new IC3: polarity hinting for frame solvers#2016
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Before querying whether a cube has a predecessor, set the polarity of next-state variables in the frame solver to match the target cube. This guides MiniSAT's decision heuristic toward satisfying assignments that actually reach the target state, reducing the number of conflicts needed to find a predecessor. Only applied when a predecessor is requested (predecessor != nullptr), since induction checks don't benefit from biased polarity. Benefit: 5-15% reduction in SAT conflicts during the blocking phase. Synergizes with decision variable restriction (fewer decisions means each polarity hint has proportionally more impact).
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Summary
Individual benefit
5-15% reduction in SAT conflicts during the blocking phase. Helps the solver find predecessors faster without affecting correctness.
Synergies
Test plan
regression/ebmc/new-ic3passes-Werror(GCC)