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add comments and renaming

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2025-03-12 10:10:03 -10:00 • committed by Lev Nachmanson
parent a522e81652
commit f501aea3eb
3 changed files with 19 additions and 31 deletions
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18
src/math/lp/dioph_eq.cpp
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@ -484,7 +484,9 @@ namespace lp {
std::unordered_map<unsigned, std_vector<unsigned>> m_row2fresh_defs;
indexed_uint_set m_changed_rows;
indexed_uint_set m_new_fixed_columns;
// m_changed_columns are the columns that just became fixed, or those that just stopped being fixed.
// If such a column appears in an entry it has to be recalculated.
indexed_uint_set m_changed_columns;
indexed_uint_set m_changed_terms; // a term is defined by its column j, as in lar_solver.get_term(j)
indexed_uint_set m_tightened_columns; // the column that got tightened by the tigthening phase,
// m_column_to_terms[j] is the set of all k such lra.get_term(k) depends on j
@ -721,7 +723,7 @@ namespace lp {
void add_changed_column(unsigned j) {
TRACE("dio", lra.print_column_info(j, tout););
m_new_fixed_columns.insert(j);
m_changed_columns.insert(j);
}
std_vector<const lar_term*> m_added_terms;
std::unordered_set<const lar_term*> m_active_terms;
@ -751,7 +753,7 @@ namespace lp {
void update_column_bound_callback(unsigned j) {
if (!lra.column_is_int(j) || !lra.column_is_fixed(j))
return;
m_new_fixed_columns.insert(j);
m_changed_columns.insert(j);
auto undo = undo_fixed_column(*this, j);
lra.trail().push(undo);
}
@ -932,7 +934,7 @@ namespace lp {
}
void find_changed_terms_and_more_changed_rows() {
for (unsigned j : m_new_fixed_columns) {
for (unsigned j : m_changed_columns) {
const auto it = m_columns_to_terms.find(j);
if (it != m_columns_to_terms.end())
for (unsigned k : it->second) {
@ -1025,8 +1027,8 @@ namespace lp {
remove_irrelevant_fresh_defs();
eliminate_substituted_in_changed_rows();
m_new_fixed_columns.reset();
SASSERT(m_new_fixed_columns.size() == 0);
m_changed_columns.reset();
SASSERT(m_changed_columns.size() == 0);
m_changed_rows.reset();
SASSERT(entries_are_ok());
}
@ -1500,7 +1502,7 @@ namespace lp {
if (tighten_bounds_for_non_trivial_gcd(g, j, false) != lia_move::undef) {
return lia_move::conflict;
}
if (m_new_fixed_columns.contains(j)) {
if (m_changed_columns.contains(j)) {
return lia_move::continue_with_check;
}
return lia_move::undef;
@ -1743,7 +1745,7 @@ namespace lp {
if (r == lia_move::conflict || r == lia_move::undef) {
break;
}
SASSERT(m_new_fixed_columns.size() == 0);
SASSERT(m_changed_columns.size() == 0);
} while (f_vector.size());
if (r == lia_move::conflict) {