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mrustc (master)
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#[derive(PartialEq, Eq, Copy, Clone, Hash, Debug, Default)] #[repr(C)] pub struct Complex<T> { /// Real portion of the complex number pub re: T, /// Imaginary portion of the complex number pub im: T, } pub fn separate_re_im(signal: &[Complex<f64>]) -> (Vec<f64>, Vec<f64>) { signal.iter().map(|z| (z.re, z.im)).unzip() } pub fn separate_re_im_2(signal: &[Complex<f64>]) -> (Vec<f64>, Vec<f64>) { const CHUNK_SIZE: usize = 4; const SCRATCH_SIZE: usize = CHUNK_SIZE * 2; let mut reals = Vec::with_capacity(signal.len()); let mut imaginaries = Vec::with_capacity(signal.len()); let iter = signal.chunks_exact(CHUNK_SIZE); let rem = iter.remainder(); let mut scratch = [0f64; SCRATCH_SIZE]; // We don't assume power of 2 size, so we don't use `chunks_exact`. // Process each chunk, including the last chunk which may be smaller. for chunk in iter { let (scr_reals, scr_imags) = scratch.split_at_mut(CHUNK_SIZE); chunk.iter().zip(scr_reals.iter_mut()).zip(scr_imags.iter_mut()) .for_each(|((z, re), im)| { *re = z.re; *im = z.im; }); reals.extend_from_slice(scr_reals); imaginaries.extend_from_slice(scr_imags); } for num in rem { reals.push(num.re); imaginaries.push(num.im); } (reals, imaginaries) } pub fn separate_re_im_3(signal: &[Complex<f64>]) -> (Vec<f64>, Vec<f64>) { const CHUNK_SIZE: usize = 4; const SCRATCH_SIZE: usize = CHUNK_SIZE * 2; let mut reals = Vec::with_capacity(signal.len()); let mut imaginaries = Vec::with_capacity(signal.len()); let iter = signal.chunks_exact(CHUNK_SIZE); let rem = iter.remainder(); let mut scratch = [0f64; SCRATCH_SIZE]; // We don't assume power of 2 size, so we don't use `chunks_exact`. // Process each chunk, including the last chunk which may be smaller. for chunk in iter { let (scr_reals, scr_imags) = scratch.split_at_mut(CHUNK_SIZE); scr_reals[0] = chunk[0].re; scr_reals[1] = chunk[1].re; scr_reals[2] = chunk[2].re; scr_reals[3] = chunk[3].re; scr_imags[0] = chunk[0].im; scr_imags[1] = chunk[1].im; scr_imags[2] = chunk[2].im; scr_imags[3] = chunk[3].im; reals.extend_from_slice(scr_reals); imaginaries.extend_from_slice(scr_imags); } for num in rem { reals.push(num.re); imaginaries.push(num.im); } (reals, imaginaries) }
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