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merge with master

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-02-14 10:55:21 -08:00
parent cf86e6ef73
commit 762f265616
3 changed files with 23 additions and 8 deletions
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24
src/math/lp/lar_solver.cpp
View file

@ -172,7 +172,7 @@ void lar_solver::analyze_new_bounds_on_row_tableau(
return;
lp_assert(use_tableau());
bound_analyzer_on_row<row_strip<mpq>>::analyze_row(A_r().m_rows[row_index],
static_cast<unsigned>(-1),
null_ci,
zero_of_type<numeric_pair<mpq>>(),
row_index,
bp
@ -246,7 +246,7 @@ bool lar_solver::term_is_used_as_row(unsigned term) const {
void lar_solver::propagate_bounds_on_terms(lp_bound_propagator & bp) {
for (unsigned i = 0; i < m_terms.size(); i++) {
if (term_is_used_as_row(i + m_terms_start_index))
if (term_is_used_as_row(i))
continue; // this term is used a left side of a constraint,
// it was processed as a touched row if needed
propagate_bounds_on_a_term(*m_terms[i], bp, i);
@ -1118,7 +1118,7 @@ bool lar_solver::has_lower_bound(var_index var, constraint_index& ci, mpq& value
}
const ul_pair & ul = m_columns_to_ul_pairs[var];
ci = ul.lower_bound_witness();
if (ci != static_cast<constraint_index>(-1)) {
if (ci != null_ci) {
auto& p = m_mpq_lar_core_solver.m_r_lower_bounds()[var];
value = p.x;
is_strict = p.y.is_pos();
@ -1137,7 +1137,7 @@ bool lar_solver::has_upper_bound(var_index var, constraint_index& ci, mpq& value
}
const ul_pair & ul = m_columns_to_ul_pairs[var];
ci = ul.upper_bound_witness();
if (ci != static_cast<constraint_index>(-1)) {
if (ci != null_ci) {
auto& p = m_mpq_lar_core_solver.m_r_upper_bounds()[var];
value = p.x;
is_strict = p.y.is_neg();
@ -1363,7 +1363,7 @@ void lar_solver::pop() {
}
bool lar_solver::column_represents_row_in_tableau(unsigned j) {
return m_columns_to_ul_pairs()[j].m_i != static_cast<row_index>(-1);
return m_columns_to_ul_pairs()[j].m_i != UINT_MAX;
}
void lar_solver::make_sure_that_the_bottom_right_elem_not_zero_in_tableau(unsigned i, unsigned j) {
@ -1580,7 +1580,7 @@ var_index lar_solver::add_var(unsigned ext_j, bool is_int) {
return local_j;
lp_assert(m_columns_to_ul_pairs.size() == A_r().column_count());
local_j = A_r().column_count();
m_columns_to_ul_pairs.push_back(ul_pair(static_cast<unsigned>(-1)));
m_columns_to_ul_pairs.push_back(ul_pair(UINT_MAX));
add_non_basic_var_to_core_fields(ext_j, is_int);
lp_assert(sizes_are_correct());
return local_j;
@ -2330,6 +2330,18 @@ bool lar_solver::fetch_normalized_term_column(const lar_term& c, std::pair<mpq,
TRACE("lar_solver_terms", tout << "have not found\n";);
return false;
}
std::pair<constraint_index, constraint_index> lar_solver::add_equality(lpvar j, lpvar k) {
vector<std::pair<mpq, var_index>> coeffs;
coeffs.push_back(std::make_pair(mpq(1),j));
coeffs.push_back(std::make_pair(mpq(-1),k));
unsigned ext_term_index = m_terms.size();
unsigned term_index = add_term(coeffs, ext_term_index);
return std::pair<constraint_index, constraint_index>(
add_var_bound(term_index, lconstraint_kind::LE, mpq(0)),
add_var_bound(term_index, lconstraint_kind::GE, mpq(0)));
}
} // namespace lp

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

@ -47,6 +47,7 @@ namespace lp {
typedef unsigned lpvar;
const lpvar null_lpvar = UINT_MAX;
const constraint_index null_ci = UINT_MAX;
class lar_solver : public column_namer {
struct term_hasher {
@ -536,6 +537,8 @@ public:
return m_mpq_lar_core_solver.column_is_bounded(j);
}
std::pair<constraint_index, constraint_index> add_equality(lpvar j, lpvar k);
void get_bound_constraint_witnesses_for_column(unsigned j, constraint_index & lc, constraint_index & uc) const {
const ul_pair & ul = m_columns_to_ul_pairs[j];
lc = ul.lower_bound_witness();