[Bug tree-optimization/34172] Missed store ccp optimization

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

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-03-14 17:06 -------
Subject: Bug 34172

Author: rguenth
Date: Fri Mar 14 17:05:48 2008
New Revision: 133222

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133222
Log:
2008-03-14  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/34172
        * tree-flow.h (refs_may_alias_p): Declare.
        (get_single_def_stmt): Likewise.
        (get_single_def_stmt_from_phi): Likewise.
        (get_single_def_stmt_with_phi): Likewise.
        * tree-dfa.c (refs_may_alias_p): New function.
        (get_single_def_stmt): Likewise.
        (get_single_def_stmt_from_phi): Likewise.
        (get_single_def_stmt_with_phi): Likewise.
        * tree-ssa-sccvn.c (get_def_ref_stmt_vuses): New function.
        (vn_reference_lookup_1): New helper function.
        (vn_reference_lookup): Walk the virtual use-def chain to
        continue searching for a match if the def does not alias the
        reference we are looking for.

        * gcc.dg/tree-ssa/ssa-fre-11.c: New testcase.
        * gcc.dg/tree-ssa/ssa-fre-12.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-13.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-14.c: Likewise.
        * gcc.dg/tree-ssa/ssa-fre-15.c: Likewise.
        * gcc.dg/tree-ssa/20031106-4.c: Remove XFAIL.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-11.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-12.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-13.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-14.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-15.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/20031106-4.c
    trunk/gcc/tree-dfa.c
    trunk/gcc/tree-flow.h
    trunk/gcc/tree-ssa-sccvn.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34172