[Bug tree-optimization/81573] [8 Regression] wrong code at -O3 on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81573

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jul 27 13:46:07 2017
New Revision: 250627

URL: https://gcc.gnu.org/viewcvs?rev=250627&root=gcc&view=rev
Log:
2017-07-27  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/81573
        PR tree-optimization/81494
        * tree-vect-loop.c (vect_create_epilog_for_reduction): Handle
        multi defuse cycle case.

        * gcc.dg/torture/pr81573.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr81573.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c