[Bug tree-optimization/48822] [4.5 Regression] G++ gets stucks and never finishes compilation when enabling -O2/3 optimization options.

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48822

--- Comment #11 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-07-04 
14:24:13 UTC ---
Author: rguenth
Date: Mon Jul  4 14:24:10 2011
New Revision: 175813

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175813
Log:
2011-07-04  Richard Guenther  <rguent...@suse.de>

        Backport from mainline
        2011-05-02  Richard Guenther  <rguent...@suse.de>

    PR tree-optimization/48822
    * tree-ssa-sccvn.c (set_ssa_val_to): Never go up the lattice.

    * gcc.dg/torture/pr48822.c: New testcase.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/torture/pr48822.c
Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_5-branch/gcc/tree-ssa-sccvn.c