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Handle conversion of quantified lemma to quantifier free

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When a cube is updated, a lemma might loose all of its quantified
variables. In this case, it is effectively quantifier free
and might be a version of an already existing lemma.

For that reason, we convert it to quantifier free lemma when
this happens.
This commit is contained in:
Arie Gurfinkel 2017-12-29 12:03:48 -05:00
parent 23a8e59493
commit 9cdb63ae4a
2 changed files with 23 additions and 8 deletions
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14
src/muz/spacer/spacer_context.cpp
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@ -1300,6 +1300,18 @@ void lemma::update_cube (pob_ref const &p, expr_ref_vector &cube) {
m_body.reset();
m_cube.append(cube);
if (m_cube.empty()) {m_cube.push_back(m.mk_true());}
// after the cube is updated, if there are no skolems,
// convert the lemma to quantifier-free
bool is_quant = false;
for (unsigned i = 0, sz = cube.size(); !is_quant && i < sz; ++i) {
is_quant = has_zk_const(cube.get(i));
}
if (!is_quant) {
m_zks.reset();
m_bindings.reset();
}
}
bool lemma::has_binding(app_ref_vector const &binding) {
@ -2272,7 +2284,7 @@ void context::init_lemma_generalizers(datalog::rule_set& rules)
}
if (m_params.spacer_use_quant_generalizer()) {
m_lemma_generalizers.push_back(alloc(lemma_bool_inductive_generalizer, *this, 0, false));
m_lemma_generalizers.push_back(alloc(lemma_bool_inductive_generalizer, *this, 0, true));
m_lemma_generalizers.push_back(alloc(lemma_quantifier_generalizer, *this));
}