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don't lose equalities over ite, #2317

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-06-04 20:32:24 -07:00
parent 8140edfd59
commit 2788f72bbb
1 changed files with 6 additions and 3 deletions
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9
src/smt/theory_seq.cpp
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@ -272,8 +272,8 @@ theory_seq::theory_seq(ast_manager& m, theory_seq_params const & params):
m_find(*this),
m_overlap(m),
m_overlap2(m),
m_internal_nth_es(m),
m_len_prop_lvl(-1),
m_internal_nth_es(m),
m_factory(nullptr),
m_exclude(m),
m_axioms(m),
@ -4218,12 +4218,15 @@ expr_ref theory_seq::expand1(expr* e0, dependency*& eqs) {
result = m_util.str.mk_last_index(arg1, arg2);
}
else if (m.is_ite(e, e1, e2, e3)) {
if (ctx.e_internalized(e) && ctx.e_internalized(e2) && ctx.get_enode(e)->get_root() == ctx.get_enode(e2)->get_root()) {
enode* r = get_root(e);
enode* r2 = get_root(e2);
enode* r3 = get_root(e3);
if (ctx.e_internalized(e) && ctx.e_internalized(e2) && r == r2 && r != r3) {
result = try_expand(e2, deps);
if (!result) return result;
add_dependency(deps, ctx.get_enode(e), ctx.get_enode(e2));
}
else if (ctx.e_internalized(e) && ctx.e_internalized(e2) && ctx.get_enode(e)->get_root() == ctx.get_enode(e3)->get_root()) {
else if (ctx.e_internalized(e) && ctx.e_internalized(e2) && r == r3 && r != r2) {
result = try_expand(e3, deps);
if (!result) return result;
add_dependency(deps, ctx.get_enode(e), ctx.get_enode(e3));