[Bug tree-optimization/82060] [7/8 Regression] ICE in refs_may_alias_p_1 with devirtualization enabled

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82060

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Sep  4 10:57:20 2017
New Revision: 251650

URL: https://gcc.gnu.org/viewcvs?rev=251650&root=gcc&view=rev
Log:
2017-09-04  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/82060
        * tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
        Move devirtualization after stmt folding and before EH/AB/noreturn
        cleanup to get the stmt refs canonicalized.  Use a bool instead
        of gimple_modified_p since that doesn't work for NOPs.  Schedule
        NOPs generated by folding for removal.

        * g++.dg/torture/pr82060.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr82060.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c