[Bug tree-optimization/69196] [5/6 Regression] code size regression with jump threading at -O2

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69196

--- Comment #13 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Tue Mar  1 21:46:58 2016
New Revision: 233866

URL: https://gcc.gnu.org/viewcvs?rev=233866&root=gcc&view=rev
Log:
        PR tree-optimization/69196
        * tree-ssa-threadbackward.c (fsm_find_control_statement_thread_paths):
        Do count some PHIs in the thread path against the insn count.  Decrease
        final statement count by one as the control statement in the last
        block will get removed.  Remove special cased code for handling PHIs   
        in the last block.

        PR tree-optimization/69196
        * gcc.dg/tree-ssa/vrp46.c: Twiddle threading params to keep it from
        duplicating code and spoiling the expected output.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp46.c
    trunk/gcc/tree-ssa-threadbackward.c