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adding simplex

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-02-11 20:42:17 -08:00
parent 8b5390c56f
commit 552b386a29
1 changed files with 52 additions and 19 deletions
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71
src/smt/theory_pb.cpp
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@ -202,23 +202,41 @@ namespace smt {
}
};
class reset_bound : public trail<context> {
class theory_pb::reset_bound : public trail<context> {
theory_pb& pb;
unsigned v;
bool is_lower;
public:
reset_bound(theory_pb& pb, unsigned v, bool is_lower):pb(pb), v(v), is_lower(is_lower) {}
reset_bound(theory_pb& pb, unsigned v, bool is_lower):
pb(pb), v(v), is_lower(is_lower) {}
virtual void undo(context& ctx) {
if (is_lower) {
pb.m_simplex.unset_lower(v);
}
else {
pb.m_simplex.unset_upper(v);
}
}
};
class undo_bound : public trail<context> {
class theory_pb::undo_bound : public trail<context> {
theory_pb& pb;
unsigned v;
bool is_lower;
public:
undo_bound(theory_pb& pb, unsigned v, bool is_lower):pb(pb), v(v), is_lower(is_lower) {}
undo_bound(theory_pb& pb, unsigned v, bool is_lower):
pb(pb), v(v), is_lower(is_lower) {}
virtual void undo(context& ctx) {
if (is_lower) {
mpq_inf zero(mpq(0),mpq(0));
pb.m_simplex.set_lower(v, zero);
}
else {
mpq_inf one(mpq(1),mpq(0));
pb.m_simplex.set_upper(v, one);
}
}
};
@ -336,9 +354,6 @@ namespace smt {
// in a nested way. So assume
//
//
// TBD: track and delete rows.
//
ineq rep(*c);
rep.remove_negations(); // normalize representative
numeral k = rep.k();
@ -569,6 +584,18 @@ namespace smt {
literal nlit(v, is_true);
TRACE("pb", tout << "assign: " << ~nlit << "\n";);
if (m_lwatch.find(nlit.index(), ineqs)) {
if (m_enable_simplex) {
if (is_true) {
mpq_inf one(mpq(1),mpq(0));
m_simplex.set_lower(v, one);
}
else {
mpq_inf zero(mpq(0),mpq(0));
m_simplex.set_upper(v, zero);
}
ctx.push_trail(undo_bound(*this, v, is_true));
}
for (unsigned i = 0; i < ineqs->size(); ++i) {
ineq* c = (*ineqs)[i];
SASSERT(c->is_ge());
@ -586,24 +613,30 @@ namespace smt {
}
ineq* c = 0;
if (m_ineqs.find(v, c)) {
if (m_enable_simplex) {
row_info const& info = m_ineq_row_info.find(v);
unsynch_mpq_inf_manager mgr;
_scoped_numeral<unsynch_mpq_inf_manager> coeff(mgr);
coeff = std::make_pair(info.m_bound.to_mpq(), mpq(0));
unsigned slack = info.m_slack;
if (is_true) {
m_simplex.set_lower(slack, coeff);
}
else {
mgr.sub(coeff, std::make_pair(mpq(1),mpq(0)), coeff);
m_simplex.set_upper(slack, coeff);
}
ctx.push_trail(reset_bound(*this, slack, is_true));
// m_simplex.feasible();
//
}
if (c->is_ge()) {
assign_ineq(*c, is_true);
}
else {
assign_eq(*c, is_true);
}
if (m_enable_simplex) {
row_info const& info = m_ineq_row_info.find(v);
if (is_true) {
// m_simplex.set_lower(info.m_slack, info.m_coeff);
// ctx.push_trail(reset_lower(info.m_slack));
}
else {
// m_simplex.set_upper(info.m_slack, info.m_coeff - 1);
// ctx.push_trail(reset_upper(info.m_slack));
}
// m_simplex.feasiable();
}
}
}