Mercurial > hg > truffle
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/util/UnsignedMath.java @ 4266:e2499e6d8aa7
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
parents | 8c9c0e1eaab1 |
children | 4d7175cf3526 |
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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.cri.util; |
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24 |
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25 /** |
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26 * {@link INTRINSIC} method definitions 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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46 |
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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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60 |
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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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67 |
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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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74 |
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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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81 |
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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 |