Micro-optimize lookupiterator: faster path for fast-mode objects

src/objects-inl.h

 // Copyright 2012 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1010 matching lines @@
                 (HeapObject::cast(this)->map()->instance_type() ==
                  JS_GLOBAL_PROXY_TYPE);
   DCHECK(!result ||
          HeapObject::cast(this)->map()->is_access_check_needed());
   return result;
 }
 
 
 bool Object::IsGlobalObject() const {
   if (!IsHeapObject()) return false;
-
-  InstanceType type = HeapObject::cast(this)->map()->instance_type();
-  return type == JS_GLOBAL_OBJECT_TYPE ||
-         type == JS_BUILTINS_OBJECT_TYPE;
+  return HeapObject::cast(this)->map()->IsGlobalObjectMap();
 }
 
 
 TYPE_CHECKER(JSGlobalObject, JS_GLOBAL_OBJECT_TYPE)
 TYPE_CHECKER(JSBuiltinsObject, JS_BUILTINS_OBJECT_TYPE)
 
 
 bool Object::IsUndetectableObject() const {
   return IsHeapObject()
     && HeapObject::cast(this)->map()->is_undetectable();
@@ skipping 6259 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_