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Don't do complicated stuff in report_unsat, instead don't skip resolutions that we should not skip.

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This commit is contained in:
Jakob Rath 2023-03-17 21:09:52 +01:00
parent 6bbfdb5289
commit 28716d1e67
1 changed files with 12 additions and 5 deletions
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17
src/math/polysat/solver.cpp
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@ -984,7 +984,7 @@ namespace polysat {
report_unsat();
return;
}
continue;
// continue;
}
if (j.is_decision()) {
m_conflict.revert_pvar(v);
@ -1007,11 +1007,11 @@ namespace polysat {
// NOTE: the levels of boolean literals on the stack aren't always ordered by level (cf. replay functionality in pop_levels).
// Thus we can only skip base level literals here, instead of aborting the loop.
if (m_bvars.level(var) <= base_level()) {
if (m_bvars.is_decision(var)) {
if (m_bvars.is_decision(var) || m_bvars.is_assumption(var)) {
report_unsat(); // decisions are always in order
return;
}
continue;
// continue;
}
SASSERT(!m_bvars.is_assumption(var)); // TODO: "assumption" is basically "propagated by unit clause" (or "at base level"); except we do not explicitly store the unit clause.
if (m_bvars.is_decision(var)) {
@ -1523,17 +1523,24 @@ namespace polysat {
}
void solver::report_unsat() {
#if 0
// NOTE: backjump may destroy dependencies of the conflict (e.g., lose boolean propagations).
// so we reset the conflict, backjump, then propagate to restore the conflicts
clause_ref confl = m_conflict.build_lemma();
LOG("confl: " << show_deref(confl));
m_conflict.reset();
backjump(base_level());
propagate_clause(*confl);
propagate();
if (!is_conflict())
add_clause(confl);
VERIFY(!m_conflict.empty());
if (!is_conflict()) {
LOG("confl: " << show_deref(confl));
LOG("state:\n" << *this);
}
#else
backjump(base_level());
#endif
VERIFY(is_conflict());
}
void solver::unsat_core(dependency_vector& deps) {