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Re: [PATCH] Fix PR18754: add early loop pass, 2nd try

From: "Giovanni Bajo" <giovannibajo at libero dot it>
To: "Richard Guenther" <rguenth at tat dot physik dot uni-tuebingen dot de>
Cc: <gcc-patches at gcc dot gnu dot org>
Date: Thu, 20 Jan 2005 14:15:53 +0100
Subject: Re: [PATCH] Fix PR18754: add early loop pass, 2nd try
References: <Pine.LNX.4.44.0501201355500.16464-100000@alwazn.tat.physik.uni-tuebingen.de>

Richard Guenther <rguenth@tat.physik.uni-tuebingen.de> wrote:

>> For instance, if it is a little too expensive we could activate it
>> only at -O3, but I can't see numbers (again) supporting this patch.
>
> The main reason for not enabling this by default is that it may
> interact badly with vectorization according to Dorit.

This is actually not a concern since -ftree-vectorize is disabled by default.
Anyhow, I guess this is a bug in the vectorizer. If this really really comes
into Dorit's way badly, you can always make -ftree-vectorize disable it, but it
really should not be needed.

> I'll get you numbers for
> PR8361 and POOMA once a disable-checking bootstrap completed

Thanks.

Giovanni Bajo

Follow-Ups:
- Re: [PATCH] Fix PR18754: add early loop pass, 2nd try
  - From: Richard Guenther
- Re: [PATCH] Fix PR18754: add early loop pass, 2nd try
  - From: Dorit Naishlos
- Re: [PATCH] Fix PR18754: add early loop pass, 2nd try
  - From: Richard Henderson

References:
- Re: [PATCH] Fix PR18754: add early loop pass, 2nd try
  - From: Richard Guenther

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