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This commit is contained in:
Nikolaj Bjorner 2021-04-06 20:09:42 -07:00
parent 0b0efa83ca
commit 1b503b8887
3 changed files with 36 additions and 14 deletions
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12
src/ast/rewriter/seq_rewriter.cpp
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@ -4853,7 +4853,17 @@ bool seq_rewriter::reduce_itos(expr_ref_vector& ls, expr_ref_vector& rs,
bool seq_rewriter::reduce_eq_empty(expr* l, expr* r, expr_ref& result) {
if (str().is_empty(r))
std::swap(l,r);
std::swap(l, r);
if (str().is_length(r))
std::swap(l, r);
#if 0
rational n;
if (str().is_length(l) && m_autil.is_numeral(r, n) && n.is_zero()) {
VERIFY(str().is_length(l, l));
result = m().mk_eq(l, str().mk_empty(l->get_sort()));
return true;
}
#endif
if (!str().is_empty(l))
return false;
expr* s = nullptr, *offset = nullptr, *len = nullptr;