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/******************************************************************************
* Top contributors (to current version):
* Mathias Preiner, Andrew Reynolds, Aina Niemetz
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* The BvAbstraction preprocessing pass.
*
* Abstract common structures over small domains to UF. This preprocessing
* is particularly useful on QF_BV/mcm benchmarks and can be enabled via
* option `--bv-abstraction`.
* For more information see 3.4 Refactoring Isomorphic Circuits in [1].
*
* [1] Liana Hadarean, An Efficient and Trustworthy Theory Solver for
* Bit-vectors in Satisfiability Modulo Theories
* https://cs.nyu.edu/media/publications/hadarean_liana.pdf
*/
#include "preprocessing/passes/bv_abstraction.h"
#include <vector>
#include "options/bv_options.h"
#include "preprocessing/assertion_pipeline.h"
#include "preprocessing/preprocessing_pass_context.h"
#include "theory/bv/theory_bv.h"
#include "theory/rewriter.h"
#include "theory/theory_engine.h"
namespace cvc5 {
namespace preprocessing {
namespace passes {
using namespace cvc5::theory;
BvAbstraction::BvAbstraction(PreprocessingPassContext* preprocContext)
: PreprocessingPass(preprocContext, "bv-abstraction"){};
PreprocessingPassResult BvAbstraction::applyInternal(
AssertionPipeline* assertionsToPreprocess)
{
std::vector<Node> new_assertions;
std::vector<Node> assertions(assertionsToPreprocess->begin(),
assertionsToPreprocess->end());
TheoryEngine* te = d_preprocContext->getTheoryEngine();
bv::TheoryBV* bv_theory = static_cast<bv::TheoryBV*>(te->theoryOf(THEORY_BV));
bv_theory->applyAbstraction(assertions, new_assertions);
for (unsigned i = 0, size = assertionsToPreprocess->size(); i < size; ++i)
{
assertionsToPreprocess->replace(i, Rewriter::rewrite(new_assertions[i]));
}
return PreprocessingPassResult::NO_CONFLICT;
}
} // namespace passes
} // namespace preprocessing
} // namespace cvc5
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