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

[law at gcc dot gnu.org]

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

--- Comment #13 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Fri Oct 21 20:41:34 2016
New Revision: 241429

URL: https://gcc.gnu.org/viewcvs?rev=241429&root=gcc&view=rev
Log:
        * PR tree-optimization/71947
        * gcc.dg/tree-ssa/pr71947-4.c: Avoid x86 opcode.
        * gcc.dg/tree-ssa/pr71947-5.c: Likewise.
        * gcc.dg/tree-ssa/pr71947-6.c: Make it opt-in rather than opt-out.

Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-4.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-5.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr71947-6.c