[Bug tree-optimization/81500] [8 Regression] ICE with -O3 in process_use, at tree-vect-stmts.c:506

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81500

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Jul 21 11:32:01 2017
New Revision: 250423

URL: https://gcc.gnu.org/viewcvs?rev=250423&root=gcc&view=rev
Log:
2017-06-21  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/81500
        * tree-vect-loop.c (vect_is_simple_reduction): Properly fail if
        we didn't identify a reduction path.

        * gcc.dg/torture/pr81500.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr81500.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c