--- old/src/hotspot/share/gc/parallel/psCompactionManager.inline.hpp	2018-03-21 16:41:05.995888111 +0100
+++ new/src/hotspot/share/gc/parallel/psCompactionManager.inline.hpp	2018-03-21 16:41:05.791888119 +0100
@@ -29,7 +29,9 @@
 #include "gc/parallel/psCompactionManager.hpp"
 #include "gc/parallel/psParallelCompact.inline.hpp"
 #include "gc/shared/taskqueue.inline.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/arrayOop.inline.hpp"
+#include "oops/compressedOops.inline.hpp"
 #include "oops/objArrayOop.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "utilities/debug.hpp"
@@ -71,9 +73,9 @@
 
 template <typename T>
 inline void ParCompactionManager::mark_and_push(T* p) {
-  T heap_oop = oopDesc::load_heap_oop(p);
-  if (!oopDesc::is_null(heap_oop)) {
-    oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
+  T heap_oop = RawAccess<>::oop_load(p);
+  if (!CompressedOops::is_null(heap_oop)) {
+    oop obj = CompressedOops::decode_not_null(heap_oop);
     assert(ParallelScavengeHeap::heap()->is_in(obj), "should be in heap");
 
     if (mark_bitmap()->is_unmarked(obj) && PSParallelCompact::mark_obj(obj)) {