re PR c++/86953 (compiler crashes with constexpr operator== and specific struct…

re PR c++/86953 (compiler crashes with constexpr operator== and specific struct (cxx_eval_bit_field_ref, at cp/constexpr.c:2704))

	PR c++/86953
	* g++.dg/cpp0x/constexpr-86953.C: New test.

From-SVN: r270396

gcc/testsuite/ChangeLog

+2019-04-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/86953
+	* g++.dg/cpp0x/constexpr-86953.C: New test.
+
 2019-04-16  Dominique d'Humieres  <dominiq@gcc.gnu.org>
 
 	* g++.dg/lto/pr89358_0.C: Replace dg-* with dg-lto-*.

gcc/testsuite/g++.dg/cpp0x/constexpr-86953.C

+// PR c++/86953
+// { dg-do run { target c++11 } }
+// { dg-options "-O2" }
+
+struct B {
+  double x;
+  bool y, z;
+  constexpr bool operator== (const B& o) const noexcept
+  {
+    return x == o.x && y == o.y && z == o.z;
+  }
+  constexpr bool operator!= (const B& o) const noexcept { return !(*this == o); }
+};
+
+int
+main ()
+{
+  bool b = B{} == B{};
+}