diff options
Diffstat (limited to 'newlib/libc/machine/i386/strchr.S')
| -rw-r--r-- | newlib/libc/machine/i386/strchr.S | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/newlib/libc/machine/i386/strchr.S b/newlib/libc/machine/i386/strchr.S deleted file mode 100644 index 1d98b8149..000000000 --- a/newlib/libc/machine/i386/strchr.S +++ /dev/null @@ -1,172 +0,0 @@ -/* - * ==================================================== - * Copyright (C) 1998, 2002, 2008 by Red Hat Inc. All rights reserved. - * - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - - #include "i386mach.h" - - .global SYM (strchr) - SOTYPE_FUNCTION(strchr) - -SYM (strchr): - - pushl ebp - movl esp,ebp - pushl edi - pushl ebx - xorl ebx,ebx - movl 8(ebp),edi - addb 12(ebp),bl - -#ifndef __OPTIMIZE_SIZE__ -/* Special case strchr(p,0). */ - je L25 - -/* Do byte-wise checks until string is aligned. */ - test $3,edi - je L5 - movl edi,eax - movb (eax),cl - testb cl,cl - je L14 - cmpb bl,cl - je L19 - incl edi - - test $3,edi - je L5 - movl edi,eax - movb (eax),cl - testb cl,cl - je L14 - cmpb bl,cl - je L19 - incl edi - - test $3,edi - je L5 - movl edi,eax - movb (eax),cl - testb cl,cl - je L14 - cmpb bl,cl - je L19 - incl edi - -/* create 4 byte mask which is just the desired byte repeated 4 times */ -L5: - movl ebx,ecx - sall $8,ebx - subl $4,edi - orl ecx,ebx - movl ebx,edx - sall $16,ebx - orl edx,ebx - -/* loop performing 4 byte mask checking for 0 byte or desired byte */ - .p2align 4,,7 -L10: - addl $4,edi - movl (edi),ecx - leal -16843009(ecx),edx - movl ecx,eax - notl eax - andl eax,edx - testl $-2139062144,edx - jne L9 - - xorl ebx,ecx - leal -16843009(ecx),edx - notl ecx - andl ecx,edx - testl $-2139062144,edx - je L10 -#endif /* not __OPTIMIZE_SIZE__ */ - -/* loop while (*s && *s++ != c) */ -L9: - leal -1(edi),eax - .p2align 4,,7 -L15: - incl eax - movb (eax),dl - testb dl,dl - je L14 - cmpb bl,dl - jne L15 - -L14: -/* if (*s == c) return address otherwise return NULL */ - cmpb bl,(eax) - je L19 - xorl eax,eax - -L19: - leal -8(ebp),esp - popl ebx - popl edi - leave - ret - -#ifndef __OPTIMIZE_SIZE__ -/* Special case strchr(p,0). */ -#if 0 - /* Hideous performance on modern machines. */ -L25: - cld - movl $-1,ecx - xor eax,eax - repnz - scasb - leal -1(edi),eax - jmp L19 -#endif -L25: -/* Do byte-wise checks until string is aligned. */ - test $3,edi - je L26 - movl edi,eax - movb (eax),cl - testb cl,cl - je L19 - incl edi - - test $3,edi - je L26 - movl edi,eax - movb (eax),cl - testb cl,cl - je L19 - incl edi - - test $3,edi - je L26 - movl edi,eax - movb (eax),cl - testb cl,cl - je L19 - incl edi - -L26: - subl $4,edi - -/* loop performing 4 byte mask checking for desired 0 byte */ - .p2align 4,,7 -L27: - addl $4,edi - movl (edi),ecx - leal -16843009(ecx),edx - movl ecx,eax - notl eax - andl eax,edx - testl $-2139062144,edx - je L27 - - jmp L9 - -#endif /* !__OPTIMIZE_SIZE__ */ |