public static Vector256 <long> op_Multiply(Vector256 <long> vector, long scalar) => Vector256.Create(Vector128 <long> .op_Multiply(vector.Lower, scalar), Vector128 <long> .op_Multiply(vector.Upper, scalar));
public static Vector256 <long> op_Multiply(Vector256 <long> left, Vector256 <long> right) => Vector256.Create(Vector128 <long> .op_Multiply(left.Lower, right.Lower), Vector128 <long> .op_Multiply(left.Upper, right.Upper));