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