[Bug tree-optimization/53844] [4.6/4.7 Regression] GCC generates suboptimal code for unused members of classes in some cases on multiple targets.

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53844

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-04 
12:10:56 UTC ---
Author: rguenth
Date: Wed Jul  4 12:10:40 2012
New Revision: 189256

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189256
Log:
2012-07-04  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/53844
    * tree-ssa-dse.c (dse_possible_dead_store_p): Properly handle
    the loop virtual PHI.

    * g++.dg/tree-ssa/pr53844.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr53844.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dse.c