Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.max.cri/src/com/oracle/max/cri/intrinsics/UnsignedMath.java @ 3733:e233f5660da4
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author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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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.intrinsics; |
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24 |
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25 import static com.oracle.max.cri.intrinsics.IntrinsicIDs.*; |
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26 |
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27 import java.math.*; |
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28 |
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29 import com.sun.max.annotate.*; |
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30 |
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31 /** |
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32 * {@link INTRINSIC} method definitions for unsigned comparisons. |
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33 * All methods have correct, but slow, standard Java implementations so that |
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34 * they can be used with compilers not supporting the intrinsics. |
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35 */ |
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36 public class UnsignedMath { |
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37 private static final long MASK = 0xffffffffL; |
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38 |
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39 /** |
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40 * @see IntrinsicIDs#UCMP_AT |
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41 */ |
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42 @INTRINSIC(UCMP_AT) |
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43 public static boolean aboveThan(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 * @see IntrinsicIDs#UCMP_AE |
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49 */ |
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50 @INTRINSIC(UCMP_AE) |
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51 public static boolean aboveOrEqual(int a, int b) { |
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52 return (a & MASK) >= (b & MASK); |
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53 } |
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54 |
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55 /** |
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56 * @see IntrinsicIDs#UCMP_BT |
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57 */ |
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58 @INTRINSIC(UCMP_BT) |
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59 public static boolean belowThan(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 * @see IntrinsicIDs#UCMP_BE |
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65 */ |
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66 @INTRINSIC(UCMP_BE) |
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67 public static boolean belowOrEqual(int a, int b) { |
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68 return (a & MASK) <= (b & MASK); |
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69 } |
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70 |
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71 |
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72 /** |
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73 * @see IntrinsicIDs#UCMP_AT |
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74 */ |
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75 @INTRINSIC(UCMP_AT) |
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76 public static boolean aboveThan(long a, long b) { |
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77 return (a > b) ^ ((a < 0) != (b < 0)); |
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78 } |
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79 |
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80 /** |
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81 * @see IntrinsicIDs#UCMP_AE |
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82 */ |
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83 @INTRINSIC(UCMP_AE) |
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84 public static boolean aboveOrEqual(long a, long b) { |
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85 return (a >= b) ^ ((a < 0) != (b < 0)); |
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86 } |
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87 |
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88 /** |
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89 * @see IntrinsicIDs#UCMP_BT |
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90 */ |
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91 @INTRINSIC(UCMP_BT) |
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92 public static boolean belowThan(long a, long b) { |
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93 return (a < b) ^ ((a < 0) != (b < 0)); |
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94 } |
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95 |
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96 /** |
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97 * @see IntrinsicIDs#UCMP_BE |
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98 */ |
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99 @INTRINSIC(UCMP_BE) |
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100 public static boolean belowOrEqual(long a, long b) { |
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101 return (a <= b) ^ ((a < 0) != (b < 0)); |
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102 } |
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103 |
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104 |
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105 /** |
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106 * @see IntrinsicIDs#UDIV |
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107 */ |
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108 @INTRINSIC(UDIV) |
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109 public static int divide(int a, int b) { |
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110 return (int) ((a & MASK) / (b & MASK)); |
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111 } |
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112 |
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113 /** |
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114 * @see IntrinsicIDs#UREM |
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115 */ |
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116 @INTRINSIC(UREM) |
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117 public static int remainder(int a, int b) { |
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118 return (int) ((a & MASK) % (b & MASK)); |
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119 } |
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120 |
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121 |
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122 /** |
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123 * @see IntrinsicIDs#UDIV |
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124 */ |
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125 @INTRINSIC(UDIV) |
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126 public static long divide(long a, long b) { |
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127 return bi(a).divide(bi(b)).longValue(); |
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128 } |
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129 |
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130 /** |
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131 * @see IntrinsicIDs#UREM |
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132 */ |
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133 @INTRINSIC(UREM) |
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134 public static long remainder(long a, long b) { |
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135 return bi(a).remainder(bi(b)).longValue(); |
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136 } |
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137 |
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138 private static BigInteger bi(long unsigned) { |
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139 return unsigned >= 0 ? BigInteger.valueOf(unsigned) : BigInteger.valueOf(unsigned & 0x7fffffffffffffffL).setBit(63); |
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140 } |
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141 } |
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142 |