153 lines
4.1 KiB
Java
153 lines
4.1 KiB
Java
/*
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* Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @key randomness
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* @bug 7177917
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* @summary Micro-benchmark for Math.pow() and Math.exp()
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* @modules java.base/jdk.internal.misc
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* @library /test/lib
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*
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* @run main compiler.c2.Test7177917
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*/
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package compiler.c2;
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import jdk.test.lib.Utils;
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import java.util.Random;
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public class Test7177917 {
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static double d;
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static final Random R = Utils.getRandomInstance();
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static long m_pow(double[][] values) {
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double res = 0;
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long start = System.nanoTime();
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for (int i = 0; i < values.length; i++) {
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res += Math.pow(values[i][0], values[i][1]);
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}
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long stop = System.nanoTime();
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d = res;
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return (stop - start) / 1000;
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}
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static long m_exp(double[] values) {
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double res = 0;
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long start = System.nanoTime();
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for (int i = 0; i < values.length; i++) {
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res += Math.exp(values[i]);
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}
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long stop = System.nanoTime();
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d = res;
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return (stop - start) / 1000;
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}
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static double[][] pow_values(int nb) {
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double[][] res = new double[nb][2];
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for (int i = 0; i < nb; i++) {
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double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
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double x = Math.abs(Double.longBitsToDouble(R.nextLong()));
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while (x != x) {
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x = Math.abs(Double.longBitsToDouble(R.nextLong()));
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}
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double logx = Math.log(x) / Math.log(2);
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double y = ylogx / logx;
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res[i][0] = x;
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res[i][1] = y;
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}
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return res;
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}
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static double[] exp_values(int nb) {
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double[] res = new double[nb];
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for (int i = 0; i < nb; i++) {
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double ylogx = (1 + (R.nextDouble() * 2045)) - 1023; // 2045 rather than 2046 as a safety margin
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double x = Math.E;
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double logx = Math.log(x) / Math.log(2);
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double y = ylogx / logx;
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res[i] = y;
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}
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return res;
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}
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static public void main(String[] args) {
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{
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// warmup
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double[][] warmup_values = pow_values(10);
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m_pow(warmup_values);
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for (int i = 0; i < 20000; i++) {
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m_pow(warmup_values);
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}
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// test pow perf
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double[][] values = pow_values(1000000);
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System.out.println("==> POW " + m_pow(values));
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// force uncommon trap
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double[][] nan_values = new double[1][2];
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nan_values[0][0] = Double.NaN;
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nan_values[0][1] = Double.NaN;
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m_pow(nan_values);
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// force recompilation
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for (int i = 0; i < 20000; i++) {
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m_pow(warmup_values);
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}
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// test pow perf again
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System.out.println("==> POW " + m_pow(values));
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}
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{
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// warmup
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double[] warmup_values = exp_values(10);
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m_exp(warmup_values);
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for (int i = 0; i < 20000; i++) {
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m_exp(warmup_values);
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}
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// test pow perf
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double[] values = exp_values(1000000);
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System.out.println("==> EXP " + m_exp(values));
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// force uncommon trap
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double[] nan_values = new double[1];
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nan_values[0] = Double.NaN;
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m_exp(nan_values);
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// force recompilation
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for (int i = 0; i < 20000; i++) {
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m_exp(warmup_values);
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}
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// test pow perf again
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System.out.println("==> EXP " + m_exp(values));
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}
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}
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}
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