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Using only one solver

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CEisenhofer 2026-05-07 15:49:16 +02:00
parent 712cd68e8c
commit f7f2ee8f74
8 changed files with 154 additions and 108 deletions
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19
src/smt/theory_nseq.cpp
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@ -34,8 +34,7 @@ namespace smt {
m_egraph(m),
m_sgraph(m, m_egraph),
m_context_solver(m),
m_core_solver(m),
m_nielsen(m_sgraph, m_context_solver, m_core_solver),
m_nielsen(m_sgraph, m_context_solver),
m_axioms(m_th_rewriter),
m_regex(m_sgraph),
m_model(m, ctx, m_seq, m_rewriter, m_sgraph),
@ -1267,6 +1266,19 @@ namespace smt {
// -----------------------------------------------------------------------
bool theory_nseq::get_num_value(expr* e, rational& val) const {
// In QF_SLIA mode theory_lra does not register numeral constants as LP
// variables, so get_value_equiv misses cases where a term is only known
// through an EUF equality with a numeral (e.g. (str.len w) = 5).
// Walk the equivalence class directly first.
if (get_context().e_internalized(e)) {
enode* root = get_context().get_enode(e);
enode* it = root;
do {
if (m_autil.is_numeral(it->get_expr(), val) && val.is_int())
return true;
it = it->get_next();
} while (it != root);
}
return m_arith_value.get_value_equiv(e, val) && val.is_int();
}
@ -1650,7 +1662,8 @@ namespace smt {
continue;
rational val_l;
VERIFY(m_arith_value.get_value(len_expr, val_l));
if (!get_num_value(len_expr, val_l))
continue;
SASSERT(val_l.is_unsigned());