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only assign, if there isn't already a true literal incube/clause mode

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-07-09 10:33:56 -07:00
parent efe440839e
commit 8373bec6ad
1 changed files with 9 additions and 4 deletions
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13
src/smt/smt_context.cpp
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@ -3186,6 +3186,7 @@ namespace smt {
if (m_tmp_clauses.empty()) return l_true;
for (auto & tmp_clause : m_tmp_clauses) {
literal_vector& lits = tmp_clause.second;
literal unassigned = null_literal;
for (literal l : lits) {
switch (get_assignment(l)) {
case l_false:
@ -3193,13 +3194,17 @@ namespace smt {
case l_true:
goto next_clause;
default:
shuffle(lits.size(), lits.c_ptr(), m_random);
push_scope();
assign(l, b_justification::mk_axiom(), true);
return l_undef;
unassigned = l;
}
}
if (unassigned != null_literal) {
shuffle(lits.size(), lits.c_ptr(), m_random);
push_scope();
assign(unassigned, b_justification::mk_axiom(), true);
return l_undef;
}
if (lits.size() == 1) {
set_conflict(b_justification(), ~lits[0]);
}