--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.asm/src/com/oracle/max/asm/NumUtil.java	Sat Dec 17 19:59:18 2011 +0100
@@ -0,0 +1,101 @@
+/*
+ * 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.max.asm;
+
+/**
+ * A collection of static utility functions that check ranges of numbers.
+ */
+public class NumUtil {
+    public static boolean isShiftCount(int x) {
+        return 0 <= x && x < 32;
+    }
+
+    /**
+     * Determines if a given {@code int} value is the range of unsigned byte
+     * values.
+     */
+    public static boolean isUByte(int x) {
+        return (x & 0xff) == x;
+    }
+
+    /**
+     * Determines if a given {@code int} value is the range of signed byte
+     * values.
+     */
+    public static boolean isByte(int x) {
+        return (byte) x == x;
+    }
+
+    /**
+     * Determines if a given {@code long} value is the range of unsigned byte
+     * values.
+     */
+    public static boolean isUByte(long x) {
+        return (x & 0xffL) == x;
+    }
+
+    /**
+     * Determines if a given {@code long} value is the range of signed byte
+     * values.
+     */
+    public static boolean isByte(long l) {
+        return (byte) l == l;
+    }
+
+    /**
+     * Determines if a given {@code long} value is the range of unsigned int
+     * values.
+     */
+    public static boolean isUInt(long x) {
+        return (x & 0xffffffffL) == x;
+    }
+
+    /**
+     * Determines if a given {@code long} value is the range of signed int
+     * values.
+     */
+    public static boolean isInt(long l) {
+        return (int) l == l;
+    }
+
+    /**
+     * Determines if a given {@code int} value is the range of signed short
+     * values.
+     */
+    public static boolean isShort(int x) {
+        return (short) x == x;
+    }
+
+    public static boolean isUShort(int s) {
+        return s == (s & 0xFFFF);
+    }
+
+    public static boolean is32bit(long x) {
+        return -0x80000000L <= x && x < 0x80000000L;
+    }
+
+    public static short safeToShort(int v) {
+        assert isShort(v);
+        return (short) v;
+    }
+}