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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-11-03 01:09:08 -08:00
parent 752f08c9d6
commit a4354c960c
1 changed files with 11 additions and 0 deletions
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11
src/sat/smt/q_mbi.cpp
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@ -279,20 +279,31 @@ namespace q {
/*
* Remove occurrences of free functions that contain variables.
* Add top-level equalities for those occurrences.
*
* F[g(t)] -> F[s] & g(t) = s
*
* where
* - eval(g(t)) = eval(s),
* - t contains bound variables,
* - s is ground.
*/
void mbqi::eliminate_nested_vars(expr_ref_vector& fmls, q_body& qb) {
if (qb.var_args.empty())
return;
expr_safe_replace rep(m);
var_subst subst(m);
expr_ref_vector eqs(m);
for (auto p : qb.var_args) {
expr_ref _term = subst(p.first, qb.vars);
app_ref term(to_app(_term), m);
expr_ref value = (*m_model)(term);
expr* s = m_model_fixer.invert_app(term, value);
rep.insert(term, s);
eqs.push_back(m.mk_eq(term, s));
}
rep(fmls);
fmls.append(eqs);
}
/*