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deal with subtraction that manages to sneak in. Issue #996

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2017-05-01 15:22:06 -07:00
parent aceee3fac8
commit d14f2af5ae
8 changed files with 84 additions and 47 deletions
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6
src/sat/sat_solver.h
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@ -498,7 +498,11 @@ namespace sat {
void extract_fixed_consequences(unsigned& start, 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 extract_fixed_consequences(literal_set const& unfixed_lits, 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_consequences1(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);