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fix #3789

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-06 13:57:38 -07:00
parent 5acf4b5968
commit 16be6b9162
2 changed files with 13 additions and 10 deletions
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15
src/qe/qe_arith_plugin.cpp
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@ -1013,6 +1013,14 @@ namespace qe {
return false;
}
bool has_non_zero = false;
for (unsigned i = 1; !has_non_zero && i < values.size(); ++i) {
has_non_zero |= !values[i].is_zero();
}
if (!has_non_zero) {
return false;
}
TRACE("qe", tout << "is linear: " << mk_pp(p, m) << "\n";);
SASSERT(values.size() == num_vars + 1);
SASSERT(num_vars > 0);
@ -1035,7 +1043,7 @@ namespace qe {
if (is_aux) {
// An auxiliary variable was introduced in lieu of 'x'.
// it has coefficient 'm' = values[index].
SASSERT(values[index] >= rational(3));
SASSERT(values[index] >= numeral(3));
z = m.mk_fresh_const("x", s);
add_var(z);
p1 = m_arith.mk_mul(m_arith.mk_numeral(values[index], s), z);
@ -1115,9 +1123,8 @@ namespace qe {
p = todo.back();
todo.pop_back();
if (m_arith.is_add(p)) {
for (unsigned i = 0; i < to_app(p)->get_num_args(); ++i) {
todo.push_back(to_app(p)->get_arg(i));
}
for (expr* arg : *to_app(p))
todo.push_back(arg);
}
else if (m_arith.is_mul(p, e1, e2) &&
m_arith.is_numeral(e1, k) &&