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annotate graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/UnsignedMath.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/UnsignedMath.java@5e3d1a68664e
children
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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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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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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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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);
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123 }
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124 }