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Polysat updates (#5524)

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* Move boolean resolution into conflict_core

* Move store() into dedup functionality

* comments

* Call gc()

* Add inference_engine sketch
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Jakob Rath 2021-08-31 17:16:45 +02:00 • committed by GitHub
parent d1118cb178
commit dde8fb0c37
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8 changed files with 172 additions and 92 deletions
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37
src/math/polysat/explain.h
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@ -21,28 +21,41 @@ namespace polysat {
class solver;
class inference_engine {
public:
virtual ~inference_engine() {}
/** Try to apply an inference rule. Returns true if a new constraint was added to the core. */
virtual bool perform(conflict_explainer& ce) = 0;
};
class inf_polynomial_superposition : public inference_engine {
public:
bool perform(conflict_explainer& ce) override;
};
// TODO: other rules
// clause_ref by_ugt_x();
// clause_ref by_ugt_y();
// clause_ref by_ugt_z();
// clause_ref y_ule_ax_and_x_ule_z();
class conflict_explainer {
solver& m_solver;
pvar m_var = null_var;
ptr_vector<constraint> m_cjust_v;
conflict_core m_conflict;
// TODO: instead of listing methods, create an abstract class for explanation methods, register them in a vector and call them in turn
/* Conflict explanation methods */
clause_ref by_polynomial_superposition();
clause_ref by_ugt_x();
clause_ref by_ugt_y();
clause_ref by_ugt_z();
clause_ref y_ule_ax_and_x_ule_z();
scoped_ptr_vector<inference_engine> inference_engines;
p_dependency_ref null_dep();
// p_dependency_ref null_dep() const { return m_solver.mk_dep_ref(null_dependency); }
bool push_omega_mul(clause_builder& clause, unsigned level, unsigned p, pdd const& x, pdd const& y);
public:
/** Create empty conflict */
conflict_explainer(solver& s);
/** Perform one step of core saturation, if possible.
* Core saturation derives new constraints according applicable inference rules.
*/
bool saturate();
/** resolve conflict state against assignment to v */
void resolve(pvar v, ptr_vector<constraint> const& cjust_v);
void resolve(sat::literal lit);