src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/ComputeObjectAddressNode.java

@@ -28,10 +28,11 @@
 
 import org.graalvm.compiler.core.common.type.StampFactory;
 import org.graalvm.compiler.graph.NodeClass;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
 import org.graalvm.compiler.nodeinfo.NodeSize;
+import org.graalvm.compiler.nodes.calc.SignExtendNode;
 import org.graalvm.compiler.nodes.debug.ControlFlowAnchored;
 import org.graalvm.compiler.nodes.spi.Lowerable;
 import org.graalvm.compiler.nodes.spi.LoweringTool;
 
 import jdk.vm.ci.meta.JavaKind;

@@ -48,11 +49,11 @@
     @Input ValueNode offset;
 
     public ComputeObjectAddressNode(ValueNode obj, ValueNode offset) {
         super(TYPE, StampFactory.forKind(JavaKind.Long));
         this.object = obj;
-        this.offset = offset;
+        this.offset = SignExtendNode.create(offset, 64, NodeView.DEFAULT);
     }
 
     @NodeIntrinsic
     public static native long get(Object array, long offset);