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/****************************************************************************** |
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* Top contributors (to current version): |
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* Gereon Kremer |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Implementation of split zero check. |
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*/ |
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#include "theory/arith/nl/ext/split_zero_check.h" |
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#include "expr/node.h" |
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#include "proof/proof.h" |
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#include "theory/arith/arith_msum.h" |
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#include "theory/arith/inference_manager.h" |
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#include "theory/arith/nl/ext/ext_state.h" |
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#include "theory/arith/nl/nl_model.h" |
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#include "theory/rewriter.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace arith { |
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namespace nl { |
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SplitZeroCheck::SplitZeroCheck(ExtState* data) |
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: d_data(data), d_zero_split(d_data->d_ctx) |
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{ |
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} |
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void SplitZeroCheck::check() |
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{ |
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for (unsigned i = 0; i < d_data->d_ms_vars.size(); i++) |
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{ |
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Node v = d_data->d_ms_vars[i]; |
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if (d_zero_split.insert(v)) |
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{ |
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Node eq = Rewriter::rewrite(v.eqNode(d_data->d_zero)); |
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Node lem = eq.orNode(eq.negate()); |
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CDProof* proof = nullptr; |
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if (d_data->isProofEnabled()) |
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{ |
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proof = d_data->getProof(); |
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proof->addStep(lem, PfRule::SPLIT, {}, {eq}); |
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} |
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d_data->d_im.addPendingPhaseRequirement(eq, true); |
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d_data->d_im.addPendingLemma( |
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lem, InferenceId::ARITH_NL_SPLIT_ZERO, proof); |
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} |
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} |
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} |
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} // namespace nl |
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} // namespace arith |
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} // namespace theory |
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} // namespace cvc5 |