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Re: Serious performance regression -- some tree optimizer questions
- From: Ulrich Weigand <Ulrich dot Weigand at de dot ibm dot com>
- To: Daniel Berlin <dberlin at dberlin dot org>
- Cc: gcc at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
- Date: Mon, 20 Dec 2004 00:24:06 +0100
- Subject: Re: Serious performance regression -- some tree optimizer questions
Daniel Berlin <dberlin@dberlin.org> wrote on 12/18/2004 02:10:38 AM:
> I've attached a patch that will do the optimization you request.
Thanks for looking into this!
> It should, however, work for your testcase.
Indeed it does, the combinations I was requesting are performed now.
Unfortunately the different set of temporaries now generated appear
to trigger some other suboptimal behaviour of ivopts, so the end result
is still quite bad (even with Zdenek's patch) -- I'll have to
investigate this further ...
Bye,
Ulrich
--
Dr. Ulrich Weigand
Linux for S/390 Design & Development
IBM Deutschland Entwicklung GmbH, Schoenaicher Str. 220, 71032 Boeblingen
Phone: +49-7031/16-3727 --- Email: Ulrich.Weigand@de.ibm.com