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Applying pre- and inprocessing techniques to simplify CNF formulas bothbefore and during search can considerably improve the performance of modern SATsolvers. These algorithms mostly aim at reducing the number of clauses,literals, and variables in the formula. However, to be worthwhile, it isnecessary that their additional runtime does not exceed the runtime savedduring the subsequent SAT solver execution. In this paper we investigate theefficiency and the practicability of selected simplification algorithms forCDCL-based SAT solving. We first analyze them by means of their expected impacton the CNF formula and SAT solving at all. While testing them on real-world andcombinatorial SAT instances, we show which techniques and combinations of themyield a desirable speedup and which ones should be avoided.

Effectiveness of pre- and inprocessing for CDCL-based SAT solving