[Interpreter] Transform StrictEquality with null/undefined to special bytecodes.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 525780575224d6df06364a6f2c688aea0068da15..bd6af49936db092999561d78a634b5bb3ebd3a99 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -1950,6 +1950,53 @@ void Interpreter::DoTestUndetectable(InterpreterAssembler* assembler) {
   __ Dispatch();
 }
 
+// TestNull <src>
+//
+// Test if the value in the <src> register is strictly equal to Null.

[rmcilroy, 2016/12/14 18:50:00]

nit Null -> null

[mythria, 2016/12/15 09:27:39]

Done.

+void Interpreter::DoTestNull(InterpreterAssembler* assembler) {
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* object = __ LoadRegister(reg_index);
+  Node* null_value = __ HeapConstant(isolate_->factory()->null_value());
+
+  Label equal(assembler), end(assembler);
+  __ GotoIf(__ WordEqual(object, null_value), &equal);
+  __ SetAccumulator(__ BooleanConstant(false));
+  __ Goto(&end);
+
+  __ Bind(&equal);
+  {
+    __ SetAccumulator(__ BooleanConstant(true));
+    __ Goto(&end);
+  }
+
+  __ Bind(&end);
+  __ Dispatch();
+}
+
+// TestUndefined <src>
+//
+// Test if the value in the <src> register is strictly equal to Undefined.

[rmcilroy, 2016/12/14 18:50:00]

nit - Undefined -> undefined.

[mythria, 2016/12/15 09:27:39]

Done.

+void Interpreter::DoTestUndefined(InterpreterAssembler* assembler) {
+  Node* reg_index = __ BytecodeOperandReg(0);
+  Node* object = __ LoadRegister(reg_index);
+  Node* undefined_value =
+      __ HeapConstant(isolate_->factory()->undefined_value());
+
+  Label equal(assembler), end(assembler);
+  __ GotoIf(__ WordEqual(object, undefined_value), &equal);
+  __ SetAccumulator(__ BooleanConstant(false));
+  __ Goto(&end);
+
+  __ Bind(&equal);
+  {
+    __ SetAccumulator(__ BooleanConstant(true));
+    __ Goto(&end);
+  }
+
+  __ Bind(&end);
+  __ Dispatch();
+}
+
 // Jump <imm>
 //
 // Jump by number of bytes represented by the immediate operand |imm|.