[Bug tree-optimization/67221] [6 Regression] ICE at -Os and above on x86_64-linux-gnu: Segmentation fault (program cc1)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67221

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug 17 14:17:33 2015
New Revision: 226938

URL: https://gcc.gnu.org/viewcvs?rev=226938&root=gcc&view=rev
Log:
2015-08-17  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67221
        * tree-ssa-sccvn.c (visit_phi): Keep all-TOP args TOP.
        (sccvn_dom_walker::before_dom_children): Mark backedges of
        non-executable blocks as not executable.

        * gcc.dg/torture/pr67221.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr67221.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c