diff -r e27564cd10e3 -r 08a5148e7c4e src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
--- a/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp	Mon Sep 23 14:39:11 2019 -0400
+++ b/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp	Mon Sep 23 14:49:04 2019 -0400
@@ -754,7 +754,7 @@
 }
 
 bool ShenandoahBarrierSetC2::array_copy_requires_gc_barriers(bool tightly_coupled_alloc, BasicType type, bool is_clone, ArrayCopyPhase phase) const {
-  bool is_oop = type == T_OBJECT || type == T_ARRAY;
+  bool is_oop = is_reference_type(type);
   if (!is_oop) {
     return false;
   }
@@ -787,7 +787,7 @@
         }
   } else if (src_type->isa_aryptr()) {
     BasicType src_elem  = src_type->klass()->as_array_klass()->element_type()->basic_type();
-    if (src_elem == T_OBJECT || src_elem == T_ARRAY) {
+    if (is_reference_type(src_elem)) {
       return true;
     }
   } else {