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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-09-11 16:55:49 +02:00
parent d514464e30
commit f8a3857adb
7 changed files with 61 additions and 40 deletions
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31
src/math/polysat/constraint.cpp
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@ -112,8 +112,35 @@ namespace polysat {
}
void constraint_manager::gc() {
// collect used literals from lemmas and stack
// walk constraints to remove unused.
gc_clauses();
gc_constraints();
}
void constraint_manager::gc_clauses() {
// place to gc redundant clauses
}
void constraint_manager::gc_constraints() {
uint_set used_vars;
for (auto const& cls : m_clauses)
for (auto const& cl : cls)
for (auto lit : *cl)
used_vars.insert(lit.var());
#if 0
// anything on the search stack is justified by a clause?
for (auto const& a : s().m_search)
if (a.is_boolean())
used_vars.insert(a.lit().var());
#endif
for (unsigned i = 0; i < m_constraints.size(); ++i) {
constraint* c = m_constraints[i];
if (c->has_bvar() && used_vars.contains(c->bvar()))
continue;
m_constraints.swap(i, m_constraints.size() - 1);
m_constraints.pop_back();
--i;
}
}
bool constraint_manager::should_gc() {