[Bug tree-optimization/50078] [4.6 Regression] combine wrong code: volatile accesses optimized out

[xguo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50078

--- Comment #16 from xuepeng guo <xguo at gcc dot gnu.org> 2012-06-11 09:51:12 UTC ---
Author: xguo
Date: Mon Jun 11 09:51:05 2012
New Revision: 188383

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188383
Log:
2012-06-11  Terry Guo  <terry.guo@arm.com>

        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.

        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.

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