--- old/src/cpu/x86/vm/x86_32.ad	2011-07-22 11:55:10.572377938 +0200
+++ new/src/cpu/x86/vm/x86_32.ad	2011-07-22 11:55:10.334618251 +0200
@@ -7806,8 +7806,7 @@
 %}
 
 instruct membar_acquire_lock() %{
-  match(MemBarAcquire);
-  predicate(Matcher::prior_fast_lock(n));
+  match(MemBarAcquireLock);
   ins_cost(0);
 
   size(0);
@@ -7827,8 +7826,7 @@
 %}
 
 instruct membar_release_lock() %{
-  match(MemBarRelease);
-  predicate(Matcher::post_fast_unlock(n));
+  match(MemBarReleaseLock);
   ins_cost(0);
 
   size(0);