[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

test/unittests/compiler/js-intrinsic-lowering-unittest.cc

Index: test/unittests/compiler/js-intrinsic-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
index 20d5c069fe295dc8f47c6895674026fb8857dd60..cb044afe4c6c08e078aeb59b3779e73b6a53e72a 100644
--- a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
+++ b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
@@ -42,6 +42,62 @@ class JSIntrinsicLoweringTest : public GraphTest {
 
 
 // -----------------------------------------------------------------------------
+// %_ConstructDouble
+
+
+TEST_F(JSIntrinsicLoweringTest, InlineOptimizedConstructDouble) {
+  Node* const input0 = Parameter(0);
+  Node* const input1 = Parameter(1);
+  Node* const context = Parameter(2);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r = Reduce(graph()->NewNode(
+      javascript()->CallRuntime(Runtime::kInlineOptimizedConstructDouble, 2),
+      input0, input1, context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(
+      r.replacement(),
+      IsFloat64InsertWord32(
+          1, IsFloat64InsertWord32(0, IsNumberConstant(BitEq(0.0)), input1),
+          input0));
+}
+
+
+// -----------------------------------------------------------------------------
+// %_DoubleLo
+
+
+TEST_F(JSIntrinsicLoweringTest, InlineOptimizedDoubleLo) {
+  Node* const input = Parameter(0);
+  Node* const context = Parameter(1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r = Reduce(graph()->NewNode(
+      javascript()->CallRuntime(Runtime::kInlineOptimizedDoubleLo, 1), input,
+      context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), IsFloat64ExtractWord32(0, input));
+}
+
+
+// -----------------------------------------------------------------------------
+// %_DoubleHi
+
+
+TEST_F(JSIntrinsicLoweringTest, InlineOptimizedDoubleHi) {
+  Node* const input = Parameter(0);
+  Node* const context = Parameter(1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r = Reduce(graph()->NewNode(
+      javascript()->CallRuntime(Runtime::kInlineOptimizedDoubleHi, 1), input,
+      context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), IsFloat64ExtractWord32(1, input));
+}
+
+
+// -----------------------------------------------------------------------------
 // %_IsSmi