[Bug tree-optimization/38785] [4.5/4.6/4.7/4.8 Regression] huge performance regression on EEMBC bitmnp01

[mkuvyrkov at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38785

--- Comment #30 from Maxim Kuvyrkov <mkuvyrkov at gcc dot gnu.org> 2012-04-28 01:56:59 UTC ---
Author: mkuvyrkov
Date: Sat Apr 28 01:56:54 2012
New Revision: 186928

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186928
Log:
    PR tree-optimization/38785
    * common.opt (ftree-partial-pre): New option.
    * doc/invoke.texi: Document it.
    * opts.c (default_options_table): Initialize flag_tree_partial_pre.
    * tree-ssa-pre.c (do_partial_partial_insertion): Insert only if it will
    benefit speed path.
    (execute_pre): Use flag_tree_partial_pre.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/common.opt
    trunk/gcc/doc/invoke.texi
    trunk/gcc/opts.c
    trunk/gcc/tree-ssa-pre.c