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Viewing changes to android/bionic/libc/arch-x86/string/bzero.S

  • Committer: Package Import Robot
  • Author(s): Dmitrijs Ledkovs
  • Date: 2013-07-05 10:12:24 UTC
  • Revision ID: package-import@ubuntu.com-20130705101224-6qo3e8jbz8p31aa1
Tags: upstream-0.20130705.1
Import upstream version 0.20130705.1

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android/bionic/libc/arch-x86/string/bzero.S
 
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/*      $OpenBSD: bzero.S,v 1.3 2005/08/07 11:30:38 espie Exp $ */
 
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/*
 
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 * Written by J.T. Conklin <jtc@netbsd.org>.
 
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 * Public domain.
 
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 */
 
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#include <machine/asm.h>
 
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ENTRY(bzero)
 
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        pushl   %edi
 
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        movl    8(%esp),%edi
 
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        movl    12(%esp),%edx
 
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        cld                             /* set fill direction forward */
 
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        xorl    %eax,%eax               /* set fill data to 0 */
 
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        /*
 
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         * if the string is too short, it's really not worth the overhead
 
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         * of aligning to word boundries, etc.  So we jump to a plain
 
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         * unaligned set.
 
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         */
 
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        cmpl    $16,%edx
 
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        jb      L1
 
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        movl    %edi,%ecx               /* compute misalignment */
 
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        negl    %ecx
 
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        andl    $3,%ecx
 
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        subl    %ecx,%edx
 
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        rep                             /* zero until word aligned */
 
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        stosb
 
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        movl    %edx,%ecx               /* zero by words */
 
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        shrl    $2,%ecx
 
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        andl    $3,%edx
 
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        rep
 
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        stosl
 
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L1:     movl    %edx,%ecx               /* zero remainder by bytes */
 
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        rep
 
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        stosb
 
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        popl    %edi
 
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        ret