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use appropriate MaxSAT solver even if there are no soft constraints. Also avoid PB constraints when all soft constraints are false. Reported by Klaus Becker

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-11-02 08:18:51 -08:00
parent b19fbe4429
commit 653416153d
2 changed files with 4 additions and 10 deletions
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7
src/opt/maxsmt.cpp
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@ -159,12 +159,7 @@ namespace opt {
symbol const& maxsat_engine = m_c.maxsat_engine();
IF_VERBOSE(1, verbose_stream() << "(maxsmt)\n";);
TRACE("opt", tout << "maxsmt\n";);
if (m_soft_constraints.empty()) {
TRACE("opt", tout << "no constraints\n";);
m_msolver = 0;
is_sat = s().check_sat(0, 0);
}
else if (maxsat_engine == symbol("maxres")) {
if (m_soft_constraints.empty() || maxsat_engine == symbol("maxres")) {
m_msolver = mk_maxres(m_c, m_weights, m_soft_constraints);
}
else if (maxsat_engine == symbol("pd-maxres")) {