[Bug tree-optimization/84830] [8 Regression] ICE in compute_antic, at tree-ssa-pre.c:2388

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84830

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Mar 14 08:07:45 2018
New Revision: 258514

URL: https://gcc.gnu.org/viewcvs?rev=258514&root=gcc&view=rev
Log:
2018-03-14  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/84830
        * tree-ssa-pre.c (compute_antic_aux): Intersect the new ANTIC_IN
        with the old one to avoid oscillations.

        * gcc.dg/torture/pr84830.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr84830.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c