fft_time.adb running 266MHz Pentium II -O2 N= 16 FFT 0.000184200 inverse 0.000189300 Both 0.000204300 N= 32 FFT 0.000208300 inverse 0.000214300 Both 0.000252400 N= 64 FFT 0.000250000 inverse 0.000271000 Both 0.000350000 N= 128 FFT 0.000361000 inverse 0.000380000 Both 0.000581000 N= 256 FFT 0.000591000 inverse 0.000671000 Both 0.001081000 N= 512 FFT 0.001122000 inverse 0.001292000 Both 0.002243000 N= 1024 FFT 0.002253000 inverse 0.002574000 Both 0.004647000 N= 2048 FFT 0.005026000 inverse 0.005548000 Both 0.010436000 N= 4096 FFT 0.010515000 inverse 0.013379000 Both 0.023734000 end fft_time