One less dependent load in InvokeBuiltin.

src/objects.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3507 matching lines @@
 
 
 // Builtins global object which holds the runtime routines written in
 // JavaScript.
 class JSBuiltinsObject: public GlobalObject {
  public:
   // Accessors for the runtime routines written in JavaScript.
   inline Object* javascript_builtin(Builtins::JavaScript id);
   inline void set_javascript_builtin(Builtins::JavaScript id, Object* value);
 
+  // Accessors for code of the runtime routines written in JavaScript.
+  inline Code* javascript_builtin_code(Builtins::JavaScript id);
+  inline void set_javascript_builtin_code(Builtins::JavaScript id, Code* value);
+
   // Casting.
   static inline JSBuiltinsObject* cast(Object* obj);
 
   // Dispatched behavior.
 #ifdef DEBUG
   void JSBuiltinsObjectPrint();
   void JSBuiltinsObjectVerify();
 #endif
 
   // Layout description.  The size of the builtins object includes
-  // room for one pointer per runtime routine written in javascript.
+  // room for two pointers per runtime routine written in javascript
+  // (function and code object).
   static const int kJSBuiltinsCount = Builtins::id_count;
   static const int kJSBuiltinsOffset = GlobalObject::kHeaderSize;
+  static const int kJSBuiltinsCodeOffset =
+      GlobalObject::kHeaderSize + (kJSBuiltinsCount * kPointerSize);
   static const int kSize =
-      kJSBuiltinsOffset + (kJSBuiltinsCount * kPointerSize);
+      kJSBuiltinsCodeOffset + (kJSBuiltinsCount * kPointerSize);
+
+  static int OffsetOfFunctionWithId(Builtins::JavaScript id) {
+    return kJSBuiltinsOffset + id * kPointerSize;
+  }
+
+  static int OffsetOfCodeWithId(Builtins::JavaScript id) {
+    return kJSBuiltinsCodeOffset + id * kPointerSize;
+  }
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSBuiltinsObject);
 };
 
 
 // Representation for JS Wrapper objects, String, Number, Boolean, Date, etc.
 class JSValue: public JSObject {
  public:
   // [value]: the object being wrapped.
   DECL_ACCESSORS(value, Object)
@@ skipping 1528 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_