[Bug middle-end/32946] [4.3 Regression] ICE with -fpredictive-commoning in build_classic_dist_vector_1

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

------- Comment #7 from jakub at gcc dot gnu dot org  2007-08-23 23:30 -------
Subject: Bug 32946

Author: jakub
Date: Thu Aug 23 23:29:57 2007
New Revision: 127750

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=127750
Log:
        PR tree-optimization/32573
        PR middle-end/32946
        * tree-data-ref.c (initialize_data_dependence_relation): Clear
        DDR_SUBSCRIPTS, DDR_DIR_VECTS and DDR_DIST_VECTS at the beginning.
        (finalize_ddr_dependent): Clear DDR_SUBSCRIPTS after freeing it.
        (build_classic_dist_vector): Return false rather than true if
        DDR_ARE_DEPENDENT is non-NULL at the beginning.  Return false
        if either subscript_dependence_tester_1 or build_classic_dist_vector_1
        returned false.  Don't call save_dist_v before calling
        build_classic_dist_vector_1.
        (free_dependence_relation): Don't guard freeing DDR_SUBSCRIPTS
        with NULL DDR_ARE_DEPENDENT.  Also free DDR_DIST_VECTS and/or
        DDR_DIR_VECTS vectors.

        * gcc.dg/pr32573.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr32573.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-data-ref.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32946