diff -r 55c43e677ded -r fb0275c320a0 src/hotspot/share/runtime/stubRoutines.cpp
--- a/src/hotspot/share/runtime/stubRoutines.cpp	Mon Nov 20 12:04:13 2017 +0100
+++ b/src/hotspot/share/runtime/stubRoutines.cpp	Mon Nov 20 13:07:44 2017 +0100
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "asm/codeBuffer.hpp"
 #include "memory/resourceArea.hpp"
+#include "oops/access.inline.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/timerTrace.hpp"
@@ -377,19 +378,6 @@
 // Default versions of arraycopy functions
 //
 
-static void gen_arraycopy_barrier_pre(oop* dest, size_t count, bool dest_uninitialized) {
-    assert(count != 0, "count should be non-zero");
-    assert(count <= (size_t)max_intx, "count too large");
-    BarrierSet* bs = Universe::heap()->barrier_set();
-    bs->write_ref_array_pre(dest, (int)count, dest_uninitialized);
-}
-
-static void gen_arraycopy_barrier(oop* dest, size_t count) {
-    assert(count != 0, "count should be non-zero");
-    BarrierSet* bs = Universe::heap()->barrier_set();
-    bs->write_ref_array((HeapWord*)dest, count);
-}
-
 JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))
 #ifndef PRODUCT
   SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy
@@ -423,9 +411,7 @@
   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 #endif // !PRODUCT
   assert(count != 0, "count should be non-zero");
-  gen_arraycopy_barrier_pre(dest, count, /*dest_uninitialized*/false);
-  Copy::conjoint_oops_atomic(src, dest, count);
-  gen_arraycopy_barrier(dest, count);
+  HeapAccess<>::oop_arraycopy(NULL, NULL, (HeapWord*)src, (HeapWord*)dest, count);
 JRT_END
 
 JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))
@@ -433,9 +419,7 @@
   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 #endif // !PRODUCT
   assert(count != 0, "count should be non-zero");
-  gen_arraycopy_barrier_pre(dest, count, /*dest_uninitialized*/true);
-  Copy::conjoint_oops_atomic(src, dest, count);
-  gen_arraycopy_barrier(dest, count);
+  HeapAccess<ARRAYCOPY_DEST_NOT_INITIALIZED>::oop_arraycopy(NULL, NULL, (HeapWord*)src, (HeapWord*)dest, count);
 JRT_END
 
 JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))
@@ -471,9 +455,7 @@
   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 #endif // !PRODUCT
   assert(count != 0, "count should be non-zero");
-  gen_arraycopy_barrier_pre((oop *) dest, count, /*dest_uninitialized*/false);
-  Copy::arrayof_conjoint_oops(src, dest, count);
-  gen_arraycopy_barrier((oop *) dest, count);
+  HeapAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy(NULL, NULL, src, dest, count);
 JRT_END
 
 JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))
@@ -481,9 +463,7 @@
   SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy
 #endif // !PRODUCT
   assert(count != 0, "count should be non-zero");
-  gen_arraycopy_barrier_pre((oop *) dest, count, /*dest_uninitialized*/true);
-  Copy::arrayof_conjoint_oops(src, dest, count);
-  gen_arraycopy_barrier((oop *) dest, count);
+  HeapAccess<ARRAYCOPY_ARRAYOF | ARRAYCOPY_DEST_NOT_INITIALIZED>::oop_arraycopy(NULL, NULL, src, dest, count);
 JRT_END
 
 address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {