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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-09-03 08:11:43 -07:00
parent aa66be9406
commit fe43f8df8f
4 changed files with 129 additions and 21 deletions
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55
src/sat/smt/bv_solver.cpp
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@ -52,5 +52,60 @@ namespace bv {
fixed_var_eh(v);
}
/**
\brief v[idx] = ~v'[idx], then v /= v' is a theory axiom.
*/
void solver::find_new_diseq_axioms(var_pos_occ* occs, theory_var v, unsigned idx) {
literal l = m_bits[v][idx];
l.neg();
while (occs) {
theory_var v2 = occs->m_var;
unsigned idx2 = occs->m_idx;
if (idx == idx2 && m_bits[v2][idx2] == l && get_bv_size(v2) == get_bv_size(v))
mk_new_diseq_axiom(v, v2, idx);
occs = occs->m_next;
}
}
/**
\brief v1[idx] = ~v2[idx], then v1 /= v2 is a theory axiom.
*/
void solver::mk_new_diseq_axiom(theory_var v1, theory_var v2, unsigned idx) {
if (!get_config().m_bv_eq_axioms)
return;
// TBD: disabled until new literal creation is supported
return;
SASSERT(m_bits[v1][idx] == ~m_bits[v2][idx]);
TRACE("bv_solver", tout << "found new diseq axiom\n" << pp(v1) << pp(v2););
m_stats.m_num_diseq_static++;
expr_ref eq(m.mk_eq(get_expr(v1), get_expr(v2)), m);
sat::literal not_eq = ctx.internalize(eq, true, false, m_is_redundant);
s().add_clause(1, &not_eq, sat::status::th(m_is_redundant, get_id()));
}
std::ostream& solver::display(std::ostream& out, theory_var v) const {
out << "v";
out.width(4);
out << std::left << v;
out << " #";
out.width(4);
out << get_enode(v)->get_owner_id() << " -> #";
out.width(4);
#if 0
out << get_enode(find(v))->get_owner_id();
out << std::right << ", bits:";
literal_vector const& bits = m_bits[v];
for (literal lit : bits) {
out << " " << lit << ":";
ctx.display_literal(out, lit);
}
numeral val;
if (get_fixed_value(v, val))
out << ", value: " << val;
out << "\n";
#endif
return out;
}
}