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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/maxres.cpp
View file

@ -188,6 +188,7 @@ public:
}
lbool mus_solver() {
lbool is_sat = l_true;
init();
init_local();
trace();
@ -198,7 +199,7 @@ public:
tout << "\n";
display(tout);
);
lbool is_sat = check_sat_hill_climb(m_asms);
is_sat = check_sat_hill_climb(m_asms);
if (m_cancel) {
return l_undef;
}
@ -833,9 +834,7 @@ public:
s().assert_expr(m_asms[i].get());
}
}
else {
maxsmt_solver_base::commit_assignment();
}
// else: there is only a single assignment to these soft constraints.
}
void verify_core(exprs const& core) {

7
src/opt/maxsmt.cpp
View file

@ -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")) {