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fix bug in consequence extraction: the order of bcp is not fixed between restarts, so the order of unit literals may not be preserved. This is relatively rare, so we optimize for the case where we assume bcp preserves order (and maybe miss some consequences)

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-01-17 13:41:15 -08:00
parent dc543a7ee7
commit 873d975c77
2 changed files with 27 additions and 7 deletions
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6
src/sat/sat_solver.h
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@ -439,7 +439,9 @@ namespace sat {
u_map<index_set> m_antecedents;
vector<literal_vector> m_binary_clause_graph;
void extract_assumptions(literal lit, index_set& s);
bool extract_assumptions(literal lit, index_set& s);
bool check_domain(literal lit, literal lit2);
std::ostream& display_index_set(std::ostream& out, index_set const& s) const;
@ -451,7 +453,7 @@ namespace sat {
void extract_fixed_consequences(unsigned& start, literal_set const& assumptions, bool_var_set& unfixed, vector<literal_vector>& conseq);
void extract_fixed_consequences(literal lit, literal_set const& assumptions, bool_var_set& unfixed, vector<literal_vector>& conseq);
bool extract_fixed_consequences(literal lit, literal_set const& assumptions, bool_var_set& unfixed, vector<literal_vector>& conseq);
void update_unfixed_literals(literal_set& unfixed_lits, bool_var_set& unfixed_vars);