linux-kernel - Re: [patch 4/7] Immediate Values

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Message-ID: <46F050E8.5020206@goop.org>
Date:	Tue, 18 Sep 2007 15:27:52 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@....de>, Chuck Ebbert <cebbert@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [patch 4/7] Immediate Values - i386 Optimization

H. Peter Anvin wrote:
> Allowing different registers should be doable, but if so, one would have
> to put 0: at the *end* of the instruction and use (0f)-4 instead, since
> the non-%eax forms are one byte longer.
>   

OK, that's already a problem since its using "=r" as the constraint.

> This also seems "safer", since an imm32 is always the last thing in the
> instruction.

Good idea.  If gas/gcc generates entirely the wrong addressing mode,
then we've got bigger problems.

    J
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