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bug fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-10-08 14:35:31 -07:00
parent 356835533a
commit 10e4235b4c
4 changed files with 72 additions and 72 deletions
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56
src/sat/sat_elim_eqs.cpp
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@ -101,12 +101,13 @@ namespace sat {
c[i] = norm(roots, c[i]);
}
std::sort(c.begin(), c.end());
for (literal l : c) VERIFY(l == norm(roots, l));
TRACE("sats", tout << "after normalization/sorting: " << c << "\n"; tout.flush(););
DEBUG_CODE({
for (unsigned i = 0; i < sz; i++) {
CTRACE("sats", c[i] != norm(roots, c[i]), tout << c[i] << " " << norm(roots, c[i]) << "\n"; tout.flush(););
SASSERT(c[i] == norm(roots, c[i]));
} });
for (literal l : c) {
CTRACE("sat", l != norm(roots, l), tout << l << " " << norm(roots, l) << "\n"; tout.flush(););
SASSERT(l == norm(roots, l));
} });
// remove duplicates, and check if it is a tautology
literal l_prev = null_literal;
unsigned j = 0;
@ -122,13 +123,11 @@ namespace sat {
break; // clause was satisfied
if (val == l_false)
continue; // skip
if (i != j) {
std::swap(c[i], c[j]);
}
c[j] = l;
j++;
}
if (i < sz) {
// clause is a tautology or was simplified
// clause is a tautology or was simplified to true
m_solver.del_clause(c);
continue;
}
@ -164,10 +163,7 @@ namespace sat {
else
c.update_approx();
DEBUG_CODE({
for (unsigned i = 0; i < j; i++) {
SASSERT(c[i] == norm(roots, c[i]));
} });
DEBUG_CODE(for (literal l : c) VERIFY(l == norm(roots, l)););
*it2 = *it;
it2++;
@ -187,7 +183,6 @@ namespace sat {
literal r = roots[v];
SASSERT(v != r.var());
if (m_solver.is_external(v) && !m_solver.set_root(l, r)) {
std::cout << "skip: " << l << " == " << r << "\n";
// cannot really eliminate v, since we have to notify extension of future assignments
m_solver.mk_bin_clause(~l, r, false);
m_solver.mk_bin_clause(l, ~r, false);
@ -199,29 +194,33 @@ namespace sat {
mc.insert(e, ~l, r);
mc.insert(e, l, ~r);
}
m_solver.flush_roots();
}
m_solver.flush_roots();
}
bool elim_eqs::check_clauses(literal_vector const & roots) const {
clause_vector * vs[2] = { &m_solver.m_clauses, &m_solver.m_learned };
for (unsigned i = 0; i < 2; i++) {
clause_vector & cs = *(vs[i]);
clause_vector::iterator it = cs.begin();
clause_vector::iterator end = cs.end();
for (; it != end; ++it) {
clause & c = *(*it);
unsigned sz = c.size();
for (unsigned i = 0; i < sz; i++) {
CTRACE("elim_eqs_bug", m_solver.was_eliminated(c[i].var()), tout << "lit: " << c[i] << " " << norm(roots, c[i]) << "\n";
tout << c << "\n";);
SASSERT(!m_solver.was_eliminated(c[i].var()));
}
bool elim_eqs::check_clause(clause const& c, literal_vector const& roots) const {
for (literal l : c) {
CTRACE("elim_eqs_bug", m_solver.was_eliminated(l.var()), tout << "lit: " << l << " " << norm(roots, l) << "\n";
tout << c << "\n";);
if (m_solver.was_eliminated(l.var())) {
IF_VERBOSE(0, verbose_stream() << c << " contains eliminated literal " << l << " " << norm(roots, l) << "\n";);
UNREACHABLE();
}
}
return true;
}
bool elim_eqs::check_clauses(literal_vector const & roots) const {
for (clause * cp : m_solver.m_clauses)
if (!check_clause(*cp, roots))
return false;
for (clause * cp : m_solver.m_learned)
if (!check_clause(*cp, roots))
return false;
return true;
}
void elim_eqs::operator()(literal_vector const & roots, bool_var_vector const & to_elim) {
cleanup_bin_watches(roots);
TRACE("elim_eqs", tout << "after bin cleanup\n"; m_solver.display(tout););
@ -230,6 +229,7 @@ namespace sat {
cleanup_clauses(roots, m_solver.m_learned);
if (m_solver.inconsistent()) return;
save_elim(roots, to_elim);
VERIFY(check_clauses(roots));
m_solver.propagate(false);
SASSERT(check_clauses(roots));
}