[Bug tree-optimization/38926] [4.4 Regression] ice in find_or_generate_expression, at tree-ssa-pre.c:2769

["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  2009-01-28 12:14 -------
Subject: Bug 38926

Author: rguenth
Date: Wed Jan 28 12:14:09 2009
New Revision: 143725

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143725
Log:
2009-01-28  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/38926
        * tree-ssa-pre.c (add_to_value): Assert we add only expressions
        with the correct value id to a value.
        (do_regular_insertion): Use the value number of edoubleprime
        for the value number of the expr.

        Revert
        2008-08-21  Richard Guenther  <rguenther@suse.de>

        * tree-ssa-pre.c (insert_into_preds_of_block): Before inserting
        a PHI ask VN if it is already available.
        * tree-ssa-sccvn.h (vn_phi_lookup): Declare.
        * tree-ssa-sccvn.c (vn_phi_lookup): Export.

        * gcc.c-torture/compile/pr38926.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr38926.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c
    trunk/gcc/tree-ssa-sccvn.h


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38926