A tale of two solvers: Eager and lazy approaches to bit-vectors
Hadarean, Liana, Bansal, Kshitij, Jovanović, Dejan, Barrett, Clark, & Tinelli, Cesare (2014) A tale of two solvers: Eager and lazy approaches to bit-vectors. Lecture Notes in Computer Science [Proceedings of the 26th Conference in Computer Aided Verification, CAV 2014], 8559, pp. 680-695.
The standard method for deciding bit-vector constraints is via eager reduction to propositional logic. This is usually done after first applying powerful rewrite techniques. While often efficient in practice, this method does not scale on problems for which top-level rewrites cannot reduce the problem size sufficiently. A lazy solver can target such problems by doing many satisfiability checks, each of which only reasons about a small subset of the problem. In addition, the lazy approach enables a wide range of optimization techniques that are not available to the eager approach. In this paper we describe the architecture and features of our lazy solver (LBV). We provide a comparative analysis of the eager and lazy approaches, and show how they are complementary in terms of the types of problems they can efficiently solve. For this reason, we propose a portfolio approach that runs a lazy and eager solver in parallel. Our empirical evaluation shows that the lazy solver can solve problems none of the eager solvers can and that the portfolio solver outperforms other solvers both in terms of total number of problems solved and the time taken to solve them.
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|Item Type:||Journal Article|
|Additional Information:||Computer Aided Verification: 26th International Conference, CAV 2014, Held as Part of the Vienna Summer of Logic, VSL 2014, Vienna, Austria, July 18-22, 2014. Proceedings. Online ISBN 978-3-319-08867-9|
|Keywords:||Logics and Meanings of Programs, Software Engineering/Programming and Operating Systems|
|Divisions:||Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2014 Springer International Publishing Switzerland|
|Copyright Statement:||The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-08867-9_45|
|Deposited On:||06 Apr 2015 23:36|
|Last Modified:||11 Apr 2015 02:25|
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