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fix #2173

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-03-10 14:42:00 -07:00
parent 376076ea9b
commit 05663592ee
1 changed files with 3 additions and 1 deletions
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4
src/ast/rewriter/bv_rewriter.cpp
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@ -500,12 +500,14 @@ br_status bv_rewriter::mk_leq_core(bool is_signed, expr * a, expr * b, expr_ref
// (bvsle (- x (srem x c1)) c2) -> (bvsle x (+ c1 c2 - 1))
// (bvsle (+ x (* -1 (srem_i x c1))) c2)
// pre: (and (> c1 0) (> c2 0) (= c2 % c1 0) (<= (+ c1 c2 -1) max_int))
if (is_signed && is_num2 && m_util.is_bv_add(a, a1, a2) &&
if (is_signed && is_num2 &&
m_util.is_bv_add(a, a1, a2) &&
m_util.is_bv_mul(a2, a3, a4) && is_numeral(a3, r1, sz) &&
m_util.norm(r1, sz, is_signed).is_minus_one() &&
m_util.is_bv_sremi(a4, a5, a6) && is_numeral(a6, r1, sz) &&
(r1 = m_util.norm(r1, sz, is_signed), r1.is_pos()) &&
r2.is_pos() &&
(a1 == a5) &&
(r2 % r1).is_zero() && r1 + r2 - rational::one() < rational::power_of_two(sz-1)) {
result = m_util.mk_sle(a1, m_util.mk_numeral(r1 + r2 - rational::one(), sz));
return BR_REWRITE2;