[Bug tree-optimization/38748] [4.4 Regression] Missed FRE because of VIEW_CONVERT_EXPR

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

------- Comment #8 from rguenth at gcc dot gnu dot org  2009-01-20 17:10 -------
Subject: Bug 38748

Author: rguenth
Date: Tue Jan 20 17:10:40 2009
New Revision: 143523

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143523
Log:
2009-01-20  Andrew Pinski  <andrew_pinski@playstation.sony.com>
        Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/38747
        PR tree-optimization/38748
        * tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Disable the VCE
        conversion if the base address is an indirect reference and the
        aliasing sets could cause issues.

        * gcc.dg/tree-ssa/struct-aliasing-1.c: New test.
        * gcc.dg/tree-ssa/struct-aliasing-2.c: Likewise.
        * gcc.c-torture/execute/struct-aliasing-1.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/struct-aliasing-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/struct-aliasing-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/struct-aliasing-2.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=38748