[turbofan] Added the optional Float64RoundTiesEven operator to turbofan.

test/cctest/compiler/test-run-machops.cc

 // Copyright 2014 the V8 project authors. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 // TODO(jochen): Remove this after the setting is turned on globally.
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <cmath>
 #include <functional>
 #include <limits>
@@ skipping 5158 matching lines @@
 
 TEST(RunFloat64RoundUp) {
   BufferedRawMachineAssemblerTester<double> m(kMachFloat64);
   if (!m.machine()->Float64RoundUp().IsSupported()) return;
   m.Return(m.Float64RoundUp(m.Parameter(0)));
 
   FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(std::ceil(*i), m.Call(*i)); }
 }
 
 
+TEST(RunFloat64RoundTiesEven) {
+  BufferedRawMachineAssemblerTester<double> m(kMachFloat64);
+  if (!m.machine()->Float64RoundTiesEven().IsSupported()) return;
+  m.Return(m.Float64RoundTiesEven(m.Parameter(0)));
+
+  FOR_FLOAT64_INPUTS(i) { CheckDoubleEq(nearbyint(*i), m.Call(*i)); }
+}
+
+
 TEST(RunFloat64RoundTruncate) {
   BufferedRawMachineAssemblerTester<double> m(kMachFloat64);
   if (!m.machine()->Float64RoundTruncate().IsSupported()) return;
   m.Return(m.Float64RoundTruncate(m.Parameter(0)));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     CHECK_EQ(trunc(kValues[i]), m.Call(kValues[i]));
   }
 }
 
 
@@ skipping 415 matching lines @@
   Node* call = r.AddNode(r.common()->Call(desc), phi);
   r.Return(call);
 
   CHECK_EQ(33, r.Call(1));
   CHECK_EQ(44, r.Call(0));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8