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skip non-overlap simplification in rewriter

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-29 17:27:54 -07:00
parent e68c72755a
commit d41ecda03e
3 changed files with 35 additions and 7 deletions
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11
src/smt/seq_regex.cpp
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@ -63,16 +63,21 @@ namespace smt {
bool seq_regex::is_string_equality(literal lit) {
expr* s = nullptr, *r = nullptr;
expr* e = ctx.bool_var2expr(lit.var());
expr_ref id(a().mk_int(e->get_id()), m);
unsigned idx = 0;
VERIFY(str().is_in_re(e, s, r));
sort* seq_sort = m.get_sort(s);
vector<expr_ref_vector> patterns;
auto mk_cont = [&](unsigned idx) {
return sk().mk("seq.cont", id, a().mk_int(idx), seq_sort);
};
if (seq_rw().is_re_contains_pattern(r, patterns)) {
expr_ref t(m);
expr_ref_vector ts(m);
sort* seq_sort = m.get_sort(s);
ts.push_back(m.mk_fresh_const("seq.cont", seq_sort));
ts.push_back(mk_cont(idx));
for (auto const& p : patterns) {
ts.append(p);
ts.push_back(m.mk_fresh_const("seq.cont", seq_sort));
ts.push_back(mk_cont(idx));
}
t = th.mk_concat(ts, seq_sort);
th.propagate_eq(lit, s, t, true);