diff -r 23e3ab980622 -r 9b7b9f16dfd9 src/hotspot/share/adlc/formssel.cpp
--- a/src/hotspot/share/adlc/formssel.cpp	Tue Aug 20 10:46:23 2019 +0200
+++ b/src/hotspot/share/adlc/formssel.cpp	Tue Aug 20 10:11:53 2019 +0100
@@ -3518,6 +3518,12 @@
   int cnt = sizeof(needs_ideal_memory_list)/sizeof(char*);
   if( strcmp(_opType,"PrefetchAllocation")==0 )
     return 1;
+  if( strcmp(_opType,"CacheWB")==0 )
+    return 1;
+  if( strcmp(_opType,"CacheWBPreSync")==0 )
+    return 1;
+  if( strcmp(_opType,"CacheWBPostSync")==0 )
+    return 1;
   if( _lChild ) {
     const char *opType = _lChild->_opType;
     for( int i=0; i<cnt; i++ )