Function vgetmantsd 

unsafe extern "C" fn vgetmantsd(
    a: Simd<f64, 2>,
    b: Simd<f64, 2>,
    mantissas: i32,
    src: Simd<f64, 2>,
    m: u8,
    sae: i32,
) -> Simd<f64, 2>

Available on x86 or x86-64 only.