gistfile1.txt

        [Benchmark]
        public char Test_Condition ()
        {
            return Convert_Condition (14);
        }

        [Benchmark]
        public char Test_String ()
        {
            return Convert_String (14);
        }

        [Benchmark]
        public char Test_ROS ()
        {
            return Convert_ROS (14);
        }

        public static char Convert_Condition (int value)
        {
            value &= 0xF;
            return (char)(value > 9 ? value - 10 + 'A' : value + '0');
        }

        public static char Convert_String (int value)
        {
            return "0123456789ABCDEF"[value & 0xF];
        }

        internal static ReadOnlySpan<byte> ros => new byte[16]
        {
            (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',
            (byte)'8', (byte)'9', (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F'
        };

        public static char Convert_ROS (int value)
        {
            return (char)ros[value & 0xF];
        }