--- old/src/hotspot/cpu/aarch64/aarch64.ad	2018-08-20 11:53:22.166380268 +0100
+++ new/src/hotspot/cpu/aarch64/aarch64.ad	2018-08-20 11:53:21.867379377 +0100
@@ -8925,6 +8925,44 @@
 
 //  ---------------- end of volatile loads and stores ----------------
 
+instruct cacheWB(indirect addr)
+%{
+  match(CacheWB addr);
+
+  ins_cost(100);
+  format %{"cache wb $addr" %}
+  ins_encode %{
+    assert($addr->index_position() < 0, "should be");
+    assert($addr$$disp == 0, "should be");
+    __ cache_wb(Address($addr$$base$$Register, 0));
+  %}
+  ins_pipe(pipe_slow); // XXX
+%}
+
+instruct cacheWBPreSync()
+%{
+  match(CacheWBPreSync);
+
+  ins_cost(100);
+  format %{"cache wb presync" %}
+  ins_encode %{
+    __ cache_wbsync(true);
+  %}
+  ins_pipe(pipe_slow); // XXX
+%}
+
+instruct cacheWBPostSync()
+%{
+  match(CacheWBPostSync);
+
+  ins_cost(100);
+  format %{"cache wb postsync" %}
+  ins_encode %{
+    __ cache_wbsync(false);
+  %}
+  ins_pipe(pipe_slow); // XXX
+%}
+
 // ============================================================================
 // BSWAP Instructions