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#5422

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This commit is contained in:
Nikolaj Bjorner 2021-07-21 07:14:54 -07:00
parent 8a4b292f3e
commit e5e7c510d5
2 changed files with 95 additions and 94 deletions
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188
src/qe/mbp/mbp_plugin.cpp
View file

@ -95,6 +95,97 @@ namespace mbp {
lits.push_back(e);
}
bool project_plugin::reduce(model_evaluator& eval, model& model, expr* fml, expr_ref_vector& fmls) {
expr* nfml, * f1, * f2, * f3;
expr_ref val(m);
if (m.is_not(fml, nfml) && m.is_distinct(nfml))
push_back(fmls, pick_equality(m, model, nfml));
else if (m.is_or(fml)) {
for (expr* arg : *to_app(fml)) {
val = eval(arg);
if (m.is_true(val)) {
fmls.push_back(arg);
break;
}
}
}
else if (m.is_and(fml)) {
fmls.append(to_app(fml)->get_num_args(), to_app(fml)->get_args());
}
else if (m.is_iff(fml, f1, f2) || (m.is_not(fml, nfml) && m.is_xor(nfml, f1, f2))) {
val = eval(f1);
if (m.is_false(val)) {
push_back(fmls, mk_not(m, f1));
push_back(fmls, mk_not(m, f2));
}
else {
push_back(fmls, f1);
push_back(fmls, f2);
}
}
else if (m.is_implies(fml, f1, f2)) {
val = eval(f2);
if (m.is_true(val))
push_back(fmls, f2);
else
push_back(fmls, mk_not(m, f1));
}
else if (m.is_ite(fml, f1, f2, f3)) {
val = eval(f1);
if (m.is_true(val)) {
push_back(fmls, f1);
push_back(fmls, f2);
}
else {
push_back(fmls, mk_not(m, f1));
push_back(fmls, f3);
}
}
else if (m.is_not(fml, nfml) && m.is_not(nfml, nfml)) {
push_back(fmls, nfml);
}
else if (m.is_not(fml, nfml) && m.is_and(nfml)) {
for (expr* arg : *to_app(nfml)) {
val = eval(arg);
if (m.is_false(val)) {
push_back(fmls, mk_not(m, arg));
break;
}
}
}
else if (m.is_not(fml, nfml) && m.is_or(nfml)) {
for (expr* arg : *to_app(nfml))
push_back(fmls, mk_not(m, arg));
}
else if ((m.is_not(fml, nfml) && m.is_iff(nfml, f1, f2)) || m.is_xor(fml, f1, f2)) {
val = eval(f1);
if (m.is_true(val))
f2 = mk_not(m, f2);
else
f1 = mk_not(m, f1);
push_back(fmls, f1);
push_back(fmls, f2);
}
else if (m.is_not(fml, nfml) && m.is_implies(nfml, f1, f2)) {
push_back(fmls, f1);
push_back(fmls, mk_not(m, f2));
}
else if (m.is_not(fml, nfml) && m.is_ite(nfml, f1, f2, f3)) {
val = eval(f1);
if (m.is_true(val)) {
push_back(fmls, f1);
push_back(fmls, mk_not(m, f2));
}
else {
push_back(fmls, mk_not(m, f1));
push_back(fmls, mk_not(m, f3));
}
}
else
return false;
return true;
}
void project_plugin::extract_literals(model& model, app_ref_vector const& vars, expr_ref_vector& fmls) {
m_cache.reset();
m_bool_visited.reset();
@ -105,100 +196,9 @@ namespace mbp {
DEBUG_CODE(for (expr* fml : fmls) { CTRACE("qe", m.is_false(eval(fml)), tout << mk_pp(fml, m) << " is false\n" << model;); SASSERT(!m.is_false(eval(fml))); });
for (unsigned i = 0; i < fmls.size(); ++i) {
expr* fml = fmls.get(i), * nfml, * f1, * f2, * f3;
SASSERT(m.is_bool(fml));
if (m.is_not(fml, nfml) && m.is_distinct(nfml))
fmls[i--] = pick_equality(m, model, nfml);
else if (m.is_or(fml)) {
for (expr* arg : *to_app(fml)) {
val = eval(arg);
if (m.is_true(val)) {
fmls[i] = arg;
--i;
break;
}
}
}
else if (m.is_and(fml)) {
fmls.append(to_app(fml)->get_num_args(), to_app(fml)->get_args());
erase(fmls, i);
}
else if (m.is_iff(fml, f1, f2) || (m.is_not(fml, nfml) && m.is_xor(nfml, f1, f2))) {
val = eval(f1);
if (m.is_false(val)) {
f1 = mk_not(m, f1);
f2 = mk_not(m, f2);
}
fmls[i--] = f1;
push_back(fmls, f2);
}
else if (m.is_implies(fml, f1, f2)) {
val = eval(f2);
if (m.is_true(val)) {
fmls[i] = f2;
}
else {
fmls[i] = mk_not(m, f1);
}
--i;
}
else if (m.is_ite(fml, f1, f2, f3)) {
val = eval(f1);
if (m.is_true(val)) {
push_back(fmls, f1);
push_back(fmls, f2);
}
else {
push_back(fmls, mk_not(m, f1));
push_back(fmls, f3);
}
erase(fmls, i);
}
else if (m.is_not(fml, nfml) && m.is_not(nfml, nfml)) {
push_back(fmls, nfml);
erase(fmls, i);
}
else if (m.is_not(fml, nfml) && m.is_and(nfml)) {
for (expr* arg : *to_app(nfml)) {
val = eval(arg);
if (m.is_false(val)) {
fmls[i--] = mk_not(m, arg);
break;
}
}
}
else if (m.is_not(fml, nfml) && m.is_or(nfml)) {
for (expr* arg : *to_app(nfml))
push_back(fmls, mk_not(m, arg));
erase(fmls, i);
}
else if ((m.is_not(fml, nfml) && m.is_iff(nfml, f1, f2)) || m.is_xor(fml, f1, f2)) {
val = eval(f1);
if (m.is_true(val))
f2 = mk_not(m, f2);
else
f1 = mk_not(m, f1);
push_back(fmls, f1);
push_back(fmls, f2);
erase(fmls, i);
}
else if (m.is_not(fml, nfml) && m.is_implies(nfml, f1, f2)) {
push_back(fmls, f1);
push_back(fmls, mk_not(m, f2));
erase(fmls, i);
}
else if (m.is_not(fml, nfml) && m.is_ite(nfml, f1, f2, f3)) {
val = eval(f1);
if (m.is_true(val)) {
push_back(fmls, f1);
push_back(fmls, mk_not(m, f2));
}
else {
push_back(fmls, mk_not(m, f1));
push_back(fmls, mk_not(m, f3));
}
erase(fmls, i);
}
expr* nfml, * fml = fmls.get(i);
if (reduce(eval, model, fml, fmls))
erase(fmls, i);
else if (m.is_not(fml, nfml))
extract_bools(eval, fmls, i, nfml, false);
else

1
src/qe/mbp/mbp_plugin.h
View file

@ -43,6 +43,7 @@ namespace mbp {
expr_mark m_non_ground;
expr_ref_vector m_cache, m_args, m_pure_eqs;
bool reduce(model_evaluator& eval, model& model, expr* fml, expr_ref_vector& fmls);
void extract_bools(model_evaluator& eval, expr_ref_vector& fmls, unsigned i, expr* fml, bool is_true);
void visit_app(expr* e);
bool visit_ite(model_evaluator& eval, expr* e, expr_ref_vector& fmls);