can GMP FFT be accessed directly?

[David Hillman]

Hi,

I'm wondering whether it is possible currently for a user to access the 
GMP FFT directly. That is: intercept the results after the convolution 
and before the last step where things are added at the appropriate digit 
place and carrying is done and so forth.

If so, how? (I didn't see this in the manual.) And if not, wouldn't that 
be a good idea? (For people who want to do convolution, and not 
multiplication?)

David