Glancing at your code diff, I think you're missing the bit-reversed permutation. Either way, feel free to steal from: https://www.nayuki.io/page/free-small-fft-

Glancing at your code diff, I think you're missing the bit-reversed permutation. Either way, feel free to steal from: https://www.nayuki.io/page/free-small-fft-in-multiple-languages https://www.nayuki.io/page/free-small-fft-in-multiple-langua...