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fix bug in blocked clause elimination: it was ignoring unit literals

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-03-31 13:26:20 -07:00
parent aa2721517b
commit 55eb11d91b
5 changed files with 33 additions and 37 deletions
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6
src/sat/sat_simplifier.cpp
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@ -1007,7 +1007,7 @@ namespace sat {
}
bool process_var(bool_var v) {
return !s.s.is_assumption(v) && !s.was_eliminated(v) && !s.is_external(v);
return !s.s.is_assumption(v) && !s.was_eliminated(v) && !s.is_external(v) && s.value(v) == l_undef;
}
enum elim_type {
@ -1184,7 +1184,7 @@ namespace sat {
if (m_covered_antecedent[i] == clause_ante()) s.mark_visited(lit);
if (s.is_marked(lit)) idx = i;
}
if (_blocked.var() == 16774 && false) {
if (false && _blocked.var() == 16774) {
IF_VERBOSE(0, verbose_stream() << "covered: " << m_covered_clause << "\n";
verbose_stream() << "tautology: " << m_tautology << "\n";
verbose_stream() << "index: " << idx << "\n";
@ -1232,7 +1232,7 @@ namespace sat {
// unsigned sz0 = m_covered_clause.size();
m_covered_clause.resize(j);
VERIFY(j >= m_clause.size());
if (_blocked.var() == 16774 && false) {
if (false && _blocked.var() == 16774) {
IF_VERBOSE(0, verbose_stream() << "covered: " << m_covered_clause << "\n");
}
// IF_VERBOSE(0, verbose_stream() << "reduced from size " << sz0 << " to " << m_covered_clause << "\n" << m_clause << "\n";);