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regression test 2447

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-10-26 08:48:58 -07:00
parent 0b8d7b755d
commit 93427f1175
1 changed files with 5 additions and 2 deletions
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7
src/ast/rewriter/seq_rewriter.cpp
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@ -870,10 +870,13 @@ br_status seq_rewriter::mk_seq_length(expr* a, expr_ref& result) {
} }
// len(extract(x, 0, z)) = min(z, len(x)) // len(extract(x, 0, z)) = min(z, len(x))
if (str().is_extract(a, x, y, z) && if (str().is_extract(a, x, y, z) &&
m_autil.is_numeral(y, r) && r.is_zero()) { m_autil.is_numeral(y, r) && r.is_zero() &&
m_autil.is_numeral(z, r) && r >= 0) {
expr* len_x = str().mk_length(x); expr* len_x = str().mk_length(x);
expr* zero = m_autil.mk_int(0);
result = m().mk_ite(m_autil.mk_le(len_x, z), len_x, z); result = m().mk_ite(m_autil.mk_le(len_x, z), len_x, z);
return BR_REWRITE2; // result = m().mk_ite(m_autil.mk_le(z, zero), zero, result);
return BR_REWRITE_FULL;
} }
#if 0 #if 0
expr* s = nullptr, *offset = nullptr, *length = nullptr; expr* s = nullptr, *offset = nullptr, *length = nullptr;