diff -r 86dbf3cacacc -r 4d9030fe341f hotspot/src/share/vm/c1/c1_FrameMap.cpp
--- a/hotspot/src/share/vm/c1/c1_FrameMap.cpp	Wed Jul 28 17:57:43 2010 -0400
+++ b/hotspot/src/share/vm/c1/c1_FrameMap.cpp	Tue Aug 03 08:13:38 2010 -0400
@@ -90,7 +90,7 @@
 
   if (outgoing) {
     // update the space reserved for arguments.
-    update_reserved_argument_area_size(out_preserve);
+    update_reserved_argument_area_size(out_preserve * BytesPerWord);
   }
   return new CallingConvention(args, out_preserve);
 }
@@ -138,7 +138,7 @@
   }
   assert(args->length() == signature->length(), "size mismatch");
   out_preserve += SharedRuntime::out_preserve_stack_slots();
-  update_reserved_argument_area_size(out_preserve);
+  update_reserved_argument_area_size(out_preserve * BytesPerWord);
   return new CallingConvention(args, out_preserve);
 }