diff -r 55fac6146d31 -r 7e8c0409a747 src/hotspot/share/oops/typeArrayKlass.cpp
--- a/src/hotspot/share/oops/typeArrayKlass.cpp	Mon Jun 04 22:03:10 2018 +0200
+++ b/src/hotspot/share/oops/typeArrayKlass.cpp	Mon Jun 04 23:01:48 2018 +0200
@@ -175,10 +175,9 @@
 
   // This is an attempt to make the copy_array fast.
   int l2es = log2_element_size();
-  int ihs = array_header_in_bytes() / wordSize;
-  void* src = (char*) (s->base(element_type())) + ((size_t)src_pos << l2es);
-  void* dst = (char*) (d->base(element_type())) + ((size_t)dst_pos << l2es);
-  HeapAccess<ARRAYCOPY_ATOMIC>::arraycopy(s, d, src, dst, (size_t)length << l2es);
+  size_t src_offset = arrayOopDesc::base_offset_in_bytes(element_type()) + ((size_t)src_pos << l2es);
+  size_t dst_offset = arrayOopDesc::base_offset_in_bytes(element_type()) + ((size_t)dst_pos << l2es);
+  ArrayAccess<ARRAYCOPY_ATOMIC>::arraycopy<void>(s, src_offset, d, dst_offset, (size_t)length << l2es);
 }
 
 // create a klass of array holding typeArrays