Added libs/minisat (copy of minisat git master)

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diff --git a/libs/minisat/SimpSolver.h b/libs/minisat/SimpSolver.h
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+/************************************************************************************[SimpSolver.h]
+Copyright (c) 2006,      Niklas Een, Niklas Sorensson
+Copyright (c) 2007-2010, Niklas Sorensson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+**************************************************************************************************/
+
+#ifndef Minisat_SimpSolver_h
+#define Minisat_SimpSolver_h
+
+#include "libs/minisat/Queue.h"
+#include "libs/minisat/Solver.h"
+
+
+namespace Minisat {
+
+//=================================================================================================
+
+
+class SimpSolver : public Solver {
+ public:
+    // Constructor/Destructor:
+    //
+    SimpSolver();
+    ~SimpSolver();
+
+    // Problem specification:
+    //
+    Var     newVar    (lbool upol = l_Undef, bool dvar = true);
+    void    releaseVar(Lit l);
+    bool    addClause (const vec<Lit>& ps);
+    bool    addEmptyClause();                // Add the empty clause to the solver.
+    bool    addClause (Lit p);               // Add a unit clause to the solver.
+    bool    addClause (Lit p, Lit q);        // Add a binary clause to the solver.
+    bool    addClause (Lit p, Lit q, Lit r); // Add a ternary clause to the solver.
+    bool    addClause (Lit p, Lit q, Lit r, Lit s); // Add a quaternary clause to the solver. 
+    bool    addClause_(      vec<Lit>& ps);
+    bool    substitute(Var v, Lit x);  // Replace all occurences of v with x (may cause a contradiction).
+
+    // Variable mode:
+    // 
+    void    setFrozen (Var v, bool b); // If a variable is frozen it will not be eliminated.
+    bool    isEliminated(Var v) const;
+
+    // Alternative freeze interface (may replace 'setFrozen()'):
+    void    freezeVar (Var v);         // Freeze one variable so it will not be eliminated.
+    void    thaw      ();              // Thaw all frozen variables.
+
+
+    // Solving:
+    //
+    bool    solve       (const vec<Lit>& assumps, bool do_simp = true, bool turn_off_simp = false);
+    lbool   solveLimited(const vec<Lit>& assumps, bool do_simp = true, bool turn_off_simp = false);
+    bool    solve       (                     bool do_simp = true, bool turn_off_simp = false);
+    bool    solve       (Lit p       ,        bool do_simp = true, bool turn_off_simp = false);       
+    bool    solve       (Lit p, Lit q,        bool do_simp = true, bool turn_off_simp = false);
+    bool    solve       (Lit p, Lit q, Lit r, bool do_simp = true, bool turn_off_simp = false);
+    bool    eliminate   (bool turn_off_elim = false);  // Perform variable elimination based simplification. 
+
+    // Memory managment:
+    //
+    virtual void garbageCollect();
+
+
+    // Generate a (possibly simplified) DIMACS file:
+    //
+#if 0
+    void    toDimacs  (const char* file, const vec<Lit>& assumps);
+    void    toDimacs  (const char* file);
+    void    toDimacs  (const char* file, Lit p);
+    void    toDimacs  (const char* file, Lit p, Lit q);
+    void    toDimacs  (const char* file, Lit p, Lit q, Lit r);
+#endif
+
+    // Mode of operation:
+    //
+    int     grow;              // Allow a variable elimination step to grow by a number of clauses (default to zero).
+    int     clause_lim;        // Variables are not eliminated if it produces a resolvent with a length above this limit.
+                               // -1 means no limit.
+    int     subsumption_lim;   // Do not check if subsumption against a clause larger than this. -1 means no limit.
+    double  simp_garbage_frac; // A different limit for when to issue a GC during simplification (Also see 'garbage_frac').
+
+    bool    use_asymm;         // Shrink clauses by asymmetric branching.
+    bool    use_rcheck;        // Check if a clause is already implied. Prett costly, and subsumes subsumptions :)
+    bool    use_elim;          // Perform variable elimination.
+    bool    extend_model;      // Flag to indicate whether the user needs to look at the full model.
+
+    // Statistics:
+    //
+    int     merges;
+    int     asymm_lits;
+    int     eliminated_vars;
+
+ protected:
+
+    // Helper structures:
+    //
+    struct ElimLt {
+        const LMap<int>& n_occ;
+        explicit ElimLt(const LMap<int>& no) : n_occ(no) {}
+
+        // TODO: are 64-bit operations here noticably bad on 32-bit platforms? Could use a saturating
+        // 32-bit implementation instead then, but this will have to do for now.
+        uint64_t cost  (Var x)        const { return (uint64_t)n_occ[mkLit(x)] * (uint64_t)n_occ[~mkLit(x)]; }
+        bool operator()(Var x, Var y) const { return cost(x) < cost(y); }
+        
+        // TODO: investigate this order alternative more.
+        // bool operator()(Var x, Var y) const { 
+        //     int c_x = cost(x);
+        //     int c_y = cost(y);
+        //     return c_x < c_y || c_x == c_y && x < y; }
+    };
+
+    struct ClauseDeleted {
+        const ClauseAllocator& ca;
+        explicit ClauseDeleted(const ClauseAllocator& _ca) : ca(_ca) {}
+        bool operator()(const CRef& cr) const { return ca[cr].mark() == 1; } };
+
+    // Solver state:
+    //
+    int                 elimorder;
+    bool                use_simplification;
+    Var                 max_simp_var;        // Max variable at the point simplification was turned off.
+    vec<uint32_t>       elimclauses;
+    VMap<char>          touched;
+    OccLists<Var, vec<CRef>, ClauseDeleted>
+                        occurs;
+    LMap<int>           n_occ;
+    Heap<Var,ElimLt>    elim_heap;
+    Queue<CRef>         subsumption_queue;
+    VMap<char>          frozen;
+    vec<Var>            frozen_vars;
+    VMap<char>          eliminated;
+    int                 bwdsub_assigns;
+    int                 n_touched;
+
+    // Temporaries:
+    //
+    CRef                bwdsub_tmpunit;
+
+    // Main internal methods:
+    //
+    lbool         solve_                   (bool do_simp = true, bool turn_off_simp = false);
+    bool          asymm                    (Var v, CRef cr);
+    bool          asymmVar                 (Var v);
+    void          updateElimHeap           (Var v);
+    void          gatherTouchedClauses     ();
+    bool          merge                    (const Clause& _ps, const Clause& _qs, Var v, vec<Lit>& out_clause);
+    bool          merge                    (const Clause& _ps, const Clause& _qs, Var v, int& size);
+    bool          backwardSubsumptionCheck (bool verbose = false);
+    bool          eliminateVar             (Var v);
+    void          extendModel              ();
+
+    void          removeClause             (CRef cr);
+    bool          strengthenClause         (CRef cr, Lit l);
+    bool          implied                  (const vec<Lit>& c);
+    void          relocAll                 (ClauseAllocator& to);
+};
+
+
+//=================================================================================================
+// Implementation of inline methods:
+
+
+inline bool SimpSolver::isEliminated (Var v) const { return eliminated[v]; }
+inline void SimpSolver::updateElimHeap(Var v) {
+    assert(use_simplification);
+    // if (!frozen[v] && !isEliminated(v) && value(v) == l_Undef)
+    if (elim_heap.inHeap(v) || (!frozen[v] && !isEliminated(v) && value(v) == l_Undef))
+        elim_heap.update(v); }
+
+
+inline bool SimpSolver::addClause    (const vec<Lit>& ps)    { ps.copyTo(add_tmp); return addClause_(add_tmp); }
+inline bool SimpSolver::addEmptyClause()                     { add_tmp.clear(); return addClause_(add_tmp); }
+inline bool SimpSolver::addClause    (Lit p)                 { add_tmp.clear(); add_tmp.push(p); return addClause_(add_tmp); }
+inline bool SimpSolver::addClause    (Lit p, Lit q)          { add_tmp.clear(); add_tmp.push(p); add_tmp.push(q); return addClause_(add_tmp); }
+inline bool SimpSolver::addClause    (Lit p, Lit q, Lit r)   { add_tmp.clear(); add_tmp.push(p); add_tmp.push(q); add_tmp.push(r); return addClause_(add_tmp); }
+inline bool SimpSolver::addClause    (Lit p, Lit q, Lit r, Lit s){ add_tmp.clear(); add_tmp.push(p); add_tmp.push(q); add_tmp.push(r); add_tmp.push(s); return addClause_(add_tmp); }
+inline void SimpSolver::setFrozen    (Var v, bool b) { frozen[v] = (char)b; if (use_simplification && !b) { updateElimHeap(v); } }
+
+inline void SimpSolver::freezeVar(Var v){
+    if (!frozen[v]){
+        frozen[v] = 1;
+        frozen_vars.push(v); 
+    } }
+
+inline void SimpSolver::thaw(){
+    for (int i = 0; i < frozen_vars.size(); i++){
+        Var v = frozen_vars[i];
+        frozen[v] = 0;
+        if (use_simplification)
+            updateElimHeap(v);
+    }
+    frozen_vars.clear(); }
+
+inline bool SimpSolver::solve        (                     bool do_simp, bool turn_off_simp)  { budgetOff(); assumptions.clear(); return solve_(do_simp, turn_off_simp) == l_True; }
+inline bool SimpSolver::solve        (Lit p       ,        bool do_simp, bool turn_off_simp)  { budgetOff(); assumptions.clear(); assumptions.push(p); return solve_(do_simp, turn_off_simp) == l_True; }
+inline bool SimpSolver::solve        (Lit p, Lit q,        bool do_simp, bool turn_off_simp)  { budgetOff(); assumptions.clear(); assumptions.push(p); assumptions.push(q); return solve_(do_simp, turn_off_simp) == l_True; }
+inline bool SimpSolver::solve        (Lit p, Lit q, Lit r, bool do_simp, bool turn_off_simp)  { budgetOff(); assumptions.clear(); assumptions.push(p); assumptions.push(q); assumptions.push(r); return solve_(do_simp, turn_off_simp) == l_True; }
+inline bool SimpSolver::solve        (const vec<Lit>& assumps, bool do_simp, bool turn_off_simp){ 
+    budgetOff(); assumps.copyTo(assumptions); return solve_(do_simp, turn_off_simp) == l_True; }
+
+inline lbool SimpSolver::solveLimited (const vec<Lit>& assumps, bool do_simp, bool turn_off_simp){ 
+    assumps.copyTo(assumptions); return solve_(do_simp, turn_off_simp); }
+
+//=================================================================================================
+}
+
+#endif