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Fix unsound handling of upper bounds in wmax, thanks to Patrick Trentin for report and careful repros #847

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-01-15 11:52:48 -08:00
parent bc6b3007de
commit 7df803c131
5 changed files with 44 additions and 47 deletions
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8
src/opt/wmax.cpp
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@ -62,20 +62,21 @@ namespace opt {
}
m_upper = m_lower;
bool was_sat = false;
expr_ref_vector disj(m), asms(m);
expr_ref_vector asms(m);
vector<expr_ref_vector> cores;
obj_map<expr, rational>::iterator it = soft.begin(), end = soft.end();
for (; it != end; ++it) {
expr* c = assert_weighted(wth(), it->m_key, it->m_value);
if (!is_true(it->m_key)) {
disj.push_back(m.mk_not(c));
m_upper += it->m_value;
}
}
wth().init_min_cost(m_upper - m_lower);
s().assert_expr(mk_or(disj));
trace_bounds("wmax");
TRACE("opt",
s().display(tout); tout << "\n";
tout << "lower: " << m_lower << " upper: " << m_upper << "\n";);
while (!m.canceled() && m_lower < m_upper) {
//mk_assumptions(asms);
//is_sat = s().preferred_sat(asms, cores);
@ -84,6 +85,7 @@ namespace opt {
is_sat = l_undef;
}
if (is_sat == l_false) {
TRACE("opt", tout << "Unsat\n";);
break;
}
if (is_sat == l_true) {