[Bug tree-optimization/59597] [4.9 Regression] Performance degradation on Coremark after r205074

[law at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59597

--- Comment #5 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan 22 21:27:38 2014
New Revision: 206941

URL: http://gcc.gnu.org/viewcvs?rev=206941&root=gcc&view=rev
Log:
    PR tree-optimization/59597
    * tree-ssa-threadupdate.c (dump_jump_thread_path): Move to earlier
    in file.  Accept new argument REGISTERING and use it to modify
    dump output appropriately.
    (register_jump_thread): Corresponding changes.
    (mark_threaded_blocks): Reinstate code to cancel unprofitable
    thread paths involving joiner blocks.  Add code to dump cancelled
    jump threading paths.

    PR tree-optimization/59597
    * gcc.dg/tree-ssa/pr59597.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr59597.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadupdate.c