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fix back rewriting for concat

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-01-14 11:22:11 +01:00
parent de9c959241
commit 3ff97357a3
2 changed files with 23 additions and 7 deletions
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18
src/ast/rewriter/seq_rewriter.cpp
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@ -306,14 +306,10 @@ br_status seq_rewriter::mk_seq_concat(expr* a, expr* b, expr_ref& result) {
return BR_REWRITE2;
}
if (m_util.str.is_empty(a)) {
result = a;
return BR_DONE;
}
if (m_util.str.is_empty(b)) {
result = b;
return BR_DONE;
}
if (m_util.re.is_full(a) && m_util.re.is_full(b)) {
if (m_util.str.is_empty(b)) {
result = a;
return BR_DONE;
}
@ -860,6 +856,18 @@ br_status seq_rewriter::mk_str_to_regexp(expr* a, expr_ref& result) {
return BR_FAILED;
}
br_status seq_rewriter::mk_re_concat(expr* a, expr* b, expr_ref& result) {
if (m_util.re.is_full(a) && m_util.re.is_full(b)) {
result = a;
return BR_DONE;
}
if (m_util.re.is_empty(a)) {
result = a;
return BR_DONE;
}
if (m_util.re.is_empty(b)) {
result = b;
return BR_DONE;
}
if (is_epsilon(a)) {
result = b;
return BR_DONE;