jdk/test/micro/org/openjdk/bench/java/lang/PointerComparison.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package org.openjdk.bench.java.lang;

import org.openjdk.jmh.annotations.*;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.random.RandomGenerator;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(3)
public class PointerComparison {
    static final int INVOCATIONS = 1024;

    Object[] o1;
    Object[] o2;
    int[] res;
    long[] resLong;
    float[] resFloat;
    double[] resDouble;

    @Setup
    public void setup() {
        var random = RandomGenerator.getDefault();
        o1 = new Object[INVOCATIONS];
        o2 = new Object[INVOCATIONS];
        res = new int[INVOCATIONS];
        resLong = new long[INVOCATIONS];
        resFloat = new float[INVOCATIONS];
        resDouble = new double[INVOCATIONS];
        for (int i = 0; i < INVOCATIONS; i++) {
            o1[i] = new Object();
        }
        List<Object> list = Arrays.asList(o1);
        Collections.shuffle(list);
        list.toArray(o2);
    }

    @Benchmark
    public void equalObject() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (o1[i] == o2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void notEqualObject() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (o1[i] != o2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void equalObjectResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (o1[i] == o2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void notEqualObjectResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (o1[i] != o2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void equalObjecResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (o1[i] == o2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void notEqualObjecResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (o1[i] != o2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void equalObjecResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (o1[i] == o2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void notEqualObjecResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (o1[i] != o2[i]) ? 0.1 : 0.2;
        }
    }
}