linux-kernel - Re: [PATCH] [POWERPC] Improve (in|out)

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Message-ID: <jeabik385g.fsf@sykes.suse.de>
Date:	Wed, 21 May 2008 00:47:23 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Trent Piepho <tpiepho@...escale.com>
Cc:	linuxppc-dev@...abs.org, Scott Wood <scottwood@...escale.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [POWERPC] Improve (in|out)_beXX() asm code

Trent Piepho <tpiepho@...escale.com> writes:

> It's the _le versions that have a problem, since we can't get gcc to just use
> the register indexed mode.  It seems like an obvious thing to have a
> constraint for, but I guess there weren't enough instructions that only come
> in 'x' versions to bother with it.  There is a 'Z' constraint, "Memory operand
> that is an indexed or indirect from a register", but I tried it and it can use
> both "rb,ri" and "disp(rb)" forms.  Actually, I'm not sure how 'Z' is any
> different than "m"?

'Z' will never emit a non-zero constant displacement.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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