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Subject: [Bug tree-optimization/50078] [4.6 Regression] combine wrong code: volatile accesses optimized out
Date: Fri, 09 Dec 2011 11:34:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50078

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-09 11:32:40 UTC ---
Author: jakub
Date: Fri Dec  9 11:32:35 2011
New Revision: 182157

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182157
Log:
    Backport from mainline
    2011-12-08  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/51466
    * tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Also copy
    TREE_SIDE_EFFECTS.

    * gcc.c-torture/execute/pr51466.c: New test.

    2011-11-28  Jakub Jelinek  <jakub@redhat.com>

    PR tree-optimization/50078
    * tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Copy over
    TREE_THIS_VOLATILE also from the old to new lhs resp. rhs.

    * gcc.dg/pr50078.c: New test.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/gcc.c-torture/execute/pr51466.c
    branches/gcc-4_6-branch/gcc/testsuite/gcc.dg/pr50078.c
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_6-branch/gcc/tree-ssa-forwprop.c