From: Gabriel Paubert <paubert@iram.es>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: gcc-help@gcc.gnu.org, kernel mailz <kernelmailz@googlemail.com>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: Re: Inline assembly queries [2]
Date: Tue, 7 Jul 2009 15:46:22 +0200 [thread overview]
Message-ID: <20090707134622.GB13444@iram.es> (raw)
In-Reply-To: <m37hykis4d.fsf@hase.home>
On Tue, Jul 07, 2009 at 02:40:02PM +0200, Andreas Schwab wrote:
> Gabriel Paubert <paubert@iram.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
prev parent reply other threads:[~2009-07-07 13:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-03 6:44 Inline assembly queries [2] kernel mailz
2009-07-03 17:40 ` Brad Boyer
2009-07-03 20:05 ` kernel mailz
2009-07-03 21:19 ` Andreas Schwab
2009-07-03 20:57 ` Andreas Schwab
2009-07-06 6:56 ` Gabriel Paubert
2009-07-07 12:40 ` Andreas Schwab
2009-07-07 13:46 ` Gabriel Paubert [this message]
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