[Bug tree-optimization/81165] [8 Regression] Regression in GCC-8.0.0's optimizer

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81165

--- Comment #17 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Dec 15 22:11:06 2017
New Revision: 255724

URL: https://gcc.gnu.org/viewcvs?rev=255724&root=gcc&view=rev
Log:
        PR tree-optimization/81165
        * tree-ssa-threadupdate.c (uses_in_bb): New.
        (estimate_threading_killed_stmts): New.
        * tree-ssa-threadupdate.h (estimate_threading_killed_stmts): Prototype.
        * tree-ssa-threadedge.c
        (record_temporary_equivalences_from_stmts_at_dest): Expand limit
        when its hit.

        PR tree-optimization/81165
        * gcc.dg/pr81165.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/pr81165.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-threadedge.c
    trunk/gcc/tree-ssa-threadupdate.c
    trunk/gcc/tree-ssa-threadupdate.h