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[Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
- From: "hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Jun 2007 02:00:01 -0000
- Subject: [Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop
- References: <bug-32183-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from hjl at lucon dot org 2007-06-02 02:00 -------
(In reply to comment #11)
> (In reply to comment #10)
> > I will try to track down which checkin causes this.
> No need, it was just the addition of DCE. So what is happening now is that DCE
> removes the other use of the multiply so reassiocation can happen and then
> reassiocation just happens to make it worse than it was before.
>
Has anyone measured impact of adding DCE on SPEC CPU 2000/2006 peformance?
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183