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fix a bug in the lar_solver::m_status update during push/pop

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Signed-off-by: Lev Nachmanson <levnach@microsoft.com>

progress in gomory cut

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>

the first version of Gomory cut, probably broken

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>

rename a function

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>

gomory cut worked on a toy example

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>

track the set of integer variables that are not set to integer values

Signed-off-by: Lev Nachmanson <levnach@microsoft.com>
This commit is contained in:
Lev Nachmanson 2017-07-10 16:34:23 -07:00 • committed by Lev Nachmanson
parent 0164ea9abb
commit aba7dcab3e
21 changed files with 682 additions and 455 deletions
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src/smt/theory_lra.cpp
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@ -107,6 +107,7 @@ namespace lp_api {
unsigned m_bound_propagations1;
unsigned m_bound_propagations2;
unsigned m_assert_diseq;
unsigned m_gomory_cuts;
stats() { reset(); }
void reset() {
memset(this, 0, sizeof(*this));
@ -1174,6 +1175,7 @@ namespace smt {
}
final_check_status final_check_eh() {
TRACE("lar_solver", tout << "ddd=" <<++lp::lp_settings::ddd << std::endl;);
m_use_nra_model = false;
lbool is_sat = l_true;
if (m_solver->get_status() != lp::lp_status::OPTIMAL) {
@ -1256,6 +1258,7 @@ namespace smt {
return l_false;
}
case lp::lia_move::cut: {
++m_stats.m_gomory_cuts;
// m_explanation implies term <= k
app_ref b = mk_bound(term, k);
m_eqs.reset();