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fix zero_ext constraint (2)

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This commit is contained in:
Jakob Rath 2023-08-03 15:16:27 +02:00
parent 6e9f07e7c5
commit 63e81e2bb0
1 changed files with 8 additions and 7 deletions
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15
src/math/polysat/constraint_manager.cpp
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@ -639,18 +639,19 @@ namespace polysat {
unsigned const v_sz = p_sz + extra_bits;
if (p.is_val())
return s.sz2pdd(v_sz).mk_val(p.val());
pdd const q = s.var(s.m_names.mk_name(p));
constraint_dedup::bv_ext_args const args = {false, q.var(), extra_bits};
pvar const p_name = s.m_names.mk_name(p);
constraint_dedup::bv_ext_args const args = {false, p_name, extra_bits};
auto const it = m_dedup.m_bv_ext_expr.find_iterator(args);
if (it != m_dedup.m_bv_ext_expr.end())
return s.var(it->m_value);
pdd const v = s.var(s.add_var(v_sz));
m_dedup.m_bv_ext_expr.insert(args, v.var());
pvar const v = s.add_var(v_sz);
pdd const V = s.var(v);
m_dedup.m_bv_ext_expr.insert(args, v);
// (1) v[|p|-1:0] = p
s.add_eq(q, extract(v, p.power_of_2() - 1, 0));
s.add_eq(extract(V, p_sz - 1, 0), s.var(p_name));
// (2) v < 2^|p|
s.add_ule(q, p.manager().max_value());
return v;
s.add_ule(V, p.manager().max_value());
return V;
}
pdd constraint_manager::sign_ext(pdd const& p, unsigned extra_bits) {