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Subject: [Bug tree-optimization/19431] missed optimization with ifs and deferencing
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------- Comment #18 from rguenth at gcc dot gnu dot org  2007-04-18 12:45 -------
Subject: Bug 19431

Author: rguenth
Date: Wed Apr 18 12:45:09 2007
New Revision: 123946

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123946
Log:
2007-04-18  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/19431
        PR tree-optimization/21463
        * tree-pass.h (pass_phiprop): Declare.
        * passes.c (init_optimization_passes): New phiprop pass.
        * tree-ssa-forwprop.c (struct phiprop_d): New structure.
        (phivn_valid_p): New helper function.
        (phiprop_insert_phi): Likewise.
        (propagate_with_phi): Likewise.
        (tree_ssa_phiprop): New propagator propagating loads
        through phi nodes if profitable.

        * gcc.c-torture/execute/20070212-1.c: New testcase.
        * gcc.c-torture/execute/20070212-2.c: Likewise.
        * gcc.c-torture/execute/20070212-3.c: Likewise.
        * gcc.dg/tree-ssa/pr19431.c: Likewise.
        * gcc.dg/tree-ssa/pr21463.c: Likewise.
        * g++.dg/tree-ssa/pr21463.C: Likewise.
        * g++.dg/tree-ssa/pr30738.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr21463.C
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr30738.C
    trunk/gcc/testsuite/gcc.c-torture/execute/20070212-1.c
    trunk/gcc/testsuite/gcc.c-torture/execute/20070212-2.c
    trunk/gcc/testsuite/gcc.c-torture/execute/20070212-3.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr19431.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr21463.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/passes.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-pass.h
    trunk/gcc/tree-ssa-forwprop.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19431