mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-06-06 14:13:23 +00:00
Code Activity

enabling upper bound test

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-10-31 09:43:15 -07:00
parent 637b63cbe1
commit 72e82532b2
9 changed files with 82 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

63
src/opt/optimize_objectives.cpp
View file

@ -66,24 +66,16 @@ namespace opt {
*/
lbool optimize_objectives::basic_opt(app_ref_vector& objectives) {
arith_util autil(m);
s->reset_objectives();
m_lower.reset();
m_upper.reset();
// First check_sat call to initialize theories
lbool is_sat = s->check_sat(0, 0);
if (is_sat != l_true) {
return is_sat;
}
opt_solver::scoped_push _push(*s);
opt_solver::toggle_objective _t(*s, true);
for (unsigned i = 0; i < objectives.size(); ++i) {
s->add_objective(objectives[i].get());
m_lower.push_back(inf_eps(rational(-1),inf_rational(0)));
m_upper.push_back(inf_eps(rational(1), inf_rational(0)));
m_vars.push_back(s->add_objective(objectives[i].get()));
}
lbool is_sat = l_true;
// ready to test: is_sat = update_upper();
while (is_sat == l_true && !m_cancel) {
is_sat = update_lower();
}
@ -117,8 +109,31 @@ namespace opt {
}
lbool optimize_objectives::update_upper() {
NOT_IMPLEMENTED_YET();
return l_undef;
smt::theory_opt& opt = s->get_optimizer();
if (typeid(smt::theory_inf_arith) != typeid(opt)) {
return l_true;
}
smt::theory_inf_arith& th = dynamic_cast<smt::theory_inf_arith&>(opt);
expr_ref bound(m);
lbool is_sat = l_true;
for (unsigned i = 0; i < m_lower.size(); ++i) {
if (m_lower[i] < m_upper[i]) {
opt_solver::scoped_push _push(*s);
smt::theory_var v = m_vars[i];
bound = th.block_upper_bound(v, m_upper[i]);
expr* bounds[1] = { bound };
is_sat = s->check_sat(1, bounds);
if (is_sat) {
IF_VERBOSE(1, verbose_stream() << "Setting lower bound for " << v << " to " << m_upper[i] << "\n";);
m_lower[i] = m_upper[i];
}
// else: TBD extract Farkas coefficients.
}
}
return l_true;
}
/**
@ -127,10 +142,22 @@ namespace opt {
*/
lbool optimize_objectives::operator()(opt_solver& solver, app_ref_vector& objectives, vector<inf_eps>& values) {
s = &solver;
lbool result = basic_opt(objectives);
values.reset();
values.append(m_lower);
return result;
s->reset_objectives();
m_lower.reset();
m_upper.reset();
for (unsigned i = 0; i < objectives.size(); ++i) {
m_lower.push_back(inf_eps(rational(-1),inf_rational(0)));
m_upper.push_back(inf_eps(rational(1), inf_rational(0)));
}
// First check_sat call to initialize theories
lbool is_sat = s->check_sat(0, 0);
if (is_sat == l_true) {
is_sat = basic_opt(objectives);
values.reset();
values.append(m_lower);
}
return is_sat;
}
}