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more to #3926

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-13 16:04:44 -07:00
parent 7caae3f5d2
commit e1027790ae
1 changed files with 14 additions and 15 deletions
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29
src/ast/rewriter/seq_rewriter.cpp
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@ -676,8 +676,7 @@ bool seq_rewriter::is_suffix(expr* s, expr* offset, expr* len) {
(a.neg(), m_autil.is_numeral(offset, b) &&
b.is_pos() &&
a == b &&
lens.size() == 1 &&
lens[0] == s);
lens.contains(s));
}
bool seq_rewriter::sign_is_determined(expr* e, sign& s) {
@ -696,18 +695,6 @@ bool seq_rewriter::sign_is_determined(expr* e, sign& s) {
}
return true;
}
if (m_util.str.is_length(e)) {
s = sign_pos;
return true;
}
rational pos;
if (m_autil.is_numeral(e, pos)) {
if (pos.is_pos())
s = sign_pos;
else if (pos.is_neg())
s = sign_neg;
return true;
}
if (m_autil.is_mul(e)) {
for (expr* arg : *to_app(e)) {
sign s1;
@ -726,7 +713,19 @@ bool seq_rewriter::sign_is_determined(expr* e, sign& s) {
}
return true;
}
return true;
if (m_util.str.is_length(e)) {
s = sign_pos;
return true;
}
rational r;
if (m_autil.is_numeral(e, r)) {
if (r.is_pos())
s = sign_pos;
else if (r.is_neg())
s = sign_neg;
return true;
}
return false;
}
br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& result) {