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remove dead code

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This commit is contained in:
Lev Nachmanson 2023-07-06 15:07:26 -07:00
parent 1c907e8d09
commit 4e327babda
3 changed files with 1 additions and 73 deletions
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66
src/math/lp/lar_solver.cpp
View file

@ -1380,72 +1380,6 @@ namespace lp {
return m_mpq_lar_core_solver.column_is_free(j);
}
// column is at lower or upper bound, lower and upper bound are different.
// the lower/upper bound is not strict.
// the LP obtained by making the bound strict is infeasible
// -> the column has to be fixed
bool lar_solver::is_fixed_at_bound(column_index const& j, vector<std::tuple<explanation, column_index, bool, mpq>>& bounds) {
if (column_is_fixed(j))
return false;
mpq val;
if (!has_value(j, val))
return false;
lp::lconstraint_kind k;
if (column_has_upper_bound(j) &&
get_upper_bound(j).x == val) {
push();
k = column_is_int(j) ? LE : LT;
auto ci = mk_var_bound(j, k, column_is_int(j) ? val - 1 : val);
update_column_type_and_bound(j, k, column_is_int(j) ? val - 1 : val, ci);
auto st = find_feasible_solution();
bool infeasible = st == lp_status::INFEASIBLE;
if (infeasible) {
explanation exp;
get_infeasibility_explanation(exp);
unsigned_vector cis;
exp.remove(ci);
verbose_stream() << "tight upper bound " << j << " " << val << "\n";
bounds.push_back({exp, j, true, val});
}
pop(1);
return infeasible;
}
if (column_has_lower_bound(j) &&
get_lower_bound(j).x == val) {
push();
k = column_is_int(j) ? GE : GT;
auto ci = mk_var_bound(j, k, column_is_int(j) ? val + 1 : val);
update_column_type_and_bound(j, k, column_is_int(j) ? val + 1 : val, ci);
auto st = find_feasible_solution();
bool infeasible = st == lp_status::INFEASIBLE;
if (infeasible) {
explanation exp;
get_infeasibility_explanation(exp);
exp.remove(ci);
verbose_stream() << "tight lower bound " << j << " " << val << "\n";
bounds.push_back({exp, j, false, val});
}
pop(1);
return infeasible;
}
return false;
}
bool lar_solver::has_fixed_at_bound(vector<std::tuple<explanation, column_index, bool, mpq>>& bounds) {
verbose_stream() << "has-fixed-at-bound\n";
for (unsigned j = 0; j < A_r().m_columns.size(); ++j) {
auto ci = column_index(j);
if (is_fixed_at_bound(ci, bounds))
verbose_stream() << "fixed " << j << "\n";
}
verbose_stream() << "num fixed " << bounds.size() << "\n";
if (!bounds.empty())
find_feasible_solution();
return !bounds.empty();
}
// below is the initialization functionality of lar_solver
bool lar_solver::strategy_is_undecided() const {

3
src/math/lp/lar_solver.h
View file

@ -364,9 +364,6 @@ class lar_solver : public column_namer {
}
}
bool is_fixed_at_bound(column_index const& j, vector<std::tuple<explanation, column_index, bool, mpq>>& bounds);
bool has_fixed_at_bound(vector<std::tuple<explanation, column_index, bool, mpq>>& bounds);
bool is_fixed(column_index const& j) const { return column_is_fixed(j); }
inline column_index to_column_index(unsigned v) const { return column_index(external_to_column_index(v)); }
bool external_is_used(unsigned) const;

5
src/smt/theory_lra.cpp
View file

@ -1659,10 +1659,7 @@ public:
unsigned old_idx = m_final_check_idx;
switch (is_sat) {
case l_true:
TRACE("arith", display(tout));
// if (lp().has_fixed_at_bound()) // explain and propagate.
TRACE("arith", display(tout));
#if 0
m_dist.reset();
m_dist.push(0, 1);