This is the Yosys BTOR backend.
It is developed by Ahmed Irfan <irfan@fbk.eu> - Fondazione Bruno Kessler, Trento, Italy

Master git repository for the BTOR backend:
https://github.com/ahmedirfan1983/yosys/tree/btor


[[CITE]] BTOR: Bit-Precise Modelling of Word-Level Problems for Model Checking 
Johannes Kepler University, Linz, Austria
http://fmv.jku.at/papers/BrummayerBiereLonsing-BPR08.pdf


Todos:
------

- Add checks for unsupported stuff
    - unsupported cell types
    - async resets
    - etc..

- Add support for $lut cells