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annotate graal/com.oracle.max.criutils/src/com/oracle/max/criutils/UnsignedMath.java @ 5728:956217932b8c

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moved classes from com.oracle.max.cri.util to com.oracle.max.crituils
author Doug Simon <doug.simon@oracle.com>
date Thu, 28 Jun 2012 14:15:00 +0200
parents graal/com.oracle.max.cri/src/com/oracle/max/cri/util/UnsignedMath.java@4d7175cf3526
children a3d71693e0ce
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1 /*
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2 * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.criutils;
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25 /**
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26 * Utilities for unsigned comparisons.
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27 * All methods have correct, but slow, standard Java implementations so that
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28 * they can be used with compilers not supporting the intrinsics.
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29 */
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30 public class UnsignedMath {
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31 private static final long MASK = 0xffffffffL;
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32
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33 /**
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34 * Unsigned comparison aboveThan for two numbers.
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35 */
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36 public static boolean aboveThan(int a, int b) {
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37 return (a & MASK) > (b & MASK);
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38 }
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39
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40 /**
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41 * Unsigned comparison aboveOrEqual for two numbers.
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42 */
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43 public static boolean aboveOrEqual(int a, int b) {
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44 return (a & MASK) >= (b & MASK);
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45 }
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47 /**
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48 * Unsigned comparison belowThan for two numbers.
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49 */
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50 public static boolean belowThan(int a, int b) {
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51 return (a & MASK) < (b & MASK);
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52 }
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53
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54 /**
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55 * Unsigned comparison belowOrEqual for two numbers.
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56 */
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57 public static boolean belowOrEqual(int a, int b) {
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58 return (a & MASK) <= (b & MASK);
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59 }
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61 /**
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62 * Unsigned comparison aboveThan for two numbers.
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63 */
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64 public static boolean aboveThan(long a, long b) {
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65 return (a > b) ^ ((a < 0) != (b < 0));
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66 }
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68 /**
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69 * Unsigned comparison aboveOrEqual for two numbers.
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70 */
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71 public static boolean aboveOrEqual(long a, long b) {
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72 return (a >= b) ^ ((a < 0) != (b < 0));
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73 }
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75 /**
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76 * Unsigned comparison belowThan for two numbers.
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77 */
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78 public static boolean belowThan(long a, long b) {
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79 return (a < b) ^ ((a < 0) != (b < 0));
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80 }
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82 /**
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83 * Unsigned comparison belowOrEqual for two numbers.
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84 */
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85 public static boolean belowOrEqual(long a, long b) {
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86 return (a <= b) ^ ((a < 0) != (b < 0));
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87 }
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88 }
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89