Function f_estrin_polyeval7 

pub(crate) fn f_estrin_polyeval7<T: PolyevalMla + Copy + Mul<T, Output = T>>(
    x: T,
    a0: T,
    a1: T,
    a2: T,
    a3: T,
    a4: T,
    a5: T,
    a6: T,
) -> T