276 lines
8.2 KiB
C
276 lines
8.2 KiB
C
|
/**************************************************************************************************
|
||
|
|
Originally From: Solver.C -- (C) Niklas Een, Niklas Sorensson, 2004
|
||
|
|
Substantially modified by: Mate Soos (2010)
|
||
|
|
**************************************************************************************************/
|
||
|
|
|
||
|
|
#ifndef SIMPLIFIER_H
|
||
|
|
#define SIMPLIFIER_H
|
||
|
|
|
||
|
|
#include "Solver.h"
|
||
|
|
#include "Queue.h"
|
||
|
|
#include "CSet.h"
|
||
|
|
#include "BitArray.h"
|
||
|
|
#include <map>
|
||
|
|
#include <vector>
|
||
|
|
#include <queue>
|
||
|
|
using std::vector;
|
||
|
|
using std::map;
|
||
|
|
using std::priority_queue;
|
||
|
|
|
||
|
|
class ClauseCleaner;
|
||
|
|
|
||
|
|
class Subsumer
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
//Construct-destruct
|
||
|
|
Subsumer(Solver& S2);
|
||
|
|
~Subsumer();
|
||
|
|
|
||
|
|
//Called from main
|
||
|
|
const bool simplifyBySubsumption();
|
||
|
|
const bool subsumeWithBinaries(const bool startUp);
|
||
|
|
void newVar();
|
||
|
|
|
||
|
|
//Used by cleaner
|
||
|
|
void unlinkModifiedClause(vec<Lit>& origClause, ClauseSimp c);
|
||
|
|
void unlinkModifiedClauseNoDetachNoNULL(vec<Lit>& origClause, ClauseSimp c);
|
||
|
|
void unlinkClause(ClauseSimp cc, Var elim = var_Undef);
|
||
|
|
ClauseSimp linkInClause(Clause& cl);
|
||
|
|
void linkInAlreadyClause(ClauseSimp& c);
|
||
|
|
void updateClause(ClauseSimp c);
|
||
|
|
|
||
|
|
|
||
|
|
//UnElimination
|
||
|
|
void extendModel(Solver& solver2);
|
||
|
|
const bool unEliminate(const Var var);
|
||
|
|
|
||
|
|
|
||
|
|
//Get-functions
|
||
|
|
const vec<char>& getVarElimed() const;
|
||
|
|
const uint32_t getNumElimed() const;
|
||
|
|
const bool checkElimedUnassigned() const;
|
||
|
|
const double getTotalTime() const;
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
friend class ClauseCleaner;
|
||
|
|
|
||
|
|
//Main
|
||
|
|
vec<ClauseSimp> clauses;
|
||
|
|
CSet learntClauses;
|
||
|
|
vec<char> touched; // Is set to true when a variable is part of a removed clause. Also true initially (upon variable creation).
|
||
|
|
vec<Var> touched_list; // A list of the true elements in 'touched'.
|
||
|
|
CSet cl_touched; // Clauses strengthened.
|
||
|
|
CSet cl_added; // Clauses created.
|
||
|
|
vec<vec<ClauseSimp> > occur; // 'occur[index(lit)]' is a list of constraints containing 'lit'.
|
||
|
|
vec<vec<ClauseSimp>* > iter_vecs; // Vectors currently used for iterations. Removed clauses will be looked up and replaced by 'Clause_NULL'.
|
||
|
|
vec<CSet* > iter_sets; // Sets currently used for iterations.
|
||
|
|
vec<char> cannot_eliminate;//
|
||
|
|
|
||
|
|
//Global stats
|
||
|
|
Solver& solver;
|
||
|
|
vec<char> var_elimed; //TRUE if var has been eliminated
|
||
|
|
double totalTime;
|
||
|
|
uint32_t numElimed;
|
||
|
|
map<Var, vector<Clause*> > elimedOutVar;
|
||
|
|
|
||
|
|
// Temporaries (to reduce allocation overhead):
|
||
|
|
//
|
||
|
|
vec<char> seen_tmp; // (used in various places)
|
||
|
|
|
||
|
|
|
||
|
|
//Limits
|
||
|
|
uint32_t numVarsElimed;
|
||
|
|
uint32_t numMaxSubsume1;
|
||
|
|
uint32_t numMaxSubsume0;
|
||
|
|
uint32_t numMaxElim;
|
||
|
|
int64_t numMaxBlockToVisit;
|
||
|
|
uint32_t numMaxBlockVars;
|
||
|
|
|
||
|
|
//Start-up
|
||
|
|
template<bool UseCL>
|
||
|
|
void addFromSolver(vec<Clause*>& cs, bool alsoLearnt = false);
|
||
|
|
void addBackToSolver();
|
||
|
|
void removeWrong(vec<Clause*>& cs);
|
||
|
|
void removeAssignedVarsFromEliminated();
|
||
|
|
void fillCannotEliminate();
|
||
|
|
const bool treatLearnts();
|
||
|
|
void clearAll();
|
||
|
|
|
||
|
|
//Iterations
|
||
|
|
void registerIteration (CSet& iter_set) { iter_sets.push(&iter_set); }
|
||
|
|
void unregisterIteration(CSet& iter_set) { remove(iter_sets, &iter_set); }
|
||
|
|
void registerIteration (vec<ClauseSimp>& iter_vec) { iter_vecs.push(&iter_vec); }
|
||
|
|
void unregisterIteration(vec<ClauseSimp>& iter_vec) { remove(iter_vecs, &iter_vec); }
|
||
|
|
|
||
|
|
// Subsumption:
|
||
|
|
void touch(const Var x);
|
||
|
|
void touch(const Lit p);
|
||
|
|
template<class T>
|
||
|
|
void findSubsumed(const T& ps, const uint32_t abst, vec<ClauseSimp>& out_subsumed);
|
||
|
|
bool isSubsumed(Clause& ps);
|
||
|
|
template<class T>
|
||
|
|
uint32_t subsume0(T& ps, uint32_t abs);
|
||
|
|
template<class T>
|
||
|
|
uint32_t subsume0Orig(const T& ps, uint32_t abs);
|
||
|
|
void subsume0BIN(const Lit lit, const vec<char>& lits);
|
||
|
|
void subsume0LearntSet(vec<Clause*>& cs);
|
||
|
|
void subsume1(ClauseSimp& ps);
|
||
|
|
void smaller_database();
|
||
|
|
void almost_all_database();
|
||
|
|
template<class T1, class T2>
|
||
|
|
bool subset(const T1& A, const T2& B);
|
||
|
|
bool subsetAbst(uint32_t A, uint32_t B);
|
||
|
|
|
||
|
|
void orderVarsForElim(vec<Var>& order);
|
||
|
|
int substitute(Lit x, Clause& def, vec<Clause*>& poss, vec<Clause*>& negs, vec<Clause*>& new_clauses);
|
||
|
|
bool maybeEliminate(Var x);
|
||
|
|
void MigrateToPsNs(vec<ClauseSimp>& poss, vec<ClauseSimp>& negs, vec<ClauseSimp>& ps, vec<ClauseSimp>& ns, const Var x);
|
||
|
|
void DeallocPsNs(vec<ClauseSimp>& ps, vec<ClauseSimp>& ns);
|
||
|
|
bool merge(const Clause& ps, const Clause& qs, const Lit without_p, const Lit without_q, vec<Lit>& out_clause);
|
||
|
|
|
||
|
|
//Subsume with Nonexistent Bins
|
||
|
|
const bool subsWNonExistBinsFull(const bool startUp);
|
||
|
|
const bool subsWNonExistBins(const Lit& lit, const bool startUp);
|
||
|
|
template<class T>
|
||
|
|
void subsume1Partial(const T& ps);
|
||
|
|
uint32_t subsNonExistentNum;
|
||
|
|
uint32_t subsNonExistentumFailed;
|
||
|
|
bool subsNonExistentFinish;
|
||
|
|
double subsNonExistentTime;
|
||
|
|
uint32_t subsNonExistentLitsRemoved;
|
||
|
|
vec<Clause*> addBinaryClauses;
|
||
|
|
uint32_t doneNum;
|
||
|
|
vec<ClauseSimp> subsume1PartialSubs;
|
||
|
|
vec<Lit> subsume1PartialQs;
|
||
|
|
vec<Lit> toVisit;
|
||
|
|
vec<char> toVisitAll;
|
||
|
|
vec<Lit> ps2;
|
||
|
|
|
||
|
|
//hyperBinRes
|
||
|
|
void addFromSolverAll(vec<Clause*>& cs);
|
||
|
|
const bool hyperBinRes();
|
||
|
|
const bool hyperUtility(vec<ClauseSimp>& iter, const Lit lit, BitArray& inside, vec<Clause*>& addToClauses);
|
||
|
|
|
||
|
|
//merging
|
||
|
|
//vector<char> merge();
|
||
|
|
//const bool checkIfSame(const Lit var1, const Lit var2);
|
||
|
|
|
||
|
|
class VarOcc {
|
||
|
|
public:
|
||
|
|
VarOcc(const Var& v, const uint32_t num) :
|
||
|
|
var(v)
|
||
|
|
, occurnum(num)
|
||
|
|
{}
|
||
|
|
Var var;
|
||
|
|
uint32_t occurnum;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct MyComp {
|
||
|
|
const bool operator() (const VarOcc& l1, const VarOcc& l2) const {
|
||
|
|
return l1.occurnum > l2.occurnum;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
void blockedClauseRemoval();
|
||
|
|
const bool allTautology(const vec<Lit>& ps, const Lit lit);
|
||
|
|
uint32_t numblockedClauseRemoved;
|
||
|
|
const bool tryOneSetting(const Lit lit, const Lit negLit);
|
||
|
|
priority_queue<VarOcc, vector<VarOcc>, MyComp> touchedBlockedVars;
|
||
|
|
vec<bool> touchedBlockedVarsBool;
|
||
|
|
void touchBlockedVar(const Var x);
|
||
|
|
double blockTime;
|
||
|
|
|
||
|
|
|
||
|
|
//validity checking
|
||
|
|
void verifyIntegrity();
|
||
|
|
|
||
|
|
uint32_t clauses_subsumed;
|
||
|
|
uint32_t literals_removed;
|
||
|
|
uint32_t origNClauses;
|
||
|
|
uint32_t numCalls;
|
||
|
|
bool fullSubsume;
|
||
|
|
uint32_t clauseID;
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class T, class T2>
|
||
|
|
void maybeRemove(vec<T>& ws, const T2& elem)
|
||
|
|
{
|
||
|
|
if (ws.size() > 0)
|
||
|
|
removeW(ws, elem);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Subsumer::touch(const Var x)
|
||
|
|
{
|
||
|
|
if (!touched[x]) {
|
||
|
|
touched[x] = 1;
|
||
|
|
touched_list.push(x);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Subsumer::touchBlockedVar(const Var x)
|
||
|
|
{
|
||
|
|
if (!touchedBlockedVarsBool[x]) {
|
||
|
|
touchedBlockedVars.push(VarOcc(x, occur[Lit(x, false).toInt()].size()*occur[Lit(x, true).toInt()].size()));
|
||
|
|
touchedBlockedVarsBool[x] = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Subsumer::touch(const Lit p)
|
||
|
|
{
|
||
|
|
touch(p.var());
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool Subsumer::subsetAbst(uint32_t A, uint32_t B)
|
||
|
|
{
|
||
|
|
return !(A & ~B);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Assumes 'seen' is cleared (will leave it cleared)
|
||
|
|
template<class T1, class T2>
|
||
|
|
bool Subsumer::subset(const T1& A, const T2& B)
|
||
|
|
{
|
||
|
|
for (uint32_t i = 0; i != B.size(); i++)
|
||
|
|
seen_tmp[B[i].toInt()] = 1;
|
||
|
|
for (uint32_t i = 0; i != A.size(); i++) {
|
||
|
|
if (!seen_tmp[A[i].toInt()]) {
|
||
|
|
for (uint32_t i = 0; i != B.size(); i++)
|
||
|
|
seen_tmp[B[i].toInt()] = 0;
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for (uint32_t i = 0; i != B.size(); i++)
|
||
|
|
seen_tmp[B[i].toInt()] = 0;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Subsumer::newVar()
|
||
|
|
{
|
||
|
|
occur .push();
|
||
|
|
occur .push();
|
||
|
|
seen_tmp .push(0); // (one for each polarity)
|
||
|
|
seen_tmp .push(0);
|
||
|
|
touched .push(1);
|
||
|
|
var_elimed .push(0);
|
||
|
|
touchedBlockedVarsBool.push(0);
|
||
|
|
cannot_eliminate.push(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline const vec<char>& Subsumer::getVarElimed() const
|
||
|
|
{
|
||
|
|
return var_elimed;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline const uint32_t Subsumer::getNumElimed() const
|
||
|
|
{
|
||
|
|
return numElimed;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline const double Subsumer::getTotalTime() const
|
||
|
|
{
|
||
|
|
return totalTime;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif //SIMPLIFIER_H
|