On a vector of length 8192 (a power of 2, natch), fft-complex-radix2-forward 
takes about 1/8 of a second (lost in the noise, essentially), but 
fft-complex-forward takes more than 24 seconds, a difference of about 200x.  
They do produce the same answers, up to differences of 1e-4 in the magnitude 
(didn't check the phase).

1) Is this expected? I thought the non-radix2 one was still fairly clever about 
subdividing when the number of points is divisible by 2.
2) If so, would it make sense to test for powers of 2?

John Clements

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