[Bug tree-optimization/71947] [6/7 Regression] x ^ y not folded to 0 if x == y by DOM

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71947

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jul 21 13:00:32 2016
New Revision: 238591

URL: https://gcc.gnu.org/viewcvs?rev=238591&root=gcc&view=rev
Log:
2016-07-21  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/71947
        * tree-vrp.c (extract_range_from_assert): Singleton symbolic
        ranges have useful limit_vr information.

        * gcc.dg/tree-ssa/vrp102.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp102.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c