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butterfly_4

rustfft::sse::sse_radix4

Function butterfly_4 

Source 
unsafe fn butterfly_4<S: SseNum, T: FftNum>(
    data: &mut [Complex<T>],
    twiddles: &[S::VectorType],
    num_ffts: usize,
    rotation: &Rotation90<S::VectorType>,
)