[Bug tree-optimization/32921] [4.3/4.4 Regression] Revision 126326 causes 12% slowdown

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

------- Comment #41 from rguenth at gcc dot gnu dot org  2008-04-23 14:09 -------
Subject: Bug 32921

Author: rguenth
Date: Wed Apr 23 14:08:25 2008
New Revision: 134598

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=134598
Log:
2008-04-23  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/27799
        PR tree-optimization/32921
        PR tree-optimization/32624
        * tree-ssa-structalias.c (merge_smts_into): Only merge the
        SMTs aliases and the tag itself into the solution.
        * tree-ssa-alias.c (compute_flow_sensitive_aliasing): Do not
        merge the points-to solution back into the SMT aliases.
        (may_alias_p): Use alias_set_subset_of instead of
        aliases_conflict_p.  A pointer which points to
        memory with alias set zero may access any variable.

        * gcc.dg/tree-ssa/pr27799.c: New testcase.
        * gcc.dg/tree-ssa/20030807-7.c: Remove xfail, scan vrp dump.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr27799.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/20030807-7.c
    trunk/gcc/tree-ssa-alias.c
    trunk/gcc/tree-ssa-structalias.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32921