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May 22, 2021 at 5:23 comment added Arnold Neumaier @skbmoore: FFTW uses specific FFTs for sizes $\le16$. But these are apparently optimized for many factors, not just for the operation count.
May 22, 2021 at 5:21 history edited Arnold Neumaier CC BY-SA 4.0
added precision requirement
May 21, 2021 at 20:43 history became hot network question
May 21, 2021 at 19:02 history edited LSpice CC BY-SA 4.0
Capitalise first word of title
May 21, 2021 at 18:54 answer added Steve Huntsman timeline score: 6
May 21, 2021 at 16:20 comment added skbmoore Not an expert in this, but you might want to examine the wiki for 'Fastest Fourier Transform in the West.' Supposedly it is free to noncommercial users. A statement that seems to be relevant is '...FFTW uses hard-coded unrolled FFTs for these small sizes...'
May 21, 2021 at 12:48 history edited YCor
edited tags
May 21, 2021 at 12:45 comment added Carlo Beenakker This will depend on the precision you demand for the output, won't it?
May 21, 2021 at 12:40 history asked Arnold Neumaier CC BY-SA 4.0