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partial parity fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-02-11 03:35:18 -08:00
parent ba4cc27817
commit b1e6031230
4 changed files with 9 additions and 5 deletions
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5
src/sat/sat_xor_finder.cpp
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@ -61,9 +61,10 @@ namespace sat {
for (literal l : c) {
m_var_position[l.var()] = i;
s.mark_visited(l.var());
parity ^= l.sign();
parity ^= !l.sign();
mask |= (l.sign() << (i++));
}
// parity is number of true literals in clause.
m_clauses_to_remove.reset();
m_clauses_to_remove.push_back(&c);
m_clause.resize(c.size());
@ -108,7 +109,7 @@ namespace sat {
lits.push_back(literal(l.var(), false));
s.set_external(l.var());
}
if (parity) lits[0].neg();
if (parity == (lits.size() % 2 == 0)) lits[0].neg();
m_on_xor(lits);
}