src/hotspot/cpu/x86/x86.ad

@@ -2795,15 +2795,11 @@
   match(OnSpinWait);
   ins_cost(200);
 
   format %{
     $$template
-    if (os::is_MP()) {
       $$emit$$"pause\t! membar_onspinwait"
-    } else {
-      $$emit$$"MEMBAR-onspinwait ! (empty encoding)"
-    }
   %}
   ins_encode %{
     __ pause();
   %}
   ins_pipe(pipe_slow);