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Gamble finder.

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Mathias Soeken 2020-02-25 10:41:02 +01:00 • committed by Nikolaj Bjorner
parent 0caa2f27a1
commit 34a3f8db6e
2 changed files with 63 additions and 0 deletions
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60
src/sat/sat_npn3_finder.cpp
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@ -66,6 +66,7 @@ namespace sat {
find_maj(clauses);
find_orand(clauses);
find_andxor(clauses);
find_gamble(clauses);
}
bool npn3_finder::implies(literal a, literal b) const {
@ -299,6 +300,65 @@ namespace sat {
find_npn3(clauses, m_on_orand, try_orand);
}
void npn3_finder::find_gamble(clause_vector& clauses) {
if (!m_on_gamble) return;
binary_hash_table_t binaries;
ternary_hash_table_t ternaries;
quaternary_hash_table_t quaternaries;
process_more_clauses(clauses, binaries, ternaries, quaternaries);
const auto try_gamble = [&](literal w, literal x, literal y, literal z, clause &c) {
clause *c1, *c2, *c3, *c4;
if (!has_quaternary(quaternaries, ternaries, ~x, ~y, ~z, w, c1)) return false;
if (!has_ternary(ternaries, ~x, y, ~w, c2)) return false;
if (!has_ternary(ternaries, ~y, z, ~w, c3)) return false;
if (!has_ternary(ternaries, x, ~z, ~w, c4)) return false;
c.mark_used();
if (c1) c1->mark_used();
if (c2) c2->mark_used();
if (c3) c3->mark_used();
if (c4) c4->mark_used();
m_on_gamble(w, x, y, z);
return true;
};
for (clause* cp : clauses) {
clause& c = *cp;
if (c.size() != 4 || c.was_used()) continue;
literal w = c[0], x = c[1], y = c[2], z = c[3];
if (try_gamble(w, x, y, z, c)) continue;
if (try_gamble(w, x, z, y, c)) continue;
if (try_gamble(w, y, x, z, c)) continue;
if (try_gamble(w, y, z, x, c)) continue;
if (try_gamble(w, z, x, y, c)) continue;
if (try_gamble(w, z, y, x, c)) continue;
if (try_gamble(x, w, y, z, c)) continue;
if (try_gamble(x, w, z, y, c)) continue;
if (try_gamble(x, y, w, z, c)) continue;
if (try_gamble(x, y, z, w, c)) continue;
if (try_gamble(x, z, w, y, c)) continue;
if (try_gamble(x, z, y, w, c)) continue;
if (try_gamble(y, w, x, z, c)) continue;
if (try_gamble(y, w, z, x, c)) continue;
if (try_gamble(y, x, w, z, c)) continue;
if (try_gamble(y, x, z, w, c)) continue;
if (try_gamble(y, z, w, x, c)) continue;
if (try_gamble(y, z, x, w, c)) continue;
if (try_gamble(z, w, x, y, c)) continue;
if (try_gamble(z, w, y, x, c)) continue;
if (try_gamble(z, x, w, y, c)) continue;
if (try_gamble(z, x, y, w, c)) continue;
if (try_gamble(z, y, w, x, c)) continue;
if (try_gamble(z, y, x, w, c)) continue;
}
std::function<bool(clause*)> not_used = [](clause* cp) { return !cp->was_used(); };
clauses.filter_update(not_used);
}
void npn3_finder::find_andxor(clause_vector& clauses) {
if (!m_on_andxor) return;