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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-04-14 08:35:48 -07:00
parent 0c4e4ad702
commit 725b13680e
6 changed files with 80 additions and 104 deletions
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6
src/smt/theory_nseq.cpp
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@ -85,7 +85,6 @@ namespace smt {
std::function<sat::literal(expr*)> literal_if_false = [&](expr* e) {
bool is_not = m.is_not(e, e);
TRACE(seq, tout << "literal_if_false: " << mk_pp(e, m) << " internalized - " << ctx.b_internalized(e) << "\n");
if (!ctx.b_internalized(e))
// it can happen that the element is not internalized, but as soon as we do it, it becomes false.
// In case we just skip one of those uninternalized expressions,
@ -93,14 +92,15 @@ namespace smt {
// Alternatively, we could just retry Nielsen saturation in case
// adding the Nielsen assumption yields the assumption being false after internalizing
ctx.internalize(to_app(e), false);
literal lit = ctx.get_literal(e);
if (is_not)
lit.neg();
if (ctx.get_assignment(lit) == l_false) {
TRACE(seq, tout << "literal_if_false: " << lit << " " << mk_pp(e, m) << " is assigned false\n");
// TRACE(seq, tout << "literal_if_false: " << lit << " " << mk_pp(e, m) << " is assigned false\n");
return lit;
}
TRACE(seq, tout << "literal_if_false: " << mk_pp(e, m) << " is assigned " << ctx.get_assignment(lit) << "\n");
// TRACE(seq, tout << "literal_if_false: " << mk_pp(e, m) << " is assigned " << ctx.get_assignment(lit) << "\n");
return sat::null_literal;
};