141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
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/**************************************************************************************************
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Originally From: Solver.C -- (C) Niklas Een, Niklas Sorensson, 2004
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Substantially modified by: Mate Soos (2010)
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**************************************************************************************************/
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#ifndef XORSIMPLIFIER_H
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#define XORSIMPLIFIER_H
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#include "Solver.h"
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#include "Vec.h"
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#include "XSet.h"
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#include <map>
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#include <vector>
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using std::vector;
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using std::map;
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class ClauseCleaner;
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class XorSubsumer
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{
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public:
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XorSubsumer(Solver& S2);
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const bool simplifyBySubsumption(const bool doFullSubsume = false);
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void unlinkModifiedClause(vec<Lit>& origClause, XorClauseSimp c);
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void unlinkModifiedClauseNoDetachNoNULL(vec<Lit>& origClause, XorClauseSimp c);
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void unlinkClause(XorClauseSimp cc, Var elim = var_Undef);
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XorClauseSimp linkInClause(XorClause& cl);
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void linkInAlreadyClause(XorClauseSimp& c);
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void newVar();
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void extendModel(Solver& solver2);
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const uint32_t getNumElimed() const;
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const vec<char>& getVarElimed() const;
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const bool unEliminate(const Var var);
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const bool checkElimedUnassigned() const;
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const double getTotalTime() const;
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private:
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friend class ClauseCleaner;
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//Main
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vec<XorClauseSimp> clauses;
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vec<vec<XorClauseSimp> > occur; // 'occur[index(lit)]' is a list of constraints containing 'lit'.
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Solver& solver; // The Solver
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// Temporaries (to reduce allocation overhead):
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//
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vec<char> seen_tmp; // (used in various places)
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//Start-up
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void addFromSolver(vec<XorClause*>& cs);
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void addBackToSolver();
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// Subsumption:
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void findSubsumed(XorClause& ps, vec<XorClauseSimp>& out_subsumed);
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bool isSubsumed(XorClause& ps);
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void subsume0(XorClauseSimp& ps);
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template<class T1, class T2>
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bool subset(const T1& A, const T2& B);
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bool subsetAbst(uint32_t A, uint32_t B);
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void findUnMatched(vec<Lit>& A, XorClause& B, vec<Lit>& unmatchedPart);
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//helper
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void testAllClauseAttach() const;
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//dependent removal
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const bool removeDependent();
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void fillCannotEliminate();
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vec<char> cannot_eliminate;
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void addToCannotEliminate(Clause* it);
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void removeWrong(vec<Clause*>& cs);
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//Global stats
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double totalTime;
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map<Var, vector<XorClause*> > elimedOutVar;
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vec<char> var_elimed;
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uint32_t numElimed;
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//Heule-process
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void clearDouble(vec<Lit>& ps) const;
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const bool localSubstitute();
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uint32_t localSubstituteUseful;
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uint32_t clauses_subsumed;
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uint32_t clauses_cut;
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uint32_t origNClauses;
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uint32_t clauseID;
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};
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inline bool XorSubsumer::subsetAbst(uint32_t A, uint32_t B)
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{
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return !(A & ~B);
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}
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// Assumes 'seen' is cleared (will leave it cleared)
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template<class T1, class T2>
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bool XorSubsumer::subset(const T1& A, const T2& B)
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{
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for (uint32_t i = 0; i != B.size(); i++)
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seen_tmp[B[i].var()] = 1;
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for (uint32_t i = 0; i != A.size(); i++) {
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if (!seen_tmp[A[i].var()]) {
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for (uint32_t i = 0; i != B.size(); i++)
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seen_tmp[B[i].var()] = 0;
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return false;
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}
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}
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for (uint32_t i = 0; i != B.size(); i++)
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seen_tmp[B[i].var()] = 0;
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return true;
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}
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inline void XorSubsumer::newVar()
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{
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occur .push();
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seen_tmp .push(0);
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cannot_eliminate.push(0);
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var_elimed.push(0);
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}
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inline const vec<char>& XorSubsumer::getVarElimed() const
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{
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return var_elimed;
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}
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inline const uint32_t XorSubsumer::getNumElimed() const
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{
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return numElimed;
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}
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inline const double XorSubsumer::getTotalTime() const
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{
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return totalTime;
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}
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#endif //XORSIMPLIFIER_H
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