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add rewrites for #2575

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-09-20 02:16:22 -07:00
parent 78ed71b8de
commit 12034df11a
3 changed files with 70 additions and 0 deletions
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31
src/ast/rewriter/seq_rewriter.cpp
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@ -1673,6 +1673,37 @@ br_status seq_rewriter::mk_re_concat(expr* a, expr* b, expr_ref& result) {
result = a;
return BR_DONE;
}
expr* a1 = nullptr, *b1 = nullptr;
if (m_util.re.is_star(a, a1) && m_util.re.is_star(b, b1) && a1 == b1) {
result = a;
return BR_DONE;
}
if (m_util.re.is_star(a, a1) && a1 == b) {
result = m_util.re.mk_concat(b, a);
return BR_DONE;
}
{
unsigned lo1, hi1, lo2, hi2;
if (m_util.re.is_loop(a, a1, lo1, hi1) && m_util.re.is_loop(b, b1, lo2, hi2) && a1 == b1) {
result = m_util.re.mk_loop(a1, lo1 + lo2, hi1 + hi2);
return BR_DONE;
}
if (m_util.re.is_loop(a, a1, lo1) && m_util.re.is_loop(b, b1, lo2) && a1 == b1) {
result = m_util.re.mk_loop(a1, lo1 + lo2);
return BR_DONE;
}
}
{
expr* lo1, *hi1, *lo2, *hi2;
if (m_util.re.is_loop(a, a1, lo1, hi1) && m_util.re.is_loop(b, b1, lo2, hi2) && a1 == b1) {
result = m_util.re.mk_loop(a1, m_autil.mk_add(lo1, lo2), m_autil.mk_add(hi1, hi2));
return BR_DONE;
}
if (m_util.re.is_loop(a, a1, lo1) && m_util.re.is_loop(b, b1, lo2) && a1 == b1) {
result = m_util.re.mk_loop(a1, m_autil.mk_add(lo1, lo2));
return BR_DONE;
}
}
return BR_FAILED;
}
/*