diff -r 389049f3f393 -r 323bd24c6520 src/share/vm/c1/c1_GraphBuilder.cpp
--- a/src/share/vm/c1/c1_GraphBuilder.cpp	Fri Oct 30 16:22:59 2009 -0700
+++ b/src/share/vm/c1/c1_GraphBuilder.cpp	Mon Nov 02 11:17:55 2009 +0100
@@ -365,7 +365,7 @@
     if (_next_loop_index < 31) _next_loop_index++;
   } else {
     // block already marked as loop header
-    assert(is_power_of_2(_loop_map.at(block->block_id())), "exactly one bit must be set");
+    assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
   }
 }