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quantifiers and a heuristic for disequalities

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2012-11-27 15:34:02 -08:00
parent e2198f6541
commit 1d9b090196
2 changed files with 37 additions and 40 deletions
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16
src/muz_qe/pdr_util.cpp
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@ -219,11 +219,21 @@ namespace pdr {
collect(formulas, tocollect);
for (unsigned i = 0; i < tocollect.size(); ++i) {
expr* e = tocollect[i];
expr* e1, *e2;
SASSERT(m.is_bool(e));
SASSERT(is_true(e) || is_false(e));
if (is_true(e)) {
result.push_back(e);
}
// hack to break disequalities for arithmetic variables.
else if (m.is_eq(e, e1, e2) && m_arith.is_int_real(e1)) {
if (get_number(e1) < get_number(e2)) {
result.push_back(m_arith.mk_lt(e1,e2));
}
else {
result.push_back(m_arith.mk_lt(e2,e1));
}
}
else {
result.push_back(m.mk_not(e));
}
@ -260,11 +270,11 @@ namespace pdr {
SASSERT(v);
// no-op
}
else if (!m.is_bool(args[0])) {
tocollect.push_back(e);
else if (m.is_bool(args[0])) {
todo.append(sz, args);
}
else {
todo.append(sz, args);
tocollect.push_back(e);
}
break;
case OP_DISTINCT: