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Fix and and change some conditions.

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This commit is contained in:
chriseth 2022-03-21 10:34:53 +01:00
parent a3f999a13e
commit c34019f136
2 changed files with 11 additions and 8 deletions
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2
libsolutil/BooleanLP.cpp
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@ -172,6 +172,8 @@ void BooleanLPSolver::addAssertion(Expression const& _expr)
Literal l = negate(parseLiteralOrReturnEqualBoolean(_expr.arguments.at(0)));
state().clauses.emplace_back(Clause{vector<Literal>{l}});
}
else if (_expr.name == "implies")
addAssertion(!_expr.arguments.at(0) || _expr.arguments.at(1));
else if (_expr.name == "<=")
{
optional<LinearExpression> left = parseLinearSum(_expr.arguments.at(0));

17
libyul/optimiser/ReasoningBasedSimplifier.cpp
View File

@ -86,7 +86,7 @@ void ReasoningBasedSimplifier::operator()(If& _if)
cout << "Checking if condition can be true" << endl;
m_solver->push();
// TODO change this to >= 1 for simplicity?
m_solver->addAssertion(condition != constantValue(0));
m_solver->addAssertion(condition >= 1);
cout << " running check" << endl;
CheckResult result2 = m_solver->check({}).first;
m_solver->pop();
@ -105,7 +105,7 @@ void ReasoningBasedSimplifier::operator()(If& _if)
m_solver->push();
cout << "Setting condition true inside body" << endl;
m_solver->addAssertion(condition != constantValue(0));
m_solver->addAssertion(condition >= constantValue(1));
ASTModifier::operator()(_if.body);
@ -264,12 +264,13 @@ smtutil::Expression ReasoningBasedSimplifier::encodeEVMBuiltin(
case evmasm::Instruction::ISZERO:
return booleanValue(arguments.at(0) == constantValue(0));
case evmasm::Instruction::AND:
return smtutil::Expression::ite(
arguments.at(0) + arguments.at(1) <= 2,
booleanValue(arguments.at(0) + arguments.at(1) >= 2),
// TODO we could probably restrict it a bit more
newRestrictedVariable()
);
{
smtutil::Expression result = newRestrictedVariable();
m_solver->addAssertion(result <= arguments.at(0));
m_solver->addAssertion(result <= arguments.at(1));
// TODO can we say more?
return result;
}
case evmasm::Instruction::OR:
return smtutil::Expression::ite(
arguments.at(0) + arguments.at(1) <= 2,