[Bug tree-optimization/50272] A case that PRE optimization hurts performance

[liujiangning at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50272

Jiangning Liu <liujiangning at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |liujiangning at gcc dot
                   |                            |gnu.org

--- 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.