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fix unsoundness in quantifier propagation #6116 and add initial lemma logging

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This commit is contained in:
Nikolaj Bjorner 2022-08-23 19:09:50 -07:00
parent 912b284602
commit ce1f3987d9
15 changed files with 78 additions and 13 deletions
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7
src/sat/sat_solver.cpp
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@ -412,6 +412,7 @@ namespace sat {
clause * solver::mk_clause_core(unsigned num_lits, literal * lits, sat::status st) {
bool redundant = st.is_redundant();
TRACE("sat", tout << "mk_clause: " << mk_lits_pp(num_lits, lits) << (redundant?" learned":" aux") << "\n";);
bool logged = false;
if (!redundant || !st.is_sat()) {
unsigned old_sz = num_lits;
bool keep = simplify_clause(num_lits, lits);
@ -420,8 +421,10 @@ namespace sat {
return nullptr; // clause is equivalent to true.
}
// if an input clause is simplified, then log the simplified version as learned
if (m_config.m_drat && old_sz > num_lits)
if (m_config.m_drat && old_sz > num_lits) {
drat_log_clause(num_lits, lits, st);
logged = true;
}
++m_stats.m_non_learned_generation;
if (!m_searching) {
@ -435,7 +438,7 @@ namespace sat {
set_conflict();
return nullptr;
case 1:
if (m_config.m_drat && (!st.is_sat() || st.is_input()))
if (!logged && m_config.m_drat && (!st.is_sat() || st.is_input()))
drat_log_clause(num_lits, lits, st);
assign_unit(lits[0]);
return nullptr;