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patch bounds normalization bug found by dvitek

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-03-19 18:02:05 -07:00
parent 4732e03259
commit a8fb15ce2c
1 changed files with 23 additions and 3 deletions
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26
src/tactic/bv/bv_size_reduction_tactic.cpp
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@ -123,21 +123,41 @@ struct bv_size_reduction_tactic::imp {
negated = true;
f = to_app(f)->get_arg(0);
}
if (m_util.is_bv_sle(f, lhs, rhs)) {
bv_sz = m_util.get_bv_size(lhs);
if (is_uninterp_const(lhs) && m_util.is_numeral(rhs, val, bv_sz)) {
TRACE("bv_size_reduction", tout << (negated?"not ":"") << mk_ismt2_pp(f, m) << std::endl; );
// v <= k
if (negated) update_signed_lower(to_app(lhs), val+numeral(1));
val = m_util.norm(val, bv_sz, true);
if (negated) {
val += numeral(1);
if (m_util.norm(val, bv_sz, true) != val) {
// bound is infeasible.
}
else {
update_signed_lower(to_app(lhs), val);
}
}
else update_signed_upper(to_app(lhs), val);
}
else if (is_uninterp_const(rhs) && m_util.is_numeral(lhs, val, bv_sz)) {
TRACE("bv_size_reduction", tout << (negated?"not ":"") << mk_ismt2_pp(f, m) << std::endl; );
// k <= v
if (negated) update_signed_upper(to_app(rhs), val-numeral(1));
val = m_util.norm(val, bv_sz, true);
if (negated) {
val -= numeral(1);
if (m_util.norm(val, bv_sz, true) != val) {
// bound is infeasible.
}
else {
update_signed_upper(to_app(lhs), val);
}
}
else update_signed_lower(to_app(rhs), val);
}
}
#if 0
else if (m_util.is_bv_ule(f, lhs, rhs)) {
if (is_uninterp_const(lhs) && m_util.is_numeral(rhs, val, bv_sz)) {