Increasing Proofs Automation Rate Of Atelier-B Thanks To Alt-Ergo

In this paper, we report on our recent improvements in the Alt-Ergo SMT solver to make it effective in discharging proof obligations (POs) translated from the Atelier-B framework. In particular, we made important modifications in its internal data structures to boost performances of its core decision procedures, we improved quantifiers instantiation heuristics, and enhanced the interaction between the SAT solver and the decision procedures. We also introduced a new plugin architecture to facilitate experiments with different SAT engines, and implemented a profiling plugin to track and identify "bottlenecks" when a formula requires a long time to be discharged, or makes the solver time-out. Experiments made with more than 10,000 POs generated from real industrial B projects show significant improvements compared to both previous versions of Alt-Ergo and Atelier-B's automatic main prover.