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fix #4931

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-01-08 12:02:53 -08:00
parent c36355c1e5
commit e902e1ef13
1 changed files with 8 additions and 1 deletions
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9
src/sat/smt/ba_pb.cpp
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@ -61,13 +61,18 @@ namespace ba {
void pb::negate() {
m_lit.neg();
unsigned w = 0;
unsigned w = 0, m = 0;
for (unsigned i = 0; i < m_size; ++i) {
m_wlits[i].second.neg();
VERIFY(w + m_wlits[i].first >= w);
w += m_wlits[i].first;
m = std::max(m, m_wlits[i].first);
}
m_k = w - m_k + 1;
if (m > m_k)
for (unsigned i = 0; i < m_size; ++i)
m_wlits[i].first = std::min(m_k, m_wlits[i].first);
VERIFY(w >= m_k && m_k > 0);
}
@ -121,6 +126,7 @@ namespace ba {
// watch a prefix of literals, such that the slack of these is >= k
bool pb::init_watch(solver_interface& s) {
SASSERT(well_formed());
auto& p = *this;
clear_watch(s);
if (lit() != sat::null_literal && s.value(p.lit()) == l_false) {
@ -178,6 +184,7 @@ namespace ba {
TRACE("ba", display(tout << "init watch: ", s, true););
// slack is tight:
if (slack + slack1 == bound) {
SASSERT(slack1 == 0);