[Bug tree-optimization/47391] [4.5 Regression] read from const volatile incorrectly eliminated

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47391

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-04-07 18:22:54 UTC ---
Author: jakub
Date: Thu Apr  7 18:22:50 2011
New Revision: 172112

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=172112
Log:
    PR tree-optimization/47391
    * tree-ssa-ccp.c (get_symbol_constant_value): Don't optimize
    if sym is volatile.

    Backport from mainline
    2011-01-21  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/47391
    * gcc.dg/pr47391.c: New test.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/pr47391.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-ccp.c