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[/] [or1k/] [trunk/] [newlib-1.10.0/] [newlib/] [libc/] [machine/] [i386/] [memmove.S] - Blame information for rev 1773

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1 1008 ivang 
/*
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 * ====================================================
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 * Copyright (C) 1998 by Cygnus Solutions. 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 (memmove)
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       SOTYPE_FUNCTION(memmove)
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SYM (memmove):
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        pushl ebp
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        movl esp,ebp
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        pushl esi
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        pushl edi
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        pushl ebx
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        movl 8(ebp),edi
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        movl 16(ebp),ecx
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        movl 12(ebp),esi
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/*  check for destructive overlap (src < dst && dst < src + length) */
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        cld
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        cmpl edi,esi
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        jae  .L2
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        leal -1(ecx,esi),ebx
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        cmpl ebx,edi
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        ja   .L2
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/* IF:   destructive overlap, must copy backwards */
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        addl ecx,esi
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        addl ecx,edi
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        std
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#ifndef __OPTIMIZE_SIZE__
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        cmpl $8,ecx
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        jbe .L13
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.L18:
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/* move trailing bytes in reverse until destination address is long word aligned */
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        movl edi,edx
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        movl ecx,ebx
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        andl $3,edx
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        jz .L21
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        movl edx,ecx
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        decl esi
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        decl edi
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        subl ecx,ebx
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        rep
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        movsb
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        mov ebx,ecx
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        incl esi
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        incl edi
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.L21:
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/* move bytes in reverse, a long word at a time */
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        shrl $2,ecx
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        subl $4,esi
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        subl $4,edi
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        rep
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        movsl
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        addl $4,esi
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        addl $4,edi
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        movl ebx,ecx
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        andl $3,ecx
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#endif /* !__OPTIMIZE_SIZE__ */
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/* handle any remaining bytes not on a long word boundary */
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.L13:
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        decl esi
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        decl edi
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.L15:
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        rep
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        movsb
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        jmp .L5
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        .p2align 4,,7
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/* ELSE:   no destructive overlap so we copy forwards */
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.L2:
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#ifndef __OPTIMIZE_SIZE__
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        cmpl $8,ecx
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        jbe .L3
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/* move any preceding bytes until destination address is long word aligned */
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        movl edi,edx
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        movl ecx,ebx
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        andl $3,edx
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        jz .L11
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        movl $4,ecx
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        subl edx,ecx
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        andl $3,ecx
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        subl ecx,ebx
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        rep
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        movsb
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        mov ebx,ecx
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/* move bytes a long word at a time */
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.L11:
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        shrl $2,ecx
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        .p2align 2
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        rep
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        movsl
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        movl ebx,ecx
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        andl $3,ecx
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#endif /* !__OPTIMIZE_SIZE__ */
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/* handle any remaining bytes */
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.L3:
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        rep
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        movsb
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.L5:
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        movl 8(ebp),eax
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        cld
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        leal -12(ebp),esp
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        popl ebx
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        popl edi
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        popl esi
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        leave
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        ret

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