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fix #2909

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-03-25 01:43:13 -07:00
parent 41c68d64d4
commit b8c25ac20b
2 changed files with 40 additions and 21 deletions
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8
src/smt/smt_internalizer.cpp
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@ -441,13 +441,17 @@ namespace smt {
TRACE("distinct", tout << "internalizing distinct: " << mk_pp(n, m) << "\n";);
SASSERT(!b_internalized(n));
SASSERT(m.is_distinct(n));
bool_var v = mk_bool_var(n);
literal l(v);
expr_ref def(m.mk_distinct_expanded(n->get_num_args(), n->get_args()), m);
internalize_rec(def, true);
bool_var v = mk_bool_var(n);
literal l(v);
literal l_def = get_literal(def);
mk_gate_clause(~l, l_def);
mk_gate_clause(l, ~l_def);
// when n->get_num_args() == 2, then mk_distinct_expanded produces a negation.
// reference counts of negations are not tracked so add relevance dependency
// of the equality.
if (m.is_not(def)) def = to_app(def)->get_arg(0);
add_relevancy_dependency(n, def);
if (!gate_ctx) {
mk_enode(n, true, true, false);