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sketch bit-constraints

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-04-15 23:04:25 -07:00
parent dce9740a38
commit e970fe5034
8 changed files with 162 additions and 22 deletions
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23
src/math/polysat/constraint.h
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@ -12,20 +12,22 @@ Abstract:
Author:
Nikolaj Bjorner (nbjorner) 2021-03-19
Jakob Rath 2021-04-6
--*/
#pragma once
#include "math/polysat/types.h"
namespace polysat {
enum ckind_t { eq_t, ule_t, sle_t };
enum ckind_t { eq_t, ule_t, sle_t, bit_t };
class eq_constraint;
class bit_constraint;
class ule_constraint;
class constraint {
friend class bit_constraint;
friend class eq_constraint;
friend class ule_constraint;
unsigned m_level;
@ -46,6 +48,7 @@ namespace polysat {
virtual constraint* resolve(solver& s, pvar v) = 0;
virtual bool is_always_false() = 0;
virtual bool is_currently_false(solver& s) = 0;
virtual void narrow(solver& s) = 0;
eq_constraint& to_eq();
eq_constraint const& to_eq() const;
p_dependency* dep() const { return m_dep; }
@ -53,22 +56,6 @@ namespace polysat {
unsigned level() const { return m_level; }
};
class eq_constraint : public constraint {
pdd m_poly;
public:
eq_constraint(unsigned lvl, pdd const& p, p_dependency_ref& dep):
constraint(lvl, dep, ckind_t::eq_t), m_poly(p) {
m_vars.append(p.free_vars());
}
~eq_constraint() override {}
pdd const & p() const { return m_poly; }
std::ostream& display(std::ostream& out) const override;
bool propagate(solver& s, pvar v) override;
constraint* resolve(solver& s, pvar v) override;
bool is_always_false() override;
bool is_currently_false(solver& s) override;
};
inline std::ostream& operator<<(std::ostream& out, constraint const& c) { return c.display(out); }