[builtins] Migrate Math.log 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.
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 5477 matching lines @@
   FOR_FLOAT32_INPUTS(i) { CHECK_FLOAT_EQ(std::abs(*i), m.Call(*i)); }
 }
 
 
 TEST(RunFloat64Abs) {
   BufferedRawMachineAssemblerTester<double> m(MachineType::Float64());
   m.Return(m.Float64Abs(m.Parameter(0)));
   FOR_FLOAT64_INPUTS(i) { CHECK_DOUBLE_EQ(std::abs(*i), m.Call(*i)); }
 }
 
+TEST(RunFloat64Log) {
+  BufferedRawMachineAssemblerTester<double> m(MachineType::Float64());
+  m.Return(m.Float64Log(m.Parameter(0)));
+  CHECK(std::isnan(m.Call(std::numeric_limits<double>::quiet_NaN())));

[ahaas, 2016/06/03 09:32:49]

Aren't these checks included in the FOR_FLOAT64_INPUTS anyways?

[Benedikt Meurer, 2016/06/03 09:40:28]

Yes, but I want to make them explicit. These are the cases that explicitly
listed in the spec.

+  CHECK(std::isnan(m.Call(std::numeric_limits<double>::signaling_NaN())));
+  CHECK(std::isnan(m.Call(-std::numeric_limits<double>::infinity())));
+  CHECK(std::isnan(m.Call(-1.0)));
+  CHECK_DOUBLE_EQ(-std::numeric_limits<double>::infinity(), m.Call(-0.0));
+  CHECK_DOUBLE_EQ(-std::numeric_limits<double>::infinity(), m.Call(0.0));
+  CHECK_DOUBLE_EQ(0.0, m.Call(1.0));
+  CHECK_DOUBLE_EQ(std::numeric_limits<double>::infinity(),
+                  m.Call(std::numeric_limits<double>::infinity()));
+  FOR_FLOAT64_INPUTS(i) { CHECK_DOUBLE_EQ(std::log(*i), m.Call(*i)); }
+}
 
 static double two_30 = 1 << 30;             // 2^30 is a smi boundary.
 static double two_52 = two_30 * (1 << 22);  // 2^52 is a precision boundary.
 static double kValues[] = {0.1,
                            0.2,
                            0.49999999999999994,
                            0.5,
                            0.7,
                            1.0 - std::numeric_limits<double>::epsilon(),
                            -0.1,
@@ skipping 750 matching lines @@
   r.Goto(&merge);
   r.Bind(&merge);
   Node* phi = r.Phi(MachineRepresentation::kWord32, fa, fb);
   r.Return(phi);
   CHECK_EQ(1, r.Call(1));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8