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It will be difficult to implement FFT on the CLA. The CLA only has two address registers MAR0 and MAR1 and you will likely require atleast 4 to keep track of input/outputs from the butterfly of each stage. You will most likely lose more cycles on the CLA doing memory management than actual computation.
To my knowledge, there aren't any FFT routines for the CLA. I would recommend using the fixed point library for the C28 instead.
