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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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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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* Preprocess equality rewriter for arithmetic |
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*/ |
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#include "theory/arith/pp_rewrite_eq.h" |
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#include "options/arith_options.h" |
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#include "theory/builtin/proof_checker.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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PreprocessRewriteEq::PreprocessRewriteEq(context::Context* c, |
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ProofNodeManager* pnm) |
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: d_ppPfGen(pnm, c, "Arith::ppRewrite"), d_pnm(pnm) |
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{ |
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} |
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TrustNode PreprocessRewriteEq::ppRewriteEq(TNode atom) |
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{ |
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Assert(atom.getKind() == kind::EQUAL); |
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if (!options::arithRewriteEq()) |
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{ |
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return TrustNode::null(); |
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} |
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Assert(atom[0].getType().isReal()); |
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Node leq = NodeBuilder(kind::LEQ) << atom[0] << atom[1]; |
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Node geq = NodeBuilder(kind::GEQ) << atom[0] << atom[1]; |
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Node rewritten = Rewriter::rewrite(leq.andNode(geq)); |
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Debug("arith::preprocess") |
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<< "arith::preprocess() : returning " << rewritten << std::endl; |
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// don't need to rewrite terms since rewritten is not a non-standard op |
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if (proofsEnabled()) |
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{ |
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Node t = builtin::BuiltinProofRuleChecker::mkTheoryIdNode(THEORY_ARITH); |
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return d_ppPfGen.mkTrustedRewrite( |
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atom, |
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rewritten, |
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d_pnm->mkNode( |
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PfRule::THEORY_INFERENCE, {}, {atom.eqNode(rewritten), t})); |
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} |
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return TrustNode::mkTrustRewrite(atom, rewritten, nullptr); |
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} |
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bool PreprocessRewriteEq::proofsEnabled() const { return d_pnm != nullptr; } |
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} // namespace arith |
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} // namespace theory |
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} // namespace cvc5 |