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From:	"Joel Saunders" <jbs30000 AT aol DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Uhm, nobody knows the answer or...
Date:	Fri, 8 Feb 2002 16:52:11 +0000 (UTC)
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Ok, I have the variables:
char *Screen_PTR = (char *)(0xB8000 + __djgpp_conventional_base);
char My_Name[9] = {"J O E L "};
I have the macro
#define Mov_Byte(Src, Dest, Mov_Size)\
        __asm__ __volatile__(\
                "cld\n\t"\
                "rep\n\t"\
                "movsb"\
                : :"S" (Src), "D" (Dest), "c" (Mov_Size))
This works:
Mov_Byte(&My_Name[0], &Screen_PTR[0], 8);
However, if I rewrite the macro like this:
#define Mov_Byte(Src, Dest, Mov_Size)\
        __asm__ __volatile__(\
                "cld\n\t"\
                "rep\n\t"\
                "movsb"\
                : :"S" (Src), "D" (Dest), "c" (Mov_Size)\
                :"%ecx", "%esi", "%edi"
And try the same thing, then when making the program, I get this error:
Error: Can't find a register in class `CREG' while reloading `asm'.




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