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From: "Joel Saunders" <jbs30000 AT aol DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Strange
Date: Wed, 6 Feb 2002 14:42:20 +0000 (UTC)
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These routines work, so long as I don't include a clobber list.  Why?
#define Mov_Byte(Src, Dest, Mov_Size)\
        __asm__ __volatile__(\
                "cld\n\t"\
                "rep\n\t"\
                "movsb"\
                : :"S" (Src), "D" (Dest), "c" (Mov_Size))\

void Move_Bytes(void *Src, void *Dest, long Move_Size)
{
        asm (
            "cld\n\t"
            "rep\n\t"
            "movsb"
            : :"S" (Src), "D" (Dest), "c" (Move_Size));
}


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