John Gustafson has ROM-posit tm that is beautiful. ROM-Based Computing with Posits™ The fastest and lowest energy computing is computing you do not have to do at all, because you already have the result. All you have to do is look it up. The unconventional computing model is that math functions other than integer add/subtract would be largely or entirely performed using lookup tables in ROM that are extremely dense, low-latency, and low energy. Posit™ format enables this approach by reducing table size.