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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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GPG key ID: 4AEE18F83AFDEB23
14 changed files with 501 additions and 13 deletions
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4
src/math/polysat/ule_constraint.h
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@ -21,7 +21,7 @@ namespace polysat {
pdd m_lhs;
pdd m_rhs;
public:
ule_constraint(unsigned lvl, bool_var bvar, csign_t sign, pdd const& l, pdd const& r, p_dependency_ref& dep):
ule_constraint(unsigned lvl, bool_var bvar, csign_t sign, pdd const& l, pdd const& r, p_dependency_ref const& dep):
constraint(lvl, bvar, sign, dep, ckind_t::ule_t), m_lhs(l), m_rhs(r) {
m_vars.append(l.free_vars());
for (auto v : r.free_vars())
@ -39,6 +39,8 @@ namespace polysat {
bool is_currently_false(solver& s) override;
bool is_currently_true(solver& s) override;
void narrow(solver& s) override;
bool forbidden_interval(solver& s, pvar v, eval_interval& i, constraint*& neg_condition) override;
};
}