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[Bug tree-optimization/28868] [4.3/4.4/4.5 Regression] Not eliminating the PHIs which have the same arguments



------- Comment #19 from rguenth at gcc dot gnu dot org  2009-04-06 14:55 -------
Subject: Bug 28868

Author: rguenth
Date: Mon Apr  6 14:55:31 2009
New Revision: 145607

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=145607
Log:
2009-04-06  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/28868
        * tree-ssa-pre.c (inserted_phi_names): New bitmap to keep track
        of which PHI results we inserted.
        (insert_into_preds_of_block): Record inserted PHIs.
        (eliminate): Eliminate redundant PHI nodes.
        (init_pre): Init inserted_phi_names.

        * gcc.dg/tree-ssa/ssa-fre-21.c: New testcase.
        * gcc.dg/tree-ssa/ssa-sccvn-1.c: Adjust.
        * gcc.dg/tree-ssa/ssa-sccvn-2.c: Likewise.
        * gcc.dg/tree-ssa/ssa-sccvn-4.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-23.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-sccvn-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-sccvn-2.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-sccvn-4.c
    trunk/gcc/tree-ssa-pre.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28868


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