2023

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• Tobias Seufert, Felix Winterer, Christoph Scholl, Karsten Scheibler, Tobias Paxian, Bernd Becker
  Everything You Always Wanted to Know About Generalization of Proof Obligations in PDR
  2023 IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, Band: 42, Nummer: 4, Seiten: 1351 - 1364
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  Kurzfassung

  In this article we revisit the topic of generalizing proof obligations in bit-level Property Directed Reachability (PDR). We provide a comprehensive study which (1) determines the complexity of the problem, (2) thoroughly analyzes limitations of existing methods, (3) introduces approaches to proof obligation generalization that have never been used in the context of PDR, (4) compares the strengths of different methods from a theoretical point of view, and (5) intensively evaluates the methods on various benchmarks from Hardware Model Checking as well as from AI Planning.

2021

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• Tobias Seufert, Felix Winterer, Christoph Scholl, Karsten Scheibler, Tobias Paxian, Bernd Becker
  Everything You Always Wanted to Know About Generalization of Proof Obligations in PDR
  CoRR, Band: 2105.09169, 2021
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  Kurzfassung

  In this paper we revisit the topic of generalizing proof obligations in bit-level Property Directed Reachability (PDR). We provide a comprehensive study which (1) determines the complexity of the problem, (2) thoroughly analyzes limitations of existing methods, (3) introduces approaches to proof obligation generalization that have never been used in the context of PDR, (4) compares the strengths of different methods from a theoretical point of view, and (5) intensively evaluates the methods on various benchmarks from Hardware Model Checking as well as from AI Planning.
• Karsten Scheibler, Felix Winterer, Tobias Seufert, Tino Teige, Christoph Scholl, Bernd Becker
  ICP and IC3
  2021 DATE, IEEE
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  Kurzfassung

  If embedded systems are used in safety-critical environments,they need to meet several standards. For example, in the automotive domain the ISO 26262 standard requires that the software running on such systems does not contain unreachable code. Software model checking is one effective approach to automatically detect such dead code. Being used in a commercial product, iSAT3 already performs very well in this context. In this paper we integrate IC3 into iSAT3 in order to improve its dead code detection capabilities even further.
• Felix Winterer, Tobias Seufert, Karsten Scheibler, Tino Teige, Christoph Scholl, Bernd Becker
  ICP and IC3 with Stronger Generalization
  2021 MBMV
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  Kurzfassung

  on interval abstraction and Interval Constraint Propagation (ICP). As strong generalization is one of the key aspects for the IC3 algorithm to be successful, we integrate two additional generalization schemes from literature into iSAT3+IC3: Inductive Generalization and Counterexamples To Generalization (CTG). Furthermore, we evaluate the benefits and the drawbacks of different variants of these methods in the context of interval abstraction and ICP.