Function cd_poly_horner 

pub unsafe extern "C" fn cd_poly_horner(
    results_r: *mut f64,
    results_i: *mut f64,
    values_r: *const f64,
    values_i: *const f64,
    n_start: slong,
    n_end: slong,
    coefficients_r: *const f64,
    coefficients_i: *const f64,
    n: slong,
)