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Fix interior multi-or and multi-and.

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This commit is contained in:
chriseth 2022-05-31 14:21:13 +02:00
parent 02c6298ab8
commit 57c6c529d0
1 changed files with 20 additions and 13 deletions
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33
libsolutil/BooleanLP.cpp
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@ -312,11 +312,16 @@ void BooleanLPSolver::addAssertion(Expression const& _expr, LetBindings _letBind
addAssertion(arg, _letBindings);
else if (_expr.name == "or")
{
vector<Literal> literals;
// We could try to parse a full clause here instead.
for (auto const& arg: _expr.arguments)
literals.emplace_back(parseLiteralOrReturnEqualBoolean(arg, _letBindings));
state().clauses.emplace_back(Clause{move(literals)});
if (_expr.arguments.size() == 1)
addAssertion(_expr.arguments.front());
else
{
vector<Literal> literals;
// We could try to parse a full clause here instead.
for (auto const& arg: _expr.arguments)
literals.emplace_back(parseLiteralOrReturnEqualBoolean(arg, _letBindings));
state().clauses.emplace_back(Clause{move(literals)});
}
}
else if (_expr.name == "xor")
{
@ -748,15 +753,17 @@ void BooleanLPSolver::addBooleanEquality(Literal const& _left, smtutil::Expressi
else
{
Literal a = parseLiteralOrReturnEqualBoolean(_right.arguments.at(0), _letBindings);
Literal b = parseLiteralOrReturnEqualBoolean(_right.arguments.at(1), _letBindings);
/*
if (isConditionalConstraint(a.variable) && isConditionalConstraint(b.variable))
Literal b;
if (_right.arguments.size() > 2)
{
// We cannot have more than one constraint per clause.
// TODO Why?
b = *parseLiteral(declareInternalVariable(true));
addBooleanEquality(b, _right.arguments.at(1));
}*/
solAssert(_right.name == "and" || _right.name == "or");
// Reduce "a and b and c and ..." to "a and (b and c and ...)"
smtutil::Expression rightSuffix = _right;
rightSuffix.arguments.erase(rightSuffix.arguments.begin());
b = parseLiteralOrReturnEqualBoolean(rightSuffix, _letBindings);
}
else
b = parseLiteralOrReturnEqualBoolean(_right.arguments.at(1), _letBindings);
if (_right.name == "and")
{