[Bug tree-optimization/71661] [7 Regression] wrong code at -O3

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71661

--- Comment #8 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Oct  6 16:23:22 2016
New Revision: 240836

URL: https://gcc.gnu.org/viewcvs?rev=240836&root=gcc&view=rev
Log:
        PR tree-optimization/71661
        * tree-cfgcleanup.c (remove_forwarder_block_with_phi): Handle case when
        removal of a forwarder exposes a new natural loop.

        PR tree-optimization/71661
        * gcc.dg/tree-ssa/pr71661.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71661.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-cfgcleanup.c