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adding BDD-based variable elimination routine

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-10-14 15:12:02 -07:00
parent 09fdfcc963
commit d36406f845
8 changed files with 372 additions and 3 deletions
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7
src/sat/sat_bdd.h
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@ -34,6 +34,7 @@ namespace sat {
bdd(int root, bdd_manager* m);
public:
bdd(bdd & other);
bdd& operator=(bdd const& other);
~bdd();
bdd lo() const;
bdd hi() const;
@ -44,6 +45,8 @@ namespace sat {
bdd operator!();
bdd operator&&(bdd const& other);
bdd operator||(bdd const& other);
bdd operator|=(bdd const& other) { return *this = *this || other; }
bdd operator&=(bdd const& other) { return *this = *this && other; }
std::ostream& display(std::ostream& out) const;
bool operator==(bdd const& other) const { return root == other.root; }
bool operator!=(bdd const& other) const { return root != other.root; }
@ -190,9 +193,13 @@ namespace sat {
bdd mk_var(unsigned i);
bdd mk_nvar(unsigned i);
bdd mk_true() { return bdd(true_bdd, this); }
bdd mk_false() { return bdd(false_bdd, this); }
bdd mk_not(bdd b);
bdd mk_exists(unsigned n, unsigned const* vars, bdd const & b);
bdd mk_forall(unsigned n, unsigned const* vars, bdd const & b);
bdd mk_exists(unsigned v, bdd const& b) { return mk_exists(1, &v, b); }
bdd mk_forall(unsigned v, bdd const& b) { return mk_forall(1, &v, b); }
bdd mk_and(bdd const& a, bdd const& b) { return bdd(apply(a.root, b.root, bdd_and_op), this); }
bdd mk_or(bdd const& a, bdd const& b) { return bdd(apply(a.root, b.root, bdd_or_op), this); }
bdd mk_iff(bdd const& a, bdd const& b) { return bdd(apply(a.root, b.root, bdd_iff_op), this); }