package org.openjdk;

import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;

@Warmup(iterations = 20, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(3)
@State(Scope.Thread)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class ObjectInit {

    @Benchmark
    @Fork(jvmArgsAppend = {"-XX:-Inline", "-XX:+TieredCompilation"})
    public Object tiered() {
        return new Object();
    }

    @Benchmark
    @Fork(jvmArgsAppend = {"-XX:-Inline", "-XX:-TieredCompilation"})
    public Object nonTiered() {
        return new Object();
    }

    /*
        With MDO checks:
          java.lang.Object.<init>()V is accepted by code size = 1

            Benchmark             Mode  Cnt  Score   Error  Units
            ObjectInit.nonTiered  avgt   15  5.431 ± 0.129  ns/op
            ObjectInit.tiered     avgt   15  5.979 ± 0.088  ns/op <--- OOPS

        Without MDO checks:

            Benchmark             Mode  Cnt  Score   Error  Units
            ObjectInit.nonTiered  avgt   15  5.440 ± 0.152  ns/op
            ObjectInit.tiered     avgt   15  5.492 ± 0.158  ns/op
     */

}