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Polysat: fixes in solver, forbidden intervals for eq_constraint (#5240)

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* Rename to neg_cond

* Add some logging utilities

* Implement case of forbidden interval covering the whole domain

* Implement diseq_narrow

* Do not activate constraint if we are in a conflict state

* comments

* Assert that lemma isn't undefined

* Update revert_decision to work in the case where narrowing causes propagation

* Fix case of non-disjunctive lemma from forbidden intervals

* Conflict should not leak outside user scope

* Add guard to decide(), some notes

* Add test case

* Add constraints to watchlist of unassigned variable during propagation

* Move common propagation functionality into base class

* Combine eq/diseq narrow

* Compute forbidden interval for equality constraints by considering them as p <=u 0 (or p >u 0 for disequalities)
This commit is contained in:
Jakob Rath 2021-05-03 18:30:17 +02:00 • committed by GitHub
parent 04876ba8b7
commit f7e476a4a0
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15 changed files with 350 additions and 130 deletions
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src/math/polysat/var_constraint.h
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@ -33,7 +33,6 @@ namespace polysat {
constraint(lvl, bvar, sign, dep, ckind_t::bit_t), m_var(v), m_viable(b) {}
~var_constraint() override {}
std::ostream& display(std::ostream& out) const override;
bool propagate(solver& s, pvar v) override;
constraint* resolve(solver& s, pvar v) override;
void narrow(solver& s) override;
bool is_always_false() override;