[Bug tree-optimization/58513] *var and MEM[(const int &)var] (var has int* type) are not treated as the same data ref.

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58513

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Sep 24 11:04:04 2013
New Revision: 202865

URL: http://gcc.gnu.org/viewcvs?rev=202865&root=gcc&view=rev
Log:
2013-09-24  Richard Biener  <rguenther@suse.de>

    PR middle-end/58513
    * tree.c (reference_alias_ptr_type): Move ...
    * alias.c (reference_alias_ptr_type): ... here and implement
    in terms of the new reference_alias_ptr_type_1.
    (ref_all_alias_ptr_type_p): New helper.
    (get_deref_alias_set_1): Drop flag_strict_aliasing here,
    use ref_all_alias_ptr_type_p.
    (get_deref_alias_set): Add flag_strict_aliasing check here.
    (reference_alias_ptr_type_1): New function, split out from ...
    (get_alias_set): ... here.
    (alias_ptr_types_compatible_p): New function.
    * alias.h (reference_alias_ptr_type): Declare.
    (alias_ptr_types_compatible_p): Likewise.
    * tree.h (reference_alias_ptr_type): Remove.
    * fold-const.c (operand_equal_p): Use alias_ptr_types_compatible_p
    to compare MEM_REF alias types.

    * g++.dg/vect/pr58513.cc: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/vect/pr58513.cc
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/alias.c
    trunk/gcc/alias.h
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree.c
    trunk/gcc/tree.h