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

[jiangning.liu at arm dot com]

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

--- Comment #1 from Jiangning Liu <jiangning.liu at arm dot com> 2011-09-02 05:11:38 UTC ---
Richard gave some analysis at http://gcc.gnu.org/ml/gcc/2011-08/msg00037.html