Function gauss_legendre_impl 

pub fn gauss_legendre_impl<P, E, V>(k: V, n: u32) -> (V, V)
where
    P: Policy,
    E: FloatElement,
    V: FloatVector<Element = E> + SpecializedSpecialMath<E>,

The k-th node and weight of the n-point Gauss-Legendre rule, k per lane.