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/****************************************************************************** |
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* Top contributors (to current version): |
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* Yancheng Ou, Aina Niemetz |
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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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* The base class for optimizers of individual cvc5 type. |
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*/ |
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#include "omt/omt_optimizer.h" |
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#include "omt/bitvector_optimizer.h" |
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#include "omt/integer_optimizer.h" |
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using namespace cvc5::theory; |
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using namespace cvc5::smt; |
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namespace cvc5::omt { |
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bool OMTOptimizer::nodeSupportsOptimization(TNode node) |
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{ |
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TypeNode type = node.getType(); |
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// only supports Integer and BitVectors as of now |
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return (type.isInteger() || type.isBitVector()); |
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} |
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std::unique_ptr<OMTOptimizer> OMTOptimizer::getOptimizerForObjective( |
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const OptimizationObjective& objective) |
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{ |
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// the datatype of the target node |
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TypeNode objectiveType = objective.getTarget().getType(true); |
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if (objectiveType.isInteger()) |
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{ |
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// integer type: use OMTOptimizerInteger |
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return std::unique_ptr<OMTOptimizer>(new OMTOptimizerInteger()); |
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} |
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else if (objectiveType.isBitVector()) |
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{ |
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// bitvector type: use OMTOptimizerBitVector |
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return std::unique_ptr<OMTOptimizer>( |
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new OMTOptimizerBitVector(objective.bvIsSigned())); |
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} |
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else |
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{ |
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Unimplemented() << "Target type " << objectiveType |
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<< " does not support optimization"; |
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} |
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} |
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Node OMTOptimizer::mkStrongIncrementalExpression( |
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NodeManager* nm, |
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TNode lhs, |
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TNode rhs, |
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const OptimizationObjective& objective) |
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{ |
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constexpr const char lhsTypeError[] = |
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"lhs type does not match or is not implicitly convertable to the target " |
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"type"; |
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constexpr const char rhsTypeError[] = |
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"rhs type does not match or is not implicitly convertable to the target " |
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"type"; |
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TypeNode targetType = objective.getTarget().getType(); |
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switch (objective.getType()) |
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{ |
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case OptimizationObjective::MINIMIZE: |
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{ |
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if (targetType.isInteger()) |
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{ |
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Assert(lhs.getType().isInteger()) << lhsTypeError; |
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Assert(rhs.getType().isInteger()) << rhsTypeError; |
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return nm->mkNode(Kind::LT, lhs, rhs); |
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} |
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else if (targetType.isBitVector()) |
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{ |
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Assert(lhs.getType() == targetType) << lhsTypeError; |
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Assert(rhs.getType() == targetType) << rhsTypeError; |
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return (objective.bvIsSigned()) |
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? (nm->mkNode(Kind::BITVECTOR_SLT, lhs, rhs)) |
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: (nm->mkNode(Kind::BITVECTOR_ULT, lhs, rhs)); |
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} |
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else |
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{ |
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Unimplemented() << "Target type " << targetType |
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<< " does not support optimization"; |
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} |
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} |
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case OptimizationObjective::MAXIMIZE: |
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{ |
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if (targetType.isInteger()) |
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{ |
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Assert(lhs.getType().isInteger()) << lhsTypeError; |
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Assert(rhs.getType().isInteger()) << rhsTypeError; |
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return nm->mkNode(Kind::GT, lhs, rhs); |
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} |
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else if (targetType.isBitVector()) |
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{ |
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Assert(lhs.getType() == targetType) << lhsTypeError; |
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Assert(rhs.getType() == targetType) << rhsTypeError; |
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return (objective.bvIsSigned()) |
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? (nm->mkNode(Kind::BITVECTOR_SGT, lhs, rhs)) |
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: (nm->mkNode(Kind::BITVECTOR_UGT, lhs, rhs)); |
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} |
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else |
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{ |
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Unimplemented() << "Target type " << targetType |
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<< " does not support optimization"; |
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} |
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} |
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default: |
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CVC5_FATAL() << "Optimization objective is neither MAXIMIZE nor MINIMIZE"; |
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} |
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Unreachable(); |
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} |
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Node OMTOptimizer::mkWeakIncrementalExpression( |
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NodeManager* nm, |
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TNode lhs, |
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TNode rhs, |
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const OptimizationObjective& objective) |
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{ |
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constexpr const char lhsTypeError[] = |
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"lhs type does not match or is not implicitly convertable to the target " |
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"type"; |
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constexpr const char rhsTypeError[] = |
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"rhs type does not match or is not implicitly convertable to the target " |
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"type"; |
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TypeNode targetType = objective.getTarget().getType(); |
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switch (objective.getType()) |
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{ |
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case OptimizationObjective::MINIMIZE: |
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{ |
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if (targetType.isInteger()) |
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{ |
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Assert(lhs.getType().isInteger()) << lhsTypeError; |
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Assert(rhs.getType().isInteger()) << rhsTypeError; |
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return nm->mkNode(Kind::LEQ, lhs, rhs); |
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} |
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else if (targetType.isBitVector()) |
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{ |
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Assert(lhs.getType() == targetType) << lhsTypeError; |
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Assert(rhs.getType() == targetType) << rhsTypeError; |
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return (objective.bvIsSigned()) |
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? (nm->mkNode(Kind::BITVECTOR_SLE, lhs, rhs)) |
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: (nm->mkNode(Kind::BITVECTOR_ULE, lhs, rhs)); |
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} |
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else |
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{ |
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Unimplemented() << "Target type " << targetType |
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<< " does not support optimization"; |
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} |
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} |
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case OptimizationObjective::MAXIMIZE: |
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{ |
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if (targetType.isInteger()) |
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{ |
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Assert(lhs.getType().isInteger()) << lhsTypeError; |
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Assert(rhs.getType().isInteger()) << rhsTypeError; |
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return nm->mkNode(Kind::GEQ, lhs, rhs); |
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} |
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else if (targetType.isBitVector()) |
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{ |
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Assert(lhs.getType() == targetType) << lhsTypeError; |
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Assert(rhs.getType() == targetType) << rhsTypeError; |
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return (objective.bvIsSigned()) |
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? (nm->mkNode(Kind::BITVECTOR_SGE, lhs, rhs)) |
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: (nm->mkNode(Kind::BITVECTOR_UGE, lhs, rhs)); |
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} |
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else |
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{ |
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Unimplemented() << "Target type " << targetType |
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<< " does not support optimization"; |
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} |
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} |
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default: |
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CVC5_FATAL() << "Optimization objective is neither MAXIMIZE nor MINIMIZE"; |
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} |
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Unreachable(); |
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} |
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} // namespace cvc5::omt |