// determine best FFT method based on size liquid_fft_method liquid_fft_estimate_method(unsigned int _nfft) { if (_nfft == 0) { // invalid length fprintf(stderr,"error: liquid_fft_estimate_method(), fft size must be > 0\n"); return LIQUID_FFT_METHOD_UNKNOWN; } else if (_nfft <= 8 || _nfft==11 || _nfft==13 || _nfft==16 || _nfft==17) { // use simple DFT return LIQUID_FFT_METHOD_DFT; } else if (fft_is_radix2(_nfft)) { // transform is of the form 2^m #if 0 // use radix-2 algorithm return LIQUID_FFT_METHOD_RADIX2; #else // acutally, prefer Cooley-Tukey algorithm return LIQUID_FFT_METHOD_MIXED_RADIX; #endif } else if (liquid_is_prime(_nfft)) { // prefer Rader's alternate method (using radix-2 transform) // unless _nfft-1 is also radix2 // TODO : also prefer Rader-I if _nfft-1 is mostly factors of 2 if ( fft_is_radix2(_nfft-1) ) return LIQUID_FFT_METHOD_RADER; else return LIQUID_FFT_METHOD_RADER2; } // last resort //return LIQUID_FFT_METHOD_DFT; // use slow DFT method return LIQUID_FFT_METHOD_MIXED_RADIX; // use mixed radix method }
// // AUTOTEST: test for small primes // void autotest_prime_small() { const int is_prime_array[2500] = { 0,0,1,1,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0, 0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0, 0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,1, 0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,1,0,1, 0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0, 0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0, 0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,1, 0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0, 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