--- a/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotBackend.java	Mon Aug 28 16:40:01 2017 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/HotSpotBackend.java	Mon Aug 28 14:43:32 2017 -0700
@@ -64,9 +64,9 @@
 import org.graalvm.compiler.options.OptionValues;
 import org.graalvm.compiler.phases.tiers.SuitesProvider;
 import org.graalvm.compiler.word.Word;
-import org.graalvm.util.Equivalence;
 import org.graalvm.util.EconomicMap;
 import org.graalvm.util.EconomicSet;
+import org.graalvm.util.Equivalence;
 import org.graalvm.util.MapCursor;
 import org.graalvm.word.Pointer;
 
@@ -258,6 +258,18 @@
     private static native void sha5ImplCompressStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word bufAddr, Object state);
 
     /**
+     * @see org.graalvm.compiler.hotspot.meta.HotSpotUnsafeSubstitutions#copyMemory
+     */
+    public static final ForeignCallDescriptor UNSAFE_ARRAYCOPY = new ForeignCallDescriptor("unsafe_arraycopy", void.class, Word.class, Word.class, Word.class);
+
+    public static void unsafeArraycopy(Word srcAddr, Word dstAddr, Word size) {
+        unsafeArraycopyStub(HotSpotBackend.UNSAFE_ARRAYCOPY, srcAddr, dstAddr, size);
+    }
+
+    @NodeIntrinsic(ForeignCallNode.class)
+    private static native void unsafeArraycopyStub(@ConstantNodeParameter ForeignCallDescriptor descriptor, Word srcAddr, Word dstAddr, Word size);
+
+    /**
      * @see VMErrorNode
      */
     public static final ForeignCallDescriptor VM_ERROR = new ForeignCallDescriptor("vm_error", void.class, Object.class, Object.class, long.class);