src/hotspot/share/opto/subnode.cpp

*** 1066,1075 ****
--- 1066,1084 ----
  
    // Verify that we understand the situation
    if (con2 != (intptr_t) superklass->super_check_offset())
      return NULL;                // Might be element-klass loading from array klass
  
+   // Do not normalize comparisons between Java mirror loads from [V? to klass comparisons. The runtime type
+   // might be [V due to [V <: [V? and the klass for [V? and [V is the same but the component mirror is not.
+   if (superklass->is_obj_array_klass()) {
+     ciObjArrayKlass* ak = superklass->as_obj_array_klass();
+     if (!ak->storage_properties().is_null_free() && ak->element_klass()->is_valuetype()) {
+       return NULL;
+     }
+   }
+ 
    // If 'superklass' has no subklasses and is not an interface, then we are
    // assured that the only input which will pass the type check is
    // 'superklass' itself.
    //
    // We could be more liberal here, and allow the optimization on interfaces