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update empty cube case for sat/undef cases

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-10-01 20:22:02 -07:00
parent be8a9c611e
commit 9d0aa4d02d
4 changed files with 30 additions and 18 deletions
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25
src/sat/sat_solver/inc_sat_solver.cpp
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@ -308,6 +308,12 @@ public:
return nullptr;
}
expr_ref_vector last_cube() {
expr_ref_vector result(m);
result.push_back(m.mk_false());
return result;
}
expr_ref_vector cube(expr_ref_vector& vs, unsigned backtrack_level) override {
if (!is_internalized()) {
lbool r = internalize_formulas();
@ -326,15 +332,18 @@ public:
}
sat::literal_vector lits;
lbool result = m_solver.cube(vars, lits, backtrack_level);
if (result == l_false || lits.empty()) {
expr_ref_vector result(m);
result.push_back(m.mk_false());
return result;
}
if (result == l_true) {
IF_VERBOSE(1, verbose_stream() << "formulas are SAT\n");
switch (result) {
case l_true:
return expr_ref_vector(m);
}
case l_false:
return last_cube();
default:
SASSERT(!lits.empty());
if (lits.empty()) {
IF_VERBOSE(0, verbose_stream() << "empty cube for undef\n";);
}
break;
}
expr_ref_vector fmls(m);
expr_ref_vector lit2expr(m);
lit2expr.resize(m_solver.num_vars() * 2);