diff -r ea43db53de91 -r ed12027517c0 src/hotspot/share/adlc/formssel.cpp
--- a/src/hotspot/share/adlc/formssel.cpp	Mon Jun 10 05:09:52 2019 +0200
+++ b/src/hotspot/share/adlc/formssel.cpp	Thu Feb 14 14:54:05 2019 +0100
@@ -757,7 +757,6 @@
   return NO_MEMORY_OPERAND;
 }
 
-
 // This instruction captures the machine-independent bottom_type
 // Expected use is for pointer vs oop determination for LoadP
 bool InstructForm::captures_bottom_type(FormDict &globals) const {
@@ -775,8 +774,9 @@
        !strcmp(_matrule->_rChild->_opType,"GetAndSetP")   ||
        !strcmp(_matrule->_rChild->_opType,"GetAndSetN")   ||
 #if INCLUDE_ZGC
+       !strcmp(_matrule->_rChild->_opType,"ZGetAndSetP") ||
+       !strcmp(_matrule->_rChild->_opType,"ZCompareAndExchangeP") ||
        !strcmp(_matrule->_rChild->_opType,"LoadBarrierSlowReg") ||
-       !strcmp(_matrule->_rChild->_opType,"LoadBarrierWeakSlowReg") ||
 #endif
 #if INCLUDE_SHENANDOAHGC
        !strcmp(_matrule->_rChild->_opType,"ShenandoahCompareAndExchangeP") ||
@@ -3506,12 +3506,16 @@
     "CompareAndSwapB", "CompareAndSwapS", "CompareAndSwapI", "CompareAndSwapL", "CompareAndSwapP", "CompareAndSwapN",
     "WeakCompareAndSwapB", "WeakCompareAndSwapS", "WeakCompareAndSwapI", "WeakCompareAndSwapL", "WeakCompareAndSwapP", "WeakCompareAndSwapN",
     "CompareAndExchangeB", "CompareAndExchangeS", "CompareAndExchangeI", "CompareAndExchangeL", "CompareAndExchangeP", "CompareAndExchangeN",
+#if INCLUDE_SHENANDOAHGC
     "ShenandoahCompareAndSwapN", "ShenandoahCompareAndSwapP", "ShenandoahWeakCompareAndSwapP", "ShenandoahWeakCompareAndSwapN", "ShenandoahCompareAndExchangeP", "ShenandoahCompareAndExchangeN",
+#endif
     "StoreCM",
-    "ClearArray",
     "GetAndSetB", "GetAndSetS", "GetAndAddI", "GetAndSetI", "GetAndSetP",
     "GetAndAddB", "GetAndAddS", "GetAndAddL", "GetAndSetL", "GetAndSetN",
-    "LoadBarrierSlowReg", "LoadBarrierWeakSlowReg"
+#if INCLUDE_ZGC
+    "LoadBarrierSlowReg", "ZGetAndSetP", "ZCompareAndSwapP", "ZCompareAndExchangeP", "ZWeakCompareAndSwapP",
+#endif
+    "ClearArray"
   };
   int cnt = sizeof(needs_ideal_memory_list)/sizeof(char*);
   if( strcmp(_opType,"PrefetchAllocation")==0 )