src/share/vm/opto/macro.cpp

*** 1683,1695 ****
                           OptoRuntime::new_instance_Java());
  }
  
  void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
    Node* length = alloc->in(AllocateNode::ALength);
    expand_allocate_common(alloc, length,
                           OptoRuntime::new_array_Type(),
!                          OptoRuntime::new_array_Java());
  }
  
  //-----------------------mark_eliminated_locking_nodes-----------------------
  // During EA obj may point to several objects but after few ideal graph
  // transformations (CCP) it may point to only one non escaping object
--- 1683,1707 ----
                           OptoRuntime::new_instance_Java());
  }
  
  void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
    Node* length = alloc->in(AllocateNode::ALength);
+   InitializeNode* init = alloc->initialization();
+   Node* klass_node = alloc->in(AllocateNode::KlassNode);
+   ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
+   address slow_call_address;  // Address of slow call
+   if (init != NULL && init->is_complete_with_arraycopy() &&
+       k->is_type_array_klass()) {
+     // Don't zero type array during slow allocation in VM since
+     // it will be initialized later by arraycopy in compiled code.
+     slow_call_address = OptoRuntime::new_array_nozero_Java();
+   } else {
+     slow_call_address = OptoRuntime::new_array_Java();
+   }
    expand_allocate_common(alloc, length,
                           OptoRuntime::new_array_Type(),
!                          slow_call_address);
  }
  
  //-----------------------mark_eliminated_locking_nodes-----------------------
  // During EA obj may point to several objects but after few ideal graph
  // transformations (CCP) it may point to only one non escaping object