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- /*
- Copyright (C) 1994 Free Software Foundation, Inc.
- Contributed by Ulrich Drepper <drepper@ira.uka.de>.
-
- 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., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <string.h>
- #include "asm-ops.h"
-
- char *
- strstr(const char *haystack, const char *needle)
- {
- register char *__res;
- __asm__(
- #if defined(__PIC__) || defined(__pic__)
- "pushl %%ebx\n\t"
- #endif
- "movl %1,%0\n\t"
- "testb $0xff,(%2)\n\t"
- "je " LF(1) "\n\t"
- "movw (%2),%%cx\n\t"
- "addl $2,%2\n\t"
- "cld\n\t"
-
- "orb %%ch,%%ch\n\t"
- "jne " LF(5) "\n"
- /* handle special case of a one-character-needle */
- LL(6) "\tmovb (%1),%%al\n\t"
- "orb %%al,%%al\n\t"
- "je " LF(2) "\n\t"
- "incl %1\n\t"
- "xorb %%cl,%%al\n\t"
- "jne " LB(6) "\n\t"
- "leal -1(%1),%0\n\t"
- "jmp " LF(1) "\n"
-
- LL(5) "\ttestb $0xff,(%1)\n\t"
- "je " LF(2) "\n\t"
-
- "cmpb %%cl,%%ch\n\t"
- "jne " LF(8) "\n"
-
- LL(4) "\tmovw (%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(30) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 1(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(31) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 2(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(32) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 3(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(33) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "addl $4,%1\n\t"
- "jmp " LB(4) "\n"
-
- LL(33) "\tincl %1\n"
- LL(32) "\tincl %1\n"
- LL(31) "\tincl %1\n"
- LL(30) "\tmovl %1,%0\n\t"
- "addl $2,%1\n\t"
- "movl %2,%%ebx\n"
- LL(7) "\tmovb (%%ebx),%%ah\n\t"
- "incl %%ebx\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(1) "\n\t"
- "movb (%1),%%al\n\t"
- "incl %1\n\t"
- "xorb %%al,%%ah\n\t"
- "je " LB(7) "\n\t"
- "orb %%al,%%al\n\t"
- "je " LF(2) "\n\t"
- "leal 1(%0),%1\n\t"
- "jmp " LB(4) "\n"
-
- LL(8) "\tmovw (%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(90) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 1(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(91) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 2(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(92) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "movw 3(%1),%%ax\n\t"
- "cmpw %%ax,%%cx\n\t"
- "je " LF(93) "\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(2) "\n\t"
- "addl $4,%1\n\t"
- "jmp " LB(8) "\n"
-
- LL(93) "\tincl %1\n"
- LL(92) "\tincl %1\n"
- LL(91) "\tincl %1\n"
- LL(90) "\tmovl %1,%0\n\t"
- "addl $2,%1\n\t"
- "movl %2,%%ebx\n"
- LL(10) "\tmovb (%%ebx),%%ah\n\t"
- "incl %%ebx\n\t"
- "orb %%ah,%%ah\n\t"
- "je " LF(1) "\n\t"
- "movb (%1),%%al\n\t"
- "incl %1\n\t"
- "xorb %%al,%%ah\n\t"
- "je " LB(10) "\n\t"
- "orb %%al,%%al\n\t"
- "je " LF(2) "\n\t"
- "leal 2(%0),%1\n\t"
- "jmp " LB(8) "\n"
-
- LL(2) "\txorl %0,%0\n"
- #if defined(__PIC__) || defined(__pic__)
- LL(1) "\tpopl %%ebx\n"
- :"=D" (__res):"S" (haystack),"d" (needle):"si","di","cx","dx");
- #else
- LL(1)
- :"=D" (__res):"S" (haystack),"d" (needle):"si","di","bx","cx","dx");
- #endif
- return __res;
- }
-