Try to make the contextuality check in the IC code faster...

bleeding_edge/src/ic.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 86 matching lines @@
   // Clear the inline cache to initial state.
   static void Clear(Address address);
 
   // Computes the reloc info for this IC. This is a fairly expensive
   // operation as it has to search through the heap to find the code
   // object that contains this IC site.
   RelocInfo::Mode ComputeMode();
 
   // Returns if this IC is for contextual (no explicit receiver)
   // access to properties.
-  bool is_contextual() {
+  bool IsContextual(Handle<Object> receiver) {
+    if (receiver->IsGlobalObject()) {
+      return SlowIsContextual();
+    } else {
+      ASSERT(!SlowIsContextual());
+      return false;
+    }
+  }
+
+  bool SlowIsContextual() {
     return ComputeMode() == RelocInfo::CODE_TARGET_CONTEXT;
   }
 
   // Returns the map to use for caching stubs for a given object.
   // This method should not be called with undefined or null.
   static inline Map* GetCodeCacheMapForObject(Object* object);
 
  protected:
   Address fp() const { return fp_; }
   Address pc() const { return *pc_address_; }
@@ skipping 298 matching lines @@
   // The map is the new map that the inlined code should check against.
   static bool PatchInlinedStore(Address address, Object* map);
 
   friend class IC;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_