--- old/src/hotspot/share/c1/c1_Runtime1.cpp	2018-03-08 13:22:56.946563378 +0100
+++ new/src/hotspot/share/c1/c1_Runtime1.cpp	2018-03-08 13:22:56.762565691 +0100
@@ -1402,13 +1402,8 @@
     Klass* klass_oop = src->klass();
     if (klass_oop != dst->klass()) return ac_failed;
     TypeArrayKlass* klass = TypeArrayKlass::cast(klass_oop);
-    const int l2es = klass->log2_element_size();
-    const int ihs = klass->array_header_in_bytes() / wordSize;
-    char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es);
-    char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es);
-    // Potential problem: memmove is not guaranteed to be word atomic
-    // Revisit in Merlin
-    return HeapAccess<>::arraycopy(arrayOop(src), arrayOop(dst), src_addr, dst_addr, length << l2es) ? ac_ok : ac_failed;
+    klass->copy_array(arrayOop(src), src_pos, arrayOop(dst), dst_pos, length, Thread::current());
+    return ac_ok;
   } else if (src->is_objArray() && dst->is_objArray()) {
     if (UseCompressedOops) {
       narrowOop *src_addr  = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos);