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Re: Yet another DOM memory improvement

From: Jeffrey A Law <law at redhat dot com>
To: Jan Hubicka <hubicka at ucw dot cz>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 22 Sep 2004 09:04:11 -0600
Subject: Re: Yet another DOM memory improvement
Organization: Red Hat, Inc
References: <1095826282.10950.408.camel@localhost.localdomain> <20040922145556.GB5342@atrey.karlin.mff.cuni.cz>
Reply-to: law at redhat dot com

On Wed, 2004-09-22 at 08:55, Jan Hubicka wrote:
> The DOM iteration seems to be pretty expensive thing.  Did you
> considered trottling it to 1 iteration by -fexpensive-optimizations so
> it is disabled for -O1?
As I've said before, I'm looking into avoiding the iteration step
completely.  However, that's not going to get into GCC 4.

If you want to throttle it so that the iteration step doesn't
happen unless -fexpensive-optimizations, then that's fine.  Or
better yet, use the existing switch for controlling the dominator
pass.  ie, instead of on/off, off, max # of iterations.

jeff

References:
- Yet another DOM memory improvement
  - From: Jeffrey A Law
- Re: Yet another DOM memory improvement
  - From: Jan Hubicka

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