Function f_polyeval13 

pub(crate) fn f_polyeval13<T: PolyevalMla + Copy + Mul<T, Output = T>>(
    x: T,
    a0: T,
    a1: T,
    a2: T,
    a3: T,
    a4: T,
    a5: T,
    a6: T,
    a7: T,
    a8: T,
    a9: T,
    a10: T,
    a11: T,
    a12: T,
) -> T