IPAddress.GetHashCode Comparison.cs

[MemoryDiagnoser]
public class Program
{
    private const int NumberOfLabels = IPAddressParserStatics.IPv6AddressBytes / 2;
    private static readonly uint ScopeId;
    private static readonly ushort[] Numbers;

    static Program()
    {
        var ipAddress = IPAddress.Parse("2001:4860:4860::8888");
        var bytes = ipAddress.GetAddressBytes();
        ScopeId = (uint)ipAddress.ScopeId;
        Numbers = new ushort[NumberOfLabels];
        for (var i = 0; i < NumberOfLabels; i ++)
        {
            Numbers[i] = (ushort)(bytes[i * 2] << sizeof(byte) | bytes[i * 2 + 1]);
        }
    }

    public static void Main() => BenchmarkRunner.Run<Program>();

    [Benchmark]
    public int GetHashCodeToString() =>
        StringComparer.OrdinalIgnoreCase.GetHashCode(IPAddressParser.IPv6AddressToString(Numbers, ScopeId));

    [Benchmark]
    public int GetHashCodeHashHelpers()
    {
        var hashCode = HashHelpers.Combine(HashHelpers.RandomSeed, unchecked((int)ScopeId));
        for (int i = 0; i < NumberOfLabels; i += 2)
        {
            hashCode = HashHelpers.Combine(hashCode, Numbers[i] << 16 | Numbers[i + 1]);
        }

        return hashCode;
    }
}