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support or, and, implies, distinct in mbp_basic (#6867)

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Hari Govind V K 2023-08-20 18:36:22 -04:00 • committed by GitHub
parent 37ddaaef69
commit b8d8553c41
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4 changed files with 84 additions and 12 deletions
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92
src/qe/mbp/mbp_basic_tg.cpp
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@ -43,32 +43,106 @@ struct mbp_basic_tg::impl {
void mark_seen(expr *t) { m_seen.mark(t); }
bool is_seen(expr *t) { return m_seen.is_marked(t); }
//Split on all ite terms, irrespective of whether
//they contain variables/are c-ground
// Split on all ite terms, irrespective of whether
// they contain variables/are c-ground
bool apply() {
if (!m_use_mdl) return false;
std::function<bool(expr *)> should_split, is_true, is_false;
if (!m_use_mdl) {
should_split = [&](expr *t) { return m_tg.has_val_in_class(t); };
is_true = [&](expr *t) {
return m_tg.has_val_in_class(t) && m_mdl.is_true(t);
};
is_false = [&](expr *t) {
return m_tg.has_val_in_class(t) && m_mdl.is_false(t);
};
} else {
should_split = [](expr *t) { return true; };
is_true = [&](expr *t) { return m_mdl.is_true(t); };
is_false = [&](expr *t) { return m_mdl.is_false(t); };
}
expr *c, *th, *el;
expr_ref nterm(m);
bool progress = false;
TRACE("mbp_tg", tout << "Iterating over terms of tg";);
// Not resetting terms because get_terms calls resize on terms
m_tg.get_terms(terms, false);
for (expr* term : terms) {
if (is_seen(term))
continue;
if (m.is_ite(term, c, th, el)) {
for (expr *term : terms) {
if (is_seen(term)) continue;
if (m.is_ite(term, c, th, el) && should_split(c)) {
mark_seen(term);
progress = true;
if (m_mdl.is_true(c)) {
m_tg.add_lit(c);
m_tg.add_eq(term, th);
}
else {
} else {
nterm = mk_not(m, c);
m_tg.add_lit(nterm);
m_tg.add_eq(term, el);
}
}
if (m.is_implies(term, c, th)) {
if (is_true(th) || is_false(c)) {
mark_seen(term);
progress = true;
if (is_true(th))
m_tg.add_lit(th);
else if (is_false(c))
m_tg.add_lit(c);
m_tg.add_eq(term, m.mk_true());
} else if (is_true(c) && is_false(th)) {
mark_seen(term);
progress = true;
m_tg.add_eq(term, m.mk_false());
}
}
if (m.is_or(term) || m.is_and(term)) {
bool is_or = m.is_or(term);
app *c = to_app(term);
bool t = is_or ? any_of(*c, is_true) : all_of(*c, is_true);
bool f = is_or ? all_of(*c, is_false) : all_of(*c, is_false);
if (t || f) {
mark_seen(term);
progress = true;
m_tg.add_eq(term, t ? m.mk_true() : m.mk_false());
if (f) {
for (auto a : *c) {
if (is_false(a)) {
m_tg.add_lit(mk_not(m, a));
if (!is_or) break;
}
}
} else {
for (auto a : *c) {
if (is_true(a)) {
m_tg.add_lit(a);
if (is_or) break;
}
}
}
}
}
if (m_use_mdl && m.is_distinct(term)) {
mark_seen(term);
progress = true;
bool eq = false;
app *c = to_app(term);
for (auto a1 : *c) {
for (auto a2 : *c) {
if (a1 == a2) continue;
if (m_mdl.are_equal(a1, a2)) {
m_tg.add_eq(a1, a2);
eq = true;
break;
} else
m_tg.add_deq(a1, a2);
}
}
if (eq)
m_tg.add_eq(term, m.mk_false());
else
m_tg.add_eq(term, m.mk_true());
}
}
return progress;
}