--- old/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-03-22 16:37:36.320885753 +0100
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-03-22 16:37:36.120885760 +0100
@@ -77,6 +77,8 @@
 #include "memory/allocation.hpp"
 #include "memory/iterator.hpp"
 #include "memory/resourceArea.hpp"
+#include "oops/access.inline.hpp"
+#include "oops/compressedOops.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/resolvedMethodTable.hpp"
 #include "runtime/atomic.hpp"
@@ -3810,7 +3812,7 @@
   virtual void do_oop(      oop* p) { do_oop_work(p); }
 
   template <class T> void do_oop_work(T* p) {
-    oop obj = oopDesc::load_decode_heap_oop(p);
+    oop obj = RawAccess<>::oop_load(p);
 
     if (_g1h->is_in_cset_or_humongous(obj)) {
       // If the referent object has been forwarded (either copied
@@ -5215,9 +5217,9 @@
   nmethod* _nm;
 
   template <class T> void do_oop_work(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);
       HeapRegion* hr = _g1h->heap_region_containing(obj);
       assert(!hr->is_continues_humongous(),
              "trying to add code root " PTR_FORMAT " in continuation of humongous region " HR_FORMAT
@@ -5242,9 +5244,9 @@
   nmethod* _nm;
 
   template <class T> void do_oop_work(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);
       HeapRegion* hr = _g1h->heap_region_containing(obj);
       assert(!hr->is_continues_humongous(),
              "trying to remove code root " PTR_FORMAT " in continuation of humongous region " HR_FORMAT