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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [i386/] [memchr.S] - Blame information for rev 407

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Line No. Rev Author Line
1 148 jeremybenn 
/*
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 * ====================================================
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 * Copyright (C) 1998, 2002, 2008 by Red Hat Inc. All rights reserved.
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 *
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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        #include "i386mach.h"
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        .global SYM (memchr)
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       SOTYPE_FUNCTION(memchr)
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SYM (memchr):
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        pushl   ebp
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        movl    esp,ebp
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        pushl   edi
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        movzbl  12(ebp),eax
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        movl    16(ebp),ecx
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        movl    8(ebp),edi
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        xorl    edx,edx
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        testl   ecx,ecx
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        jz      L20
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#ifdef __OPTIMIZE_SIZE__
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        cld
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        repnz
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        scasb
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        setnz   dl
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        decl    edi
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#else /* !__OPTIMIZE_SIZE__ */
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/* Do byte-wise checks until string is aligned.  */
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        testl   $3,edi
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        je      L5
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        cmpb    (edi),al
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        je      L15
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        incl    edi
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        decl    ecx
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        je      L20
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        testl   $3,edi
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        je      L5
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        cmpb    (edi),al
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        je      L15
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        incl    edi
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        decl    ecx
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        je      L20
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        testl   $3,edi
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        je      L5
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        cmpb    (edi),al
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        je      L15
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        incl    edi
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        decl    ecx
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        je      L20
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/* Create a mask, then check a word at a time.  */
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L5:
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        movb    al,ah
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        movl    eax,edx
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        sall    $16,edx
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        orl     edx,eax
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        pushl   ebx
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        .p2align 4,,7
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L8:
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        subl    $4,ecx
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        jc      L9
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        movl    (edi),edx
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        addl    $4,edi
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        xorl    eax,edx
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        leal    -16843009(edx),ebx
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        notl    edx
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        andl    edx,ebx
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        testl   $-2139062144,ebx
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        je      L8
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        subl    $4,edi
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L9:
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        popl    ebx
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        xorl    edx,edx
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        addl    $4,ecx
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        je      L20
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/* Final byte-wise checks.  */
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        .p2align 4,,7
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L10:
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        cmpb    (edi),al
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        je      L15
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        incl    edi
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        decl    ecx
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        jne     L10
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        xorl    edi,edi
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#endif /* !__OPTIMIZE_SIZE__ */
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L15:
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        decl    edx
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        andl    edi,edx
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L20:
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        movl    edx,eax
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        leal    -4(ebp),esp
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        popl    edi
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        leave
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        ret

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