Reland "Introduce intrinsics for double values in Javascript."

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 5324ef39cb320f0662ffbefec360cf87a4bf93f8..25fc74973a8a721c0c3afdffbd76722d6026c5bc 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10509,6 +10509,35 @@ void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
 }
 
 
+void HOptimizedGraphBuilder::GenerateDoubleLo(CallRuntime* call) {
+  ASSERT_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HInstruction* result = NewUncasted<HDoubleBits>(value, HDoubleBits::LOW);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
+void HOptimizedGraphBuilder::GenerateDoubleHi(CallRuntime* call) {
+  ASSERT_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HInstruction* result = NewUncasted<HDoubleBits>(value, HDoubleBits::HIGH);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
+void HOptimizedGraphBuilder::GenerateConstructDouble(CallRuntime* call) {
+  ASSERT_EQ(2, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
+  HValue* lo = Pop();
+  HValue* hi = Pop();
+  HInstruction* result = NewUncasted<HConstructDouble>(hi, lo);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 // Construct a RegExp exec result with two in-object properties.
 void HOptimizedGraphBuilder::GenerateRegExpConstructResult(CallRuntime* call) {
   ASSERT_EQ(3, call->arguments()->length());