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#6116 bv2int bug fix

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This commit is contained in:
Nikolaj Bjorner 2022-08-31 17:31:26 -07:00
parent f72cdda5fb
commit 6077c4154a
4 changed files with 76 additions and 29 deletions
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70
src/sat/smt/bv_solver.cpp
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@ -216,10 +216,11 @@ namespace bv {
euf::enode* bv2int_arg = bv2int->get_arg(0);
for (euf::enode* p : euf::enode_parents(n1->get_root())) {
if (bv.is_int2bv(p->get_expr()) && p->get_sort() == bv2int_arg->get_sort() && p->get_root() != bv2int_arg->get_root()) {
euf::enode_pair_vector eqs;
eqs.push_back({ n1, p->get_arg(0) });
eqs.push_back({ n1, bv2int });
ctx.propagate(p, bv2int_arg, euf::th_explain::propagate(*this, eqs, p, bv2int_arg));
theory_var v1 = get_th_var(p);
theory_var v2 = get_th_var(bv2int_arg);
SASSERT(v1 != euf::null_theory_var);
SASSERT(v2 != euf::null_theory_var);
ctx.propagate(p, bv2int_arg, mk_bv2int_justification(v1, v2, n1, p->get_arg(0), bv2int));
break;
}
}
@ -379,6 +380,11 @@ namespace bv {
r.push_back(b);
break;
}
case bv_justification::kind_t::bv2int: {
ctx.add_antecedent(c.a, c.b);
ctx.add_antecedent(c.a, c.c);
break;
}
}
if (!probing && ctx.use_drat())
log_drat(c);
@ -386,19 +392,26 @@ namespace bv {
void solver::log_drat(bv_justification const& c) {
// introduce dummy literal for equality.
sat::literal leq(s().num_vars() + 1, false);
expr_ref eq(m);
if (c.m_kind != bv_justification::kind_t::bit2ne) {
sat::literal leq1(s().num_vars() + 1, false);
sat::literal leq2(s().num_vars() + 2, false);
expr_ref eq1(m), eq2(m);
if (c.m_kind == bv_justification::kind_t::bv2int) {
eq1 = m.mk_eq(c.a->get_expr(), c.b->get_expr());
eq2 = m.mk_eq(c.a->get_expr(), c.c->get_expr());
ctx.set_tmp_bool_var(leq1.var(), eq1);
ctx.set_tmp_bool_var(leq2.var(), eq1);
}
else if (c.m_kind != bv_justification::kind_t::bit2ne) {
expr* e1 = var2expr(c.m_v1);
expr* e2 = var2expr(c.m_v2);
eq = m.mk_eq(e1, e2);
ctx.set_tmp_bool_var(leq.var(), eq);
eq1 = m.mk_eq(e1, e2);
ctx.set_tmp_bool_var(leq1.var(), eq1);
}
sat::literal_vector lits;
switch (c.m_kind) {
case bv_justification::kind_t::eq2bit:
lits.push_back(~leq);
lits.push_back(~leq1);
lits.push_back(~c.m_antecedent);
lits.push_back(c.m_consequent);
break;
@ -407,10 +420,10 @@ namespace bv {
lits.push_back(c.m_consequent);
break;
case bv_justification::kind_t::bit2eq:
get_antecedents(leq, c.to_index(), lits, true);
get_antecedents(leq1, c.to_index(), lits, true);
for (auto& lit : lits)
lit.neg();
lits.push_back(leq);
lits.push_back(leq1);
break;
case bv_justification::kind_t::bit2ne:
get_antecedents(c.m_consequent, c.to_index(), lits, true);
@ -418,6 +431,14 @@ namespace bv {
lit.neg();
lits.push_back(c.m_consequent);
break;
case bv_justification::kind_t::bv2int:
get_antecedents(leq1, c.to_index(), lits, true);
get_antecedents(leq2, c.to_index(), lits, true);
for (auto& lit : lits)
lit.neg();
lits.push_back(leq1);
lits.push_back(leq2);
break;
}
ctx.get_drat().add(lits, status());
// TBD, a proper way would be to delete the lemma after use.
@ -665,7 +686,9 @@ namespace bv {
return out << "bv <- v" << v1 << "[" << cidx << "] != v" << v2 << "[" << cidx << "] " << m_bits[v1][cidx] << " != " << m_bits[v2][cidx];
}
case bv_justification::kind_t::ne2bit:
return out << "bv <- " << m_bits[v1] << " != " << m_bits[v2] << " @" << cidx;
return out << "bv <- " << m_bits[v1] << " != " << m_bits[v2] << " @" << cidx;
case bv_justification::kind_t::bv2int:
return out << "bv <- v" << v1 << " == v" << v2 << " <== " << ctx.bpp(c.a) << " == " << ctx.bpp(c.b) << " == " << ctx.bpp(c.c);
default:
UNREACHABLE();
break;
@ -818,28 +841,41 @@ namespace bv {
void* mem = get_region().allocate(bv_justification::get_obj_size());
sat::constraint_base::initialize(mem, this);
auto* constraint = new (sat::constraint_base::ptr2mem(mem)) bv_justification(v1, v2, c, a);
return sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
auto jst = sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
TRACE("bv", tout << jst << " " << constraint << "\n");
return jst;
}
sat::ext_justification_idx solver::mk_bit2eq_justification(theory_var v1, theory_var v2) {
void* mem = get_region().allocate(bv_justification::get_obj_size());
sat::constraint_base::initialize(mem, this);
auto* constraint = new (sat::constraint_base::ptr2mem(mem)) bv_justification(v1, v2);
return constraint->to_index();
auto jst = constraint->to_index();
return jst;
}
sat::justification solver::mk_bit2ne_justification(unsigned idx, sat::literal c) {
void* mem = get_region().allocate(bv_justification::get_obj_size());
sat::constraint_base::initialize(mem, this);
auto* constraint = new (sat::constraint_base::ptr2mem(mem)) bv_justification(idx, c);
return sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
auto jst = sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
return jst;
}
sat::justification solver::mk_ne2bit_justification(unsigned idx, theory_var v1, theory_var v2, sat::literal c, sat::literal a) {
void* mem = get_region().allocate(bv_justification::get_obj_size());
sat::constraint_base::initialize(mem, this);
auto* constraint = new (sat::constraint_base::ptr2mem(mem)) bv_justification(idx, v1, v2, c, a);
return sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
auto jst = sat::justification::mk_ext_justification(s().scope_lvl(), constraint->to_index());
return jst;
}
sat::ext_constraint_idx solver::mk_bv2int_justification(theory_var v1, theory_var v2, euf::enode* a, euf::enode* b, euf::enode* c) {
void* mem = get_region().allocate(bv_justification::get_obj_size());
sat::constraint_base::initialize(mem, this);
auto* constraint = new (sat::constraint_base::ptr2mem(mem)) bv_justification(v1, v2, a, b, c);
auto jst = constraint->to_index();
return jst;
}
bool solver::assign_bit(literal consequent, theory_var v1, theory_var v2, unsigned idx, literal antecedent, bool propagate_eqc) {