diff options
Diffstat (limited to 'newlib/libc/machine/i386/memchr.S')
| -rw-r--r-- | newlib/libc/machine/i386/memchr.S | 88 |
1 files changed, 8 insertions, 80 deletions
diff --git a/newlib/libc/machine/i386/memchr.S b/newlib/libc/machine/i386/memchr.S index 7639685be..d29a04521 100644 --- a/newlib/libc/machine/i386/memchr.S +++ b/newlib/libc/machine/i386/memchr.S @@ -1,6 +1,6 @@ /* * ==================================================== - * Copyright (C) 1998, 2002, 2008 by Red Hat Inc. All rights reserved. + * Copyright (C) 1998, 2002 by Red Hat Inc. All rights reserved. * * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice @@ -9,23 +9,21 @@ */ #include "i386mach.h" - + .global SYM (memchr) SOTYPE_FUNCTION(memchr) SYM (memchr): pushl ebp movl esp,ebp - pushl edi - movzbl 12(ebp),eax - movl 16(ebp),ecx - movl 8(ebp),edi + pushl edi + movl 12(ebp),eax + movl 16(ebp),ecx + movl 8(ebp),edi xorl edx,edx testl ecx,ecx - jz L20 - -#ifdef __OPTIMIZE_SIZE__ + jz L1 cld repnz @@ -33,79 +31,9 @@ SYM (memchr): setnz dl decl edi - -#else /* !__OPTIMIZE_SIZE__ */ -/* Do byte-wise checks until string is aligned. */ - testl $3,edi - je L5 - cmpb (edi),al - je L15 - incl edi - decl ecx - je L20 - - testl $3,edi - je L5 - cmpb (edi),al - je L15 - incl edi - decl ecx - je L20 - - testl $3,edi - je L5 - cmpb (edi),al - je L15 - incl edi - decl ecx - je L20 - -/* Create a mask, then check a word at a time. */ -L5: - movb al,ah - movl eax,edx - sall $16,edx - orl edx,eax - pushl ebx - - .p2align 4,,7 -L8: - subl $4,ecx - jc L9 - movl (edi),edx - addl $4,edi - xorl eax,edx - leal -16843009(edx),ebx - notl edx - andl edx,ebx - testl $-2139062144,ebx - je L8 - - subl $4,edi - -L9: - popl ebx - xorl edx,edx - addl $4,ecx - je L20 - -/* Final byte-wise checks. */ - .p2align 4,,7 -L10: - cmpb (edi),al - je L15 - incl edi - decl ecx - jne L10 - - xorl edi,edi - -#endif /* !__OPTIMIZE_SIZE__ */ - -L15: decl edx andl edi,edx -L20: +L1: movl edx,eax leal -4(ebp),esp |