Bench

bench.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Running;
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Linq;
using System.Collections.Generic;

namespace ConsoleApp1
{

    public class Program
    {
         static void Main(string[] args) {
 
            var summary = BenchmarkRunner.Run<Bench95>();
        }
    }
    
[DisassemblyDiagnoser]
    public class Bench95
    {
        private int[] _a = new int[1000];
        private int _i = 1000;

        [GlobalSetup]
        public void Setup()
        {
            _a[0] = 1;
        }


        [Benchmark(Baseline = true)]
        [MethodImpl(MethodImplOptions.NoInlining)]
        public void A()
        {
            var i = _i;
            var a = _a;
            LoopA(a, i);
        }

        [MethodImpl(MethodImplOptions.NoInlining)]
        void LoopA(int[] a, int i)
        {
            do
            {
                if (a[0] == 0)
                    break;
                i--;
            }
            while (i != 0);
        }

        [Benchmark()]
        [MethodImpl(MethodImplOptions.NoInlining)]
        public void B()
        {
            var i = _i;
            var a = _a;
            LoopB(a, i);
        }

        [MethodImpl(MethodImplOptions.NoInlining)]
        void LoopB(int[] a, int i)
        {
            while (a[0] != 0)
            {
                i--;
                if (i == 0)
                    break;
            }
        }
    }
}