public class CountTruesBenchmarks
    {
        private readonly bool[] boolArray;

        public CountTruesBenchmarks()
        {
            var rnd = new Random(42);
            boolArray = Enumerable.Range(0, 500).Select(_ => rnd.NextBoolean()).ToArray();
        }

        [Benchmark]
        public int CountTruesFor()
        {
            var count = 0;
            for (int i = 0; i < boolArray.Length; i++)
            {
                if (boolArray[i])
                {
                    count++;
                }
            }

            return count;
        }

        [Benchmark]
        public int CountTruesForEach()
        {
            var count = 0;
            foreach (var b in boolArray)
            {
                if (b)
                {
                    count++;
                }
            }

            return count;
        }


        [Benchmark]
        public int CountTruesLinq()
        {
            return boolArray.Count(b => b);
        }

        [Benchmark]
        public unsafe int CountTruesAvx2()
        {
            var count = 0;

            if (Avx2.IsSupported)
            {
                var maxBatchIndex = boolArray.Length - boolArray.Length % Vector256<byte>.Count;
                if (maxBatchIndex > 0)
                {
                    var zerosVector = Vector256<byte>.Zero;
                    fixed (bool* boolArrayPtr = boolArray)
                    {
                        var boolArrayBytePtr = (byte*) boolArrayPtr;
                        for (int i = 0; i < maxBatchIndex; i += Vector256<byte>.Count)
                        {
                            var batchVector = Avx.LoadVector256(boolArrayBytePtr + i);
                            var comparisonResult = Avx2.CompareEqual(batchVector, zerosVector);
                            var nonZeroMask = ~(uint) Avx2.MoveMask(comparisonResult);
                            var nonZeroCount = Popcnt.PopCount(nonZeroMask);
                            count += (int) nonZeroCount;
                        }
                    }
                }

                if (maxBatchIndex < boolArray.Length)
                {
                    for (int i = maxBatchIndex; i < boolArray.Length; i++)
                    {
                        if (boolArray[i])
                        {
                            count++;
                        }
                    }
                }
            }
            else
            {
                for (int i = 0; i < boolArray.Length; i++)
                {
                    if (boolArray[i])
                    {
                        count++;
                    }
                }
            }

            return count;
        }
    }