--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/UnsignedMath.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2011, 2011, 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 com.oracle.jvmci.code;
+
+import java.math.*;
+
+//JaCoCo Exclude
+
+/**
+ * Utilities for unsigned comparisons. All methods have correct, but slow, standard Java
+ * implementations so that they can be used with compilers not supporting the intrinsics.
+ */
+public class UnsignedMath {
+
+    private static final long MASK = 0xffffffffL;
+
+    /**
+     * Unsigned comparison aboveThan for two numbers.
+     */
+    public static boolean aboveThan(int a, int b) {
+        return (a & MASK) > (b & MASK);
+    }
+
+    /**
+     * Unsigned comparison aboveOrEqual for two numbers.
+     */
+    public static boolean aboveOrEqual(int a, int b) {
+        return (a & MASK) >= (b & MASK);
+    }
+
+    /**
+     * Unsigned comparison belowThan for two numbers.
+     */
+    public static boolean belowThan(int a, int b) {
+        return (a & MASK) < (b & MASK);
+    }
+
+    /**
+     * Unsigned comparison belowOrEqual for two numbers.
+     */
+    public static boolean belowOrEqual(int a, int b) {
+        return (a & MASK) <= (b & MASK);
+    }
+
+    /**
+     * Unsigned comparison aboveThan for two numbers.
+     */
+    public static boolean aboveThan(long a, long b) {
+        return (a > b) ^ ((a < 0) != (b < 0));
+    }
+
+    /**
+     * Unsigned comparison aboveOrEqual for two numbers.
+     */
+    public static boolean aboveOrEqual(long a, long b) {
+        return (a >= b) ^ ((a < 0) != (b < 0));
+    }
+
+    /**
+     * Unsigned comparison belowThan for two numbers.
+     */
+    public static boolean belowThan(long a, long b) {
+        return (a < b) ^ ((a < 0) != (b < 0));
+    }
+
+    /**
+     * Unsigned comparison belowOrEqual for two numbers.
+     */
+    public static boolean belowOrEqual(long a, long b) {
+        return (a <= b) ^ ((a < 0) != (b < 0));
+    }
+
+    /**
+     * Unsigned division for two numbers.
+     */
+    public static int divide(int a, int b) {
+        return (int) ((a & MASK) / (b & MASK));
+    }
+
+    /**
+     * Unsigned remainder for two numbers.
+     */
+    public static int remainder(int a, int b) {
+        return (int) ((a & MASK) % (b & MASK));
+    }
+
+    /**
+     * Unsigned division for two numbers.
+     */
+    public static long divide(long a, long b) {
+        return bi(a).divide(bi(b)).longValue();
+    }
+
+    /**
+     * Unsigned remainder for two numbers.
+     */
+    public static long remainder(long a, long b) {
+        return bi(a).remainder(bi(b)).longValue();
+    }
+
+    private static BigInteger bi(long unsigned) {
+        return unsigned >= 0 ? BigInteger.valueOf(unsigned) : BigInteger.valueOf(unsigned & 0x7fffffffffffffffL).setBit(63);
+    }
+}