using System;

using System.Threading;

using System.Threading.Tasks;

using System.Diagnostics;

using System.Linq;

​

const Int32 bits = 100_000_000;

const Int32 n = bits/32;

Int32[] x =  new Int32[n]; 

Int32[] y =  new Int32[n]; 

Int32 countOnes = 0;

Int32 countOnesZip = 0;

Int32 countOnesPar = 0;

Random random = new Random();

for (int i = 0; i < n; i++)

{

    x[i] = random.Next();

    y[i] = random.Next();

 }

​

Stopwatch stopwatch = Stopwatch.StartNew();

for (int i = 0; i < n; i++) { 

    countOnes += Int32.PopCount( x[i] & y[i]); 

}

stopwatch.Stop(); long elapsed = stopwatch.ElapsedMilliseconds;

​

stopwatch.Restart();

foreach( var (a,b) in x.Zip(y) ) { 

    countOnesZip += Int32.PopCount( a & b); 

}

stopwatch.Stop(); long elapsed_zip = stopwatch.ElapsedMilliseconds;

​

stopwatch.Restart();

Parallel.For(0, n, i =>

{

    Interlocked.Add(ref countOnesPar, Int32.PopCount(x[i] & y[i]));

});

stopwatch.Stop(); long elapsed_par = stopwatch.ElapsedMilliseconds;

​

Console.WriteLine($"Processed {bits:N0} bits");

Console.WriteLine($"Elapsed time (For): {elapsed,13}ms Count: {countOnes:N0}");

Console.WriteLine($"Elapsed time (ForEach): {elapsed_zip,9}ms Count: {countOnesZip:N0}");

Console.WriteLine($"Elapsed time (Parallel.For): {elapsed_par,4}ms Count: {countOnesPar:N0}");