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Don't lose variables when aborting decisions

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This commit is contained in:
Jakob Rath 2022-12-19 14:02:47 +01:00
parent 69b41a7e70
commit ac0e9ebe5f
1 changed files with 10 additions and 2 deletions
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12
src/math/polysat/solver.cpp
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@ -731,9 +731,16 @@ namespace polysat {
SASSERT(!m_search.assignment().contains(v));
if (lemma) {
add_clause(*lemma);
SASSERT(!is_conflict()); // if we have a conflict here, we could have produced this lemma already earlier
if (can_propagate())
if (is_conflict()) {
// If we have a conflict here, we should have produced this lemma already earlier
LOG("Conflict after constraint::produce_lemma: TODO: should have found this lemma earlier");
m_free_pvars.unassign_var_eh(v);
return;
}
if (can_propagate()) {
m_free_pvars.unassign_var_eh(v);
return;
}
}
if (c) {
LOG_H2("Chosen assignment " << assignment_pp(*this, v, val) << " is not actually viable!");
@ -754,6 +761,7 @@ namespace polysat {
return;
case find_t::resource_out:
UNREACHABLE(); // TODO: abort solving
m_free_pvars.unassign_var_eh(v);
return;
}
}