[Bug tree-optimization/31146] forwprop does not look through casts

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

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-03-16 10:11 -------
Subject: Bug 31146

Author: rguenth
Date: Fri Mar 16 10:11:14 2007
New Revision: 122985

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=122985
Log:
2007-03-16  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/31146
        * tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Restructure
        to allow recursion of forward_propagate_addr_expr.
        (forward_propagate_addr_into_variable_array_index): Likewise.
        (forward_propagate_addr_expr): Likewise.
        (tree_ssa_forward_propagate_single_use_vars): Likewise.
        (forward_propagate_addr_expr_1): Recurse on simple copies
        instead of propagating into them.  Do so for useless conversions
        as well.
        (forward_propagate_addr_expr): Clean up unused statements after
        recursion.

        * g++.dg/tree-ssa/pr31146.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr31146.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-forwprop.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31146