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add filter for avoiding creating redundant disequality axioms

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-03-19 23:15:23 -07:00
parent 1d928663de
commit 0f4126f665
4 changed files with 20 additions and 3 deletions
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8
src/smt/theory_nseq.cpp
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@ -63,9 +63,14 @@ namespace smt {
std::function < void(void)> ensure_digit_axiom = [&]() {
throw default_exception("digit axioms should be added lazily via seq_axioms::ensure_digit_axiom");
};
std::function<void(expr *)> mark_no_diseq = [&](expr *e) {
m_no_diseq_set.insert(e);
ctx.push_trail(insert_obj_trail(m_no_diseq_set, e));
};
m_axioms.set_add_clause(add_clause);
m_axioms.set_phase(set_phase);
m_axioms.set_ensure_digits(ensure_digit_axiom);
m_axioms.set_mark_no_diseq(mark_no_diseq);
}
// -----------------------------------------------------------------------
@ -177,10 +182,11 @@ namespace smt {
void theory_nseq::new_diseq_eh(theory_var v1, theory_var v2) {
expr* e1 = get_enode(v1)->get_expr();
expr* e2 = get_enode(v2)->get_expr();
TRACE(seq, tout << mk_pp(e1, m) << " != " << mk_pp(e2, m) << "\n");
if (m_seq.is_re(e1))
// regex disequality: nseq cannot verify language non-equivalence
push_unhandled_pred();
else if (m_seq.is_seq(e1))
else if (m_seq.is_seq(e1) && !m_no_diseq_set.contains(e1) && !m_no_diseq_set.contains(e2))
m_axioms.diseq_axiom(e1, e2);
else
;