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adding Boolean propagation, watch; and factoring

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This commit is contained in:
Nikolaj Bjorner 2021-09-18 22:18:15 -04:00
parent f01da40e49
commit fa3886136b
15 changed files with 341 additions and 134 deletions
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40
src/math/polysat/explain.cpp
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@ -92,8 +92,48 @@ namespace polysat {
return l_false;
}
void ex_polynomial_superposition::reduce_by(pvar v, conflict_core& core) {
return;
bool progress = true;
while (progress) {
progress = false;
for (auto c : core) {
if (is_positive_equality_over(v, c) && reduce_by(v, c, core)) {
progress = true;
break;
}
}
}
}
bool ex_polynomial_superposition::reduce_by(pvar v, signed_constraint eq, conflict_core& core) {
pdd p = eq->to_ule().p();
for (auto c : core) {
if (c == eq)
continue;
if (c->is_ule()) {
auto lhs = c->to_ule().lhs();
auto rhs = c->to_ule().rhs();
auto a = lhs.reduce(v, p);
auto b = rhs.reduce(v, p);
if (a == lhs && b == rhs)
continue;
auto c2 = s().ule(a, b);
if (!c.is_positive())
c2 = ~c2;
vector<signed_constraint> premises;
premises.push_back(eq);
premises.push_back(c);
core.replace(c, c2, premises);
return true;
}
}
return false;
}
bool ex_polynomial_superposition::try_explain(pvar v, conflict_core& core) {
LOG_H3("Trying polynomial superposition...");
reduce_by(v, core);
lbool result = l_undef;
while (result == l_undef)
result = try_explain1(v, core);