--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/CompressEncoding.java	2016-12-09 00:49:14.232648177 -0800
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.hotspot;
+
+/**
+ * A compact representation of the different encoding strategies for Objects and metadata.
+ */
+public class CompressEncoding {
+    public final long base;
+    public final int shift;
+    public final int alignment;
+
+    CompressEncoding(long base, int shift, int alignment) {
+        this.base = base;
+        this.shift = shift;
+        this.alignment = alignment;
+    }
+
+    public int compress(long ptr) {
+        if (ptr == 0L) {
+            return 0;
+        } else {
+            return (int) ((ptr - base) >>> shift);
+        }
+    }
+
+    public long uncompress(int ptr) {
+        if (ptr == 0) {
+            return 0L;
+        } else {
+            return ((ptr & 0xFFFFFFFFL) << shift) + base;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "base: " + base + " shift: " + shift + " alignment: " + alignment;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + alignment;
+        result = prime * result + (int) (base ^ (base >>> 32));
+        result = prime * result + shift;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj instanceof CompressEncoding) {
+            CompressEncoding other = (CompressEncoding) obj;
+            return alignment == other.alignment && base == other.base && shift == other.shift;
+        } else {
+            return false;
+        }
+    }
+}