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simplify the check for polarity, remove the struct with vertex and polarity

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2021-04-09 12:32:12 -07:00
parent 8848e5b4c3
commit 6a1fd3b4d6
1 changed files with 8 additions and 18 deletions
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26
src/math/lp/lp_bound_propagator.h
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@ -101,15 +101,7 @@ class lp_bound_propagator {
map<mpq, const vertex*, obj_hash<mpq>, default_eq<mpq>> m_vals_to_verts_neg;
// x[m_root->column()] - m_pol[j].pol()*x[j] == const;
// to bind polarity and the vertex in the table
struct pol_vert {
int m_polarity;
const vertex* m_v;
pol_vert() {}
pol_vert(int p, const vertex* v): m_polarity(p), m_v(v) {}
int pol() const { return m_polarity; }
const vertex* v() const { return m_v; }
};
u_map<pol_vert> m_pol;
u_map<int> m_pol;
// if m_pos.contains(j) then x[j] = x[m_root->column()] + o
uint_set m_pos;
@ -260,32 +252,30 @@ public:
// pol for polarity
int pol(const vertex* v) const { return pol(v->column()); }
int pol(unsigned j) const { return m_pol[j].pol(); }
int pol(unsigned j) const { return m_pol[j]; }
void set_polarity(const vertex* v, int p) {
SASSERT(p == 1 || p == -1);
unsigned j = v->column();
SASSERT(!m_pol.contains(j));
m_pol.insert(j, pol_vert(p, v));
m_pol.insert(j, p);
}
void check_and_set_polarity(vertex* v, int polarity, unsigned row_index, vertex*v_parent) {
pol_vert prev_pol;
int prev_pol;
if (!m_pol.find(v->column(), prev_pol)) {
set_polarity(v, polarity);
return;
}
if (prev_pol.pol() == polarity)
if (prev_pol == polarity)
return;
const vertex *u = prev_pol.v();
// we have a path L between u and v with p(L) = -1, that means we can
// we have a path L between v and parent with p(L) = -1, that means we can
// create an equality of the form x + x = a, where x = v->column() = u->column()
vector<edge> path = connect_u_v_in_tree(u, v_parent);
vector<edge> path = connect_u_v_in_tree(v, v_parent);
m_fixed_vertex_explanation = get_explanation_from_path(path);
explain_fixed_in_row(row_index, m_fixed_vertex_explanation);
set_fixed_vertex(v);
TRACE("cheap_eq",
tout << "polarity switch: " << polarity << "\nv = "; print_vert(tout , v) << "\nu = "; print_vert(tout, u) << "\n";
tout << "fixed vertex explanation\n";
tout << "polarity switch: " << polarity << "\nv = "; print_vert(tout , v) << "\nu = "; tout << "fixed vertex explanation\n";
for (auto p : m_fixed_vertex_explanation)
lp().constraints().display(tout, [this](lpvar j) { return lp().get_variable_name(j);}, p.ci()););