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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: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
- Cc: Zdenek Dvorak <dvorakz at suse dot de>, gcc at gcc dot gnu dot org, Michael Matz <matz at suse dot de>
- Date: Wed, 22 Dec 2004 00:33:16 +0100
- Subject: Re: Serious performance regression -- some tree optimizer questions
Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz> wrote on 12/21/2004
05:27:11 PM:
> > It would appear to be correct to set the CHREC_NO_OVERFLOW flag
> > on the result of chrec_fold_plus, say, if the inputs are either
> > invariant or themselves cannot overflow, and the current data type
> > is also such that the operation to be folded cannot overflow.
>
> yes, I plan to do this now.
Excellent, thanks!
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
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