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Generalized variable elimination

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This commit is contained in:
Clemens Eisenhofer 2022-12-29 22:31:39 +01:00
parent ab9a9d2308
commit 6f78c33558
7 changed files with 235 additions and 65 deletions
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35
src/math/polysat/variable_elimination.h
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@ -15,6 +15,7 @@ Author:
#include "math/polysat/types.h"
#include "math/polysat/constraint.h"
#include "math/polysat/clause_builder.h"
namespace polysat {
@ -50,6 +51,36 @@ namespace polysat {
public:
free_variable_elimination(solver& s): s(s) {}
void find_lemma(conflict& core);
};
};
class saturation;
class parity_tracker {
solver& s;
clause_builder m_builder;
vector<optional<std::pair<pvar, bool_vector>>> m_odd;
unsigned_vector m_inverse;
struct optional_pdd_hash {
unsigned operator()(optional<pdd> const& args) const {
return args->hash();
}
};
using pdd_to_id = map<optional<pdd>, unsigned, optional_pdd_hash, default_eq<optional<pdd>>>;
pdd_to_id m_pdd_to_id; // if we want to use arbitrary pdds instead of pvars
unsigned get_id(const pdd& p);
public:
parity_tracker(solver& s) : s(s), m_builder(s) {}
pdd get_inverse(const pdd& p);
pdd get_odd(const pdd& p, unsigned parity, svector<signed_constraint>& pat);
std::tuple<pdd, bool, svector<signed_constraint>> eliminate_variable(saturation& saturation, pvar x, const pdd& a, const pdd& b, const pdd& p);
};
}