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diff --git a/src/opt/cgt/cgtInt.h b/src/opt/cgt/cgtInt.h
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+/**CFile****************************************************************
+
+  FileName    [cgtInt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Clock gating package.]
+
+  Synopsis    [Internal declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: cgtInt.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef ABC__aig__cgt__cgtInt_h
+#define ABC__aig__cgt__cgtInt_h
+
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include "src/aig/saig/saig.h"
+#include "src/sat/bsat/satSolver.h"
+#include "src/sat/cnf/cnf.h"
+#include "cgt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+
+
+ABC_NAMESPACE_HEADER_START
+
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Cgt_Man_t_ Cgt_Man_t;
+struct Cgt_Man_t_
+{
+    // user's data
+    Cgt_Par_t *  pPars;          // user's parameters
+    Aig_Man_t *  pAig;           // user's AIG manager
+    // user's constraints
+    Aig_Man_t *  pCare;          // constraint cones
+    Vec_Vec_t *  vSuppsInv;      // inverse support of the constraints
+    // result of clock-gating
+    Vec_Vec_t *  vGatesAll;      // the computed clock-gates
+    Vec_Ptr_t *  vGates;         // the selected clock-gates
+    // internal data
+    Aig_Man_t *  pFrame;         // clock gate AIG manager
+    Vec_Ptr_t *  vFanout;        // temporary storage for fanouts
+    Vec_Ptr_t *  vVisited;       // temporary storage for visited nodes
+    // SAT solving
+    Aig_Man_t *  pPart;          // partition
+    Cnf_Dat_t *  pCnf;           // CNF of the partition
+    sat_solver * pSat;           // SAT solver 
+    Vec_Ptr_t *  vPatts;         // simulation patterns
+    int          nPatts;         // the number of patterns accumulated
+    int          nPattWords;     // the number of pattern words
+    // statistics
+    int          nRecycles;      // recycles 
+    int          nCalls;         // total calls
+    int          nCallsSat;      // satisfiable calls
+    int          nCallsUnsat;    // unsatisfiable calls  
+    int          nCallsUndec;    // undecided calls
+    int          nCallsFiltered; // filtered out calls
+    int          timeAig;        // constructing AIG
+    int          timePrepare;    // partitioning and SAT solving
+    int          timeSat;        // total runtime
+    int          timeSatSat;     // satisfiable runtime 
+    int          timeSatUnsat;   // unsatisfiable runtime 
+    int          timeSatUndec;   // undecided runtime
+    int          timeDecision;   // making decision about what gates to use
+    int          timeOther;      // other runtime
+    int          timeTotal;      // total runtime
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== cgtAig.c ==========================================================*/
+extern void             Cgt_ManDetectCandidates( Aig_Man_t * pAig, Aig_Obj_t * pObj, int nLevelMax, Vec_Ptr_t * vCands );
+extern Aig_Man_t *      Cgt_ManDeriveAigForGating( Cgt_Man_t * p );
+extern Aig_Man_t *      Cgt_ManDupPartition( Aig_Man_t * pAig, int nVarsMin, int nFlopsMin, int iStart, Aig_Man_t * pCare, Vec_Vec_t * vSuppsInv, int * pnOutputs );
+extern Aig_Man_t *      Cgt_ManDeriveGatedAig( Aig_Man_t * pAig, Vec_Vec_t * vGates, int fReduce, int * pnUsedNodes );
+/*=== cgtDecide.c ==========================================================*/
+extern Vec_Vec_t *      Cgt_ManDecideSimple( Aig_Man_t * pAig, Vec_Vec_t * vGatesAll, int nOdcMax, int fVerbose );
+extern Vec_Vec_t *      Cgt_ManDecideArea( Aig_Man_t * pAig, Vec_Vec_t * vGatesAll, int nOdcMax, int fVerbose );
+/*=== cgtMan.c ==========================================================*/
+extern Cgt_Man_t *      Cgt_ManCreate( Aig_Man_t * pAig, Aig_Man_t * pCare, Cgt_Par_t * pPars );
+extern void             Cgt_ManClean( Cgt_Man_t * p );
+extern void             Cgt_ManStop( Cgt_Man_t * p );
+/*=== cgtSat.c ==========================================================*/
+extern int              Cgt_CheckImplication( Cgt_Man_t * p, Aig_Obj_t * pGate, Aig_Obj_t * pFlop );
+
+
+
+ABC_NAMESPACE_HEADER_END
+
+
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+