Mercurial > hg > truffle
annotate graal/com.oracle.max.criutils/src/com/oracle/max/criutils/UnsignedMath.java @ 5871:576460f7e740
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Fri, 20 Jul 2012 14:40:37 +0200 |
parents | 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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24 |
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25 //JaCoCo Exclude |
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26 |
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27 /** |
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28 * Utilities for unsigned comparisons. |
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29 * All methods have correct, but slow, standard Java implementations so that |
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30 * they can be used with compilers not supporting the intrinsics. |
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31 */ |
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32 public class UnsignedMath { |
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33 private static final long MASK = 0xffffffffL; |
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34 |
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35 /** |
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36 * Unsigned comparison aboveThan for two numbers. |
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37 */ |
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38 public static boolean aboveThan(int a, int b) { |
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39 return (a & MASK) > (b & MASK); |
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40 } |
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41 |
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42 /** |
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43 * Unsigned comparison aboveOrEqual for two numbers. |
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44 */ |
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45 public static boolean aboveOrEqual(int a, int b) { |
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46 return (a & MASK) >= (b & MASK); |
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47 } |
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48 |
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49 /** |
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50 * Unsigned comparison belowThan for two numbers. |
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51 */ |
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52 public static boolean belowThan(int a, int b) { |
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53 return (a & MASK) < (b & MASK); |
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54 } |
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55 |
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56 /** |
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57 * Unsigned comparison belowOrEqual for two numbers. |
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58 */ |
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59 public static boolean belowOrEqual(int a, int b) { |
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60 return (a & MASK) <= (b & MASK); |
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61 } |
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62 |
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63 /** |
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64 * Unsigned comparison aboveThan for two numbers. |
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65 */ |
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66 public static boolean aboveThan(long a, long b) { |
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67 return (a > b) ^ ((a < 0) != (b < 0)); |
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68 } |
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69 |
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70 /** |
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71 * Unsigned comparison aboveOrEqual for two numbers. |
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72 */ |
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73 public static boolean aboveOrEqual(long a, long b) { |
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74 return (a >= b) ^ ((a < 0) != (b < 0)); |
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75 } |
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76 |
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77 /** |
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78 * Unsigned comparison belowThan for two numbers. |
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79 */ |
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80 public static boolean belowThan(long a, long b) { |
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81 return (a < b) ^ ((a < 0) != (b < 0)); |
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82 } |
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83 |
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84 /** |
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85 * Unsigned comparison belowOrEqual for two numbers. |
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86 */ |
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87 public static boolean belowOrEqual(long a, long b) { |
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88 return (a <= b) ^ ((a < 0) != (b < 0)); |
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89 } |
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90 } |
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91 |