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IPASIR-UP: User Propagators for CDCL

Authors Katalin Fazekas , Aina Niemetz , Mathias Preiner , Markus Kirchweger , Stefan Szeider , Armin Biere

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Author Details

Katalin Fazekas
  • TU Wien, Austria
Aina Niemetz
  • Stanford University, CA, USA
Mathias Preiner
  • Stanford University, CA, USA
Markus Kirchweger
  • TU Wien, Austria
Stefan Szeider
  • TU Wien, Austria
Armin Biere
  • Universität Freiburg, Germany

Funding

This work was supported in part by the Stanford Center for Automated Reasoning, the Stanford Center for Blockchain Research, a gift from Amazon Web Services, by the Austrian Science Fund (FWF) under projects No. T-1306 and P-32441, and by the Vienna Science and Technology Fund (WWTF) under project No. ICT19-065 (Reveal-AI).

Acknowledgements

The authors would like to thank the reviewers for their thoughtful comments and helpful suggestions on improving this paper.

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Katalin Fazekas, Aina Niemetz, Mathias Preiner, Markus Kirchweger, Stefan Szeider, and Armin Biere. IPASIR-UP: User Propagators for CDCL. In 26th International Conference on Theory and Applications of Satisfiability Testing (SAT 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 271, pp. 8:1-8:13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023) https://doi.org/10.4230/LIPIcs.SAT.2023.8

Abstract

Modern SAT solvers are frequently embedded as sub-reasoning engines into more complex tools for addressing problems beyond the Boolean satisfiability problem. Examples include solvers for Satisfiability Modulo Theories (SMT), combinatorial optimization, model enumeration and counting. In such use cases, the SAT solver is often able to provide relevant information beyond the satisfiability answer. Further, domain knowledge of the embedding system (e.g., symmetry properties or theory axioms) can be beneficial for the CDCL search, but cannot be efficiently represented in clausal form. In this paper, we propose a general interface to inspect and influence the internal behaviour of CDCL SAT solvers. Our goal is to capture the most essential functionalities that are sufficient to simplify and improve use cases that require a more fine-grained interaction with the SAT solver than provided via the standard IPASIR interface. For our experiments, we extend CaDiCaL with our interface and evaluate it on two representative use cases: enumerating graphs within the SAT modulo Symmetries framework (SMS), and as the main CDCL(T) SAT engine of the SMT solver cvc5.

Subject Classification

ACM Subject Classification
  • Theory of computation → Automated reasoning
Keywords
  • SAT
  • CDCL
  • Satisfiability Modulo Theories
  • Satisfiability Modulo Symmetries

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