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update lower bounds from feasible solutiosn

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-07 22:09:57 -08:00
parent e307c5fdda
commit 370a4b66de
14 changed files with 123 additions and 44 deletions
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41
src/opt/optsmt.cpp
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@ -105,6 +105,13 @@ namespace opt {
return l_true;
}
void optsmt::update_lower(unsigned idx, rational const& r) {
inf_eps v(r);
if (m_lower[idx] < v) {
m_lower[idx] = v;
}
}
void optsmt::update_lower() {
model_ref md;
s->get_model(md);
@ -202,30 +209,26 @@ namespace opt {
Returns an optimal assignment to objective functions.
*/
lbool optsmt::operator()(opt_solver& solver) {
if (m_objs.empty()) {
return l_true;
}
lbool is_sat = l_true;
s = &solver;
s->reset_objectives();
solver.reset_objectives();
m_vars.reset();
// First check_sat call to initialize theories
lbool is_sat = s->check_sat(0, 0);
solver::scoped_push _push(*s);
if (is_sat == l_true && !m_objs.empty()) {
for (unsigned i = 0; i < m_objs.size(); ++i) {
m_vars.push_back(s->add_objective(m_objs[i].get()));
}
solver::scoped_push _push(solver);
if (m_engine == symbol("basic")) {
is_sat = basic_opt();
}
else if (m_engine == symbol("farkas")) {
is_sat = farkas_opt();
}
else {
// TODO: implement symba engine
// report error on bad configuration.
NOT_IMPLEMENTED_YET();
UNREACHABLE();
}
for (unsigned i = 0; i < m_objs.size(); ++i) {
m_vars.push_back(solver.add_objective(m_objs[i].get()));
}
if (m_engine == symbol("farkas")) {
is_sat = farkas_opt();
}
else {
is_sat = basic_opt();
}
IF_VERBOSE(1, verbose_stream() << "is-sat: " << is_sat << std::endl;