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fix latent sign bug

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This commit is contained in:
Nikolaj Bjorner 2025-04-23 17:22:57 -07:00
parent fe1fff3b7e
commit 792ffeeda7
1 changed files with 4 additions and 3 deletions
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7
src/math/lp/lar_solver.cpp
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@ -1183,7 +1183,8 @@ namespace lp {
slack += coeff * (adj_sign < 0 ? get_upper_bound(j) : get_lower_bound(j));
}
bool is_pos = slack.is_pos();
#define get_sign(_x_) (_x_.is_pos() ? 1 : (_x_.is_neg() ? -1 : 0))
int sign = get_sign(slack);
#endif
for (auto& [coeff, j] : inf_row) {
@ -1199,7 +1200,7 @@ namespace lp {
if (ul.previous_upper() != UINT_MAX) {
auto const& [_is_upper, _j, _bound, _column] = m_column_updates[ul.previous_upper()];
auto new_slack = slack + coeff * (_bound - get_upper_bound(j));
if (is_pos == new_slack.is_pos()) {
if (sign == get_sign(new_slack)) {
//verbose_stream() << "can weaken j" << j << " " << coeff << " " << get_upper_bound(j) << " " << _bound << "\n";
slack = new_slack;
bound_constr_i = _column.upper_bound_witness();
@ -1210,7 +1211,7 @@ namespace lp {
if (ul.previous_lower() != UINT_MAX) {
auto const& [_is_upper, _j, _bound, _column] = m_column_updates[ul.previous_lower()];
auto new_slack = slack + coeff * (_bound - get_lower_bound(j));
if (is_pos == new_slack.is_pos()) {
if (sign == get_sign(new_slack)) {
//verbose_stream() << "can weaken j" << j << " " << coeff << " " << get_lower_bound(j) << " " << _bound << "\n";
slack = new_slack;
bound_constr_i = _column.lower_bound_witness();