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44 lines
1.3 KiB
Text
44 lines
1.3 KiB
Text
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TODO before FFTW-$2\pi$:
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* figure out how to autodetect NEON at runtime
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* figure out the arm cycle counter business
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* Wisdom: make it clear that it is specific to the exact fftw version
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and configuration. Report error codes when reading wisdom. Maybe
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have multiple system wisdom files, one per version?
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* DCT/DST codelets? which kinds?
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* investigate the addition-chain trig computation
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* I can't believe that there isn't a closed form for the omega
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array in Rader.
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* convolution problem type(s)
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* Explore the idea of having n < 0 in tensors, possibly to mean
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inverse DFT.
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* better estimator: possibly, let "other" cost be coef * n, where
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coef is a per-solver constant determined via some big numerical
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optimization/fit.
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* vector radix, multidimensional codelets
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* it may be a good idea to unify all those little loops that do
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copying, (X[i], X[n-i]) <- (X[i] + X[n-i], X[i] - X[n-i]),
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and multiplication of vectors by twiddle factors.
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* Pruned FFTs (basically, a vecloop that skips zeros).
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* Try FFTPACK-style back-and-forth (Stockham) FFT. (We tried this a
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few years ago and it was slower, but perhaps matters have changed.)
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* Generate assembly directly for more processors, or maybe fork gcc. =)
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* ensure that threaded solvers generate (block_size % 4 == 0)
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to allow SIMD to be used.
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* memoize triggen.
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