[turbofan] Introduce proper ObjectIsReceiver operator.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 0132bf9272f8fe86c4afc668d575c7b13ab527fd..7b0545f049f552cf3fab905b1074df77a59a678a 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -1240,6 +1240,12 @@ class RepresentationSelector {
         if (lower()) lowering->DoObjectIsNumber(node);
         break;
       }
+      case IrOpcode::kObjectIsReceiver: {
+        ProcessInput(node, 0, UseInfo::AnyTagged());
+        SetOutput(node, NodeOutputInfo::Bool());
+        if (lower()) lowering->DoObjectIsReceiver(node);
+        break;
+      }
       case IrOpcode::kObjectIsSmi: {
         ProcessInput(node, 0, UseInfo::AnyTagged());
         SetOutput(node, NodeOutputInfo::Bool());
@@ -1583,21 +1589,13 @@ void SimplifiedLowering::DoStoreBuffer(Node* node) {
 void SimplifiedLowering::DoObjectIsNumber(Node* node) {
   Node* input = NodeProperties::GetValueInput(node, 0);
   // TODO(bmeurer): Optimize somewhat based on input type.
-  Node* check =
-      graph()->NewNode(machine()->WordEqual(),
-                       graph()->NewNode(machine()->WordAnd(), input,
-                                        jsgraph()->IntPtrConstant(kSmiTagMask)),
-                       jsgraph()->IntPtrConstant(kSmiTag));
+  Node* check = IsSmi(input);
   Node* branch = graph()->NewNode(common()->Branch(), check, graph()->start());
   Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
   Node* vtrue = jsgraph()->Int32Constant(1);
   Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
   Node* vfalse = graph()->NewNode(
-      machine()->WordEqual(),
-      graph()->NewNode(
-          machine()->Load(MachineType::AnyTagged()), input,
-          jsgraph()->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag),
-          graph()->start(), if_false),
+      machine()->WordEqual(), LoadHeapObjectMap(input, if_false),
       jsgraph()->HeapConstant(isolate()->factory()->heap_number_map()));
   Node* control = graph()->NewNode(common()->Merge(2), if_true, if_false);
   node->ReplaceInput(0, vtrue);
@@ -1607,6 +1605,27 @@ void SimplifiedLowering::DoObjectIsNumber(Node* node) {
 }
 
 
+void SimplifiedLowering::DoObjectIsReceiver(Node* node) {
+  Node* input = NodeProperties::GetValueInput(node, 0);
+  // TODO(bmeurer): Optimize somewhat based on input type.
+  STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
+  Node* check = IsSmi(input);
+  Node* branch = graph()->NewNode(common()->Branch(), check, graph()->start());
+  Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
+  Node* vtrue = jsgraph()->Int32Constant(0);
+  Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
+  Node* vfalse =
+      graph()->NewNode(machine()->Uint32LessThanOrEqual(),
+                       jsgraph()->Uint32Constant(FIRST_JS_RECEIVER_TYPE),
+                       LoadMapInstanceType(LoadHeapObjectMap(input, if_false)));
+  Node* control = graph()->NewNode(common()->Merge(2), if_true, if_false);
+  node->ReplaceInput(0, vtrue);
+  node->AppendInput(graph()->zone(), vfalse);
+  node->AppendInput(graph()->zone(), control);
+  NodeProperties::ChangeOp(node, common()->Phi(MachineRepresentation::kBit, 2));
+}
+
+
 void SimplifiedLowering::DoObjectIsSmi(Node* node) {
   node->ReplaceInput(0,
                      graph()->NewNode(machine()->WordAnd(), node->InputAt(0),
@@ -1616,6 +1635,31 @@ void SimplifiedLowering::DoObjectIsSmi(Node* node) {
 }
 
 
+Node* SimplifiedLowering::IsSmi(Node* value) {
+  return graph()->NewNode(
+      machine()->WordEqual(),
+      graph()->NewNode(machine()->WordAnd(), value,
+                       jsgraph()->IntPtrConstant(kSmiTagMask)),
+      jsgraph()->IntPtrConstant(kSmiTag));
+}
+
+
+Node* SimplifiedLowering::LoadHeapObjectMap(Node* object, Node* control) {
+  return graph()->NewNode(
+      machine()->Load(MachineType::AnyTagged()), object,
+      jsgraph()->IntPtrConstant(HeapObject::kMapOffset - kHeapObjectTag),
+      graph()->start(), control);
+}
+
+
+Node* SimplifiedLowering::LoadMapInstanceType(Node* map) {
+  return graph()->NewNode(
+      machine()->Load(MachineType::Uint8()), map,
+      jsgraph()->IntPtrConstant(Map::kInstanceTypeOffset - kHeapObjectTag),
+      graph()->start(), graph()->start());
+}
+
+
 Node* SimplifiedLowering::StringComparison(Node* node) {
   Operator::Properties properties = node->op()->properties();
   Callable callable = CodeFactory::StringCompare(isolate());