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Propagation must be justified by a prefix of Gamma

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This commit is contained in:
Jakob Rath 2022-11-22 13:42:31 +01:00
parent 33ea8d6e57
commit a144a09ede
4 changed files with 34 additions and 1 deletions
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21
src/math/polysat/viable.cpp
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@ -132,7 +132,7 @@ namespace polysat {
rational val;
switch (find_viable(v, val)) {
case dd::find_t::singleton:
s.assign_propagate(v, val);
propagate(v, val);
prop = true;
break;
case dd::find_t::empty:
@ -150,6 +150,24 @@ namespace polysat {
return prop;
}
void viable::propagate(pvar v, rational const& val) {
// NOTE: all propagations must be justified by a prefix of \Gamma,
// otherwise dependencies may be missed during conflict resolution.
// The propagation reason for v := val consists of the following constraints:
// - source constraint (already on \Gamma)
// - side conditions
// - i.lo() == i.lo_val() for each unit interval i
// - i.hi() == i.hi_val() for each unit interval i
for (auto const& c : get_constraints(v)) {
s.try_assign_eval(c);
}
for (auto const& i : units(v)) {
s.try_assign_eval(s.eq(i.lo(), i.lo_val()));
s.try_assign_eval(s.eq(i.hi(), i.hi_val()));
}
s.assign_propagate(v, val);
}
bool viable::intersect(pvar v, signed_constraint const& c) {
entry* ne = alloc_entry();
if (!m_forbidden_intervals.get_interval(c, v, *ne)) {
@ -187,6 +205,7 @@ namespace polysat {
}
bool viable::intersect(pvar v, entry* ne) {
SASSERT(!s.is_assigned(v));
entry* e = m_units[v];
if (e && e->interval.is_full()) {
m_alloc.push_back(ne);