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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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package org.openjdk.bench.vm.compiler;

import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.*;
import java.util.concurrent.TimeUnit;
import java.util.random.RandomGenerator;
import java.util.random.RandomGeneratorFactory;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
public abstract class VectorBitCount {
    @Param({"1024"})
    public int SIZE;

    @Param("0")
    private int seed;
    private RandomGenerator rng = RandomGeneratorFactory.getDefault().create(seed);
    private int[] bufferRandInts;
    private long[] bufferRandLongs;
    private int[] bitCounts;
    @Setup
    public void init() {
       bufferRandInts = new int[SIZE];
       bufferRandLongs = new long[SIZE];
       bitCounts = new int[SIZE];

        for (int i = 0; i < SIZE; i++) {
            bufferRandInts[i] = rng.nextInt();
            bufferRandLongs[i] = rng.nextLong();
        }
    }

    @Benchmark
    public int[] intBitCount() {
        for (int i = 0; i < SIZE; i++) {
            bitCounts[i] = Integer.bitCount(bufferRandInts[i]);
        }
        return bitCounts;
    }

    @Benchmark
    public int[] longBitCount() {
        for (int i = 0; i < SIZE; i++) {
            bitCounts[i] = Long.bitCount(bufferRandLongs[i]);
        }
        return bitCounts;
    }


    @Fork(value = 2, jvmArgs = {
        "-XX:+UseSuperWord"
    })
    public static class WithSuperword extends VectorBitCount {

    }

    @Fork(value = 2, jvmArgs = {
        "-XX:-UseSuperWord"
    })
    public static class NoSuperword extends VectorBitCount {
    }

}