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fix xor processing

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-01-13 19:53:50 -08:00
parent 7e0920e362
commit 3047d930e1
3 changed files with 46 additions and 36 deletions
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10
src/sat/tactic/goal2sat.cpp
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@ -392,11 +392,15 @@ struct goal2sat::imp {
return;
}
sat::literal_vector lits;
convert_pb_args(num, lits);
sat::bool_var v = m_solver.mk_var(true);
lits.push_back(sat::literal(v, true));
convert_pb_args(num, lits);
// ensure that = is converted to xor
for (unsigned i = 1; i + 1 < lits.size(); ++i) {
lits[i].neg();
}
ensure_extension();
if (lits.size() % 2 == 0) lits[0].neg();
m_ext->add_xor(v, lits);
m_ext->add_xor(lits);
sat::literal lit(v, sign);
if (root) {
m_result_stack.reset();