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Lemma validity check

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This commit is contained in:
Jakob Rath 2023-03-12 16:26:05 +01:00
parent 50876a4dae
commit aef0c739a7
2 changed files with 58 additions and 1 deletions
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4
src/math/polysat/saturation.cpp
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@ -1358,10 +1358,11 @@ namespace polysat {
for (auto c : core) {
change = false;
if (c == a_l_b.as_signed_constraint())
if (c == a_l_b)
continue;
LOG("Trying to eliminate v" << x << " in " << c << " by using equation " << a_l_b.as_signed_constraint());
if (c->is_ule()) {
set_rule("[x] ax + b = 0 & C[x] => C[-inv(a)*b] ule");
// If both are equalities this boils down to polynomial superposition => Might generate the same lemma twice
auto const& ule = c->to_ule();
m_lemma.reset();
@ -1376,6 +1377,7 @@ namespace polysat {
prop = true;
}
else if (c->is_umul_ovfl()) {
set_rule("[x] ax + b = 0 & C[x] => C[-inv(a)*b] umul_ovfl");
auto const& ovf = c->to_umul_ovfl();
m_lemma.reset();
auto [lhs_new, changed_lhs] = m_parity_tracker.eliminate_variable(*this, x, a, b, ovf.p(), m_lemma);