linux-kernel - Re: Inline assembly queries [2]

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Date:	Tue, 7 Jul 2009 15:46:22 +0200
From:	Gabriel Paubert <paubert@...m.es>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	Brad Boyer <flar@...andria.com>, gcc-help@....gnu.org,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	kernel mailz <kernelmailz@...glemail.com>
Subject: Re: Inline assembly queries [2]

On Tue, Jul 07, 2009 at 02:40:02PM +0200, Andreas Schwab wrote:
> Gabriel Paubert <paubert@...m.es> writes:
> 
> > On Fri, Jul 03, 2009 at 10:57:12PM +0200, Andreas Schwab wrote:
> >> The 'Z' constraint is required for a memory operand for insns that don't
> >> have an update form (which would be selected by the %U modifier).  
> >
> > Hmmm, I believed that it was for instructions that only have an indexed
> > form (all Altivec, byte reverse, and l?arx/st?cx for atomic operations).
> >
> > Of course none of these instructions have an update form, but they don't
> > have an offset encoded in the instruction either.
> 
> Yes, you are right.  IIRC there are either all u/x/ux forms or only the
> x form.

AFAIR IBM (probably) managed to screw up by making an exception for lwa: 
lwa, lwax and lwaux exist, but not lwau!

	Gabriel
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