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fix boolean propagation

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This commit is contained in:
Jakob Rath 2023-02-20 09:39:44 +01:00
parent 2c44018a8a
commit 4501a372b1
1 changed files with 21 additions and 6 deletions
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27
src/math/polysat/solver.cpp
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@ -331,6 +331,7 @@ namespace polysat {
* Return true if a new watch was found; or false to keep the existing one.
*/
bool solver::propagate(sat::literal lit, clause& cl) {
// scoped_set_log_enabled _enable(true);
#if 0
LOG_H3("Propagate " << lit << " into " << cl);
for (sat::literal l : cl) {
@ -343,20 +344,34 @@ namespace polysat {
SASSERT(cl[1 - idx] == ~lit);
if (m_bvars.is_true(cl[idx]))
return false;
unsigned i = 2;
for (; i < cl.size() && m_bvars.is_false(cl[i]); ++i);
if (i < cl.size()) {
// found non-false literal in cl; watch it instead
// Find a new watched literal:
// - non-false literal (as usual)
// - false literal, propagated at higher level than lit
// (may happen if a clause has been generated that propagated lit at a lower than current level)
unsigned i = cl.size();
uint64_t i_lvl = m_bvars.level(lit);
for (unsigned j = 2; j < cl.size(); ++j) {
uint64_t j_lvl = m_bvars.get_watch_level(cl[j]);
if (i_lvl < j_lvl) {
i = j;
i_lvl = j_lvl;
}
}
bool const updated_watch = i < cl.size();
if (updated_watch) {
// found better watch literal in cl; watch it instead
m_bvars.watch(cl[i]).push_back(&cl);
// LOG("Found new watch: " << cl[i]);
std::swap(cl[1 - idx], cl[i]);
return true;
if (!m_bvars.is_false(cl[1 - idx]))
return true;
}
// all literals in cl are false, except possibly the other watch cl[idx]
if (m_bvars.is_false(cl[idx]))
set_conflict(cl);
else
assign_propagate(cl[idx], cl);
return false;
return updated_watch;
}
void solver::linear_propagate() {