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package org.openjdk.bench.java.math;

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

@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Thread)
public class FpMaxMinBenchmark {

  public final int TESTSIZE = 2048;

  public float[] FargV1;
  public float[] FargV2;
  public double[] DargV1;
  public double[] DargV2;

  public final float[] FspecialVals = {
      0.0f, -0.0f, Float.NaN, Float.NEGATIVE_INFINITY, Float.POSITIVE_INFINITY};

  public final double[] DspecialVals = {
      0.0, -0.0, Double.NaN, Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY};

  @Setup(Level.Trial)
  public void BmSetup() {
    Random r = new Random();
    FargV1 = new float[TESTSIZE];
    FargV2 = new float[TESTSIZE];
    DargV1 = new double[TESTSIZE];
    DargV2 = new double[TESTSIZE];

    for (int i = 0; i < TESTSIZE; i++) {
      FargV1[i] = r.nextFloat() * 100f;
      FargV2[i] = r.nextFloat() * 100f;
      DargV1[i] = r.nextDouble() * 100f;
      DargV2[i] = r.nextDouble() * 100f;
    }

    for (int i = 0, j = 0; i < TESTSIZE; i += 100) {
      FargV1[i] = FspecialVals[j++ % FspecialVals.length];
      DargV1[i] = DspecialVals[j++ % DspecialVals.length];
    }

    for (int i = 50, j = 0; i < TESTSIZE; i += 50) {
      FargV2[i] = FspecialVals[j++ % FspecialVals.length];
      DargV2[i] = DspecialVals[j++ % DspecialVals.length];
    }
  }

  @Benchmark
  @OperationsPerInvocation(TESTSIZE *TESTSIZE)
  public void testMaxF(Blackhole bh) {
    float Res = 0.0f;
    for (int i = 0; i < TESTSIZE * TESTSIZE; i++)
      Res = Math.max(FargV1[i % TESTSIZE], FargV2[i % TESTSIZE]);
    bh.consume(Res);
  }

  @Benchmark
  @OperationsPerInvocation(TESTSIZE *TESTSIZE)
  public void testMaxD(Blackhole bh) {
    double Res = 0.0;
    for (int i = 0; i < TESTSIZE * TESTSIZE; i++)
      Res = Math.max(DargV1[i % TESTSIZE], DargV2[i % TESTSIZE]);
    bh.consume(Res);
  }

  @Benchmark
  @OperationsPerInvocation(TESTSIZE *TESTSIZE)
  public void testMinF(Blackhole bh) {
    float Res = 0.0f;
    for (int i = 0; i < TESTSIZE * TESTSIZE; i++)
      Res = Math.min(FargV1[i % TESTSIZE], FargV2[i % TESTSIZE]);
    bh.consume(Res);
  }

  @Benchmark
  @OperationsPerInvocation(TESTSIZE *TESTSIZE)
  public void testMinD(Blackhole bh) {
    double Res = 0.0;
    for (int i = 0; i < TESTSIZE * TESTSIZE; i++)
      Res = Math.min(DargV1[i % TESTSIZE], DargV2[i % TESTSIZE]);
    bh.consume(Res);
  }
}