1 /* 2 * Copyright (c) 2012, 2016, 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 * @bug 7177917 27 * @summary Micro-benchmark for Math.pow() and Math.exp() 28 * @modules java.base/jdk.internal.misc 29 * @library /test/lib 30 * 31 * @run main compiler.c2.Test7177917 32 */ 33 34 package compiler.c2; 35 36 import jdk.test.lib.Utils; 37 38 import java.util.Random; 39 40 public class Test7177917 { 41 42 static double d; 43 44 static final Random R = Utils.getRandomInstance(); 45 m_pow(double[][] values)46 static long m_pow(double[][] values) { 47 double res = 0; 48 long start = System.nanoTime(); 49 for (int i = 0; i < values.length; i++) { 50 res += Math.pow(values[i][0], values[i][1]); 51 } 52 long stop = System.nanoTime(); 53 d = res; 54 return (stop - start) / 1000; 55 } 56 m_exp(double[] values)57 static long m_exp(double[] values) { 58 double res = 0; 59 long start = System.nanoTime(); 60 for (int i = 0; i < values.length; i++) { 61 res += Math.exp(values[i]); 62 } 63 long stop = System.nanoTime(); 64 d = res; 65 return (stop - start) / 1000; 66 } 67 pow_values(int nb)68 static double[][] pow_values(int nb) { 69 double[][] res = new double[nb][2]; 70 for (int i = 0; i < nb; i++) { 71 double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin 72 double x = Math.abs(Double.longBitsToDouble(R.nextLong())); 73 while (x != x) { 74 x = Math.abs(Double.longBitsToDouble(R.nextLong())); 75 } 76 double logx = Math.log(x) / Math.log(2); 77 double y = ylogx / logx; 78 79 res[i][0] = x; 80 res[i][1] = y; 81 } 82 return res; 83 } 84 exp_values(int nb)85 static double[] exp_values(int nb) { 86 double[] res = new double[nb]; 87 for (int i = 0; i < nb; i++) { 88 double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin 89 double x = Math.E; 90 double logx = Math.log(x) / Math.log(2); 91 double y = ylogx / logx; 92 res[i] = y; 93 } 94 return res; 95 } 96 main(String[] args)97 static public void main(String[] args) { 98 { 99 // warmup 100 double[][] warmup_values = pow_values(10); 101 m_pow(warmup_values); 102 103 for (int i = 0; i < 20000; i++) { 104 m_pow(warmup_values); 105 } 106 // test pow perf 107 double[][] values = pow_values(1000000); 108 System.out.println("==> POW " + m_pow(values)); 109 110 // force uncommon trap 111 double[][] nan_values = new double[1][2]; 112 nan_values[0][0] = Double.NaN; 113 nan_values[0][1] = Double.NaN; 114 m_pow(nan_values); 115 116 // force recompilation 117 for (int i = 0; i < 20000; i++) { 118 m_pow(warmup_values); 119 } 120 121 // test pow perf again 122 System.out.println("==> POW " + m_pow(values)); 123 } 124 { 125 // warmup 126 double[] warmup_values = exp_values(10); 127 m_exp(warmup_values); 128 129 for (int i = 0; i < 20000; i++) { 130 m_exp(warmup_values); 131 } 132 133 // test pow perf 134 double[] values = exp_values(1000000); 135 System.out.println("==> EXP " + m_exp(values)); 136 137 // force uncommon trap 138 double[] nan_values = new double[1]; 139 nan_values[0] = Double.NaN; 140 m_exp(nan_values); 141 142 // force recompilation 143 for (int i = 0; i < 20000; i++) { 144 m_exp(warmup_values); 145 } 146 147 // test pow perf again 148 System.out.println("==> EXP " + m_exp(values)); 149 } 150 } 151 } 152