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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.cpp
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@ -29,16 +29,21 @@ namespace polysat {
return *dynamic_cast<eq_constraint const*>(this);
}
constraint* constraint::eq(unsigned lvl, bool_var bvar, csign_t sign, pdd const& p, p_dependency_ref& d) {
constraint* constraint::eq(unsigned lvl, bool_var bvar, csign_t sign, pdd const& p, p_dependency_ref const& d) {
return alloc(eq_constraint, lvl, bvar, sign, p, d);
}
constraint* constraint::viable(unsigned lvl, bool_var bvar, csign_t sign, pvar v, bdd const& b, p_dependency_ref& d) {
constraint* constraint::viable(unsigned lvl, bool_var bvar, csign_t sign, pvar v, bdd const& b, p_dependency_ref const& d) {
return alloc(var_constraint, lvl, bvar, sign, v, b, d);
}
constraint* constraint::ule(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref& d) {
constraint* constraint::ule(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d) {
return alloc(ule_constraint, lvl, bvar, sign, a, b, d);
}
constraint* constraint::ult(unsigned lvl, bool_var bvar, csign_t sign, pdd const& a, pdd const& b, p_dependency_ref const& d) {
// a < b <=> !(b <= a)
return ule(lvl, bvar, static_cast<csign_t>(!sign), b, a, d);
}
}