  IC3 is a famous bit-level framework for safety verification. By incorporating
datapath abstraction, a notable enhancement in the efficiency of hardware
verification can be achieved. However, datapath abstraction entails a coarse
level of abstraction where all datapath operations are approximated as
uninterpreted functions. This level of abstraction, albeit useful, can lead to
an increased computational burden during the verification process as it
necessitates extensive exploration of redundant abstract state space.
  In this paper, we introduce a novel approach called datapath propagation. Our
method involves leveraging concrete constant values to iteratively compute the
outcomes of relevant datapath operations and their associated uninterpreted
functions. Meanwhile, we generate potentially useful datapath propagation
lemmas in abstract state space and tighten the datapath abstraction. With this
technique, the abstract state space can be reduced, and the verification
efficiency is significantly improved. We implemented the proposed approach and
conducted extensive experiments. The results show promising improvements of our
approach compared to the state-of-the-art verifiers.
