Fast decode a string IP address

IP2Location.cs

// Related to this benchmark article https://stebet.net/benchmarking-and-performance-optimizations-in-c-using-benchmarkdotnet/

public static class IP2Locationxoofx
{
	public static uint IPAddressToInteger(string input)
	{
		uint ipAddress = 0;
		uint acc = 0;
		// Note: we assume that the string is well formed
		foreach (var c in input)
		{
			if (c == '.')
			{
				ipAddress = (ipAddress << 8) | acc;
				acc = 0;
			}
			else
			{
				acc = acc*10 + (uint)(c - '0');
			}
		}
		ipAddress = (ipAddress << 8) | acc;
		return ipAddress;
	}
}

// Results:
//
//                   Method |      Median |    StdDev |  Gen 0 | Gen 1 | Gen 2 | Bytes Allocated/Op |
// ------------------------ |------------ |---------- |------- |------ |------ |------------------- |
//  BenchIP2LocationHelper7 | 270.6996 ns | 1.5360 ns | 585.00 |     - |     - |              61.62 |
//    BenchIP2Locationxoofx |  17.3949 ns | 0.1378 ns |      - |     - |     - |               0.00 |