diff -r dde53abda3d6 -r 720b6a76dd9d src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp	Wed Apr 11 16:18:45 2012 +0200
+++ b/src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp	Wed Apr 18 07:21:15 2012 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,11 +28,11 @@
 #include "gc_implementation/g1/heapRegion.hpp"
 #include "gc_implementation/g1/heapRegionSeq.hpp"
 
-inline size_t HeapRegionSeq::addr_to_index_biased(HeapWord* addr) const {
+inline uintx HeapRegionSeq::addr_to_index_biased(HeapWord* addr) const {
   assert(_heap_bottom <= addr && addr < _heap_end,
          err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                  addr, _heap_bottom, _heap_end));
-  size_t index = (size_t) addr >> _region_shift;
+  uintx index = (uintx) addr >> _region_shift;
   return index;
 }
 
@@ -40,7 +40,7 @@
   assert(_heap_bottom <= addr && addr < _heap_end,
          err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                  addr, _heap_bottom, _heap_end));
-  size_t index_biased = addr_to_index_biased(addr);
+  uintx index_biased = addr_to_index_biased(addr);
   HeapRegion* hr = _regions_biased[index_biased];
   assert(hr != NULL, "invariant");
   return hr;
@@ -55,7 +55,7 @@
   return NULL;
 }
 
-inline HeapRegion* HeapRegionSeq::at(size_t index) const {
+inline HeapRegion* HeapRegionSeq::at(uint index) const {
   assert(index < length(), "pre-condition");
   HeapRegion* hr = _regions[index];
   assert(hr != NULL, "sanity");