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local changes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-12-22 09:27:33 -08:00
commit c61e9f27db
17 changed files with 254 additions and 123 deletions
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28
src/tactic/bv/bv_size_reduction_tactic.cpp
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@ -151,7 +151,7 @@ struct bv_size_reduction_tactic::imp {
// bound is infeasible.
}
else {
update_signed_upper(to_app(lhs), val);
update_signed_upper(to_app(rhs), val);
}
}
else update_signed_lower(to_app(rhs), val);
@ -229,17 +229,35 @@ struct bv_size_reduction_tactic::imp {
else {
// l < u
if (l.is_neg()) {
unsigned i_nb = (u - l).get_num_bits();
unsigned l_nb = (-l).get_num_bits();
unsigned v_nb = m_util.get_bv_size(v);
if (i_nb < v_nb) {
new_const = m.mk_fresh_const(0, m_util.mk_sort(i_nb));
new_def = m_util.mk_sign_extend(v_nb - i_nb, new_const);
if (u.is_neg())
{
// l <= v <= u <= 0
unsigned i_nb = l_nb;
TRACE("bv_size_reduction", tout << " l <= " << v->get_decl()->get_name() << " <= u <= 0 " << " --> " << i_nb << " bits\n";);
if (i_nb < v_nb) {
new_const = m.mk_fresh_const(0, m_util.mk_sort(i_nb));
new_def = m_util.mk_concat(m_util.mk_numeral(numeral(-1), v_nb - i_nb), new_const);
}
}
else {
// l <= v <= 0 <= u
unsigned u_nb = u.get_num_bits();
unsigned i_nb = ((l_nb > u_nb) ? l_nb : u_nb) + 1;
TRACE("bv_size_reduction", tout << " l <= " << v->get_decl()->get_name() << " <= 0 <= u " << " --> " << i_nb << " bits\n";);
if (i_nb < v_nb) {
new_const = m.mk_fresh_const(0, m_util.mk_sort(i_nb));
new_def = m_util.mk_sign_extend(v_nb - i_nb, new_const);
}
}
}
else {
// 0 <= l <= v <= u
unsigned u_nb = u.get_num_bits();
unsigned v_nb = m_util.get_bv_size(v);
TRACE("bv_size_reduction", tout << l << " <= " << v->get_decl()->get_name() << " <= " << u << " --> " << u_nb << " bits\n";);
if (u_nb < v_nb) {
new_const = m.mk_fresh_const(0, m_util.mk_sort(u_nb));
new_def = m_util.mk_concat(m_util.mk_numeral(numeral(0), v_nb - u_nb), new_const);