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Simplify

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This commit is contained in:
Jakob Rath 2022-11-23 15:11:27 +01:00
parent f51d5c2fe9
commit bef1b9b429
1 changed files with 17 additions and 16 deletions
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25
src/math/polysat/solver.cpp
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@ -896,27 +896,28 @@ namespace polysat {
// We must do so before backjump() when the search stack is still intact. // We must do so before backjump() when the search stack is still intact.
lemma_score best_score = lemma_score::max(); lemma_score best_score = lemma_score::max();
clause* best_lemma = nullptr; clause* best_lemma = nullptr;
for (clause* lemma : lemmas) {
auto appraise_lemma = [&](clause* lemma) {
m_simplify_clause.apply(*lemma); m_simplify_clause.apply(*lemma);
auto score = compute_lemma_score(*lemma); auto score = compute_lemma_score(*lemma);
if (!score) if (score && *score < best_score) {
continue;
if (*score < best_score) {
best_score = *score; best_score = *score;
best_lemma = lemma; best_lemma = lemma;
} }
} };
// In case no (good) lemma has been found, build the fallback lemma from the conflict state.
for (clause* lemma : lemmas)
appraise_lemma(lemma);
if (!best_lemma || best_score.jump_level() > max_jump_level) { if (!best_lemma || best_score.jump_level() > max_jump_level) {
// No (good) lemma has been found, so build the fallback lemma from the conflict state.
lemmas.push_back(m_conflict.build_lemma()); lemmas.push_back(m_conflict.build_lemma());
clause* lemma = lemmas.back(); appraise_lemma(lemmas.back());
m_simplify_clause.apply(*lemma);
auto score = compute_lemma_score(*lemma);
SASSERT(score);
best_score = *score;
best_lemma = lemma;
} }
SASSERT(best_score < lemma_score::max());
SASSERT(best_lemma);
unsigned const jump_level = best_score.jump_level(); unsigned const jump_level = best_score.jump_level();
SASSERT(jump_level <= max_jump_level);
m_conflict.reset(); m_conflict.reset();
backjump(jump_level); backjump(jump_level);