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

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Date:	Tue, 07 Jul 2009 14:40:02 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Gabriel Paubert <paubert@...m.es>
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]

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.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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