[Bug tree-optimization/67955] tree-dse does not use pointer info

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67955

--- Comment #11 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan  4 19:22:44 2017
New Revision: 244067

URL: https://gcc.gnu.org/viewcvs?rev=244067&root=gcc&view=rev
Log:
        PR tree-optimizatin/67955
        * tree-ssa-alias.c (same_addr_size_stores_p): Check offsets first.
        Allow any SSA_VAR_P as the base objects.  Use integer_zerop.  Verify
        the points-to solution does not include pt_null.  Use DECL_PT_UID
        unconditionally.

        PR tree-optimization/67955
        * gcc.dg/tree-ssa/ssa-dse-28.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-28.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-alias.c