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6205
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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.
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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 */
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24
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25 /*
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26 * Micro-benchmark for Math.pow() and Math.exp()
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27 */
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28
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29 import java.util.*;
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30
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31 public class Test7177917 {
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32
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33 static double d;
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34
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35 static Random r = new Random(0);
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36
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37 static long m_pow(double[][] values) {
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38 double res = 0;
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39 long start = System.nanoTime();
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40 for (int i = 0; i < values.length; i++) {
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41 res += Math.pow(values[i][0], values[i][1]);
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42 }
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43 long stop = System.nanoTime();
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44 d = res;
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45 return (stop - start) / 1000;
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46 }
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47
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48 static long m_exp(double[] values) {
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49 double res = 0;
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50 long start = System.nanoTime();
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51 for (int i = 0; i < values.length; i++) {
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52 res += Math.exp(values[i]);
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53 }
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54 long stop = System.nanoTime();
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55 d = res;
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56 return (stop - start) / 1000;
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57 }
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58
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59 static double[][] pow_values(int nb) {
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60 double[][] res = new double[nb][2];
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61 for (int i = 0; i < nb; i++) {
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62 double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
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63 double x = Math.abs(Double.longBitsToDouble(r.nextLong()));
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64 while (x != x) {
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65 x = Math.abs(Double.longBitsToDouble(r.nextLong()));
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66 }
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67 double logx = Math.log(x) / Math.log(2);
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68 double y = ylogx / logx;
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69
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70 res[i][0] = x;
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71 res[i][1] = y;
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72 }
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73 return res;
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74 }
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75
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76 static double[] exp_values(int nb) {
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77 double[] res = new double[nb];
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78 for (int i = 0; i < nb; i++) {
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79 double ylogx = (1 + (r.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
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80 double x = Math.E;
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81 double logx = Math.log(x) / Math.log(2);
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82 double y = ylogx / logx;
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83 res[i] = y;
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84 }
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85 return res;
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86 }
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87
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88 static public void main(String[] args) {
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89 {
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90 // warmup
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91 double[][] warmup_values = pow_values(10);
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92 m_pow(warmup_values);
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93
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94 for (int i = 0; i < 20000; i++) {
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95 m_pow(warmup_values);
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96 }
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97 // test pow perf
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98 double[][] values = pow_values(1000000);
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99 System.out.println("==> POW " + m_pow(values));
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100
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101 // force uncommon trap
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102 double[][] nan_values = new double[1][2];
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103 nan_values[0][0] = Double.NaN;
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104 nan_values[0][1] = Double.NaN;
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105 m_pow(nan_values);
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106
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107 // force recompilation
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108 for (int i = 0; i < 20000; i++) {
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109 m_pow(warmup_values);
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110 }
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111
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112 // test pow perf again
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113 System.out.println("==> POW " + m_pow(values));
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114 }
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115 {
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116 // warmup
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117 double[] warmup_values = exp_values(10);
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118 m_exp(warmup_values);
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119
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120 for (int i = 0; i < 20000; i++) {
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121 m_exp(warmup_values);
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122 }
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123
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124 // test pow perf
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125 double[] values = exp_values(1000000);
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126 System.out.println("==> EXP " + m_exp(values));
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127
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128 // force uncommon trap
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129 double[] nan_values = new double[1];
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130 nan_values[0] = Double.NaN;
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131 m_exp(nan_values);
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132
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133 // force recompilation
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134 for (int i = 0; i < 20000; i++) {
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135 m_exp(warmup_values);
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136 }
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137
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138 // test pow perf again
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139 System.out.println("==> EXP " + m_exp(values));
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140 }
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141 }
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142 }
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