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correct newly introduced rewrite

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This commit is contained in:
Nikolaj Bjorner 2020-05-02 10:15:06 -07:00
parent ec8866c91a
commit f313ab9e4c
1 changed files with 8 additions and 4 deletions
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12
src/ast/rewriter/bv_rewriter.cpp
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@ -510,10 +510,14 @@ br_status bv_rewriter::mk_leq_core(bool is_signed, expr * a, expr * b, expr_ref
return BR_REWRITE2;
}
// (bvule c (+ c a)) -> (bvule a (2^n - c)) (could be generalized)
if (!is_signed && is_num1 && m_util.is_bv_add(b, a1, a2) && is_numeral(a1, r2, sz) && r1 == r2) {
result = m_util.mk_ule(a2, m_util.mk_numeral(-r1, sz));
return BR_REWRITE1;
// (bvule r1 (+ r2 a)) ->
// for r1 = r2, (bvule a (2^n - r2 - 1))
// other cases r1 > r2, r1 < r2 are TBD
if (!is_signed && is_num1 && m_util.is_bv_add(b, a1, a2) && is_numeral(a1, r2, sz)) {
if (r1 == r2) {
result = m_util.mk_ule(a2, m_util.mk_numeral(-r2 - 1, sz));
return BR_REWRITE1;
}
}
if (m_le_extra) {