[Bug tree-optimization/19624] PRE pessimizes ivopts

[dberlin at dberlin dot org]

------- Additional Comments From dberlin at gcc dot gnu dot org  2005-01-25 15:35 -------
Subject: Re:  PRE pessimizes ivopts

On Tue, 2005-01-25 at 15:27 +0000, rguenth at tat dot physik dot
uni-tuebingen dot de wrote:
> ------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de  2005-01-25 15:27 -------
> I guess making PRE and ivopts playing nicely together perfectly is near to
> impossible

Yes, hence why i don't plan on promising it :)
There are always optimization interactions that are very very hard to
control or predict.
The best you can do is not make your optimization do things that are
always unprofitable, try to make them interact better where possible,
and hope for the best.

>  - but any improvement in the 4.0 timeframe is welcome!
> 



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19624