Combine two guids in one using Xor with SIMD operations

CombineTwoGuidsInOne.cs

void Main()
{
	var providerId = Guid.Parse("6dac0000-17be-e460-ad92-08dc8fb0aee8").Dump("ProviderId"); // NewId.Next().ToGuid().Dump();
	var parkingSessionId = Guid.Parse("ec000000-5d59-0015-eafd-08dc9b3476c8").Dump("ParkingSession Id"); // NewId.Next().ToGuid().Dump();
	// var secondId = Guid.Parse("ec000000-5d59-0015-c615-08dc9b3578ff").Dump("Second Id"); // NewId.NextGuid().Dump();

	//var result = new List<(int index, Guid id, Guid combined)>();
	//
	//for (var i = 0; i <= 10; i++)
	//{
	//	var id = NewId.NextGuid();
	//	
	//	result.Add((index: i, id: id, combined: providerId.Xor(id).Dump($"ProviderId Xor Id '{id}'")));
	//}
	
	providerId.Xor(parkingSessionId).Dump("ProviderId Xor ParkingSessionId");
	
	// result.Add(providerId.Xor(secondId).Dump("ProviderId Xor SecondId"));
	
	// var ordered = result.OrderBy(x => x.combined).Dump();
	
	
	/// result = firstId.CombineGuids(secondId).Dump();
}

public static class Extensions
{
	// https://stackoverflow.com/questions/1383030/how-to-combine-two-guid-values
	public static Guid Xor(this Guid a, Guid b)
	{
		if (Sse2.IsSupported)
		{
			var result = Sse2.Xor(Unsafe.As<Guid, Vector128<long>>(ref a), Unsafe.As<Guid, Vector128<long>>(ref b));
			
			return Unsafe.As<Vector128<long>, Guid>(ref result);
		}

		var spanA = MemoryMarshal.CreateSpan(ref Unsafe.As<Guid, long>(ref a), 2);
		var spanB = MemoryMarshal.CreateSpan(ref Unsafe.As<Guid, long>(ref b), 2);

		spanB[0] ^= spanA[0];
		spanB[1] ^= spanA[1];

		return b;
	}
}