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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/ExactMath.java @ 18163:c88ab4f1f04a

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re-enabled Checkstyle with the release of 6.0 that supports Java 8; fixed existing Checkstyle warnings
author Doug Simon <doug.simon@oracle.com>
date Fri, 24 Oct 2014 16:18:10 +0200
parents 6a13c422fca4
children
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a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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1 /*
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2 * Copyright (c) 2012, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api;
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26
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27 /**
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28 * This class contains methods that will be part of java.lang.Math starting with JDK 8. Until JDK 8
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29 * is release, we duplicate them here because they are generally useful for dynamic language
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30 * implementations.
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31 */
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32 public class ExactMath {
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33
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34 public static int addExact(int x, int y) {
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35 int r = x + y;
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36 // HD 2-12 Overflow iff both arguments have the opposite sign of the result
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37 if (((x ^ r) & (y ^ r)) < 0) {
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38 throw new ArithmeticException("integer overflow");
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39 }
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40 return r;
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41 }
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42
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43 public static long addExact(long x, long y) {
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44 long r = x + y;
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45 // HD 2-12 Overflow iff both arguments have the opposite sign of the result
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46 if (((x ^ r) & (y ^ r)) < 0) {
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47 throw new ArithmeticException("long overflow");
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48 }
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49 return r;
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50 }
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51
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52 public static int subtractExact(int x, int y) {
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53 int r = x - y;
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54 // HD 2-12 Overflow iff the arguments have different signs and
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55 // the sign of the result is different than the sign of x
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56 if (((x ^ y) & (x ^ r)) < 0) {
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57 throw new ArithmeticException("integer overflow");
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58 }
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59 return r;
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60 }
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61
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62 public static long subtractExact(long x, long y) {
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63 long r = x - y;
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64 // HD 2-12 Overflow iff the arguments have different signs and
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65 // the sign of the result is different than the sign of x
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66 if (((x ^ y) & (x ^ r)) < 0) {
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67 throw new ArithmeticException("long overflow");
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68 }
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69 return r;
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70 }
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72 public static int multiplyExact(int x, int y) {
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73 long r = (long) x * (long) y;
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74 if ((int) r != r) {
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75 throw new ArithmeticException("long overflow");
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76 }
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77 return (int) r;
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78 }
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79
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80 public static long multiplyExact(long x, long y) {
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81 long r = x * y;
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82 long ax = Math.abs(x);
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83 long ay = Math.abs(y);
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84 if (((ax | ay) >>> 31 != 0)) {
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85 // Some bits greater than 2^31 that might cause overflow
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86 // Check the result using the divide operator
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87 // and check for the special case of Long.MIN_VALUE * -1
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88 if (((y != 0) && (r / y != x)) || (x == Long.MIN_VALUE && y == -1)) {
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89 throw new ArithmeticException("long overflow");
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90 }
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91 }
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92 return r;
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93 }
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94
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95 public static int multiplyHigh(int x, int y) {
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96 long r = (long) x * (long) y;
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97 return (int) (r >> 32);
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98 }
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99
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100 public static int multiplyHighUnsigned(int x, int y) {
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101 long xl = x & 0xFFFFFFFFL;
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102 long yl = y & 0xFFFFFFFFL;
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103 long r = xl * yl;
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104 return (int) (r >> 32);
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105 }
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106
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107 public static long multiplyHigh(long x, long y) {
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108 // Checkstyle: stop
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109 long x0, y0, z0;
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110 long x1, y1, z1, z2, t;
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111 // Checkstyle: resume
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112
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113 x0 = x & 0xFFFFFFFFL;
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114 x1 = x >> 32;
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115
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116 y0 = y & 0xFFFFFFFFL;
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117 y1 = y >> 32;
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118
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119 z0 = x0 * y0;
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120 t = x1 * y0 + (z0 >>> 32);
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121 z1 = t & 0xFFFFFFFFL;
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122 z2 = t >> 32;
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123 z1 += x0 * y1;
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124
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125 return x1 * y1 + z2 + (z1 >> 32);
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126 }
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127
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128 public static long multiplyHighUnsigned(long x, long y) {
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129 // Checkstyle: stop
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130 long x0, y0, z0;
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131 long x1, y1, z1, z2, t;
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132 // Checkstyle: resume
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133
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134 x0 = x & 0xFFFFFFFFL;
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135 x1 = x >>> 32;
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136
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137 y0 = y & 0xFFFFFFFFL;
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138 y1 = y >>> 32;
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139
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140 z0 = x0 * y0;
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141 t = x1 * y0 + (z0 >>> 32);
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142 z1 = t & 0xFFFFFFFFL;
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143 z2 = t >>> 32;
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144 z1 += x0 * y1;
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145
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146 return x1 * y1 + z2 + (z1 >>> 32);
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147 }
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148 }