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Re: How can I write an empty conversion instruction

From: Richard Henderson <rth at redhat dot com>
To: Richard Earnshaw <rearnsha at gcc dot gnu dot org>
Cc: Steve Ellcey <sje at cup dot hp dot com>, gcc at gcc dot gnu dot org
Date: Mon, 9 May 2005 09:11:59 -0700
Subject: Re: How can I write an empty conversion instruction
References: <200505062059.NAA19579@hpsje.cup.hp.com> <20050507031445.GB23300@redhat.com> <1115638848.25452.10.camel@pc960.cambridge.arm.com>

On Mon, May 09, 2005 at 12:40:48PM +0100, Richard Earnshaw wrote:
> > The best way is to have a post-reload splitter that splits the insn
> > into nothing at all.
> 
> Is that really valid?  I would have thought it would break the data flow.

Obviously you only split to nothing when the registers match.
But we don't have mode correspondence between successive register
apperances after reload.

r~

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