0 FLOPS those MCUs only support IMBC instructions. No hardware floating point, at least it has integer multiplication/division. My estimate is maybe 1-8Gflop total using software float. If you avoid float and design around fixed point, might do some interesting stuff.
IIRC, the Connection Machine CM-1 also was not designed for floating point ops, but Richard Feynman convinced Danny Hillis that it could compete with supercomputers in the scientific market.