--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/objects/instancevariables/ReadFixnumInstanceVariableNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.nodes.objects.instancevariables;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+@NodeInfo(shortName = "@Fixnum")
+public class ReadFixnumInstanceVariableNode extends ReadSpecializedInstanceVariableNode {
+
+    private final FixnumStorageLocation storageLocation;
+
+    public ReadFixnumInstanceVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode receiver, ObjectLayout objectLayout, FixnumStorageLocation storageLocation) {
+        super(context, sourceSection, name, receiver, objectLayout);
+        this.storageLocation = storageLocation;
+    }
+
+    @Override
+    public int executeFixnum(VirtualFrame frame) throws UnexpectedResultException {
+        final RubyBasicObject receiverObject = (RubyBasicObject) receiver.execute(frame);
+
+        final ObjectLayout receiverLayout = receiverObject.getObjectLayout();
+
+        final boolean condition = receiverLayout == objectLayout;
+
+        if (condition) {
+            assert receiverLayout != null;
+            return storageLocation.readFixnum(receiverObject, condition);
+        } else {
+            CompilerDirectives.transferToInterpreter();
+            replace(respecialize(receiverObject));
+            throw new UnexpectedResultException(receiverObject.getInstanceVariable(name));
+        }
+    }
+
+    @Override
+    public Object execute(VirtualFrame frame) {
+        try {
+            return executeFixnum(frame);
+        } catch (UnexpectedResultException e) {
+            return e.getResult();
+        }
+    }
+
+}