[isabelle] FFT.thy ?

In Sascha's and Jasmin's talk at CADE they mentioned "FFT" in their benchmarks, i.e. fast fourier transform as they confirmed in personal communication.

From the most recent clone 01d6ab227069 I get nothing by

    Isabelle/src$ find -name "F*.thy"
    Isabelle/src$ grep -r "ourier" *

I'd be grateful for another hint,

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