[Bug fortran/49103] [4.6/4.7 Regression] local variables exchange values / wrong code with -O3

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49103

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-14 
15:28:27 UTC ---
Author: jakub
Date: Tue Jun 14 15:28:21 2011
New Revision: 175029

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175029
Log:
    PR fortran/49103
    * tree.h (DECL_NONSHAREABLE): Define.
    (struct tree_decl_common): Change decl_common_unused to
    decl_nonshareable_flag.
    * cfgexpand.c (expand_used_vars_for_block, clear_tree_used):
    Ignore vars with DECL_NONSHAREABLE bit set.
    * tree-cfg.c (gimple_duplicate_bb): Set DECL_NONSHAREABLE
    on stores to automatic aggregate vars.

    * gfortran.dg/pr49103.f90: New test.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/gfortran.dg/pr49103.f90
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/cfgexpand.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_6-branch/gcc/tree-cfg.c
    branches/gcc-4_6-branch/gcc/tree.h