[builtins] Migrate Math.log to TurboFan.

test/unittests/compiler/machine-operator-reducer-unittest.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 "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator-reducer.h"
 #include "src/compiler/typer.h"
 #include "src/conversions-inl.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
 #include "testing/gmock-support.h"
 
 using testing::AllOf;
 using testing::BitEq;
 using testing::Capture;
 using testing::CaptureEq;
+using testing::NanSensitiveDoubleEq;
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class MachineOperatorReducerTest : public TypedGraphTest {
  public:
   explicit MachineOperatorReducerTest(int num_parameters = 2)
       : TypedGraphTest(num_parameters), machine_(zone()) {}
 
@@ skipping 1363 matching lines @@
     Reduction r = Reduce(
         graph()->NewNode(machine()->Float64Mul(), Float64Constant(-1.0), p0));
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(),
                 IsFloat64Sub(IsFloat64Constant(BitEq(-0.0)), p0));
   }
 }
 
 
 // -----------------------------------------------------------------------------
+// Float64Log
+
+TEST_F(MachineOperatorReducerTest, Float64LogWithConstant) {
+  TRACED_FOREACH(double, x, kFloat64Values) {
+    Reduction const r =
+        Reduce(graph()->NewNode(machine()->Float64Log(), Float64Constant(x)));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(),
+                IsFloat64Constant(NanSensitiveDoubleEq(std::log(x))));
+  }
+}
+
+// -----------------------------------------------------------------------------
 // Float64InsertLowWord32
 
-
 TEST_F(MachineOperatorReducerTest, Float64InsertLowWord32WithConstant) {
   TRACED_FOREACH(double, x, kFloat64Values) {
     TRACED_FOREACH(uint32_t, y, kUint32Values) {
       Reduction const r =
           Reduce(graph()->NewNode(machine()->Float64InsertLowWord32(),
                                   Float64Constant(x), Uint32Constant(y)));
       ASSERT_TRUE(r.Changed());
       EXPECT_THAT(
           r.replacement(),
           IsFloat64Constant(BitEq(bit_cast<double>(
@@ skipping 228 matching lines @@
     Reduction r = Reduce(node);
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(),
                 IsStore(rep, base, index, value, effect, control));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8