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Polysat: conflict resolution updates (#5534)

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* variable elimination / saturation sketch

* conflict resolution updates
This commit is contained in:
Jakob Rath 2021-09-03 19:17:06 +02:00 • committed by GitHub
parent dc547510db
commit 9f387f5738
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14 changed files with 343 additions and 294 deletions
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30
src/math/polysat/variable_elimination.h
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@ -16,37 +16,21 @@ Author:
namespace polysat {
class solver;
class variable_elimination_engine {
public:
virtual ~variable_elimination_engine() {}
virtual bool perform(pvar v, conflict_core& core) = 0;
virtual bool perform(solver& s, pvar v, conflict_core& core) = 0;
};
// discovers when a variable has already been removed... (special case of ve_reduction?)
class ve_trivial final : public variable_elimination_engine {
class ve_reduction : public variable_elimination_engine {
public:
bool perform(pvar v, conflict_core& core) override { NOT_IMPLEMENTED_YET(); return false; }
bool perform(solver& s, pvar v, conflict_core& core) override;
};
// ve by core reduction: try core reduction on all constraints that contain the variable to be eliminated.
// if we cannot eliminate all such constraints, then should we keep all of them instead of eliminating only some? since they might still be useful for saturation.
class ve_reduction final : public variable_elimination_engine {
class ve_forbidden_intervals : public variable_elimination_engine {
public:
bool perform(pvar v, conflict_core& core) override { NOT_IMPLEMENTED_YET(); return false; }
};
class ve_forbidden_intervals final : public variable_elimination_engine {
public:
bool perform(pvar v, conflict_core& core) override { NOT_IMPLEMENTED_YET(); return false; }
};
class variable_elimination final {
scoped_ptr_vector<variable_elimination_engine> ve_engines;
public:
variable_elimination() {}
/// Try to eliminate the variable v from the given core
bool perform(pvar v, conflict_core& core) { NOT_IMPLEMENTED_YET(); return false; }
bool perform(solver& s, pvar v, conflict_core& core) override;
};
}