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mb-skolem for arithmetic with model repair

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The contract is that users of mb-skolem ensure that
interface equalities are preserved (by adding a
sufficient set of disequalities, such as a chain
x1 < x2 < x3 .., to force that solutions for
x_i does not clash).

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-14 17:13:10 -07:00 • committed by Arie Gurfinkel
parent a0af3383db
commit baa96909cc
5 changed files with 34 additions and 13 deletions
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20
src/qe/qe_arith.cpp
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@ -360,7 +360,7 @@ namespace qe {
ptr_vector<expr> index2expr;
for (auto& kv : tids) {
index2expr.setx(kv.m_value, kv.m_key, 0);
index2expr.setx(kv.m_value, kv.m_key, nullptr);
}
j = 0;
@ -454,6 +454,8 @@ namespace qe {
else if (!d.m_div.is_one() && !is_int) {
t = a.mk_div(t, a.mk_numeral(d.m_div, is_int));
}
update_model(model, to_app(x), eval(t));
SASSERT(eval(t) == eval(x));
result.push_back(def(expr_ref(x, m), t));
}
@ -461,6 +463,22 @@ namespace qe {
return result;
}
void update_model(model& mdl, app* x, expr_ref const& val) {
if (is_uninterp_const(x)) {
mdl.register_decl(x->get_decl(), val);
}
else {
func_interp* fi = mdl.get_func_interp(x->get_decl());
if (!fi) return;
model_evaluator eval(mdl);
expr_ref_vector args(m);
for (expr* arg : *x) {
args.push_back(eval(arg));
}
fi->insert_entry(args.c_ptr(), val);
}
}
expr_ref mk_add(expr_ref_vector const& ts) {
switch (ts.size()) {
case 0: