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[Bug tree-optimization/50272] A case that PRE optimization hurts performance
- From: "liujiangning at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 30 Mar 2012 03:41:42 +0000
- Subject: [Bug tree-optimization/50272] A case that PRE optimization hurts performance
- Auto-submitted: auto-generated
- References: <bug-50272-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50272
Jiangning Liu <liujiangning at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |liujiangning at gcc dot
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--- Comment #5 from Jiangning Liu <liujiangning at gcc dot gnu.org> 2012-03-30 03:41:42 UTC ---
(In reply to comment #4)
> This is still a problem in version 4.7.0 20120225.
http://gcc.gnu.org/ml/gcc/2011-09/msg00342.html
Jeff already gave comments here. The proposed solution is path sensitive
optimization. It seems it's hard to solve this problem in short time.