Mercurial > hg > truffle
annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/UnsignedMath.java @ 21689:ed234a3178af
Behavior of null-like values is now part of the TCK
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Wed, 03 Jun 2015 10:17:19 +0200 |
parents | 48c1ebd24120 |
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rev | line source |
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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.jvmci.code; |
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24 |
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25 import java.math.*; |
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26 |
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27 //JaCoCo Exclude |
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28 |
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29 /** |
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30 * Utilities for unsigned comparisons. All methods have correct, but slow, standard Java |
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31 * implementations so that they can be used with compilers not supporting the intrinsics. |
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32 */ |
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33 public class UnsignedMath { |
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34 |
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35 private static final long MASK = 0xffffffffL; |
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36 |
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37 /** |
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38 * Unsigned comparison aboveThan for two numbers. |
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39 */ |
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40 public static boolean aboveThan(int a, int b) { |
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41 return (a & MASK) > (b & MASK); |
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42 } |
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43 |
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44 /** |
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45 * Unsigned comparison aboveOrEqual for two numbers. |
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46 */ |
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47 public static boolean aboveOrEqual(int a, int b) { |
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48 return (a & MASK) >= (b & MASK); |
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49 } |
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50 |
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51 /** |
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52 * Unsigned comparison belowThan for two numbers. |
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53 */ |
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54 public static boolean belowThan(int a, int b) { |
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55 return (a & MASK) < (b & MASK); |
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56 } |
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57 |
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58 /** |
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59 * Unsigned comparison belowOrEqual for two numbers. |
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60 */ |
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61 public static boolean belowOrEqual(int a, int b) { |
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62 return (a & MASK) <= (b & MASK); |
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63 } |
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64 |
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65 /** |
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66 * Unsigned comparison aboveThan for two numbers. |
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67 */ |
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68 public static boolean aboveThan(long a, long b) { |
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69 return (a > b) ^ ((a < 0) != (b < 0)); |
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70 } |
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71 |
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72 /** |
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73 * Unsigned comparison aboveOrEqual for two numbers. |
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74 */ |
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75 public static boolean aboveOrEqual(long a, long b) { |
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76 return (a >= b) ^ ((a < 0) != (b < 0)); |
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77 } |
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78 |
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79 /** |
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80 * Unsigned comparison belowThan for two numbers. |
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81 */ |
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82 public static boolean belowThan(long a, long b) { |
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83 return (a < b) ^ ((a < 0) != (b < 0)); |
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84 } |
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85 |
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86 /** |
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87 * Unsigned comparison belowOrEqual for two numbers. |
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88 */ |
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89 public static boolean belowOrEqual(long a, long b) { |
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90 return (a <= b) ^ ((a < 0) != (b < 0)); |
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91 } |
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92 |
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93 /** |
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94 * Unsigned division for two numbers. |
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95 */ |
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96 public static int divide(int a, int b) { |
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97 return (int) ((a & MASK) / (b & MASK)); |
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98 } |
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99 |
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100 /** |
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101 * Unsigned remainder for two numbers. |
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102 */ |
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103 public static int remainder(int a, int b) { |
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104 return (int) ((a & MASK) % (b & MASK)); |
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105 } |
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106 |
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107 /** |
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108 * Unsigned division for two numbers. |
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109 */ |
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110 public static long divide(long a, long b) { |
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111 return bi(a).divide(bi(b)).longValue(); |
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112 } |
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113 |
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114 /** |
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115 * Unsigned remainder for two numbers. |
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116 */ |
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117 public static long remainder(long a, long b) { |
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118 return bi(a).remainder(bi(b)).longValue(); |
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119 } |
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120 |
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121 private static BigInteger bi(long unsigned) { |
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122 return unsigned >= 0 ? BigInteger.valueOf(unsigned) : BigInteger.valueOf(unsigned & 0x7fffffffffffffffL).setBit(63); |
2912b72d840a
More complete and reusable Word type
Christian Wimmer <christian.wimmer@oracle.com>
parents:
6501
diff
changeset
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123 } |
3733
e233f5660da4
Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
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124 } |