*** old/src/share/vm/runtime/arguments.cpp	Tue Sep 14 14:10:23 2010
--- new/src/share/vm/runtime/arguments.cpp	Tue Sep 14 14:10:23 2010

*** 1271,1281 ****
--- 1271,1282 ----
    }
    return true;
  }
  
  inline uintx max_heap_for_compressed_oops() {
    LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
+   // Heap should be above HeapBaseMinAddress to get zero based compressed oops.
+   LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size() - HeapBaseMinAddress);
    NOT_LP64(ShouldNotReachHere(); return 0);
  }
  
  bool Arguments::should_auto_select_low_pause_collector() {
    if (UseAutoGCSelectPolicy &&