Function ifftn_simd 

pub fn ifftn_simd<T>(
    _x: &[T],
    _shape: Option<&[usize]>,
    _axes: Option<&[usize]>,
    _norm: Option<&str>,
) -> FFTResult<ArrayD<Complex64>>
where
    T: NumCast + Copy + Debug + 'static,

SIMD-accelerated N-dimensional inverse FFT