/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2020, Arm Limited. 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 org.openjdk.bench.java.lang;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.results.Result;
import org.openjdk.jmh.results.RunResult;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import org.openjdk.jmh.runner.options.TimeValue;




import java.util.concurrent.TimeUnit;
import java.util.Arrays;

class MyClass {
 public int field1;
 public int field2;
 public int field3;

 public MyClass(int val) {
   field1 = val;
   field2 = val;
   field3 = val;
 }
}

@State(Scope.Thread)
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Warmup(iterations = 10, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(value = 3)
public class ArrayCopyObject {
    @Param({"31", "63", "127" , "2047" , "4095", "8191"}) private int size;

    private MyClass [] src;
    private MyClass [] dst;

    @Setup
    public void setup() {
      src = new MyClass[size];
      dst = new MyClass[size];
      for (int i = 0; i < src.length ; i++) {
        src[i] = new MyClass(i);
        dst[i] = new MyClass(0);
      }
    }

    @Benchmark
    public void disjoint_micro() {
      System.arraycopy(src, 0 , dst, 0 , size);
    }

    @Benchmark
    public void conjoint_micro() {
      System.arraycopy(src, 0 , src, 10 , size - 10 );
    }

    public static void main(String[] args) throws RunnerException {
       String [] base_opts =
          { "-XX:+UnlockDiagnosticVMOptions ",
            "-XX:+IgnoreUnrecognizedVMOptions ",
          "-XX:UseAVX=3" };
       String [] opts_str1 = {"-XX:-UseCompressedOops "};
       String [] opts_str2 = {"-XX:+UseCompressedOops "};

       Options baseOpts = new OptionsBuilder()
          .include(ArrayCopyObject.class.getName())
          .warmupTime(TimeValue.seconds(30))
          .measurementTime(TimeValue.seconds(10))
          .warmupIterations(1)
          .measurementIterations(2)
          .jvmArgs(base_opts)
          .forks(1)
          .build();

       RunResult r1 = new Runner(new OptionsBuilder()
         .parent(baseOpts)
         .jvmArgs(opts_str1)
         .build()).runSingle();

       RunResult r2 = new Runner(new OptionsBuilder()
         .parent(baseOpts)
         .jvmArgs(opts_str2)
         .build()).runSingle();

        System.out.println(r1.getPrimaryResult().getScore() + r2.getPrimaryResult().getScore());
    }
}