifndef _FORCE_INLINES
__STRING_INLINE void *
memmove (void *__dest, __const void *__src, size_t __n)
{
register unsigned long int __d0, __d1, __d2;
if (__dest < __src)
__asm__ __volatile__
("cld\n\t"
"rep\n\t"
"movsb"
: "=&c" (__d0), "=&S" (__d1), "=&D" (__d2)
: "0" (__n), "1" (__src), "2" (__dest)
: "memory");
else
__asm__ __volatile__
("std\n\t"
"rep\n\t"
"movsb\n\t"
"cld"
: "=&c" (__d0), "=&S" (__d1), "=&D" (__d2)
: "0" (__n), "1" (__n - 1 + (const char *) __src),
"2" (__n - 1 + (char *) __dest)
: "memory");
return __dest;
}
#endif
/* Set N bytes of S to C. */
#define _HAVE_STRING_ARCH_memset 1
#define _USE_STRING_ARCH_memset 1
#define memset(s, c, n) \
(__extension__ (__builtin_constant_p (c) \
? (__builtin_constant_p (n) \
? __memset_cc (s, 0x01010101UL * (unsigned char) (c), n) \
: __memset_cg (s, 0x01010101UL * (unsigned char) (c), n))\
: __memset_gg (s, c, n)))
__STRING_INLINE void *__memset_cc (void *__s, unsigned long int __pattern,
size_t __n);
__STRING_INLINE void *
__memset_cc (void *__s, unsigned long int __pattern, size_t __n)
{
register unsigned long int __d0, __d1;
union {
unsigned int __ui;
unsigned short int __usi;
unsigned char __uc;
} *__u = __s;
switch (__n)
{
case 0:
return __s;
case 1:
__u->__uc = __pattern;
return __s;
case 2:
__u->__usi = __pattern;
return __s;
case 3:
__u->__usi = __pattern;
__u = __extension__ ((void *) __u + 2);
__u->__uc = __pattern;
return __s;
case 4:
__u->__ui = __pattern;
return __s;
}
#define __COMMON_CODE(x) \
__asm__ __volatile__ \
("cld\n\t" \
"rep; stosl" \
x \
: "=&c" (__d0), "=&D" (__d1) \
: "a" (__pattern), "0" (__n / 4), "1" (&__u->__uc) \
: "memory")
switch (__n % 4)
{
case 0:
__COMMON_CODE ("");
break;
case 1:
__COMMON_CODE ("\n\tstosb");
break;
case 2:
__COMMON_CODE ("\n\tstosw");
break;
case 3:
__COMMON_CODE ("\n\tstosw\n\tstosb");
break;
}
return __s;
#undef __COMMON_CODE
}
__STRING_INLINE void *__memset_cg (void *__s, unsigned long __c, size_t __n);
__STRING_INLINE void *
__memset_cg (void *__s, unsigned long __c, size_t __n)
{
register unsigned long int __d0, __d1;
__asm__ __volatile__
("cld\n\t"
"rep; stosl\n\t"
"testb $2,%b3\n\t"
"je 1f\n\t"
"stosw\n"
"1:\n\t"
"testb $1,%b3\n\t"
"je 2f\n\t"
"stosb\n"
"2:"
: "=&c" (__d0), "=&D" (__d1)
: "a" (__c), "q" (__n), "0" (__n / 4), "1" (__s)
: "memory");
return __s;
}
__STRING_INLINE void *__memset_gg (void *__s, char __c, size_t __n);
__STRING_INLINE void *
__memset_gg (void *__s, char __c, size_t __n)
{
register unsigned long int __d0, __d1;
__asm__ __volatile__
("cld\n\t"
"rep; stosb"
: "=&D" (__d0), "=&c" (__d1)
: "a" (__c), "0" (__s), "1" (__n)
: "memory");
return __s;
}
/* Search N bytes of S for C. */
#define _HAVE_STRING_ARCH_memchr 1
#ifndef _FORCE_INLINES
__STRING_INLINE void *
memchr (__const void *__s, int __c, size_t __n)
{
register unsigned long int __d0;
register void *__res;
if (__n == 0)
return NULL;
__asm__ __volatile__
("cld\n\t"
"repne; scasb\n\t"
"je 1f\n\t"
"movl $1,%0\n"
"1:"
: "=D" (__res), "=&c" (__d0)
: "a" (__c), "0" (__s), "1" (__n)
: "cc");
return __res - 1;
}
#endif
#define _HAVE_STRING_ARCH_memrchr 1
#ifndef _FORCE_INLINES
__STRING_INLINE void *
__memrchr (__const void *__s, int __c, size_t __n)
{
register unsigned long int __d0;
register void *__res;
if (__n == 0)
return NULL;
__asm__ __volatile__
("std\n\t"
"repne; scasb\n\t"
"je 1f\n\t"
"orl $-1,%0\n"
"1:\tcld"
: "=D" (__res), "=&c" (__d0)
: "a" (__c), "0" (__s + __n - 1), "1" (__n)
: "cc");
return __res + 1;
}
# ifdef __USE_GNU
# define memrchr(s, c, n) __memrchr (s, c, n)
# endif
#endif
/* Return the length of S. */
#define _HAVE_STRING_ARCH_strlen 1
#ifndef _FORCE_INLINES
__STRING_INLINE size_t
strlen (__const char *__str)
{
register unsigned long int __d0;
register size_t __res;
__asm__ __volatile__
("cld\n\t"
"repne; scasb\n\t"
"notl %0"
: "=c" (__res), "=&D" (__d0)
: "1" (__str), "a" (0), "0" (0xffffffff)
: "cc");
return __res - 1;
}
#endif
/* Copy SRC to DEST. */
#define _HAVE_STRING_ARCH_strcpy 1
#ifndef _FORCE_INLINES
__STRING_INLINE char *
strcpy (char *__dest, __const char *__src)
{
register unsigned long int __d0, __d1;
__asm__ __volatile__
("cld\n"
"1:\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b"
: "=&S" (__d0), "=&D" (__d1)
: "0" (__src), "1" (__dest)
: "ax", "memory", "cc");
return __dest;
}
#endif
/* Copy no more than N characters of SRC to DEST. */
#define _HAVE_STRING_ARCH_strncpy 1
#ifndef _FORCE_INLINES
__STRING_INLINE char *
strncpy (char *__dest, __const char *__src, size_t __n)
{
register unsigned long int __d0, __d1, __d2;
__asm__ __volatile__
("cld\n"
"1:\n\t"
"decl %2\n\t"
"js 2f\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"rep; stosb\n"
"2:"
: "=&S" (__d0), "=&D" (__d1), "=&c" (__d2)
: "0" (__src), "1" (__dest), "2" (__n)
: "ax", "memory", "cc");
return __dest;
}
#endif
/* Append SRC onto DEST. */
#define _HAVE_STRING_ARCH_strcat 1
#ifndef _FORCE_INLINES
__STRING_INLINE char *
strcat (char *__dest, __const char *__src)
{
register unsigned long int __d0, __d1, __d2, __d3;
__asm__ __volatile__
("cld\n\t"
"repne; scasb\n\t"
"decl %1\n"
"1:\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b"
: "=&S" (__d0), "=&D" (__d1), "=&c" (__d2), "=&a" (__d3)
: "0" (__src), "1" (__dest), "2" (0xffffffff), "3" (0)
: "memory", "cc");
return __dest;
}
#endif
/* Append no more than N characters from SRC onto DEST. */
#define _HAVE_STRING_ARCH_strncat 1
#ifndef _FORCE_INLINES
__STRING_INLINE char *
strncat (char *__dest, __const char *__src, size_t __n)
{
register unsigned long int __d0, __d1, __d2, __d3;
__asm__ __volatile__
("cld\n\t"
"repne; scasb\n\t"
"decl %1\n\t"
"movl %4,%2\n"
"1:\n\t"
"decl %2\n\t"
"js 2f\n\t"
"lodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"jmp 3f\n"
"2:\n\t"
"xorl %3,%3\n\t"
"stosb\n"
"3:"
: "=&S" (__d0), "=&D" (__d1), "=&c" (__d2), "=&a" (__d3)
: "g" (__n), "0" (__src), "1" (__dest), "2" (0xffffffff), "3" (0)
: "memory", "cc");
return __dest;
}
#endif
/* Compare S1 and S2. */
#define _HAVE_STRING_ARCH_strcmp 1
#ifndef _FORCE_INLINES
__STRING_INLINE int
strcmp (__const char *__s1, __const char *__s2)
{
register unsigned long int __d0, __d1;
register int __res;
__asm__ __volatile__
("cld\n"
"1:\n\t"
"lodsb\n\t"
"scasb\n\t"
"jne 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"xorl %%eax,%%eax\n\t"
"jmp 3f\n"
"2:\n\t"
"sbbl %%eax,%%eax\n\t"
"orb $1,%%al\n"
"3:"
: "=a" (__res), "=&S" (__d0), "=&D" (__d1)
: "1" (__s1), "2" (__s2)
: "cc");
return __res;
}
#endif
/* Compare N characters of S1 and S2. */
#define _HAVE_STRING_ARCH_strncmp 1
#ifndef _FORCE_INLINES
__STRING_INLINE int
strncmp (__const char *__s1, __const char *__s2, size_t __n)
{
register unsigned long int __d0, __d1, __d2;
register int __res;
__asm__ __volatile__
("cld\n"
"1:\n\t"
"decl %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:\n\t"
"xorl %%eax,%%eax\n\t"
"jmp 4f\n"
"3:\n\t"
"sbbl %%eax,%%eax\n\t"
"orb $1,%%al\n"
"4:"
: "=a" (__res), "=&S" (__d0), "=&D" (__d1), "=&c" (__d2)
: "1" (__s1), "2" (__s2), "3" (__n)
: "cc");
return __res;
}
#endif
/* Find the first occurrence of C in S. */
#define _HAVE_STRING_ARCH_strchr 1
#define _USE_STRING_ARCH_strchr 1
#define strchr(s, c) \
(__extension__ (__builtin_constant_p (c) \
? __strchr_c (s, ((c) & 0xff) << 8) \
: __strchr_g (s, c)))
__STRING_INLINE char *__strchr_g (__const char *__s, int __c);
__STRING_INLINE char *
__strchr_g (__const char *__s, int __c)
{
register unsigned long int __d0;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"movb %%al,%%ah\n"
"1:\n\t"
"lodsb\n\t"
"cmpb %%ah,%%al\n\t"
"je 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"movl $1,%1\n"
"2:\n\t"
"movl %1,%0"
: "=a" (__res), "=&S" (__d0)
: "0" (__c), "1" (__s)
: "cc");
return __res - 1;
}
__STRING_INLINE char *__strchr_c (__const char *__s, int __c);
__STRING_INLINE char *
__strchr_c (__const char *__s, int __c)
{
register unsigned long int __d0;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"1:\n\t"
"lodsb\n\t"
"cmpb %%ah,%%al\n\t"
"je 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"movl $1,%1\n"
"2:\n\t"
"movl %1,%0"
: "=a" (__res), "=&S" (__d0)
: "0" (__c), "1" (__s)
: "cc");
return __res - 1;
}
/* Find the first occurrence of C in S or the final NUL byte. */
#define _HAVE_STRING_ARCH_strchrnul 1
#define __strchrnul(s, c) \
(__extension__ (__builtin_constant_p (c) \
? ((c) == '\0' \
? (char *) __rawmemchr (s, c) \
: __strchrnul_c (s, ((c) & 0xff) << 8)) \
: __strchrnul_g (s, c)))
__STRING_INLINE char *__strchrnul_g (__const char *__s, int __c);
__STRING_INLINE char *
__strchrnul_g (__const char *__s, int __c)
{
register unsigned long int __d0;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"movb %%al,%%ah\n"
"1:\n\t"
"lodsb\n\t"
"cmpb %%ah,%%al\n\t"
"je 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"2:\n\t"
"movl %1,%0"
: "=a" (__res), "=&S" (__d0)
: "0" (__c), "1" (__s)
: "cc");
return __res - 1;
}
__STRING_INLINE char *__strchrnul_c (__const char *__s, int __c);
__STRING_INLINE char *
__strchrnul_c (__const char *__s, int __c)
{
register unsigned long int __d0;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"1:\n\t"
"lodsb\n\t"
"cmpb %%ah,%%al\n\t"
"je 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"2:\n\t"
"movl %1,%0"
: "=a" (__res), "=&S" (__d0)
: "0" (__c), "1" (__s)
: "cc");
return __res - 1;
}
#ifdef __USE_GNU
# define strchrnul(s, c) __strchrnul (s, c)
#endif
/* Return the length of the initial segment of S which
consists entirely of characters not in REJECT. */
#define _HAVE_STRING_ARCH_strcspn 1
#ifndef _FORCE_INLINES
# ifdef __PIC__
__STRING_INLINE size_t
strcspn (__const char *__s, __const char *__reject)
{
register unsigned long int __d0, __d1, __d2;
register char *__res;
__asm__ __volatile__
("pushl %%ebx\n\t"
"cld\n\t"
"movl %4,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%ebx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %4,%%edi\n\t"
"movl %%ebx,%%ecx\n\t"
"repne; scasb\n\t"
"jne 1b\n"
"2:\n\t"
"popl %%ebx"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&D" (__d2)
: "d" (__reject), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return (__res - 1) - __s;
}
# else
__STRING_INLINE size_t
strcspn (__const char *__s, __const char *__reject)
{
register unsigned long int __d0, __d1, __d2, __d3;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"movl %5,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%edx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %5,%%edi\n\t"
"movl %%edx,%%ecx\n\t"
"repne; scasb\n\t"
"jne 1b\n"
"2:"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&d" (__d2), "=&D" (__d3)
: "g" (__reject), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return (__res - 1) - __s;
}
# endif
#endif
/* Return the length of the initial segment of S which
consists entirely of characters in ACCEPT. */
#define _HAVE_STRING_ARCH_strspn 1
#ifndef _FORCE_INLINES
# ifdef __PIC__
__STRING_INLINE size_t
strspn (__const char *__s, __const char *__accept)
{
register unsigned long int __d0, __d1, __d2;
register char *__res;
__asm__ __volatile__
("pushl %%ebx\n\t"
"cld\n\t"
"movl %4,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%ebx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %4,%%edi\n\t"
"movl %%ebx,%%ecx\n\t"
"repne; scasb\n\t"
"je 1b\n"
"2:\n\t"
"popl %%ebx"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&D" (__d2)
: "r" (__accept), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return (__res - 1) - __s;
}
# else
__STRING_INLINE size_t
strspn (__const char *__s, __const char *__accept)
{
register unsigned long int __d0, __d1, __d2, __d3;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"movl %5,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%edx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %5,%%edi\n\t"
"movl %%edx,%%ecx\n\t"
"repne; scasb\n\t"
"je 1b\n"
"2:"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&d" (__d2), "=&D" (__d3)
: "g" (__accept), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return (__res - 1) - __s;
}
# endif
#endif
/* Find the first occurrence in S of any character in ACCEPT. */
#define _HAVE_STRING_ARCH_strpbrk 1
#ifndef _FORCE_INLINES
# ifdef __PIC__
__STRING_INLINE char *
strpbrk (__const char *__s, __const char *__accept)
{
unsigned long int __d0, __d1, __d2;
register char *__res;
__asm__ __volatile__
("pushl %%ebx\n\t"
"cld\n\t"
"movl %4,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%ebx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %4,%%edi\n\t"
"movl %%ebx,%%ecx\n\t"
"repne; scasb\n\t"
"jne 1b\n\t"
"decl %0\n\t"
"jmp 3f\n"
"2:\n\t"
"xorl %0,%0\n"
"3:\n\t"
"popl %%ebx"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&D" (__d2)
: "r" (__accept), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return __res;
}
# else
__STRING_INLINE char *
strpbrk (__const char *__s, __const char *__accept)
{
register unsigned long int __d0, __d1, __d2, __d3;
register char *__res;
__asm__ __volatile__
("cld\n\t"
"movl %5,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t"
"movl %%ecx,%%edx\n"
"1:\n\t"
"lodsb\n\t"
"testb %%al,%%al\n\t"
"je 2f\n\t"
"movl %5,%%edi\n\t"
"movl %%edx,%%ecx\n\t"
"repne; scasb\n\t"
"jne 1b\n\t"
"decl %0\n\t"
"jmp 3f\n"
"2:\n\t"
"xorl %0,%0\n"
"3:"
: "=&S" (__res), "=&a" (__d0), "=&c" (__d1), "=&d" (__d2), "=&D" (__d3)
: "g" (__accept), "0" (__s), "1" (0), "2" (0xffffffff)
: "cc");
return __res;
}
# endif
#endif
/* Find the first occurrence of NEEDLE in HAYSTACK. */
#define _HAVE_STRING_ARCH_strstr 1
#ifndef _FORCE_INLINES
# ifdef __PIC__
__STRING_INLINE char *
strstr (__const char *__haystack, __const char *__needle)
{
register unsigned long int __d0, __d1, __d2;
register char *__res;
__asm__ __volatile__
("pushl %%ebx\n\t"
"cld\n\t" \
"movl %4,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */
"movl %%ecx,%%ebx\n"
"1:\n\t"
"movl %4,%%edi\n\t"
"movl %%esi,%%eax\n\t"
"movl %%ebx,%%ecx\n\t"
"repe; cmpsb\n\t"
"je 2f\n\t" /* also works for empty string, see above */
"xchgl %%eax,%%esi\n\t"
"incl %%esi\n\t"
"cmpb $0,-1(%%eax)\n\t"
"jne 1b\n\t"
"xorl %%eax,%%eax\n\t"
"2:\n\t"
"popl %%ebx"
: "=&a" (__res), "=&c" (__d0), "=&S" (__d1), "=&D" (__d2)
: "r" (__needle), "0" (0), "1" (0xffffffff), "2" (__haystack)
: "cc");
return __res;
}
# else
__STRING_INLINE char *
strstr (__const char *__haystack, __const char *__needle)
{
register unsigned long int __d0, __d1, __d2, __d3;
register char *__res;
__asm__ __volatile__
("cld\n\t" \
"movl %5,%%edi\n\t"
"repne; scasb\n\t"
"notl %%ecx\n\t"
"decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */
"movl %%ecx,%%edx\n"
"1:\n\t"
"movl %5,%%edi\n\t"
"movl %%esi,%%eax\n\t"
"movl %%edx,%%ecx\n\t"
"repe; cmpsb\n\t"
"je 2f\n\t" /* also works for empty string, see above */
"xchgl %%eax,%%esi\n\t"
"incl %%esi\n\t"
"cmpb $0,-1(%%eax)\n\t"
"jne 1b\n\t"
"xorl %%eax,%%eax\n\t"
"2:"
: "=&a" (__res), "=&c" (__d0), "=&S" (__d1), "=&d" (__d2), "=&D" (__d3)
: "g" (__needle), "0" (0), "1" (0xffffffff), "2" (__haystack)
: "cc");
return __res;
}
# endif
#endif
#ifndef _FORCE_INLINES
# undef __STRING_INLINE
#endif
#endif /* use string inlines && GNU CC */
Reference in New Issue View Git Blame Copy Permalink