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Re: [tree-ssa] Loop header copying on trees

From: Richard Henderson <rth at redhat dot com>
To: law at redhat dot com
Cc: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>, Diego Novillo <dnovillo at redhat dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Mon, 16 Feb 2004 05:14:20 -0800
Subject: Re: [tree-ssa] Loop header copying on trees
References: <20040216114318.GA4409@atrey.karlin.mff.cuni.cz> <200402161156.i1GBu79S002012@speedy.slc.redhat.com>

On Mon, Feb 16, 2004 at 04:56:06AM -0700, law@redhat.com wrote:
> Funny -- we experimented with that a while back and we actually got
> more compact code copying loop headers!

Only because otherwise we couldn't figure out the initial entry test
optimizes away.  That is no longer true with your jump threading
improvements.  The proposition will have to be re-examined, and I
wouldn't be surprised if it's now true.

r~

Follow-Ups:
- Re: [tree-ssa] Loop header copying on trees
  - From: Jan Hubicka

References:
- Re: [tree-ssa] Loop header copying on trees
  - From: Zdenek Dvorak
- Re: [tree-ssa] Loop header copying on trees
  - From: law

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