fp64_abs (res, arg); // absolute number
fp64_neg (res, arg); // unary negative
fp64_add (res, l, r); // addition (l + r)
fp64_add_c (res_r, res_i, l_r, l_i, r_r, r_i); // complex add
fp64_sub (res, l, r); // subtraction (l - r)
fp64_sub_c (res_r, res_i, l_r, l_i, r_r, r_i); // complex subtraction
fp64_mul (res, l, r); // multiplation (l * r)
fp64_mul_c (res_r, res_i, l_r, l_i, r_r, r_i); // complex multiplicaiton
fp64_div (res, l, r); // division (l / r)
fp64_div_c (res_r, res_i, l_r, l_i, r_r, r_i); // complex division
fp64_rem (res, l, r); // remainder
fp64_sqrt (res, arg); // square root
fp64_log (res, base, arg); // log
fp64_ln (res, arg); // ln
fp64_pow_fp (res, l, r); // l**r, where l and r are fp64
fp64_pow (res, l, r); // l**r, where l is fp64 and r is integer
fp64_sin (res, arg); // sin
fp64_cos (res, arg); // cos
fp64_tan (res, arg); // tan
fp64_arc_sin (res, arg); // arcsin
fp64_arc_cos (res, arg); // arccos
fp64_arc_tan (res, arg); // arctan
fp64_equ (res, l, r); // =
fp64_not_equ (res, l, r); // !=
fp64_gteq (res, l, r); // >=
fp64_lteq (res, l, r); // <=
fp64_gt (res, l, r); // >
fp64_lt (res, l, r); // <
integer_to_fp64 (res, arg); // integer input, fp64 output
 real_to_fp64 (res, arg); // real input, fp64 output
    used for passing the bit patterns across the ports.
    driver (net_r);
    receiver (net_r);
signed_to_fp64 (res, arg);// signed, parameter: width
unsigned_to_fp64 (res, arg); // unsigned, parameter: width
fp64_to_integer (res, arg); // fp64 to integer
fp64_to_unsigned (res, arg); // fp64 to unsigned, parameter: width
fp64_to_signed (res, arg); // fp64 to signed, parameter: width
fp64_to_real (res, arg); // fp64 to real
fp64_Copysign (res, x, y); // copies sign of x to y
fp64_Scalb (res, y, n); // multiplies y by 2**n (where n is an integer)
fp64_Logb (res, arg);  // returns the log (base 2) of arg
fp64_Nextafter (res, x, y); // Gives you the next logical number after x
fp64_Finite (res, x); // returns "1" if x is not infinity.
fp64_Isnan (res, x); // returns "1" is x in any type of NAN
fp64_Class (res, x);
fp64_Unordered (res, x, y); // returns "1" if x or y is a NAN.