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seq_ne_solver: short-circuit propagate_ne2eq for str.unit elements

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-04-01 22:06:52 +00:00 • committed by GitHub
parent 57fdf43475
commit ec495c094c
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1 changed files with 3 additions and 2 deletions
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src/smt/seq_ne_solver.cpp
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@ -134,11 +134,12 @@ bool theory_seq::propagate_ne2eq(unsigned idx, expr_ref_vector const& es) {
if (es.empty()) if (es.empty())
return false; return false;
for (expr* e : es) { for (expr* e : es) {
if (m_util.str.is_unit(e))
return true;
expr_ref len_e = mk_len(e); expr_ref len_e = mk_len(e);
rational lo; rational lo;
if (lower_bound(len_e, lo) && lo > 0) { if (lower_bound(len_e, lo) && lo > 0)
return true; return true;
}
} }
ne const& n = m_nqs[idx]; ne const& n = m_nqs[idx];
expr_ref e(m), head(m), tail(m); expr_ref e(m), head(m), tail(m);