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added updated bounds propagation

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-12-23 12:47:17 -08:00
parent 6f8fb39bc9
commit 9fefa0040f
3 changed files with 59 additions and 2 deletions
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11
src/math/polysat/saturation.cpp
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@ -1199,6 +1199,10 @@ namespace polysat {
* - then index on patterns or features of literals?
*/
bool saturation::has_upper_bound(pvar x, conflict& core, rational& bound, signed_constraint& x_le_bound) {
bool found = s.m_viable.has_upper_bound(x, bound, x_le_bound);
verbose_stream() << "found " << found << "\n";
auto& m = s.var2pdd(x);
pdd y = s.var(x);
for (auto const& c : core) {
@ -1223,6 +1227,10 @@ namespace polysat {
}
bool saturation::has_lower_bound(pvar x, conflict& core, rational& bound, signed_constraint& x_ge_bound) {
bool found = s.m_viable.has_lower_bound(x, bound, x_ge_bound);
verbose_stream() << "found " << found << "\n";
auto& m = s.var2pdd(x);
pdd y = s.var(x);
for (auto const& c : core) {
@ -1314,10 +1322,9 @@ namespace polysat {
pdd b = a, c = a, y = a;
rational b_val, c_val, y_val, x_bound;
signed_constraint x_ge_bound, x_le_bound, b_bound, ax_bound;
if (is_AxB_l_Y(x, a_l_b, a, b, y) && y.is_val() && s.try_eval(b, b_val) && !y.is_zero() && !a.is_val()) {
if (is_AxB_l_Y(x, a_l_b, a, b, y) && s.try_eval(y, y_val) && s.try_eval(b, b_val) && !y_val.is_zero() && !a.is_val()) {
verbose_stream() << a_l_b << " a " << a << " b " << b << " := " << dd::val_pp(m, b_val, false) << " y " << y << "\n";
SASSERT(!a.is_zero());
y_val = y.val();
// define c := -b
c = -b;