fft_time.adb running
Dell laptop Celeron 500MHz
N= 16 FFT      0.000094000
        inverse  0.000049000
        Both     0.000072000

N= 32 FFT      0.000076000
        inverse  0.000066000
        Both     0.000105000

N= 64 FFT      0.000110000
        inverse  0.000110000
        Both     0.000110000

N= 128 FFT      0.000160000
        inverse  0.000170000
        Both     0.000330000

N= 256 FFT      0.000270000
        inverse  0.000330000
        Both     0.000600000

N= 512 FFT      0.000550000
        inverse  0.000720000
        Both     0.001260000

N= 1024 FFT      0.001260000
        inverse  0.001490000
        Both     0.002740000

N= 2048 FFT      0.002860000
        inverse  0.003180000
        Both     0.006060000

N= 4096 FFT      0.006640000
        inverse  0.006870000
        Both     0.013400000

end fft_time