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fixes for #6577

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- the literal false should not appear in clauses
- the literal true forces a tautology
- fix early return in is_cnf check. It should check all clauses for nested Booleans.
This commit is contained in:
Nikolaj Bjorner 2023-02-11 09:32:53 -08:00
parent d22e4aa525
commit 46c8d78ece
3 changed files with 16 additions and 13 deletions
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19
src/tactic/goal.cpp
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@ -692,28 +692,23 @@ bool goal::is_cnf() const {
for (unsigned i = 0; i < size(); i++) {
expr * f = form(i);
if (m_manager.is_or(f)) {
for (expr* lit : *to_app(f)) {
if (!is_literal(lit)) {
for (expr* lit : *to_app(f))
if (!is_literal(lit))
return false;
}
}
return true;
}
if (!is_literal(f)) {
if (!is_literal(f))
return false;
}
}
return true;
}
bool goal::is_literal(expr* f) const {
m_manager.is_not(f, f);
if (!is_app(f)) return false;
if (to_app(f)->get_family_id() == m_manager.get_basic_family_id()) {
if (!is_app(f))
return false;
if (to_app(f)->get_family_id() == m_manager.get_basic_family_id())
for (expr* arg : *to_app(f))
if (m_manager.is_bool(arg)) {
if (m_manager.is_bool(arg))
return false;
}
}
return true;
}