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don't rewrite empty/non-empty checking predicates

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-07-31 11:46:38 -07:00
parent 615e2cf37c
commit 97ed1cd07d
1 changed files with 1 additions and 4 deletions
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5
src/smt/seq_regex.cpp
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@ -411,10 +411,8 @@ namespace smt {
<< "," << expr_id_str(u) << "," << expr_id_str(n) << ") ";);
expr_ref is_nullable = is_nullable_wrapper(r);
if (m.is_true(is_nullable)) {
TRACE("seq_regex", tout << "is nullable\n";);
if (m.is_true(is_nullable))
return;
}
literal null_lit = th.mk_literal(is_nullable);
expr_ref hd = mk_first(r, n);
expr_ref d(m);
@ -441,7 +439,6 @@ namespace smt {
lits.push_back(th.mk_literal(next_non_empty));
}
TRACE("seq_regex", tout << lits << "\n";);
th.add_axiom(lits);
}