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prepare ground for drup trim

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By not deleting justifications in base level unit literals it is possible for drup-trim to inspect the trail for dependencies - which clauses were used to derive a literal.
This commit is contained in:
Nikolaj Bjorner 2022-06-12 10:45:39 -07:00
parent 35d4605425
commit 25ad5cb073
2 changed files with 3 additions and 3 deletions
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2
src/sat/sat_drat.cpp
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@ -802,7 +802,7 @@ namespace sat {
//
// placeholder for trim function.
// 1. forward pass replaying propositional proof, populate trail stack.
// 1. trail contains justification for the empty clause.
// 2. backward pass to prune.
//
svector<std::pair<clause&, status>> drat::trim() {

4
src/sat/sat_solver.cpp
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@ -945,8 +945,8 @@ namespace sat {
if (j.level() == 0) {
if (m_config.m_drat)
drat_log_unit(l, j);
j = justification(0); // erase justification for level 0
if (!m_config.m_drup_trim)
j = justification(0); // erase justification for level 0
}
else {
VERIFY(!at_base_lvl());