[Bug tree-optimization/81053] ICE on valid code at -O3 on x86_64-linux-gnu: in as_a, at is-a.h:192

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81053

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Jun 12 10:42:57 2017
New Revision: 249113

URL: https://gcc.gnu.org/viewcvs?rev=249113&root=gcc&view=rev
Log:
2017-06-12  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/81053
        * tree-vect-loop.c (vect_is_simple_reduction): Handle PHI
        with backedge value not defined in loop.  Simplify def stmt
        compute.

        * gcc.dg/torture/pr81053.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr81053.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c