using System;
using System.Diagnostics;

internal class TestUnsafe
{
    public static unsafe void Main()
    {
        var array = new int[256 * 1048576];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = i;
        }

        //Trace.Fail("breakpoint");

        int sum;
        var timer = Stopwatch.StartNew();
        {
            sum = 0;
            for (int i = 0; i < array.Length; i += 8)
            {
                sum += array[i] + array[i + 1] + array[i + 2] + array[i + 3] + array[i + 4] + array[i + 5] + array[i + 6] + array[i + 7];
            }
        }
        timer.Stop();

        Console.WriteLine("Safe: {0}ms, sum = {1}", timer.ElapsedMilliseconds, sum);

        fixed (int* arrayPointer = array)
        {
            int* p = arrayPointer;
            timer.Reset();

            timer.Start();
            {
                sum = 0;
                for (int i = 0; i < array.Length; i += 8)
                {
                    sum += *p++ + *p++ + *p++ + *p++ + *p++ + *p++ + *p++ + *p++;
                }
            }
            timer.Stop();
            Console.WriteLine("Unsafe: {0}ms, sum = {1}", timer.ElapsedMilliseconds, sum);
        }

        Console.ReadLine();
    }
}