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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-18 19:41:37 -07:00
parent ff34d84b35
commit d26ef08c69
1 changed files with 2 additions and 4 deletions
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6
src/ast/rewriter/seq_rewriter.cpp
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@ -2001,15 +2001,13 @@ expr_ref seq_rewriter::is_nullable(expr* r) {
SASSERT(m_util.is_re(r));
expr* r1 = nullptr, *r2 = nullptr;
unsigned lo = 0, hi = 0;
if (m_util.re.is_concat(r, r1, r2)) {
if (m_util.re.is_concat(r, r1, r2) ||
m_util.re.is_intersection(r, r1, r2)) {
return expr_ref(mk_and(m(), is_nullable(r1), is_nullable(r2)), m());
}
if (m_util.re.is_union(r, r1, r2)) {
return expr_ref(mk_or(m(), is_nullable(r1), is_nullable(r2)), m());
}
if (m_util.re.is_intersection(r, r1, r2)) {
return expr_ref(mk_and(m(), is_nullable(r1), is_nullable(r2)), m());
}
if (m_util.re.is_star(r) ||
m_util.re.is_opt(r) ||
m_util.re.is_full_seq(r)) {