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[/] [scarts/] [trunk/] [toolchain/] [scarts-newlib/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [i386/] [memset.S] - Blame information for rev 9

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Line No. Rev Author Line
1 9 jlechner 
/*
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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 (memset)
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       SOTYPE_FUNCTION(memset)
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SYM (memset):
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        pushl ebp
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        movl esp,ebp
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        pushl edi
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        movl 8(ebp),edi
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        movzbl 12(ebp),eax
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        movl 16(ebp),ecx
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        cld
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#ifndef __OPTIMIZE_SIZE__
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/* Less than 16 bytes won't benefit from the 'rep stosl' loop.  */
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        cmpl $16,ecx
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        jbe .L19
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        testl $7,edi
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        je .L10
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/* It turns out that 8-byte aligned 'rep stosl' outperforms
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   4-byte aligned on some x86 platforms.  */
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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        testl $7,edi
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        je .L10
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        movb al,(edi)
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        incl edi
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        decl ecx
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/* At this point, ecx>8 and edi%8==0.  */
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.L10:
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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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        movl ecx,edx
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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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        movl edx,ecx
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#endif /* not __OPTIMIZE_SIZE__ */
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.L19:
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        rep
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        stosb
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        movl 8(ebp),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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