Optimize the typeof operator.

src/compiler/js-generic-lowering.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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-generic-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 75 matching lines @@
 REPLACE_COMPARE_IC_CALL(JSGreaterThan, Token::GT)
 REPLACE_COMPARE_IC_CALL(JSLessThanOrEqual, Token::LTE)
 REPLACE_COMPARE_IC_CALL(JSGreaterThanOrEqual, Token::GTE)
 #undef REPLACE_COMPARE_IC_CALL
 
 
 #define REPLACE_RUNTIME_CALL(op, fun)             \
   void JSGenericLowering::Lower##op(Node* node) { \
     ReplaceWithRuntimeCall(node, fun);            \
   }
-REPLACE_RUNTIME_CALL(JSTypeOf, Runtime::kTypeof)
 REPLACE_RUNTIME_CALL(JSCreate, Runtime::kAbort)
 REPLACE_RUNTIME_CALL(JSCreateFunctionContext, Runtime::kNewFunctionContext)
 REPLACE_RUNTIME_CALL(JSCreateWithContext, Runtime::kPushWithContext)
 REPLACE_RUNTIME_CALL(JSCreateBlockContext, Runtime::kPushBlockContext)
 REPLACE_RUNTIME_CALL(JSCreateModuleContext, Runtime::kPushModuleContext)
 REPLACE_RUNTIME_CALL(JSCreateScriptContext, Runtime::kNewScriptContext)
 #undef REPLACE_RUNTIME
 
 
 #define REPLACE_UNIMPLEMENTED(op) \
@@ skipping 160 matching lines @@
 }
 
 
 void JSGenericLowering::LowerJSUnaryNot(Node* node) {
   Callable callable = CodeFactory::ToBoolean(
       isolate(), ToBooleanStub::RESULT_AS_INVERSE_ODDBALL);
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
 }
 
 
+void JSGenericLowering::LowerJSTypeOf(Node* node) {
+  Callable callable = CodeFactory::Typeof(isolate());
+  ReplaceWithStubCall(node, callable, CallDescriptor::kNoFlags);
+}
+
+
 void JSGenericLowering::LowerJSToBoolean(Node* node) {
   Callable callable =
       CodeFactory::ToBoolean(isolate(), ToBooleanStub::RESULT_AS_ODDBALL);
   ReplaceWithStubCall(node, callable, CallDescriptor::kPatchableCallSite);
 }
 
 
 void JSGenericLowering::LowerJSToNumber(Node* node) {
   Callable callable = CodeFactory::ToNumber(isolate());
   ReplaceWithStubCall(node, callable, FlagsForNode(node));
@@ skipping 285 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8