--- old/src/hotspot/share/oops/oop.inline.hpp	2017-10-13 11:46:10.021868496 -0400
+++ new/src/hotspot/share/oops/oop.inline.hpp	2017-10-13 11:46:09.553734406 -0400
@@ -388,7 +388,7 @@
   if (UseCompressedOops) {
     // encode exchange value from oop to T
     narrowOop val = encode_heap_oop(exchange_value);
-    narrowOop old = (narrowOop)Atomic::xchg(val, (narrowOop*)dest);
+    narrowOop old = Atomic::xchg(val, (narrowOop*)dest);
     // decode old from T to oop
     return decode_heap_oop(old);
   } else {