[Bug tree-optimization/67816] [6 Regression] ICE in duplicate_thread_path, 186.crafty fails to build

["law at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67816

--- Comment #13 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Oct  7 02:25:57 2015
New Revision: 228559

URL: https://gcc.gnu.org/viewcvs?rev=228559&root=gcc&view=rev
Log:
[PATCH][PR tree-optimization/67816] Fix jump threading when DOM removes
conditionals in jump threading path

        PR tree-optimization/67816
        * tree-ssa-threadupdate.h (remove_jump_threads_including): Renamed
        from remove_jump_threads_starting_at.  Accept an edge rather than
        a basic block.
        * tree-ssa-threadupdate.c (removed_edges): New hash table.
        (remove_jump_threads_including): Note edges that get removed from
        the CFG for later pruning of jump threading paths including them.
        (thread_through_all_blocks): Remove paths which include edges that
        have been removed.
        * tree-ssa-dom.c (optimize_stmt): Call remove_jump_threads_including
        on each outgoing edges when optimizing away a control statement.

        * gcc.c-torture/compile/pr67816.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr67816.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c
    trunk/gcc/tree-ssa-threadupdate.c
    trunk/gcc/tree-ssa-threadupdate.h