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remaining issue fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-04-01 10:30:49 -07:00
parent 63ebd4fcba
commit 7b60c37ad8
4 changed files with 34 additions and 15 deletions
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19
src/math/polysat/constraint_manager.cpp
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@ -148,8 +148,9 @@ namespace polysat {
s.m_bvars.watch(cl[0]).push_back(&cl);
s.m_bvars.watch(cl[1]).push_back(&cl);
if (s.m_bvars.is_true(cl[0]))
return false;
if (s.m_bvars.is_true(cl[0]))
return !is_chronological(cl);
SASSERT(!s.m_bvars.is_true(cl[1]));
if (!s.m_bvars.is_false(cl[1])) {
SASSERT(!s.m_bvars.is_assigned(cl[0]) && !s.m_bvars.is_assigned(cl[1]));
@ -169,6 +170,20 @@ namespace polysat {
s.m_bvars.watch(cl[1]).erase(&cl);
}
// return false if the level of cl[0] is above the level of all
// other literals in cl. In this case cl[0] is obtained by unit propagation
// at a lower level.
bool constraint_manager::is_chronological(clause const& cl) const {
unsigned level = s.m_bvars.level(cl[0]);
for (unsigned i = 1; i < cl.size(); ++i) {
if (!s.m_bvars.is_false(cl[i]))
return true;
if (level <= s.m_bvars.level(cl[i]))
return true;
}
return false;
}
constraint_manager::~constraint_manager() {
// Release explicitly to check for leftover references in debug mode,
// and to make sure all constraints are destructed before the bvar->constraint mapping.