HStoreNamedField for Smis optimized for x64

src/objects-inl.h

 // Copyright 2012 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 249 matching lines @@
 }
 
 bool Object::HasValidElements() {
   // Dictionary is covered under FixedArray.
   return IsFixedArray() || IsFixedDoubleArray() || IsExternalArray();
 }
 
 
 MaybeObject* Object::AllocateNewStorageFor(Heap* heap,
                                            Representation representation) {
+  if (FLAG_track_fields && representation.IsSmi() && IsUninitialized()) {
+    return Smi::FromInt(0);
+  }
   if (!FLAG_track_double_fields) return this;
   if (!representation.IsDouble()) return this;
   if (IsUninitialized()) {
     return heap->AllocateHeapNumber(0);
   }
   return heap->AllocateHeapNumber(Number());
 }
 
 
 StringShape::StringShape(String* str)
@@ skipping 6183 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_