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add hooks for multiplication overflow

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-12-23 15:48:03 -08:00
parent d18a2427a4
commit 4e0604bc22
3 changed files with 72 additions and 5 deletions
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3
src/math/polysat/viable.cpp
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@ -675,7 +675,6 @@ namespace polysat {
return !out_c.empty();
}
// TBD: generalize to multiple intervals similar to upper bound
bool viable::has_lower_bound(pvar v, rational& out_lo, vector<signed_constraint>& out_c) {
entry const* first = m_units[v];
entry const* e = first;
@ -688,7 +687,7 @@ namespace polysat {
auto const& lo = e->interval.lo();
auto const& hi = e->interval.hi();
if (lo.is_val() && hi.is_val()) {
if (out_c.empty() && (lo.val() == 0 || lo.val() > hi.val())) {
if (out_c.empty() && hi.val() != 0 && (lo.val() == 0 || lo.val() > hi.val())) {
out_c.push_back(e->src);
out_lo = hi.val();
found = true;