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fix #6400

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bi-implication was treated as an atomic formula leading to incorrect projection.
This commit is contained in:
Nikolaj Bjorner 2022-10-17 11:00:21 -07:00
parent 541aba308c
commit d4885abdc0
3 changed files with 24 additions and 23 deletions
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9
src/qe/qe_mbi.cpp
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@ -127,6 +127,7 @@ namespace qe {
mbi_result prop_mbi_plugin::operator()(expr_ref_vector& lits, model_ref& mdl) {
lbool r = m_solver->check_sat(lits);
TRACE("qe", tout << r << " " << lits << "\n");
switch (r) {
case l_false:
lits.reset();
@ -138,12 +139,10 @@ namespace qe {
for (unsigned i = 0, sz = mdl->get_num_constants(); i < sz; ++i) {
func_decl* c = mdl->get_constant(i);
if (is_shared(c)) {
if (m.is_true(mdl->get_const_interp(c))) {
if (m.is_true(mdl->get_const_interp(c)))
lits.push_back(m.mk_const(c));
}
else if (m.is_false(mdl->get_const_interp(c))) {
else if (m.is_false(mdl->get_const_interp(c)))
lits.push_back(m.mk_not(m.mk_const(c)));
}
}
}
return mbi_sat;
@ -172,7 +171,7 @@ namespace qe {
if (m_atom_set.contains(a)) {
// continue
}
else if (m.is_eq(a)) {
else if (m.is_eq(a) && !m.is_iff(a)) {
m_atoms.push_back(a);
m_atom_set.insert(a);
}