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Date: Fri, 8 Feb 2002 12:42:21 -0500
Message-Id: <200202081742.g18HgL008217@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to: <5563ab859c72dffdd2ded7c0f0edf714.62691@mygate.mailgate.org>
	(jbs30000 AT aol DOT com)
Subject: Re: Uhm, nobody knows the answer or...
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> #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'.

You can't clobber a register you're also using for in/out.  What you
need to do here is have an output entity as well, which is "c"
(Move_Size), and have the input that used to be "c" be "0" (edit as
needed).  That tells gcc that ecx is used as input *and* changed as
output.