1 /* 2 * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @key randomness 27 * @bug 7177917 28 * @summary Micro-benchmark for Math.pow() and Math.exp() 29 * @modules java.base/jdk.internal.misc 30 * @library /test/lib 31 * 32 * @run main compiler.c2.Test7177917 33 */ 34 35 package compiler.c2; 36 37 import jdk.test.lib.Utils; 38 39 import java.util.Random; 40 41 public class Test7177917 { 42 43 static double d; 44 45 static final Random R = Utils.getRandomInstance(); 46 m_pow(double[][] values)47 static long m_pow(double[][] values) { 48 double res = 0; 49 long start = System.nanoTime(); 50 for (int i = 0; i < values.length; i++) { 51 res += Math.pow(values[i][0], values[i][1]); 52 } 53 long stop = System.nanoTime(); 54 d = res; 55 return (stop - start) / 1000; 56 } 57 m_exp(double[] values)58 static long m_exp(double[] values) { 59 double res = 0; 60 long start = System.nanoTime(); 61 for (int i = 0; i < values.length; i++) { 62 res += Math.exp(values[i]); 63 } 64 long stop = System.nanoTime(); 65 d = res; 66 return (stop - start) / 1000; 67 } 68 pow_values(int nb)69 static double[][] pow_values(int nb) { 70 double[][] res = new double[nb][2]; 71 for (int i = 0; i < nb; i++) { 72 double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin 73 double x = Math.abs(Double.longBitsToDouble(R.nextLong())); 74 while (x != x) { 75 x = Math.abs(Double.longBitsToDouble(R.nextLong())); 76 } 77 double logx = Math.log(x) / Math.log(2); 78 double y = ylogx / logx; 79 80 res[i][0] = x; 81 res[i][1] = y; 82 } 83 return res; 84 } 85 exp_values(int nb)86 static double[] exp_values(int nb) { 87 double[] res = new double[nb]; 88 for (int i = 0; i < nb; i++) { 89 double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin 90 double x = Math.E; 91 double logx = Math.log(x) / Math.log(2); 92 double y = ylogx / logx; 93 res[i] = y; 94 } 95 return res; 96 } 97 main(String[] args)98 static public void main(String[] args) { 99 { 100 // warmup 101 double[][] warmup_values = pow_values(10); 102 m_pow(warmup_values); 103 104 for (int i = 0; i < 20000; i++) { 105 m_pow(warmup_values); 106 } 107 // test pow perf 108 double[][] values = pow_values(1000000); 109 System.out.println("==> POW " + m_pow(values)); 110 111 // force uncommon trap 112 double[][] nan_values = new double[1][2]; 113 nan_values[0][0] = Double.NaN; 114 nan_values[0][1] = Double.NaN; 115 m_pow(nan_values); 116 117 // force recompilation 118 for (int i = 0; i < 20000; i++) { 119 m_pow(warmup_values); 120 } 121 122 // test pow perf again 123 System.out.println("==> POW " + m_pow(values)); 124 } 125 { 126 // warmup 127 double[] warmup_values = exp_values(10); 128 m_exp(warmup_values); 129 130 for (int i = 0; i < 20000; i++) { 131 m_exp(warmup_values); 132 } 133 134 // test pow perf 135 double[] values = exp_values(1000000); 136 System.out.println("==> EXP " + m_exp(values)); 137 138 // force uncommon trap 139 double[] nan_values = new double[1]; 140 nan_values[0] = Double.NaN; 141 m_exp(nan_values); 142 143 // force recompilation 144 for (int i = 0; i < 20000; i++) { 145 m_exp(warmup_values); 146 } 147 148 // test pow perf again 149 System.out.println("==> EXP " + m_exp(values)); 150 } 151 } 152 } 153