[Bug tree-optimization/68398] [6 Regression] coremark regression due to r229685

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68398

--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Mon Jan 25 19:19:09 2016
New Revision: 232802

URL: https://gcc.gnu.org/viewcvs?rev=232802&root=gcc&view=rev
Log:
        PR tree-optimization/69196
        PR tree-optimization/68398
        * tree-ssa-threadupdate.h (enum bb_dom_status): Moved here from
        tree-ssa-threadupdate.c.
        (determine_bb_domination_status): Prototype
        * tree-ssa-threadupdate.c (enum bb_dom_status): Remove
        (determine_bb_domination_status): No longer static.
        (valid_jump_thread_path): Remove code to detect characteristics
        of the jump thread path not associated with correctness.
        * tree-ssa-threadbackward.c (fsm_find_control_statment_thread_paths):
        Correct test for thread path length.  Count PHIs for real operands as
        statements that need to be copied.  Do not count ASSERT_EXPRs.
        Look at all the blocks in the thread path.  Compute and selectively
        filter thread paths based on threading through the latch, threading
        a multiway branch or crossing a multiway branch.

        PR tree-optimization/69196
        PR tree-optimization/68398
        * gcc.dg/tree-ssa/pr66752-3.c: Update expected output
        * gcc.dg/tree-ssa/pr68198.c: Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr66752-3.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr68198.c
    trunk/gcc/tree-ssa-threadbackward.c
    trunk/gcc/tree-ssa-threadupdate.c
    trunk/gcc/tree-ssa-threadupdate.h