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add don't care option

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-01-12 17:00:05 -08:00
parent e0a41a18c3
commit 9f964be3f4
7 changed files with 201 additions and 98 deletions
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34
src/sat/sat_aig_simplifier.h
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@ -27,13 +27,20 @@ namespace sat {
public:
struct stats {
unsigned m_num_eqs, m_num_units, m_num_cuts, m_num_xors, m_num_ands, m_num_ites;
unsigned m_num_calls;
unsigned m_num_calls, m_num_dont_care_reductions;
stats() { reset(); }
void reset() { memset(this, 0, sizeof(*this)); }
};
struct config {
bool m_full;
config():m_full(false) {}
bool m_validate;
bool m_enable_units;
bool m_enable_dont_cares;
bool m_add_learned;
config():
m_validate(false),
m_enable_units(false),
m_enable_dont_cares(false),
m_add_learned(true) {}
};
private:
struct report;
@ -60,14 +67,16 @@ namespace sat {
* Apply the masks on cut sets so to allow detecting
* equivalences modulo implications.
*/
enum op_code { pp, pn, np, nn, none };
struct var_pair {
unsigned u, v;
uint64_t masks[35];
static unsigned size() { return sizeof(uint64_t)*35; }
var_pair(unsigned u, unsigned v): u(u), v(v) {
op_code op;
var_pair(unsigned _u, unsigned _v): u(_u), v(_v), op(none) {
if (u > v) std::swap(u, v);
}
var_pair(): u(UINT_MAX), v(UINT_MAX) {}
var_pair(): u(UINT_MAX), v(UINT_MAX), op(none) {}
struct hash {
unsigned operator()(var_pair const& p) const {
@ -82,10 +91,13 @@ namespace sat {
};
hashtable<var_pair, var_pair::hash, var_pair::eq> m_pairs;
void collect_pairs(vector<cut_set> const& cuts);
void add_mask(literal u, literal v, var_pair& p);
void add_masks_to_pairs();
void apply_masks();
void add_dont_cares(vector<cut_set> const& cuts);
void cuts2pairs(vector<cut_set> const& cuts);
void pairs2dont_cares();
void dont_cares2cuts(vector<cut_set> const& cuts);
bool rewrite_cut(cut const& c, cut& r);
uint64_t op2dont_care(unsigned i, unsigned j, var_pair const& p);
public:
aig_simplifier(solver& s);
~aig_simplifier();