| /* |
| * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| /** |
| * @test |
| * @bug 7177917 |
| * @summary Micro-benchmark for Math.pow() and Math.exp() |
| * @modules java.base/jdk.internal.misc |
| * @library /test/lib |
| * |
| * @run main compiler.c2.Test7177917 |
| */ |
| |
| package compiler.c2; |
| |
| import jdk.test.lib.Utils; |
| |
| import java.util.Random; |
| |
| public class Test7177917 { |
| |
| static double d; |
| |
| static final Random R = Utils.getRandomInstance(); |
| |
| static long m_pow(double[][] values) { |
| double res = 0; |
| long start = System.nanoTime(); |
| for (int i = 0; i < values.length; i++) { |
| res += Math.pow(values[i][0], values[i][1]); |
| } |
| long stop = System.nanoTime(); |
| d = res; |
| return (stop - start) / 1000; |
| } |
| |
| static long m_exp(double[] values) { |
| double res = 0; |
| long start = System.nanoTime(); |
| for (int i = 0; i < values.length; i++) { |
| res += Math.exp(values[i]); |
| } |
| long stop = System.nanoTime(); |
| d = res; |
| return (stop - start) / 1000; |
| } |
| |
| static double[][] pow_values(int nb) { |
| double[][] res = new double[nb][2]; |
| for (int i = 0; i < nb; i++) { |
| double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin |
| double x = Math.abs(Double.longBitsToDouble(R.nextLong())); |
| while (x != x) { |
| x = Math.abs(Double.longBitsToDouble(R.nextLong())); |
| } |
| double logx = Math.log(x) / Math.log(2); |
| double y = ylogx / logx; |
| |
| res[i][0] = x; |
| res[i][1] = y; |
| } |
| return res; |
| } |
| |
| static double[] exp_values(int nb) { |
| double[] res = new double[nb]; |
| for (int i = 0; i < nb; i++) { |
| double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin |
| double x = Math.E; |
| double logx = Math.log(x) / Math.log(2); |
| double y = ylogx / logx; |
| res[i] = y; |
| } |
| return res; |
| } |
| |
| static public void main(String[] args) { |
| { |
| // warmup |
| double[][] warmup_values = pow_values(10); |
| m_pow(warmup_values); |
| |
| for (int i = 0; i < 20000; i++) { |
| m_pow(warmup_values); |
| } |
| // test pow perf |
| double[][] values = pow_values(1000000); |
| System.out.println("==> POW " + m_pow(values)); |
| |
| // force uncommon trap |
| double[][] nan_values = new double[1][2]; |
| nan_values[0][0] = Double.NaN; |
| nan_values[0][1] = Double.NaN; |
| m_pow(nan_values); |
| |
| // force recompilation |
| for (int i = 0; i < 20000; i++) { |
| m_pow(warmup_values); |
| } |
| |
| // test pow perf again |
| System.out.println("==> POW " + m_pow(values)); |
| } |
| { |
| // warmup |
| double[] warmup_values = exp_values(10); |
| m_exp(warmup_values); |
| |
| for (int i = 0; i < 20000; i++) { |
| m_exp(warmup_values); |
| } |
| |
| // test pow perf |
| double[] values = exp_values(1000000); |
| System.out.println("==> EXP " + m_exp(values)); |
| |
| // force uncommon trap |
| double[] nan_values = new double[1]; |
| nan_values[0] = Double.NaN; |
| m_exp(nan_values); |
| |
| // force recompilation |
| for (int i = 0; i < 20000; i++) { |
| m_exp(warmup_values); |
| } |
| |
| // test pow perf again |
| System.out.println("==> EXP " + m_exp(values)); |
| } |
| } |
| } |