[Bug tree-optimization/86991] [8 Regression] ICE in vectorizable_reduction, at tree-vect-loop.c:6919

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86991

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Feb  8 14:38:31 2019
New Revision: 268699

URL: https://gcc.gnu.org/viewcvs?rev=268699&root=gcc&view=rev
Log:
2019-02-08  Richard Biener  <rguenther@suse.de>

        Backport from mainline
        2018-11-13  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/86991
        * tree-vect-loop.c (vect_is_slp_reduction): Delay reduction
        group building until we have successfully detected the SLP
        reduction.
        (vect_is_simple_reduction): Remove fixup code here.

        * gcc.dg/pr86991.c: New testcase.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/pr86991.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
    branches/gcc-8-branch/gcc/tree-vect-loop.c