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enable ranges for bit-vectors

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-08-13 10:53:37 -07:00
parent 72d140334f
commit c63ad2e834
7 changed files with 84 additions and 4 deletions
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45
src/smt/theory_bv.cpp
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@ -1641,6 +1641,51 @@ namespace smt {
// SASSERT(check_zero_one_bits(v2));
}
bool theory_bv::get_lower(enode* n, rational& value) {
theory_var v = n->get_th_var(get_id());
if (v != null_theory_var && is_bv(v)) {
value = 0;
rational p(1);
for (literal bit : m_bits[v]) {
switch (ctx.get_assignment(bit)) {
case l_true:
value += p;
break;
default:
break;
}
p *= 2;
}
return true;
}
return false;
}
bool theory_bv::get_upper(enode* n, rational& value) {
theory_var v = n->get_th_var(get_id());
if (v != null_theory_var && is_bv(v)) {
literal_vector const & bits = m_bits[v];
rational p = rational::power_of_two(bits.size());
value = p - 1;
p /= 2;
for (unsigned i = bits.size(); i-- > 0; ) {
switch (ctx.get_assignment(bits[i])) {
case l_false:
value -= p;
break;
case l_true:
break;
default: {
break;
}
}
p /= 2;
}
return true;
}
return false;
}
void theory_bv::init_model(model_generator & mg) {
m_factory = alloc(bv_factory, m);
mg.register_factory(m_factory);