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Polysat: expand conflict explanation rules (#5366)

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* update example to match slides

* Add normalized view of inequalities

* workaround

* Add a conflict explanation rule

* unit clauses should be asserted at the base level

* Add src constraint to interval

* support non-strict case in first rule

* print conflict constraints only once

* update second rule

* update third rule as well
This commit is contained in:
Jakob Rath 2021-06-23 19:12:39 +02:00 • committed by GitHub
parent dec37aee34
commit 20a5baeb70
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10 changed files with 249 additions and 159 deletions
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14
src/math/polysat/constraint.h
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@ -73,13 +73,24 @@ namespace polysat {
constraint* lookup_external(unsigned dep) const { return m_external_constraints.get(dep, nullptr); }
constraint_ref eq(unsigned lvl, csign_t sign, pdd const& p, p_dependency_ref const& d);
constraint_ref viable(unsigned lvl, csign_t sign, pvar v, bdd const& b, p_dependency_ref const& d);
constraint_ref ule(unsigned lvl, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
constraint_ref ult(unsigned lvl, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
constraint_ref sle(unsigned lvl, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
constraint_ref slt(unsigned lvl, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d);
};
/// Normalized inequality:
/// lhs <= rhs, if !is_strict
/// lhs < rhs, otherwise
struct inequality {
pdd lhs;
pdd rhs;
bool is_strict;
constraint const* src;
};
class constraint {
friend class constraint_manager;
friend class clause;
@ -128,6 +139,7 @@ namespace polysat {
virtual bool is_currently_false(solver& s) = 0;
virtual bool is_currently_true(solver& s) = 0;
virtual void narrow(solver& s) = 0;
virtual inequality as_inequality() const = 0;
eq_constraint& to_eq();
eq_constraint const& to_eq() const;
ule_constraint& to_ule();