fft_time.c Athlon 1.4GHz Suse Linux N=16 FFT time=0 inv time=1e-06 both time=1e-06 N=32 FFT time=1e-06 inv time=2e-06 both time=2e-06 N=64 FFT time=4e-06 inv time=2e-06 both time=6e-06 N=128 FFT time=5e-06 inv time=1e-05 both time=1e-05 N=256 FFT time=1e-05 inv time=2e-05 both time=2e-05 N=512 FFT time=4e-05 inv time=2e-05 both time=6e-05 N=1024 FFT time=5e-05 inv time=1e-04 both time=1e-04 N=2048 FFT time=0.0001 inv time=0.0002 both time=0.0003 N=4096 FFT time=0.0002 inv time=0.0004 both time=0.0006