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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-05 21:51:34 -08:00
parent 2acab46388
commit 63fc62fbe4
6 changed files with 72 additions and 51 deletions
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49
src/sat/sat_aig_finder.cpp
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@ -35,15 +35,13 @@ namespace sat {
return false;
}
void aig_finder::find_aigs(clause_vector& clauses) {
if (!m_on_aig) {
return;
}
unsigned j = 0;
for (clause* cp : clauses) {
clause& c = *cp;
if (!find_aig(c)) {
if (!find_aig(*cp)) {
clauses[j++] = cp;
}
}
@ -61,9 +59,7 @@ namespace sat {
for (literal head : c) {
is_aig = true;
for (literal tail : c) {
if (head == tail)
continue;
if (!implies(head, ~tail)) {
if (head != tail && !implies(head, ~tail)) {
is_aig = false;
break;
}
@ -187,25 +183,28 @@ namespace sat {
insert_ternary(*cp);
}
auto try_ite = [&,this](literal x, literal y, literal z, clause& c) {
clause* c1, *c3;
if (has_ternary(y, ~z, ~x, c1)) {
binary b(~y, x, nullptr);
if (!binaries.find(b, b)) {
return false;
}
for (auto p : *b.use_list) {
literal u = p.first;
clause* c2 = p.second;
if (has_ternary(~u, ~x, ~y, c3)) {
c.mark_used();
if (c1) c1->mark_used();
if (c2) c2->mark_used();
if (c3) c3->mark_used();
// DEBUG_CODE(validate_if(~x, ~y, z, u, c, c1, c2, c3););
m_on_if(~x, ~y, z, u);
return true;
}
literal u;
clause* c1, *c2, *c3;
if (!has_ternary(y, ~z, ~x, c1)) {
return false;
}
binary b(~y, x, nullptr);
if (!binaries.find(b, b)) {
return false;
}
for (auto p : *b.use_list) {
u = p.first;
c2 = p.second;
if (!has_ternary(~u, ~x, ~y, c3)) {
continue;
}
c.mark_used();
if (c1) c1->mark_used();
if (c2) c2->mark_used();
if (c3) c3->mark_used();
// DEBUG_CODE(validate_if(~x, ~y, z, u, c, c1, c2, c3););
m_on_if(~x, ~y, z, u);
return true;
}
return false;
};
@ -214,7 +213,7 @@ namespace sat {
clause& c = *cp;
if (c.size() != 3 || c.was_used()) continue;
literal x = c[0], y = c[1], z = c[2];
if (try_ite(x, y, z, c)) continue;
if (try_ite(x, z, y, c)) continue;
if (try_ite(y, x, z, c)) continue;
if (try_ite(z, y, x, c)) continue;
}