/*

 * Copyright (c) 2015, 2015, 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.

 */

package micro.benchmarks;

import java.util.Random;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.annotations.Warmup;

/**

 * Benchmarks cost of Math intrinsics.

 */

public class MathFunctionBenchmark extends BenchmarkBase {

    @State(Scope.Benchmark)

    public static class ThreadState {

        double[] data = randomDoubles(100);

        double[] result = new double[100];

        static double[] randomDoubles(int len) {

            double[] data = new double[len];

            Random r = new Random();

            for (int i = 0; i < data.length; i++) {

                data[i] = r.nextDouble();

            }

            return data;

        }

    }

    @Benchmark

    @Warmup(iterations = 5)

    public void mathLog(ThreadState state) {

        double[] data = state.data;

        for (int i = 0; i < data.length; i++) {

            double[] result = state.result;

            result[i] = Math.log(data[i]);

        }

    }

    @Benchmark

    @Warmup(iterations = 5)

    public void mathLog10(ThreadState state) {

        double[] data = state.data;

        for (int i = 0; i < data.length; i++) {

            double[] result = state.result;

            result[i] = Math.log10(data[i]);

        }

    }

    @Benchmark

    @Warmup(iterations = 5)

    public void mathSin(ThreadState state) {

        double[] data = state.data;

        for (int i = 0; i < data.length; i++) {

            double[] result = state.result;

            result[i] = Math.sin(data[i]);

        }

    }

    @Benchmark

    @Warmup(iterations = 5)

    public void mathCos(ThreadState state) {

        double[] data = state.data;

        for (int i = 0; i < data.length; i++) {

            double[] result = state.result;

            result[i] = Math.cos(data[i]);

        }

    }

    @Benchmark

    @Warmup(iterations = 5)

    public void mathTan(ThreadState state) {

        double[] data = state.data;

        for (int i = 0; i < data.length; i++) {

            double[] result = state.result;

            result[i] = Math.tan(data[i]);

        }

    }

}