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adding Boolean propagation, watch; and factoring

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This commit is contained in:
Nikolaj Bjorner 2021-09-18 22:18:15 -04:00
parent f01da40e49
commit fa3886136b
15 changed files with 341 additions and 134 deletions
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12
src/math/polysat/boolean.h
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@ -28,9 +28,13 @@ namespace polysat {
// For enumerative backtracking we store the lemma we're handling with a certain decision
svector<clause*> m_lemma;
var_queue m_free_vars; // free Boolean variables
vector<ptr_vector<clause>> m_watch; // watch list for literals into clauses
public:
bool_var_manager(): m_free_vars(m_activity) {}
// allocated size (not the number of active variables)
unsigned size() const { return m_level.size(); }
@ -52,8 +56,16 @@ namespace polysat {
clause* lemma(sat::bool_var var) const { SASSERT(is_decision(var)); return m_lemma[var]; }
ptr_vector<clause>& watch(sat::literal lit) { return m_watch[lit.index()]; }
unsigned_vector& activity() { return m_activity; }
bool can_decide() const { return !m_free_vars.empty(); }
sat::bool_var next_var() { return m_free_vars.next_var(); }
// TODO connect activity updates with solver
void inc_activity(sat::literal lit) { m_activity[lit.var()]++; }
void dec_activity(sat::literal lit) { m_activity[lit.var()] /= 2; }
/// Set the given literal to true
void assign(sat::literal lit, unsigned lvl, clause* reason, clause* lemma);