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Polysat: first pass at forbidden intervals (not yet fully integrated into solver) (#5227)

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* Add interval class

* Take dependency as const reference

* Compute forbidden intervals for ule-constraints

* Add class for evaluated interval

* We need the evaluated bounds as well

* Don't add constraint to cjust multiple times (hack, to be improved later)

* typo

* More interval helpers

* Add constraint::ult factory function

* Fix forbidden interval condition

* Add solver::has_viable

* Add conflict explanation using forbidden intervals (not yet fully integrated into solver)
This commit is contained in:
Jakob Rath 2021-04-29 19:12:54 +02:00 • committed by GitHub
parent 60972de562
commit f83705bf9f
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14 changed files with 501 additions and 13 deletions
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11
src/math/polysat/constraint.h
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@ -13,6 +13,7 @@ Author:
--*/
#pragma once
#include "math/polysat/types.h"
#include "math/polysat/interval.h"
namespace polysat {
@ -34,12 +35,13 @@ namespace polysat {
bool_var m_bool_var;
csign_t m_sign; ///< sign/polarity
lbool m_status = l_undef; ///< current constraint status, computed from value of m_bool_var and m_sign
constraint(unsigned lvl, bool_var bvar, csign_t sign, p_dependency_ref& dep, ckind_t k):
constraint(unsigned lvl, bool_var bvar, csign_t sign, p_dependency_ref const& dep, ckind_t k):
m_level(lvl), m_kind(k), m_dep(dep), m_bool_var(bvar), m_sign(sign) {}
public:
static constraint* eq(unsigned lvl, bool_var bvar, csign_t sign, pdd const& p, p_dependency_ref& d);
static constraint* viable(unsigned lvl, bool_var bvar, csign_t sign, pvar v, bdd const& b, p_dependency_ref& d);
static constraint* ule(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref& d);
static constraint* eq(unsigned lvl, bool_var bvar, csign_t sign, pdd const& p, p_dependency_ref const& d);
static constraint* viable(unsigned lvl, bool_var bvar, csign_t sign, pvar v, bdd const& b, p_dependency_ref const& d);
static constraint* ule(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
static constraint* ult(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
virtual ~constraint() {}
bool is_eq() const { return m_kind == ckind_t::eq_t; }
bool is_ule() const { return m_kind == ckind_t::ule_t; }
@ -63,6 +65,7 @@ namespace polysat {
bool is_positive() const { return m_status == l_true; }
bool is_negative() const { return m_status == l_false; }
bool is_undef() const { return m_status == l_undef; }
virtual bool forbidden_interval(solver& s, pvar v, eval_interval& i, constraint*& neg_condition) { return false; }
};
inline std::ostream& operator<<(std::ostream& out, constraint const& c) { return c.display(out); }