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update spacer projection for arrays to allow ackerman reduction for non-integer arrays

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2025-02-11 17:38:56 -08:00
parent e920291393
commit 9ea921ba8e
1 changed files with 18 additions and 10 deletions
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28
src/muz/spacer/spacer_qe_project.cpp
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@ -2070,7 +2070,8 @@ namespace spacer_qe {
* update sub with val consts for sel terms
*/
void ackermann (ptr_vector<app> const& sel_terms) {
if (sel_terms.empty ()) return;
if (sel_terms.empty ())
return;
expr* v = sel_terms.get (0)->get_arg (0); // array variable
sort* v_sort = v->get_sort ();
@ -2118,10 +2119,19 @@ namespace spacer_qe {
// sort reprs by their value and add a chain of strict inequalities
unsigned num_reprs = m_idx_reprs.size () - start;
if (num_reprs == 0) return;
if (num_reprs == 0)
return;
if (!m_ari_u.is_real(idx_sort) && !m_ari_u.is_int(idx_sort)) {
expr_ref_vector args(m);
for (unsigned i = start; i < m_idx_reprs.size(); ++i)
args.push_back(m_idx_reprs.get(i));
for (unsigned i = 0; i < args.size(); ++i)
for (unsigned j = i + 1; j < args.size(); ++j)
m_idx_lits.push_back(m.mk_not(m.mk_eq(args.get(i), args.get(j))));
return;
}
SASSERT ((m_ari_u.is_real (idx_sort) || m_ari_u.is_int (idx_sort))
&& "Unsupported index sort: neither real nor int");
// using insertion sort
unsigned end = start + num_reprs;
@ -2173,13 +2183,11 @@ namespace spacer_qe {
collect_selects (fml);
// model based ackermannization
sel_map::iterator begin = m_sel_terms.begin (),
end = m_sel_terms.end ();
for (sel_map::iterator it = begin; it != end; it++) {
for (auto const& [key, value] : m_sel_terms) {
TRACE ("qe",
tout << "ackermann for var: " << mk_pp (it->m_key, m) << "\n";
);
ackermann (*(it->m_value));
tout << "ackermann for var: " << mk_pp (key, m) << "\n";
);
ackermann (*value);
}
TRACE ("qe",