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constant folding

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-18 19:38:21 -07:00
parent 5bbf05c93c
commit 6e55880601
1 changed files with 4 additions and 0 deletions
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4
src/ast/rewriter/seq_rewriter.cpp
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@ -1984,7 +1984,11 @@ bool seq_rewriter::get_head_tail(expr* s, expr_ref& head, expr_ref& tail) {
}
expr_ref seq_rewriter::kleene_and(expr* cond, expr* r) {
if (m().is_true(cond))
return expr_ref(r, m());
expr* re_empty = m_util.re.mk_empty(m().get_sort(r));
if (m().is_false(cond))
return expr_ref(re_empty, m());
return expr_ref(m().mk_ite(cond, r, re_empty), m());
}