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fix #1005, disable expansion of regular expression range to union as it degrades performance significantly

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-05-05 10:59:47 -04:00
parent 9499fa62ac
commit 7e1fae418a
3 changed files with 9 additions and 5 deletions
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1
src/ast/rewriter/seq_rewriter.cpp
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@ -1434,6 +1434,7 @@ br_status seq_rewriter::mk_re_star(expr* a, expr_ref& result) {
* (re.range c_1 c_n) = (re.union (str.to.re c1) (str.to.re c2) ... (str.to.re cn))
*/
br_status seq_rewriter::mk_re_range(expr* lo, expr* hi, expr_ref& result) {
return BR_FAILED;
TRACE("seq", tout << "rewrite re.range [" << mk_pp(lo, m()) << " " << mk_pp(hi, m()) << "]\n";);
zstring str_lo, str_hi;
if (m_util.str.is_string(lo, str_lo) && m_util.str.is_string(hi, str_hi)) {