fft_time.adb running
N= 16 FFT      0.000004696
        inverse  0.000005239
        Both     0.000007889

N= 32 FFT      0.000008243
        inverse  0.000009414
        Both     0.000015629

N= 64 FFT      0.000016606
        inverse  0.000019392
        Both     0.000034097

N= 128 FFT      0.000036144
        inverse  0.000041690
        Both     0.000075813

N= 256 FFT      0.000079632
        inverse  0.000087334
        Both     0.000164969

N= 512 FFT      0.000175494
        inverse  0.000188925
        Both     0.000360192

N= 1024 FFT      0.000390429
        inverse  0.000442704
        Both     0.000830859

N= 2048 FFT      0.000888568
        inverse  0.000899906
        Both     0.001786100

N= 4096 FFT      0.001868616
        inverse  0.001837556
        Both     0.003704010

end fft_time