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Content Provider | ACM Digital Library |
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Author | Mishchenko, Alan Kuehlmann, Andreas Brayton, Robert Chatterjee, Satrajit |
Abstract | Modern combinational equivalence checking (CEC) engines are complicated programs which are difficult to verify. In this paper we show how a modern CEC engine can be modified to produce a proof of equivalence when it proves a miter unsatisfiable. If the CEC engine formulates the problem as a single SAT instance (call this naive), one can use the resolution proof of unsatisfiability as a proof of equivalence. However, a modern CEC engine does not directly invoke a SAT solver for the whole miter, but instead uses a variety of techniques such as structural hashing, detection of intermediate functional equivalences, and circuit re-writing to first simplify the problem. We show that in spite of using these simplification techniques, a CEC engine can be modified to generate a single (extended) resolution proof for the whole miter just as in the naive case. The benefit of having a single proof is that the proof verification program remains extremely simple, and its correctness is much easier to establish than that of the CEC engine. |
Starting Page | 600 |
Ending Page | 605 |
Page Count | 6 |
File Format | |
ISBN | 9781595936271 |
ISSN | 0738100X |
DOI | 10.1145/1278480.1278631 |
Language | English |
Publisher | Association for Computing Machinery (ACM) |
Publisher Date | 2007-06-04 |
Publisher Place | New York |
Access Restriction | Subscribed |
Subject Keyword | Resolution proofs Equivalence checking Transformation-based verification |
Content Type | Text |
Resource Type | Article |
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