def classinit_pic_dif_bit_width(cls):
    """
        Decorator that adds the PIC dif_bit_width static table to *cls*.
        """
    cls._dif_bit_width = []
    for i in range(0, 128):
        cls._dif_bit_width.append((2 * i).bit_length())
    for i in range(-128, 0):
        cls._dif_bit_width.append((-2 * i - 1).bit_length())
    return cls
