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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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* Implementation of utility for minimizing the number of calls to |
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* evaluate a term on substitutions with a fixed domain. |
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*/ |
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#include "theory/quantifiers/sygus/example_min_eval.h" |
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#include "expr/node_algorithm.h" |
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#include "theory/quantifiers/sygus/term_database_sygus.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace quantifiers { |
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ExampleMinEval::ExampleMinEval(Node n, |
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const std::vector<Node>& vars, |
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EmeEval* ece) |
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{ |
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AlwaysAssert(d_evalNode.isNull()); |
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d_evalNode = n; |
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d_vars.insert(d_vars.end(), vars.begin(), vars.end()); |
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// compute its free variables |
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std::unordered_set<Node> fvs; |
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expr::getFreeVariables(n, fvs); |
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for (size_t i = 0, vsize = vars.size(); i < vsize; i++) |
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{ |
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if (fvs.find(vars[i]) != fvs.end()) |
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{ |
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// will use this index |
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d_indices.push_back(i); |
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} |
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} |
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Trace("example-cache") << "For " << n << ", " << d_indices.size() << " / " |
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<< d_vars.size() << " variables are relevant" |
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<< std::endl; |
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d_ece = ece; |
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} |
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Node ExampleMinEval::evaluate(const std::vector<Node>& subs) |
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{ |
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Assert(d_vars.size() == subs.size()); |
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if (d_indices.size() == d_vars.size()) |
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{ |
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// no sharing is possible since all variables are relevant, just evaluate |
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return d_ece->eval(d_evalNode, d_vars, subs); |
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} |
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// get the subsequence of subs that is relevant |
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std::vector<Node> relSubs; |
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for (unsigned i = 0, ssize = d_indices.size(); i < ssize; i++) |
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{ |
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relSubs.push_back(subs[d_indices[i]]); |
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} |
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Node res = d_trie.existsTerm(relSubs); |
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if (res.isNull()) |
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{ |
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// not already cached, must evaluate |
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res = d_ece->eval(d_evalNode, d_vars, subs); |
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// add to trie |
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d_trie.addTerm(res, relSubs); |
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} |
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return res; |
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} |
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Node EmeEvalTds::eval(TNode n, |
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const std::vector<Node>& args, |
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const std::vector<Node>& vals) |
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{ |
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return d_tds->evaluateBuiltin(d_tn, n, vals); |
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} |
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} // namespace quantifiers |
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} // namespace theory |
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} // namespace cvc5 |