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clarify unsat_core

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This commit is contained in:
Jakob Rath 2023-02-06 16:33:27 +01:00
parent c79a16db2a
commit a37536e0ae
4 changed files with 27 additions and 15 deletions
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20
src/math/polysat/conflict.cpp
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@ -509,6 +509,7 @@ namespace polysat {
indexed_uint_set deps;
LOG("Conflict: " << *this);
SASSERT(s.at_base_level());
auto const enqueue_lit = [&](sat::literal lit) {
if (done_lits.contains(lit))
@ -543,9 +544,7 @@ namespace polysat {
pvar const v = todo_vars.back();
todo_vars.pop_back();
if (s.m_justification[v].is_decision())
continue;
SASSERT(s.m_justification[v].is_propagation());
SASSERT(s.m_justification[v].is_propagation()); // no decisions at base level
for (signed_constraint c : s.m_viable.get_constraints(v))
enqueue_constraint(c);
@ -558,14 +557,12 @@ namespace polysat {
sat::literal const lit = todo_lits.back();
todo_lits.pop_back();
dependency const d = s.m_bvars.dep(lit);
if (!d.is_null())
deps.insert(d.val());
if (s.m_bvars.is_decision(lit))
continue;
else if (s.m_bvars.is_assumption(lit))
continue;
if (s.m_bvars.is_assumption(lit)) {
// only assumptions have external dependencies
dependency const d = s.m_bvars.dep(lit);
if (!d.is_null())
deps.insert(d.val());
}
else if (s.m_bvars.is_bool_propagation(lit)) {
for (sat::literal other : *s.m_bvars.reason(lit))
enqueue_lit(other);
@ -581,6 +578,7 @@ namespace polysat {
}
}
else {
// no decisions at base level
UNREACHABLE();
}
}