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