--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ObjectCloneSnippets.java	Mon Dec 15 12:56:22 2014 -0800
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/ObjectCloneSnippets.java	Mon Dec 15 13:10:44 2014 -0800
@@ -114,7 +114,7 @@
 
     @Snippet(removeAllFrameStates = true)
     public static Object[] objectArrayClone(Object[] src) {
-        Object[] result = (Object[]) DynamicNewArrayNode.newUninitializedArray(GuardingPiNode.guardingNonNull(src.getClass().getComponentType()), src.length);
+        Object[] result = (Object[]) DynamicNewArrayNode.newUninitializedArray(GuardingPiNode.guardingNonNull(src.getClass().getComponentType()), src.length, Kind.Object);
         ArrayCopyCallNode.disjointUninitializedArraycopy(src, 0, result, 0, src.length, Kind.Object);
         return result;
     }

--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/DynamicNewArrayNode.java	Mon Dec 15 12:56:22 2014 -0800
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/DynamicNewArrayNode.java	Mon Dec 15 13:10:44 2014 -0800
@@ -42,27 +42,38 @@
 
     @Input ValueNode elementType;
 
+    /**
+     * A non-null value indicating the worst case element type. Mainly useful for distinguishing
+     * Object arrays from primitive arrays.
+     */
+    protected final Kind knownElementKind;
+
     public static DynamicNewArrayNode create(ValueNode elementType, ValueNode length) {
         return new DynamicNewArrayNode(elementType, length);
     }
 
     protected DynamicNewArrayNode(ValueNode elementType, ValueNode length) {
-        this(elementType, length, true);
+        this(elementType, length, true, null);
     }
 
-    public static DynamicNewArrayNode create(ValueNode elementType, ValueNode length, boolean fillContents) {
-        return new DynamicNewArrayNode(elementType, length, fillContents);
+    public static DynamicNewArrayNode create(ValueNode elementType, ValueNode length, boolean fillContents, Kind knownElementKind) {
+        return new DynamicNewArrayNode(elementType, length, fillContents, knownElementKind);
     }
 
-    protected DynamicNewArrayNode(ValueNode elementType, ValueNode length, boolean fillContents) {
+    protected DynamicNewArrayNode(ValueNode elementType, ValueNode length, boolean fillContents, Kind knownElementKind) {
         super(StampFactory.objectNonNull(), length, fillContents);
         this.elementType = elementType;
+        this.knownElementKind = knownElementKind;
     }
 
     public ValueNode getElementType() {
         return elementType;
     }
 
+    public Kind getKnownElementKind() {
+        return knownElementKind;
+    }
+
     protected NewArrayNode forConstantType(ResolvedJavaType type) {
         ValueNode len = length();
         NewArrayNode ret = graph().add(NewArrayNode.create(type, len.isAlive() ? len : graph().addOrUniqueWithInputs(len), fillContents()));
@@ -94,10 +105,10 @@
     }
 
     @NodeIntrinsic
-    private static native Object newArray(Class<?> componentType, int length, @ConstantNodeParameter boolean fillContents);
+    private static native Object newArray(Class<?> componentType, int length, @ConstantNodeParameter boolean fillContents, @ConstantNodeParameter Kind knownElementKind);
 
-    public static Object newUninitializedArray(Class<?> componentType, int length) {
-        return newArray(componentType, length, false);
+    public static Object newUninitializedArray(Class<?> componentType, int length, Kind knownElementKind) {
+        return newArray(componentType, length, false, knownElementKind);
     }
 
 }