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#5429

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This commit is contained in:
Nikolaj Bjorner 2021-07-31 11:00:12 -07:00
parent e5401a4303
commit 6a9241ff0f
5 changed files with 44 additions and 27 deletions
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20
src/sat/tactic/goal2sat.cpp
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@ -599,8 +599,8 @@ struct goal2sat::imp : public sat::sat_internalizer {
}
void convert_iff(app * t, bool root, bool sign) {
if (t->get_num_args() != 2)
throw default_exception("unexpected number of arguments to xor");
if (t->get_num_args() != 2)
throw default_exception("unexpected number of arguments to " + mk_pp(t, m));
SASSERT(t->get_num_args() == 2);
unsigned sz = m_result_stack.size();
SASSERT(sz >= 2);
@ -608,6 +608,8 @@ struct goal2sat::imp : public sat::sat_internalizer {
sat::literal l2 = m_result_stack[sz-2];
m_result_stack.shrink(sz - 2);
if (root) {
if (m.is_xor(t))
sign = !sign;
SASSERT(sz == 2);
if (sign) {
mk_root_clause(l1, l2);
@ -616,17 +618,20 @@ struct goal2sat::imp : public sat::sat_internalizer {
else {
mk_root_clause(l1, ~l2);
mk_root_clause(~l1, l2);
}
}
}
else {
sat::bool_var k = add_var(false, t);
sat::literal l(k, false);
if (m.is_xor(t))
l1.neg();
mk_clause(~l, l1, ~l2);
mk_clause(~l, ~l1, l2);
mk_clause(l, l1, l2);
mk_clause(l, l1, l2);
mk_clause(l, ~l1, ~l2);
if (aig()) aig()->add_iff(l, l1, l2);
cache(t, m.is_xor(t) ? ~l : l);
if (aig()) aig()->add_iff(l, l1, l2);
cache(t, l);
if (sign)
l.neg();
m_result_stack.push_back(l);
@ -720,7 +725,7 @@ struct goal2sat::imp : public sat::sat_internalizer {
convert_iff(t, root, sign);
break;
case OP_XOR:
convert_iff(t, root, !sign);
convert_iff(t, root, sign);
break;
case OP_IMPLIES:
convert_implies(t, root, sign);
@ -828,6 +833,7 @@ struct goal2sat::imp : public sat::sat_internalizer {
process(n, false, redundant);
SASSERT(m_result_stack.size() == sz + 1);
sat::literal result = m_result_stack.back();
TRACE("goal2sat", tout << "done internalize " << result << " " << mk_bounded_pp(n, m, 2) << "\n";);
m_result_stack.pop_back();
if (!result.sign() && m_map.to_bool_var(n) == sat::null_bool_var) {
force_push();