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Subject: [Bug tree-optimization/39074] [4.2/4.3/4.4 Regression] PTA constraint processing for *x = y is wrong
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------- Comment #16 from rguenth at gcc dot gnu dot org  2009-02-06 09:17 -------
Subject: Bug 39074

Author: rguenth
Date: Fri Feb  6 09:17:19 2009
New Revision: 143983

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143983
Log:
2009-02-06  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/39074
        * tree-ssa-structalias.c (storedanything_id, var_storedanything,
        storedanything_tree): New.
        (do_ds_constraint): Simplify ANYTHING shortcutting.  Update
        the STOREDANYTHING solution if the lhs solution contains
        ANYTHING.
        (build_pred_graph): Add edges from STOREDANYTHING to all
        non-direct nodes.
        (get_constraint_for_1): CONSTRUCTOR
        is a zero-initializer.  Generate &NOTHING for it.
        (init_base_vars): Initialize STOREDANYTHING.
        (compute_points_to_sets): Free substitution info after
        building the succ graph.
        (ipa_pta_execute): Likewise.

        * gcc.dg/torture/pr39074.c: New testcase.
        * gcc.dg/torture/pr39074-2.c: Likewise.
        * gcc.dg/torture/pr39074-3.c: Likewise.

Added:
    branches/alias-improvements/gcc/testsuite/gcc.dg/torture/pr39074-2.c
    branches/alias-improvements/gcc/testsuite/gcc.dg/torture/pr39074-3.c
    branches/alias-improvements/gcc/testsuite/gcc.dg/torture/pr39074.c
Modified:
    branches/alias-improvements/gcc/ChangeLog.alias
    branches/alias-improvements/gcc/tree-ssa-structalias.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39074