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fix #8572

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-02-10 20:21:51 -08:00
parent b0937d06fa
commit ffd9207bc5
2 changed files with 4 additions and 22 deletions
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5
src/ast/rewriter/seq_axioms.cpp
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@ -121,8 +121,11 @@ namespace seq {
}
expr_ref axioms::mk_len(expr* s) {
expr_ref result(seq.str.mk_length(s), m);
expr_ref len_s(seq.str.mk_length(s), m);
expr_ref result(len_s, m);
m_rewrite(result);
if (result != len_s)
add_clause(mk_eq(len_s, result));
return result;
}

21
src/ast/rewriter/seq_rewriter.cpp
View file

@ -561,29 +561,8 @@ br_status seq_rewriter::mk_seq_length(expr* a, expr_ref& result) {
m_autil.is_numeral(z, r) && r >= 0) {
expr* len_x = str().mk_length(x);
result = m().mk_ite(m_autil.mk_le(len_x, z), len_x, z);
// expr* zero = m_autil.mk_int(0);
// result = m().mk_ite(m_autil.mk_le(z, zero), zero, result);
return BR_REWRITE_FULL;
}
#if 0
expr* s = nullptr, *offset = nullptr, *length = nullptr;
if (str().is_extract(a, s, offset, length)) {
expr_ref len_s(str().mk_length(s), m());
// if offset < 0 then 0
// elif length <= 0 then 0
// elif offset >= len(s) then 0
// elif offset + length > len(s) then len(s) - offset
// else length
result = length;
result = m().mk_ite(m_autil.mk_gt(m_autil.mk_add(offset, length), len_s),
m_autil.mk_sub(len_s, offset),
result);
result = m().mk_ite(m().mk_or(m_autil.mk_le(len_s, offset), m_autil.mk_le(length, zero()), m_autil.mk_lt(offset, zero())),
zero(),
result);
return BR_REWRITE_FULL;
}
#endif
return BR_FAILED;
}