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ensure lengths are registered for disequality fixe #4613

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-08-02 16:13:00 -07:00
parent b82dff531e
commit 7eb05dd952
1 changed files with 14 additions and 2 deletions
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16
src/smt/seq_ne_solver.cpp
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@ -256,8 +256,20 @@ bool theory_seq::branch_nqs() {
}
lbool theory_seq::branch_nq(ne const& n) {
literal eq_len = mk_eq(mk_len(n.l()), mk_len(n.r()), false);
expr_ref len_l(mk_len(n.l()), m);
expr_ref len_r(mk_len(n.r()), m);
if (!has_length(n.l())) {
enque_axiom(len_l);
add_length(n.l(), len_l);
return l_undef;
}
if (!has_length(n.r())) {
enque_axiom(len_r);
add_length(n.r(), len_r);
return l_undef;
}
literal eq_len = mk_eq(len_l, len_r, false);
ctx.mark_as_relevant(eq_len);
switch (ctx.get_assignment(eq_len)) {
case l_false: