From gcc-patches-return-65619-listarch-gcc-patches=gcc dot gnu dot org at gcc dot gnu dot org Mon Aug 05 23:38:15 2002
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Date: Tue, 6 Aug 2002 09:08:10 +0930
From: Alan Modra <amodra at bigpond dot net dot au>
To: Roman Zippel <zippel at linux-m68k dot org>
Cc: gcc at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Subject: Re: commutative asm operands
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In-Reply-To: <Pine dot LNX dot 4 dot 44 dot 0208052242430 dot 28515-100000 at serv>; from zippel at linux-m68k dot org on Tue, Aug 06, 2002 at 01:13:56AM +0200

On Tue, Aug 06, 2002 at 01:13:56AM +0200, Roman Zippel wrote:
> On Mon, 5 Aug 2002, Alan Modra wrote:
> >         addc 3, 5, 3
> 
> The "3, 5, 3" line isn't correct, it's conflicting with the constraints.

Oh?  This is from (doing some renumbering of constraints)

  asm ("addc %0, %1, %2" : "=r" (a) : "%0" (c), "r" (a));

Or expanding the "%" constraint:

  asm ("addc %0, %1, %2" : "=r,r" (a) : "0,r" (c), "r,0" (a));

Tell me why this conflicts.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre