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simplify #5431

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-07-25 09:57:38 -07:00
parent 4fd1e6d32c
commit b638405e42
1 changed files with 10 additions and 17 deletions
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27
src/ast/rewriter/seq_rewriter.cpp
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@ -3341,23 +3341,16 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
}
else if (str().is_itos(r1, r2))
{
//here r1 = (str.from_int r2) and r2 is non-ground
//or else the expression would have been simplified earlier
//so r1 must be nonempty and must consists of decimal digits
//'0' = char(48) <= elem <= char(57) = '9'
m_br.mk_and(u().mk_le(m_util.mk_char(48), ele), u().mk_le(ele, m_util.mk_char(57)), result);
if (m().is_false(result))
return mk_empty();
hd = str().mk_nth_i(r1, m_autil.mk_int(0));
m_br.mk_and(result, m().mk_eq(hd, ele), result); // result := result & ele = (hd r1)
if (m().is_false(result))
return mk_empty();
tl = str().mk_substr(r1, m_autil.mk_int(1), m_autil.mk_sub(str().mk_length(r1), m_autil.mk_int(1)));
//if ((isdigit ele) and (ele = (hd r1))) then (to_re (tl r1)) else []
result = re_and(result, re().mk_to_re(tl));
return result;
//
// here r1 = (str.from_int r2) and r2 is non-ground
// or else the expression would have been simplified earlier
// so r1 must be nonempty and must consists of decimal digits
// '0' <= elem <= '9'
// if ((isdigit ele) and (ele = (hd r1))) then (to_re (tl r1)) else []
//
m_br.mk_and(u().mk_le(m_util.mk_char('0'), ele), u().mk_le(ele, m_util.mk_char('9')), m().mk_eq(hd, ele), result);
tl = re().mk_to_re(str().mk_substr(r1, m_autil.mk_int(1), m_autil.mk_sub(str().mk_length(r1), m_autil.mk_int(1))));
return re_and(result, tl);
}
#if 0
else {