Switch-Case_Optimization.cs

SwitchBench

using PowerUp.Core;
using PowerUp.Core.Console;
using System;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Threading;

using BenchmarkDotNet;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using BenchmarkDotNet.Order;
using System.Collections.Generic;

[Orderer(SummaryOrderPolicy.SlowestToFastest, MethodOrderPolicy.Declared)]
public class SwitchBench
{
    private int[] data = new int[64];

    [GlobalSetup]
    public void Data()
    {
        Random rnd = new Random();
        for (int i = 0; i < data.Length; i++)
            data[i] = rnd.Next(0, 4);
    }

    [Benchmark(Baseline = true)]
    //[ArgumentsSource(nameof(Numbers))]
    public int MultiSwitchUniform()
    {
        int s = 0;
        foreach (var n in data)
            s+=MultiSwitch(n, n);
        return s;
    }

    public int MultiSwitch(int x, int y)
    {
        switch (x, y)
        {
            case (1, 1): return 1;   
            case (2, 2): return 2;   
            case (3, 3): return 3;   
        }
        return 0;
    }

    [Benchmark]
    //[ArgumentsSource(nameof(Numbers))]
    public int MultiSwitchCustomUniform()
    {
        int s = 0;
        foreach (var n in data)
            s+=MultiSwitchCustom(n, n);
        return s;
    }

    public int MultiSwitchCustom(int x, int y)
    {
        switch (x)
        {
            case 1:
                {
                    if (y != 1) break;
                    return 1;
                }
            case 2:
                {
                    if (y != 2) break;
                    return 2;
                }
            case 3:
                {
                    if (y != 3) break;
                    return 3;
                }
        }
        return 0;
    }
}