mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-04-08 18:31:49 +00:00
Code Activity

coordinate drat with clause removal

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-01-16 02:29:33 -08:00
parent b33f5f879e
commit e01a668da0
5 changed files with 82 additions and 83 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
src/sat/sat_elim_eqs.cpp
View file

@ -94,7 +94,7 @@ namespace sat {
void elim_eqs::drat_delete_clause() {
if (m_solver.m_config.m_drat) {
m_solver.m_drat.del(*m_to_delete->get());
m_solver.m_drat.del(*m_to_delete->get());
}
}
@ -172,7 +172,8 @@ namespace sat {
if (i < sz) {
drat_delete_clause();
m_solver.del_clause(c, false);
c.set_removed(true);
m_solver.del_clause(c);
continue;
}
@ -187,13 +188,15 @@ namespace sat {
return;
case 1:
m_solver.assign(c[0], justification());
m_solver.del_clause(c, false);
drat_delete_clause();
c.set_removed(true);
m_solver.del_clause(c);
break;
case 2:
m_solver.mk_bin_clause(c[0], c[1], c.is_learned());
m_solver.del_clause(c, false);
drat_delete_clause();
c.set_removed(true);
m_solver.del_clause(c);
break;
default:
SASSERT(*it == &c);

142
src/sat/sat_simplifier.cpp
View file

@ -124,24 +124,20 @@ namespace sat {
}
}
inline void simplifier::remove_clause_core(clause & c) {
for (literal l : c) {
insert_elim_todo(l.var());
}
m_sub_todo.erase(c);
c.set_removed(true);
TRACE("resolution_bug", tout << "del_clause: " << c << "\n";);
m_need_cleanup = true;
}
inline void simplifier::remove_clause(clause & c) {
remove_clause_core(c);
m_use_list.erase(c);
}
inline void simplifier::remove_clause(clause & c, literal l) {
remove_clause_core(c);
m_use_list.erase(c, l);
if (!c.was_removed()) {
if (s.m_config.m_drat) {
s.m_drat.del(c);
}
for (literal l : c) {
insert_elim_todo(l.var());
}
m_sub_todo.erase(c);
c.set_removed(true);
TRACE("resolution_bug", tout << "del_clause: " << c << "\n";);
m_need_cleanup = true;
m_use_list.erase(c);
}
}
inline void simplifier::set_learned(clause & c) {
@ -248,8 +244,8 @@ namespace sat {
cleanup_watches();
move_clauses(s.m_learned, true);
move_clauses(s.m_clauses, false);
cleanup_clauses(s.m_learned, true, vars_eliminated, m_learned_in_use_lists);
cleanup_clauses(s.m_clauses, false, vars_eliminated, true);
cleanup_clauses(s.m_learned, true, vars_eliminated);
cleanup_clauses(s.m_clauses, false, vars_eliminated);
}
CASSERT("sat_solver", s.check_invariant());
@ -305,7 +301,7 @@ namespace sat {
cs.set_end(it2);
}
void simplifier::cleanup_clauses(clause_vector & cs, bool learned, bool vars_eliminated, bool in_use_lists) {
void simplifier::cleanup_clauses(clause_vector & cs, bool learned, bool vars_eliminated) {
TRACE("sat", tout << "cleanup_clauses\n";);
clause_vector::iterator it = cs.begin();
clause_vector::iterator it2 = it;
@ -332,7 +328,7 @@ namespace sat {
}
unsigned sz0 = c.size();
if (cleanup_clause(c, in_use_lists)) {
if (cleanup_clause(c)) {
s.del_clause(c);
continue;
}
@ -347,14 +343,21 @@ namespace sat {
return;
case 1:
s.assign(c[0], justification());
s.del_clause(c, false);
c.restore(sz0);
s.del_clause(c);
break;
case 2:
s.mk_bin_clause(c[0], c[1], c.is_learned());
c.restore(sz0);
s.del_clause(c, true);
s.del_clause(c);
break;
default:
if (s.m_config.m_drat && sz0 != sz) {
s.m_drat.add(c, true);
c.restore(sz0);
s.m_drat.del(c);
c.shrink(sz);
}
*it2 = *it;
it2++;
if (!c.frozen()) {
@ -583,7 +586,7 @@ namespace sat {
Return true if the clause is satisfied
*/
bool simplifier::cleanup_clause(clause & c, bool in_use_list) {
bool simplifier::cleanup_clause(clause & c) {
bool r = false;
unsigned sz = c.size();
unsigned j = 0;
@ -598,11 +601,6 @@ namespace sat {
break;
case l_false:
m_need_cleanup = true;
if (in_use_list && !c.frozen()) {
// Remark: if in_use_list is false, then the given clause was not added to the use lists.
// Remark: frozen clauses are not added to the use lists.
m_use_list.get(l).erase_not_removed(c);
}
break;
case l_true:
r = true;
@ -615,9 +613,6 @@ namespace sat {
}
if (j < sz && !r) {
c.shrink(j);
if (s.m_config.m_drat) {
s.m_drat.add(c, true);
}
}
return r;
}
@ -666,7 +661,7 @@ namespace sat {
for (auto it = cs.mk_iterator(); !it.at_end(); ) {
clause & c = it.curr();
it.next();
remove_clause(c, l);
remove_clause(c);
}
cs.reset();
}
@ -689,31 +684,40 @@ namespace sat {
clause_use_list & occurs = m_use_list.get(l);
occurs.erase_not_removed(c);
m_sub_counter -= occurs.size()/2;
unsigned sz0 = c.size();
if (cleanup_clause(c, true /* clause is in the use lists */)) {
if (cleanup_clause(c)) {
// clause was satisfied
TRACE("elim_lit", tout << "clause was satisfied\n";);
remove_clause(c);
return;
}
switch (c.size()) {
unsigned sz = c.size();
switch (sz) {
case 0:
TRACE("elim_lit", tout << "clause is empty\n";);
s.set_conflict(justification());
break;
case 1:
TRACE("elim_lit", tout << "clause became unit: " << c[0] << "\n";);
c.restore(sz0);
propagate_unit(c[0]);
// propagate_unit will delete c.
// unit propagation removes c
break;
case 2:
TRACE("elim_lit", tout << "clause became binary: " << c[0] << " " << c[1] << "\n";);
c.restore(sz0);
s.mk_bin_clause(c[0], c[1], c.is_learned());
m_sub_bin_todo.push_back(bin_clause(c[0], c[1], c.is_learned()));
c.restore(sz0);
remove_clause(c);
break;
default:
if (s.m_config.m_drat && sz0 != sz) {
s.m_drat.add(c, true);
c.restore(sz0);
s.m_drat.del(c);
c.shrink(sz);
}
TRACE("elim_lit", tout << "result: " << c << "\n";);
m_sub_todo.insert(c);
break;
@ -882,7 +886,7 @@ namespace sat {
TRACE("subsumption", tout << "next: " << c << "\n";);
if (s.m_trail.size() > m_last_sub_trail_sz) {
unsigned sz0 = c.size();
if (cleanup_clause(c, true /* clause is in the use_lists */)) {
if (cleanup_clause(c)) {
remove_clause(c);
continue;
}
@ -892,9 +896,9 @@ namespace sat {
s.set_conflict(justification());
return;
case 1:
c.restore(sz0);
propagate_unit(c[0]);
// propagate_unit will delete c.
// remove_clause(c);
// unit propagation removes c
continue;
case 2:
TRACE("subsumption", tout << "clause became binary: " << c << "\n";);
@ -904,6 +908,12 @@ namespace sat {
remove_clause(c);
continue;
default:
if (s.m_config.m_drat && sz != sz0) {
s.m_drat.add(c, true);
c.restore(sz0);
s.m_drat.del(c);
c.shrink(sz);
}
break;
}
}
@ -1432,19 +1442,6 @@ namespace sat {
if (check_abce_tautology(m_covered_clause[i])) {
blocked = m_covered_clause[i];
reset_mark();
#if 0
if (sz0 == 3 && blocked.var() == 10219) {
IF_VERBOSE(0, verbose_stream() << "abce: " << m_covered_clause << "\n";
for (literal l : m_covered_clause) verbose_stream() << s.value(l) << "\n";
);
literal l = blocked;
clause_use_list & neg_occs = s.m_use_list.get(~l);
for (auto it = neg_occs.mk_iterator(); !it.at_end(); it.next()) {
clause & c = it.curr();
IF_VERBOSE(0, verbose_stream() << c << "\n");
}
}
#endif
m_covered_clause.shrink(sz0);
if (et == bce_t) return bce_t;
k = model_converter::ABCE;
@ -1895,17 +1892,13 @@ namespace sat {
for (auto & w : wlist) {
if (w.is_binary_clause()) {
literal l2 = w.get_literal();
// m_drat.del(l, l2);
watch_list & wlist2 = get_wlist(~l2);
watch_list::iterator it2 = wlist2.begin();
watch_list::iterator itprev = it2;
watch_list::iterator end2 = wlist2.end();
for (; it2 != end2; ++it2) {
if (it2->is_binary_clause() && it2->get_literal() == l) {
if ((l.var() == 2039 || l2.var() == 2039) &&
(l.var() == 27042 || l2.var() == 27042)) {
IF_VERBOSE(1, verbose_stream() << "remove_bin: " << l << " " << l2 << "\n");
}
TRACE("bin_clause_bug", tout << "removing: " << l << " " << it2->get_literal() << "\n";);
m_sub_bin_todo.erase(bin_clause(l2, l, it2->is_learned()));
continue;
@ -1929,11 +1922,16 @@ namespace sat {
clause & c = it.curr();
it.next();
SASSERT(c.contains(l));
c.set_removed(true);
m_use_list.erase(c, l);
m_sub_todo.erase(c);
TRACE("resolution_bug", tout << "del_clause (elim_var): " << c << "\n";);
m_need_cleanup = true;
if (!c.was_removed()) {
if (s.m_config.m_drat) {
s.m_drat.del(c);
}
c.set_removed(true);
m_use_list.erase(c, l);
m_sub_todo.erase(c);
TRACE("resolution_bug", tout << "del_clause (elim_var): " << c << "\n";);
m_need_cleanup = true;
}
}
}
@ -2019,14 +2017,7 @@ namespace sat {
model_converter::entry & mc_entry = s.m_mc.mk(model_converter::ELIM_VAR, v);
save_clauses(mc_entry, m_pos_cls);
save_clauses(mc_entry, m_neg_cls);
s.m_eliminated[v] = true;
remove_bin_clauses(pos_l);
remove_bin_clauses(neg_l);
remove_clauses(pos_occs, pos_l);
remove_clauses(neg_occs, neg_l);
pos_occs.reset();
neg_occs.reset();
s.m_eliminated[v] = true;
m_elim_counter -= num_pos * num_neg + before_lits;
for (auto & c1 : m_pos_cls) {
@ -2035,8 +2026,9 @@ namespace sat {
if (!resolve(c1, c2, pos_l, m_new_cls))
continue;
TRACE("resolution_new_cls", tout << c1 << "\n" << c2 << "\n-->\n" << m_new_cls << "\n";);
if (cleanup_clause(m_new_cls))
if (cleanup_clause(m_new_cls)) {
continue; // clause is already satisfied.
}
switch (m_new_cls.size()) {
case 0:
s.set_conflict(justification());
@ -2070,6 +2062,12 @@ namespace sat {
return true;
}
}
remove_bin_clauses(pos_l);
remove_bin_clauses(neg_l);
remove_clauses(pos_occs, pos_l);
remove_clauses(neg_occs, neg_l);
pos_occs.reset();
neg_occs.reset();
return true;
}

6
src/sat/sat_simplifier.h
View file

@ -133,9 +133,7 @@ namespace sat {
void register_clauses(clause_vector & cs);
void remove_clause_core(clause & c);
void remove_clause(clause & c);
void remove_clause(clause & c, literal l);
void set_learned(clause & c);
void set_learned(literal l1, literal l2);
@ -154,7 +152,7 @@ namespace sat {
void collect_subsumed0(clause const & c1, clause_vector & out);
void back_subsumption0(clause & c1);
bool cleanup_clause(clause & c, bool in_use_list);
bool cleanup_clause(clause & c);
bool cleanup_clause(literal_vector & c);
void elim_lit(clause & c, literal l);
void elim_dup_bins();
@ -164,7 +162,7 @@ namespace sat {
void cleanup_watches();
void move_clauses(clause_vector & cs, bool learned);
void cleanup_clauses(clause_vector & cs, bool learned, bool vars_eliminated, bool in_use_lists);
void cleanup_clauses(clause_vector & cs, bool learned, bool vars_eliminated);
bool is_external(bool_var v) const;
bool is_external(literal l) const { return is_external(l.var()); }

4
src/sat/sat_solver.cpp
View file

@ -303,14 +303,14 @@ namespace sat {
mk_clause(3, ls, learned);
}
void solver::del_clause(clause& c, bool enable_drat) {
void solver::del_clause(clause& c) {
if (!c.is_learned()) {
m_stats.m_non_learned_generation++;
}
if (c.frozen()) {
--m_num_frozen;
}
if (enable_drat && m_config.m_drat && !m_drat.is_cleaned(c)) {
if (!c.was_removed() && m_config.m_drat && !m_drat.is_cleaned(c)) {
m_drat.del(c);
}
dealloc_clause(&c);

2
src/sat/sat_solver.h
View file

@ -232,7 +232,7 @@ namespace sat {
void defrag_clauses();
bool should_defrag();
bool memory_pressure();
void del_clause(clause & c, bool enable_drat = true);
void del_clause(clause & c);
clause * mk_clause_core(unsigned num_lits, literal * lits, bool learned);
clause * mk_clause_core(literal_vector const& lits) { return mk_clause_core(lits.size(), lits.c_ptr()); }
clause * mk_clause_core(unsigned num_lits, literal * lits) { return mk_clause_core(num_lits, lits, false); }