Use -O9, tune for nocoma, assume at least a Pentium when generating code.

src/objects.cc

 // Copyright 2006-2008 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 1673 matching lines @@
   }
   return holder_handle->GetPropertyAttributePostInterceptor(*receiver_handle,
                                                             *name_handle,
                                                             continue_search);
 }
 
 
 PropertyAttributes JSObject::GetPropertyAttributeWithReceiver(
       JSObject* receiver,
       String* key) {
-  uint32_t index;
+  uint32_t index = 0;

[bak, 2008/09/26 12:21:59]

Please add a comment why this assignment is necessary.

   if (key->AsArrayIndex(&index)) {
     if (HasElementWithReceiver(receiver, index)) return NONE;
     return ABSENT;
   }
   // Named property.
   LookupResult result;
   Lookup(key, &result);
   return GetPropertyAttribute(receiver, &result, key, true);
 }
 
@@ skipping 26 matching lines @@
         UNREACHABLE();
         break;
     }
   }
   return ABSENT;
 }
 
 
 PropertyAttributes JSObject::GetLocalPropertyAttribute(String* name) {
   // Check whether the name is an array index.
-  uint32_t index;
+  uint32_t index = 0;

[bak, 2008/09/26 12:21:59]

Please move the assignment into AsArrayIndex in objects-inl.h.

   if (name->AsArrayIndex(&index)) {
     if (HasLocalElement(index)) return NONE;
     return ABSENT;
   }
   // Named property.
   LookupResult result;
   LocalLookup(name, &result);
   return GetPropertyAttribute(this, &result, name, false);
 }
 
@@ skipping 251 matching lines @@
   // Check access rights if needed.
   if (IsAccessCheckNeeded() &&
       !Top::MayNamedAccess(this, name, v8::ACCESS_DELETE)) {
     Top::ReportFailedAccessCheck(this, v8::ACCESS_DELETE);
     return Heap::false_value();
   }
 
   // ECMA-262, 3rd, 8.6.2.5
   ASSERT(name->IsString());
 
-  uint32_t index;
+  uint32_t index = 0;
   if (name->AsArrayIndex(&index)) {
     return DeleteElement(index);
   } else {
     LookupResult result;
     LocalLookup(name, &result);
     if (!result.IsValid()) return Heap::true_value();
     if (result.IsDontDelete()) return Heap::false_value();
     // Check for interceptor.
     if (result.type() == INTERCEPTOR) {
       return DeletePropertyWithInterceptor(name);
@@ skipping 4360 matching lines @@
   // No break point.
   if (break_point_objects()->IsUndefined()) return 0;
   // Single beak point.
   if (!break_point_objects()->IsFixedArray()) return 1;
   // Multiple break points.
   return FixedArray::cast(break_point_objects())->length();
 }
 
 
 } }  // namespace v8::internal