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fix transitive reduction bug, eliminate blocked tag on binary clauses, separate BIG structure from scc

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-12-13 02:38:06 -08:00
commit 71c52396cb
26 changed files with 572 additions and 355 deletions
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105
src/sat/sat_integrity_checker.cpp
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@ -34,13 +34,11 @@ namespace sat {
// for nary clauses
static bool contains_watched(watch_list const & wlist, clause const & c, clause_offset cls_off) {
watch_list::const_iterator it = wlist.begin();
watch_list::const_iterator end = wlist.end();
for (; it != end; ++it) {
if (it->is_clause()) {
if (it->get_clause_offset() == cls_off) {
for (watched const& w : wlist) {
if (w.is_clause()) {
if (w.get_clause_offset() == cls_off) {
// the blocked literal must be in the clause.
SASSERT(c.contains(it->get_blocked_literal()));
SASSERT(c.contains(w.get_blocked_literal()));
return true;
}
}
@ -96,13 +94,13 @@ namespace sat {
}
// the first two literals must be watched.
VERIFY(contains_watched(s.get_wlist(~c[0]), c, s.get_offset(c)));
VERIFY(contains_watched(s.get_wlist(~c[0]), c, s.get_offset(c)));
VERIFY(contains_watched(s.get_wlist(~c[1]), c, s.get_offset(c)));
}
return true;
}
bool integrity_checker::check_clauses(clause * const * begin, clause * const * end) const {
bool integrity_checker::check_clauses(clause * const * begin, clause * const * end) const {
for (clause * const * it = begin; it != end; ++it) {
SASSERT(check_clause(*(*it)));
}
@ -152,49 +150,54 @@ namespace sat {
return true;
}
bool integrity_checker::check_watches(literal l) const {
return check_watches(l, s.get_wlist(~l));
}
bool integrity_checker::check_watches(literal l, watch_list const& wlist) const {
for (watched const& w : wlist) {
switch (w.get_kind()) {
case watched::BINARY:
SASSERT(!s.was_eliminated(w.get_literal().var()));
CTRACE("sat_watched_bug", !s.get_wlist(~(w.get_literal())).contains(watched(l, w.is_learned())),
tout << "l: " << l << " l2: " << w.get_literal() << "\n";
tout << "was_eliminated1: " << s.was_eliminated(l.var());
tout << " was_eliminated2: " << s.was_eliminated(w.get_literal().var());
tout << " learned: " << w.is_learned() << "\n";
sat::display_watch_list(tout, s.m_cls_allocator, wlist);
tout << "\n";
sat::display_watch_list(tout, s.m_cls_allocator, s.get_wlist(~(w.get_literal())));
tout << "\n";);
VERIFY(find_binary_watch(s.get_wlist(~(w.get_literal())), l));
break;
case watched::TERNARY:
VERIFY(!s.was_eliminated(w.get_literal1().var()));
VERIFY(!s.was_eliminated(w.get_literal2().var()));
VERIFY(w.get_literal1().index() < w.get_literal2().index());
break;
case watched::CLAUSE:
SASSERT(!s.m_cls_allocator.get_clause(w.get_clause_offset())->was_removed());
break;
default:
break;
}
}
return true;
}
bool integrity_checker::check_watches() const {
DEBUG_CODE(
vector<watch_list>::const_iterator it = s.m_watches.begin();
vector<watch_list>::const_iterator end = s.m_watches.end();
for (unsigned l_idx = 0; it != end; ++it, ++l_idx) {
literal l = ~to_literal(l_idx);
watch_list const & wlist = *it;
unsigned l_idx = 0;
for (watch_list const& wlist : s.m_watches) {
literal l = ~to_literal(l_idx++);
CTRACE("sat_bug",
s.was_eliminated(l.var()) && !wlist.empty(),
tout << "l: " << l << "\n";
s.display_watches(tout);
s.display(tout););
SASSERT(!s.was_eliminated(l.var()) || wlist.empty());
watch_list::const_iterator it2 = wlist.begin();
watch_list::const_iterator end2 = wlist.end();
for (; it2 != end2; ++it2) {
switch (it2->get_kind()) {
case watched::BINARY:
SASSERT(!s.was_eliminated(it2->get_literal().var()));
CTRACE("sat_watched_bug", !s.get_wlist(~(it2->get_literal())).contains(watched(l, it2->is_learned())),
tout << "l: " << l << " l2: " << it2->get_literal() << "\n";
tout << "was_eliminated1: " << s.was_eliminated(l.var());
tout << " was_eliminated2: " << s.was_eliminated(it2->get_literal().var());
tout << " learned: " << it2->is_learned() << "\n";
sat::display_watch_list(tout, s.m_cls_allocator, wlist);
tout << "\n";
sat::display_watch_list(tout, s.m_cls_allocator, s.get_wlist(~(it2->get_literal())));
tout << "\n";);
SASSERT(s.get_wlist(~(it2->get_literal())).contains(watched(l, it2->is_learned())));
break;
case watched::TERNARY:
SASSERT(!s.was_eliminated(it2->get_literal1().var()));
SASSERT(!s.was_eliminated(it2->get_literal2().var()));
SASSERT(it2->get_literal1().index() < it2->get_literal2().index());
break;
case watched::CLAUSE:
SASSERT(!s.m_cls_allocator.get_clause(it2->get_clause_offset())->was_removed());
break;
default:
break;
}
}
});
if (!check_watches(l, wlist))
return false;
}
return true;
}
@ -211,16 +214,12 @@ namespace sat {
bool integrity_checker::check_disjoint_clauses() const {
uint_set ids;
clause_vector::const_iterator it = s.m_clauses.begin();
clause_vector::const_iterator end = s.m_clauses.end();
for (; it != end; ++it) {
ids.insert((*it)->id());
for (clause* cp : s.m_clauses) {
ids.insert(cp->id());
}
it = s.m_learned.begin();
end = s.m_learned.end();
for (; it != end; ++it) {
if (ids.contains((*it)->id())) {
TRACE("sat", tout << "Repeated clause: " << (*it)->id() << "\n";);
for (clause* cp : s.m_learned) {
if (ids.contains(cp->id())) {
TRACE("sat", tout << "Repeated clause: " << cp->id() << "\n";);
return false;
}
}