path: root/src/base/abci/abcRec3.c

/**CFile****************************************************************

  FileName    [abcRec2.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Record of semi-canonical AIG subgraphs.]

  Author      [Allan Yang, Alan Mishchenko]
  
  Affiliation [Fudan University in Shanghai, UC Berkeley]

  Date        [Ver. 1.0. Started - June 20, 2005.]

  Revision    [$Id: abcRec.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "base/abc/abc.h"
#include "map/if/if.h"
#include "bool/kit/kit.h"
#include "aig/gia/giaAig.h"
#include "misc/vec/vecMem.h"
#include "opt/dau/dau.h"
#include "misc/util/utilTruth.h"

ABC_NAMESPACE_IMPL_START

//#define LMS_USE_OLD_FORM

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

/*
    This LMS manager can be used in two modes:
    - library constuction
    - AIG level minimization

    It is not OK to switch from library construction to AIG level minimization
    without restarting LSM manager.  To restart the LSM manager, GIA has to be written out 
    (rec_dump3 <file>.aig) and LMS manager started again (rec_start3 <file>.aig).
*/

typedef struct Lms_Man_t_ Lms_Man_t;
struct Lms_Man_t_
{
    // parameters
    int               nVars;        // the number of variables
    int               nWords;       // the number of TT words
    int               nCuts;        // the max number of cuts to use
    int               fFuncOnly;    // record only functions
    int               fLibConstr;   // this manager is used for library construction
    // internal data for library construction
    Gia_Man_t *       pGia;         // the record
    Vec_Mem_t *       vTtMem;       // truth table memory and hash table
    Vec_Int_t *       vTruthIds;    // truth table IDs of each PO
    // internal data for AIG level minimization (allocated the first time it is called)
    Vec_Int_t *       vTruthPo;     // first PO where this canonicized truth table was seen
    Vec_Wrd_t *       vDelays;      // pin-to-pin delays of each PO
    Vec_Str_t *       vAreas;       // number of AND gates in each PO
    Vec_Int_t *       vFreqs;       // subgraph usage frequencies
    // temporaries
    Vec_Ptr_t *       vNodes;       // the temporary nodes
    Vec_Ptr_t *       vLabelsP;     // temporary storage for HOP node labels
    Vec_Int_t *       vLabels;      // temporary storage for AIG node labels
    word              pTemp1[1024]; // copy of the truth table
    word              pTemp2[1024]; // copy of the truth table
    // statistics 
    int               nTried;
    int               nFilterSize;
    int               nFilterRedund;
    int               nFilterVolume;
    int               nFilterTruth;
    int               nFilterError;
    int               nFilterSame;
    int               nAdded;
    int               nAddedFuncs;
    int               nHoleInTheWall;
    // runtime
    clock_t           timeCollect;
    clock_t           timeCanon;
    clock_t           timeBuild;
    clock_t           timeCheck;
    clock_t           timeInsert;
    clock_t           timeOther;
    clock_t           timeTotal;
};

static Lms_Man_t * s_pMan3 = NULL;

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Lms_Man_t * Lms_ManStart( Gia_Man_t * pGia, int nVars, int nCuts, int fFuncOnly, int fVerbose )
{
    Lms_Man_t * p;
    // if GIA is given, use the number of variables from GIA
    nVars = pGia ? Gia_ManCiNum(pGia) : nVars;
    assert( nVars >= 6 && nVars <= 16 );
    // allocate manager
    p = ABC_CALLOC( Lms_Man_t, 1 );
    // parameters
    p->nVars = nVars;
    p->nCuts = nCuts;
    p->nWords = Abc_Truth6WordNum( nVars );
    p->fFuncOnly = fFuncOnly;
    // internal data for library construction
    p->vTtMem = Vec_MemAlloc( p->nWords, 12 ); // 32 KB/page for 6-var functions
    Vec_MemHashAlloc( p->vTtMem, 10000 );
    p->vTruthIds = Vec_IntAlloc( 10000 );
    if ( pGia == NULL )
    {
        int i;
        p->pGia = Gia_ManStart( 10000 );
        p->pGia->pName = Abc_UtilStrsav( "record" );
        for ( i = 0; i < nVars; i++ )
            Gia_ManAppendCi( p->pGia );
    }
    else
    {
        Gia_Obj_t * pObj;
        unsigned * pTruth;
        int i, Index, Prev = -1;
        p->pGia = pGia;
        // populate the manager with subgraphs present in GIA
        p->nAdded = Gia_ManCoNum( p->pGia );
        Gia_ManForEachCo( p->pGia, pObj, i )
        {
            pTruth = Gia_ObjComputeTruthTable( p->pGia, pObj );
            Index = Vec_MemHashInsert( p->vTtMem, (word *)pTruth );
            assert( Index == Prev || Index == Prev + 1 ); // GIA subgraphs should be ordered
            Vec_IntPush( p->vTruthIds, Index );
            Prev = Index;
        }
    }
    // temporaries
    p->vNodes    = Vec_PtrAlloc( 1000 );
    p->vLabelsP  = Vec_PtrAlloc( 1000 );
    p->vLabels   = Vec_IntAlloc( 1000 );
    return p;    
}
void Lms_ManStop( Lms_Man_t * p )
{
    // temporaries
    Vec_IntFreeP( &p->vLabels );
    Vec_PtrFreeP( &p->vLabelsP );
    Vec_PtrFreeP( &p->vNodes );
    // internal data for AIG level minimization
    Vec_IntFreeP( &p->vTruthPo );
    Vec_WrdFreeP( &p->vDelays );
    Vec_StrFreeP( &p->vAreas );
    Vec_IntFreeP( &p->vFreqs );
    // internal data for library construction
    Vec_IntFreeP( &p->vTruthIds );
    Vec_MemHashFree( p->vTtMem );
    Vec_MemFree( p->vTtMem );
    Gia_ManStop( p->pGia );
    ABC_FREE( p );
}
void Lms_ManPrint( Lms_Man_t * p )
{
//    Gia_ManPrintStats( p->pGia, 0, 0 );
    printf( "Library with %d vars has %d classes and %d AIG subgraphs with %d AND nodes.\n", 
        Gia_ManCiNum(p->pGia), Vec_MemEntryNum(p->vTtMem), p->nAdded, Gia_ManAndNum(p->pGia) );

    p->nAddedFuncs = Vec_MemEntryNum(p->vTtMem);
    printf( "Subgraphs tried                             = %10d. (%6.2f %%)\n", p->nTried,         !p->nTried? 0 : 100.0*p->nTried/p->nTried );
    printf( "Subgraphs filtered by support size          = %10d. (%6.2f %%)\n", p->nFilterSize,    !p->nTried? 0 : 100.0*p->nFilterSize/p->nTried );
    printf( "Subgraphs filtered by structural redundancy = %10d. (%6.2f %%)\n", p->nFilterRedund,  !p->nTried? 0 : 100.0*p->nFilterRedund/p->nTried );
    printf( "Subgraphs filtered by volume                = %10d. (%6.2f %%)\n", p->nFilterVolume,  !p->nTried? 0 : 100.0*p->nFilterVolume/p->nTried );
    printf( "Subgraphs filtered by TT redundancy         = %10d. (%6.2f %%)\n", p->nFilterTruth,   !p->nTried? 0 : 100.0*p->nFilterTruth/p->nTried );
    printf( "Subgraphs filtered by error                 = %10d. (%6.2f %%)\n", p->nFilterError,   !p->nTried? 0 : 100.0*p->nFilterError/p->nTried );
    printf( "Subgraphs filtered by isomorphism           = %10d. (%6.2f %%)\n", p->nFilterSame,    !p->nTried? 0 : 100.0*p->nFilterSame/p->nTried );
    printf( "Subgraphs added                             = %10d. (%6.2f %%)\n", p->nAdded,         !p->nTried? 0 : 100.0*p->nAdded/p->nTried );
    printf( "Functions added                             = %10d. (%6.2f %%)\n", p->nAddedFuncs,    !p->nTried? 0 : 100.0*p->nAddedFuncs/p->nTried );
    if ( p->nHoleInTheWall )
    printf( "Cuts whose logic structure has a hole       = %10d. (%6.2f %%)\n", p->nHoleInTheWall, !p->nTried? 0 : 100.0*p->nHoleInTheWall/p->nTried );

    p->timeOther = p->timeTotal - p->timeCollect - p->timeCanon - p->timeBuild - p->timeCheck - p->timeInsert;
    ABC_PRTP( "Runtime: Collect", p->timeCollect, p->timeTotal );
    ABC_PRTP( "Runtime: Canon  ", p->timeCanon,   p->timeTotal );
    ABC_PRTP( "Runtime: Build  ", p->timeBuild,   p->timeTotal );
    ABC_PRTP( "Runtime: Check  ", p->timeCheck,   p->timeTotal );
    ABC_PRTP( "Runtime: Insert ", p->timeInsert,  p->timeTotal );
    ABC_PRTP( "Runtime: Other  ", p->timeOther,   p->timeTotal );
    ABC_PRTP( "Runtime: TOTAL  ", p->timeTotal,   p->timeTotal );
}


/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkRecStart3( Gia_Man_t * p, int nVars, int nCuts, int fFuncOnly, int fVerbose )
{
    assert( s_pMan3 == NULL );
    s_pMan3 = Lms_ManStart( p, nVars, nCuts, fFuncOnly, fVerbose );
}

void Abc_NtkRecStop3()
{
    assert( s_pMan3 != NULL );
    Lms_ManStop( s_pMan3 );
    s_pMan3 = NULL;
}


/**Function*************************************************************

  Synopsis    [Compute delay/area profiles of POs.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int  Lms_DelayGet( word D, int v )           { assert(v >= 0 && v < 16); return (int)((D >> (v << 2)) & 0xF);                    }
static inline void Lms_DelaySet( word * pD, int v, int d ) { assert(v >= 0 && v < 16); assert(d >= 0 && d < 16); *pD |= ((word)d << (v << 2)); }
static inline word Lms_DelayInit( int v )                  { assert(v >= 0 && v < 16); return (word)1 << (v << 2);                             }
static inline word Lms_DelayMax( word D1, word D2, int nVars )
{
    int v, Max;
    word D = 0;
    for ( v = 0; v < nVars; v++ )
        if ( (Max = Abc_MaxInt(Lms_DelayGet(D1, v), Lms_DelayGet(D2, v))) )
            Lms_DelaySet( &D, v, Abc_MinInt(Max + 1, 15) );
    return D;
}
static inline word Lms_DelayDecrement( word D1, int nVars )
{
    int v;
    word D = 0;
    for ( v = 0; v < nVars; v++ )
        if ( Lms_DelayGet(D1, v) )
            Lms_DelaySet( &D, v, Lms_DelayGet(D1, v) - 1 );
    return D;
}
static inline int Lms_DelayEqual( word D1, word D2, int nVars ) // returns 1 if D1 has the same delays than D2
{
    int v;
    for ( v = 0; v < nVars; v++ )
        if ( Lms_DelayGet(D1, v) != Lms_DelayGet(D2, v) )
            return 0;
    return 1;
}
static inline int Lms_DelayDom( word D1, word D2, int nVars ) // returns 1 if D1 has the same or smaller delays than D2
{
    int v;
    for ( v = 0; v < nVars; v++ )
        if ( Lms_DelayGet(D1, v) > Lms_DelayGet(D2, v) )
            return 0;
    return 1;
}
static inline void Lms_DelayPrint( word D, int nVars )
{
    int v;
    printf( "Delay profile = {" );
    for ( v = 0; v < nVars; v++ )
        printf( " %d", Lms_DelayGet(D, v) );
    printf( " }\n" );
}
Vec_Wrd_t * Lms_GiaDelays( Gia_Man_t * p )
{
    Vec_Wrd_t * vDelays, * vResult;
    Gia_Obj_t * pObj;
    int i;
    // compute delay profiles of all objects
    vDelays = Vec_WrdAlloc( Gia_ManObjNum(p) );
    Vec_WrdPush( vDelays, 0 ); // const 0
    Gia_ManForEachObj1( p, pObj, i )
    {
        if ( Gia_ObjIsAnd(pObj) )
            Vec_WrdPush( vDelays, Lms_DelayMax( Vec_WrdEntry(vDelays, Gia_ObjFaninId0(pObj, i)), Vec_WrdEntry(vDelays, Gia_ObjFaninId1(pObj, i)), Gia_ManCiNum(p) ) );
        else if ( Gia_ObjIsCo(pObj) )
            Vec_WrdPush( vDelays, Lms_DelayDecrement( Vec_WrdEntry(vDelays, Gia_ObjFaninId0(pObj, i)), Gia_ManCiNum(p) ) );
        else if ( Gia_ObjIsCi(pObj) )
            Vec_WrdPush( vDelays, Lms_DelayInit( Gia_ObjCioId(pObj) ) );
        else assert( 0 );
    }
    // collect delay profiles of COs only
    vResult = Vec_WrdAlloc( Gia_ManCoNum(p) );
    Gia_ManForEachCo( p, pObj, i )
        Vec_WrdPush( vResult, Vec_WrdEntry(vDelays, Gia_ObjId(p, pObj)) );
    Vec_WrdFree( vDelays );
    return vResult;
}
void Lms_ObjAreaMark_rec( Gia_Obj_t * pObj )
{
    if ( pObj->fMark0 || Gia_ObjIsCi(pObj) )
        return;
    pObj->fMark0 = 1;
    Lms_ObjAreaMark_rec( Gia_ObjFanin0(pObj) );
    Lms_ObjAreaMark_rec( Gia_ObjFanin1(pObj) );
}
int  Lms_ObjAreaUnmark_rec( Gia_Obj_t * pObj )
{
    if ( !pObj->fMark0 || Gia_ObjIsCi(pObj) )
        return 0;
    pObj->fMark0 = 0;
    return 1 + Lms_ObjAreaUnmark_rec( Gia_ObjFanin0(pObj) ) 
             + Lms_ObjAreaUnmark_rec( Gia_ObjFanin1(pObj) );
}
int Lms_ObjArea( Gia_Obj_t * pObj )
{
    assert( Gia_ObjIsAnd(pObj) );
    Lms_ObjAreaMark_rec( pObj );
    return Lms_ObjAreaUnmark_rec( pObj );    
}
Vec_Str_t * Lms_GiaAreas( Gia_Man_t * p )
{
    Vec_Str_t * vAreas;
    Gia_Obj_t * pObj;
    int i;
    vAreas = Vec_StrAlloc( Gia_ManCoNum(p) );
    Gia_ManForEachCo( p, pObj, i )
        Vec_StrPush( vAreas, (char)(Gia_ObjIsAnd(Gia_ObjFanin0(pObj)) ? Lms_ObjArea(Gia_ObjFanin0(pObj)) : 0) );
    return vAreas;
}

/**Function*************************************************************

  Synopsis    [Prints one GIA subgraph.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Lms_GiaPrintSubgraph_rec( Gia_Man_t * p, Gia_Obj_t * pObj )
{
    if ( !pObj->fMark0 || Gia_ObjIsCi(pObj) )
        return;
    pObj->fMark0 = 0;
    assert( Gia_ObjIsAnd(pObj) );
    Lms_GiaPrintSubgraph_rec( p, Gia_ObjFanin0(pObj) );
    Lms_GiaPrintSubgraph_rec( p, Gia_ObjFanin1(pObj) );
    Gia_ObjPrint( p, pObj );
}
void Lms_GiaPrintSubgraph( Gia_Man_t * p, Gia_Obj_t * pObj )
{
    assert( Gia_ObjIsCo(pObj) );
    if ( Gia_ObjIsAnd(Gia_ObjFanin0(pObj)) )
    {
        Lms_ObjAreaMark_rec( Gia_ObjFanin0(pObj) );
        Lms_GiaPrintSubgraph_rec( p, Gia_ObjFanin0(pObj) ); 
    }
    else
        Gia_ObjPrint( p, Gia_ObjFanin0(pObj) );
    Gia_ObjPrint( p, pObj );
}

/**Function*************************************************************

  Synopsis    [Prints delay/area profiles of the GIA subgraphs.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Lms_GiaProfilesPrint( Gia_Man_t * p )
{
    Gia_Obj_t * pObj;
    int i;
    Vec_Wrd_t * vDelays;
    Vec_Str_t * vAreas;
    vDelays = Lms_GiaDelays( p );
    vAreas = Lms_GiaAreas( p );

    Gia_ManForEachPo( p, pObj, i )
    {
        printf( "%6d : ", i );
        printf( "A = %2d  ", Vec_StrEntry(vAreas, i) );
        Lms_DelayPrint( Vec_WrdEntry(vDelays, i), Gia_ManPiNum(p) );
//        Lms_GiaPrintSubgraph( p, pObj );
//        printf( "\n" );
    }

    Vec_WrdFree( vDelays );
    Vec_StrFree( vAreas );
}

/**Function*************************************************************

  Synopsis    [Compute support sizes for each CO.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Vec_Str_t * Gia_ManSuppSizes( Gia_Man_t * p )
{
    Vec_Str_t * vResult;
    Vec_Str_t * vSupps;
    Gia_Obj_t * pObj;
    int i;
    vSupps = Vec_StrAlloc( Gia_ManObjNum(p) );
    Vec_StrPush( vSupps, 0 );
    Gia_ManForEachObj1( p, pObj, i )
    {
        if ( Gia_ObjIsAnd(pObj) )
            Vec_StrPush( vSupps, (char)Abc_MaxInt( Vec_StrEntry(vSupps, Gia_ObjFaninId0(pObj, i)), Vec_StrEntry(vSupps, Gia_ObjFaninId1(pObj, i)) ) );
        else if ( Gia_ObjIsCo(pObj) )
            Vec_StrPush( vSupps, Vec_StrEntry(vSupps, Gia_ObjFaninId0(pObj, i)) );
        else if ( Gia_ObjIsCi(pObj) )
            Vec_StrPush( vSupps, (char)(Gia_ObjCioId(pObj)+1) );
        else assert( 0 );
    }
    assert( Vec_StrSize(vSupps) == Gia_ManObjNum(p) );
    vResult = Vec_StrAlloc( Gia_ManCoNum(p) );
    Gia_ManForEachCo( p, pObj, i )
        Vec_StrPush( vResult, Vec_StrEntry(vSupps, Gia_ObjId(p, pObj)) );
    Vec_StrFree( vSupps );
    return vResult;
}


/**Function*************************************************************

  Synopsis    [Recanonicizes the library and add it to the current library.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkRecLibMerge3( Gia_Man_t * pLib )
{
    int fCheck = 0;
    Lms_Man_t * p = s_pMan3;
    Gia_Man_t * pGia = p->pGia;
    Vec_Str_t * vSupps;
    char pCanonPerm[16];
    unsigned uCanonPhase;
    unsigned * pTruth;
    int i, k, Index, iFanin0, iFanin1, nLeaves;
    Gia_Obj_t * pObjPo, * pDriver, * pTemp = NULL;
    clock_t clk, clk2 = clock();

    assert( Gia_ManCiNum(pLib) == Gia_ManCiNum(pGia) );

    // create hash table if not available
    if ( pGia->pHTable == NULL )
        Gia_ManHashStart( pGia );

    // add AIG subgraphs
    vSupps = Gia_ManSuppSizes( pLib );
    Gia_ManForEachCo( pLib, pObjPo, k )
    {
        // get support size
        nLeaves = Vec_StrEntry(vSupps, k);
        assert( nLeaves > 1 );
        // compute the truth table
clk = clock();
        pTruth = Gia_ObjComputeTruthTable( pLib, Gia_ObjFanin0(pObjPo) );
p->timeCollect += clock() - clk;
        // semi-canonicize
clk = clock();
        memcpy( p->pTemp1, pTruth, p->nWords * sizeof(word) );
#ifdef LMS_USE_OLD_FORM
        uCanonPhase = Kit_TruthSemiCanonicize( (unsigned *)p->pTemp1, (unsigned *)p->pTemp2, nLeaves, pCanonPerm );
#else
        uCanonPhase = Abc_TtCanonicize( p->pTemp1, nLeaves, pCanonPerm );
#endif
        Abc_TtStretch5( (unsigned *)p->pTemp1, nLeaves, p->nVars );
p->timeCanon += clock() - clk;
        // pCanonPerm and uCanonPhase show what was the variable corresponding to each var in the current truth

clk = clock();
        // map cut leaves into elementary variables of GIA
        for ( i = 0; i < nLeaves; i++ )
            Gia_ManCi( pLib, pCanonPerm[i] )->Value = Abc_Var2Lit( Gia_ObjId(pGia, Gia_ManPi(pGia, i)), (uCanonPhase >> i) & 1 );
        // build internal nodes
        assert( Vec_IntSize(pLib->vTtNodes) > 0 );
        Gia_ManForEachObjVec( pLib->vTtNodes, pLib, pTemp, i )
        {
            iFanin0 = Abc_LitNotCond( Gia_ObjFanin0(pTemp)->Value, Gia_ObjFaninC0(pTemp) );
            iFanin1 = Abc_LitNotCond( Gia_ObjFanin1(pTemp)->Value, Gia_ObjFaninC1(pTemp) );
            pTemp->Value = Gia_ManHashAnd( pGia, iFanin0, iFanin1 );
        }
p->timeBuild += clock() - clk;

        // check if this node is already driving a PO
        assert( Gia_ObjIsAnd(pTemp) );
        pDriver = Gia_ManObj(pGia, Abc_Lit2Var(pTemp->Value));
        if ( pDriver->fMark1 )
        {
            p->nFilterSame++;
            continue;
        }
        pDriver->fMark1 = 1;
        // create output
        Gia_ManAppendCo( pGia, Abc_LitNotCond( pTemp->Value, (uCanonPhase >> nLeaves) & 1 ) );

        // verify truth table
        if ( fCheck )
        {
clk = clock();
        pTemp = Gia_ManCo(pGia, Gia_ManCoNum(pGia)-1);
        pTruth = Gia_ObjComputeTruthTable( pGia, Gia_ManCo(pGia, Gia_ManCoNum(pGia)-1) );
p->timeCheck += clock() - clk;
        if ( memcmp( p->pTemp1, pTruth, p->nWords * sizeof(word) ) != 0 )
        {
    
            Kit_DsdPrintFromTruth( pTruth, nLeaves ); printf( "\n" );
            Kit_DsdPrintFromTruth( (unsigned *)p->pTemp1, nLeaves ); printf( "\n" );
            printf( "Truth table verification has failed.\n" );
    
            // drive PO with constant
            Gia_ManPatchCoDriver( pGia, Gia_ManCoNum(pGia)-1, 0 );
            // save truth table ID
            Vec_IntPush( p->vTruthIds, -1 );
            p->nFilterTruth++;
            continue;
        }
        }

clk = clock();
        // add the resulting truth table to the hash table 
        Index = Vec_MemHashInsert( p->vTtMem, p->pTemp1 );
        // save truth table ID
        Vec_IntPush( p->vTruthIds, Index );
        assert( Gia_ManCoNum(pGia) == Vec_IntSize(p->vTruthIds) );
        p->nAdded++;
p->timeInsert += clock() - clk;
    }
    Vec_StrFree( vSupps );
p->timeTotal += clock() - clk2;
}


/**Function*************************************************************

  Synopsis    [Evaluates one cut during library construction.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkRecAddCut3( If_Man_t * pIfMan, If_Obj_t * pRoot, If_Cut_t * pCut )
{
    Lms_Man_t * p = s_pMan3;
    char pCanonPerm[16];
    unsigned uCanonPhase;
    int i, Index, iFanin0, iFanin1, fHole;
    int nLeaves = If_CutLeaveNum(pCut);
    Vec_Ptr_t * vNodes = p->vNodes;
    Gia_Man_t * pGia = p->pGia;
    Gia_Obj_t * pDriver;
    If_Obj_t * pIfObj = NULL;
    unsigned * pTruth;
    clock_t clk;
    p->nTried++;

    // skip small cuts
    assert( p->nVars == (int)pCut->nLimit );
    if ( nLeaves < 2 )
    {
        p->nFilterSize++;
        return 1;
    }

    // collect internal nodes and skip redundant cuts
clk = clock();
    If_CutTraverse( pIfMan, pRoot, pCut, vNodes );
p->timeCollect += clock() - clk;

    // semi-canonicize truth table
clk = clock();
    memcpy( p->pTemp1, If_CutTruthW(pCut), p->nWords * sizeof(word) );
#ifdef LMS_USE_OLD_FORM
    uCanonPhase = Kit_TruthSemiCanonicize( (unsigned *)p->pTemp1, (unsigned *)p->pTemp2, nLeaves, pCanonPerm );
#else
    uCanonPhase = Abc_TtCanonicize( p->pTemp1, nLeaves, pCanonPerm );
#endif
    Abc_TtStretch5( (unsigned *)p->pTemp1, nLeaves, p->nVars );
p->timeCanon += clock() - clk;
    // pCanonPerm and uCanonPhase show what was the variable corresponding to each var in the current truth

clk = clock();
    // map cut leaves into elementary variables of GIA
    for ( i = 0; i < nLeaves; i++ )
        If_ManObj( pIfMan, pCut->pLeaves[(int)pCanonPerm[i]] )->iCopy = Abc_Var2Lit( Gia_ObjId(pGia, Gia_ManPi(pGia, i)), (uCanonPhase >> i) & 1 );
    // build internal nodes
    fHole = 0;
    assert( Vec_PtrSize(vNodes) > 0 );
    Vec_PtrForEachEntryStart( If_Obj_t *, vNodes, pIfObj, i, nLeaves )
    {
        if ( If_ObjIsCi(pIfObj) )
        {
            pIfObj->iCopy = 0;
            fHole = 1;
            continue;
        }
        iFanin0 = Abc_LitNotCond( If_ObjFanin0(pIfObj)->iCopy, If_ObjFaninC0(pIfObj) );
        iFanin1 = Abc_LitNotCond( If_ObjFanin1(pIfObj)->iCopy, If_ObjFaninC1(pIfObj) );
        pIfObj->iCopy = Gia_ManHashAnd( pGia, iFanin0, iFanin1 );
    }
    p->nHoleInTheWall += fHole;
p->timeBuild += clock() - clk;

    // check if this node is already driving a PO
    assert( If_ObjIsAnd(pIfObj) );
    pDriver = Gia_ManObj(pGia, Abc_Lit2Var(pIfObj->iCopy));
    if ( pDriver->fMark1 )
    {
        p->nFilterSame++;
        return 1;
    }
    pDriver->fMark1 = 1;
    // create output
    Gia_ManAppendCo( pGia, Abc_LitNotCond( pIfObj->iCopy, (uCanonPhase >> nLeaves) & 1 ) );

    // verify truth table
clk = clock();
    pTruth = Gia_ObjComputeTruthTable( pGia, Gia_ManCo(pGia, Gia_ManCoNum(pGia)-1) );
p->timeCheck += clock() - clk;
    if ( memcmp( p->pTemp1, pTruth, p->nWords * sizeof(word) ) != 0 )
    {
/*
        Kit_DsdPrintFromTruth( pTruth, nLeaves ); printf( "\n" );
        Kit_DsdPrintFromTruth( (unsigned *)p->pTemp1, nLeaves ); printf( "\n" );
        printf( "Truth table verification has failed.\n" );
*/
        // drive PO with constant
        Gia_ManPatchCoDriver( pGia, Gia_ManCoNum(pGia)-1, 0 );
        // save truth table ID
        Vec_IntPush( p->vTruthIds, -1 );
        p->nFilterTruth++;
        return 1;
    }

clk = clock();
    // add the resulting truth table to the hash table 
    Index = Vec_MemHashInsert( p->vTtMem, p->pTemp1 );
    // save truth table ID
    Vec_IntPush( p->vTruthIds, Index );
    assert( Gia_ManCoNum(pGia) == Vec_IntSize(p->vTruthIds) );
    p->nAdded++;
p->timeInsert += clock() - clk;
    return 1;
}

/**Function*************************************************************

  Synopsis    [Top level procedure for library construction.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkRecAdd3( Abc_Ntk_t * pNtk, int fUseSOPB )
{
    extern Abc_Ntk_t * Abc_NtkIf( Abc_Ntk_t * pNtk, If_Par_t * pPars );
    If_Par_t Pars, * pPars = &Pars;
    Abc_Ntk_t * pNtkNew;
    int clk = clock();
    if ( Abc_NtkGetChoiceNum( pNtk ) )
        printf( "Performing recoding structures with choices.\n" );
    // remember that the manager was used for library construction
    s_pMan3->fLibConstr = 1;
    // create hash table if not available
    if ( s_pMan3->pGia->pHTable == NULL )
        Gia_ManHashStart( s_pMan3->pGia );

    // set defaults
    memset( pPars, 0, sizeof(If_Par_t) );
    // user-controlable paramters
    pPars->nLutSize    =  s_pMan3->nVars;
    pPars->nCutsMax    =  s_pMan3->nCuts;
    pPars->DelayTarget = -1;
    pPars->Epsilon     =  (float)0.005;
    pPars->fArea       =  1;
    // internal parameters
    if ( fUseSOPB )
    {
        pPars->fTruth      =  1;
        pPars->fCutMin     =  0;
        pPars->fUsePerm    =  1; 
        pPars->fDelayOpt   =  1;
    }
    else
    {
        pPars->fTruth      =  1;
        pPars->fCutMin     =  1;
        pPars->fUsePerm    =  0; 
        pPars->fDelayOpt   =  0;
    }
    pPars->fSkipCutFilter = 0;
    pPars->pFuncCost   =  NULL;
    pPars->pFuncUser   =  Abc_NtkRecAddCut3;
    // perform recording
    pNtkNew = Abc_NtkIf( pNtk, pPars );
    Abc_NtkDelete( pNtkNew );
s_pMan3->timeTotal += clock() - clk;
}

 /**Function*************************************************************

  Synopsis    [Returns min AIG level at the output fo the cut using the library.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int If_CutComputeDelay( If_Man_t * p, If_Cut_t * pCut, char * pCanonPerm, word Delay )
{
    If_Obj_t* pLeaf;
    int nLeaves = If_CutLeaveNum(pCut);
    int i, delayTemp, delayMax = -ABC_INFINITY;
    for ( i = 0; i < nLeaves; i++ )
    {
        pLeaf = If_ManObj(p, (pCut)->pLeaves[(int)pCanonPerm[i]]);
        delayTemp = If_ObjCutBest(pLeaf)->Delay + Lms_DelayGet(Delay, i);
        if(delayTemp > delayMax)
            delayMax = delayTemp;
    }
    return delayMax;
}
static inline int If_CutFindBestStruct( If_Man_t * pIfMan, If_Cut_t * pCut, char * pCanonPerm, unsigned * puCanonPhase, int * pBestPo )
{
    Lms_Man_t * p = s_pMan3;
    int i, * pTruthId, iFirstPo, iFirstPoNext, iBestPo;
    int BestDelay = ABC_INFINITY, BestArea = ABC_INFINITY, Delay, Area;
    int nLeaves = If_CutLeaveNum( pCut );
    clock_t clk;

    // semicanonicize the function
clk = clock();
    memcpy( p->pTemp1, If_CutTruthW(pCut), p->nWords * sizeof(word) );
#ifdef LMS_USE_OLD_FORM
    *puCanonPhase = Kit_TruthSemiCanonicize( (unsigned *)p->pTemp1, (unsigned *)p->pTemp2, nLeaves, pCanonPerm );
#else
    *puCanonPhase = Abc_TtCanonicize( p->pTemp1, nLeaves, pCanonPerm );
#endif
    Abc_TtStretch5( (unsigned *)p->pTemp1, nLeaves, p->nVars );
p->timeCanon += clock() - clk;

    // get TT ID for the given class
    pTruthId = Vec_MemHashLookup( p->vTtMem, p->pTemp1 );
    if ( *pTruthId == -1 )
        return ABC_INFINITY;

    // note that array p->vTruthPo contains the first PO for the given truth table
    // other POs belonging to the same equivalence class follow immediately after this one
    // to iterate through the POs, we need to perform the following steps

    // find the first PO of this class
    iFirstPo = Vec_IntEntry( p->vTruthPo, *pTruthId );
    // find the first PO of the next class
    iFirstPoNext = Vec_IntEntry( p->vTruthPo, *pTruthId+1 );
    // iterate through the subgraphs of this class
    iBestPo = -1;
    for ( i = iFirstPo; i < iFirstPoNext; i++ )
    {
        Delay = If_CutComputeDelay( pIfMan, pCut, pCanonPerm, Vec_WrdEntry(p->vDelays, i) );
        Area  = Vec_StrEntry(p->vAreas, i);
        if ( iBestPo == -1 || BestDelay > Delay || (BestDelay == Delay && BestArea > Area) )
        {
            iBestPo = i;
            BestDelay = Delay;
            BestArea = Area;
        }
    }
    if ( pBestPo )
        *pBestPo = iBestPo;
    return BestDelay; 
}
int If_CutDelayRecCost3( If_Man_t * pIfMan, If_Cut_t * pCut, If_Obj_t * pObj )
{
    Lms_Man_t * p = s_pMan3;
    char pCanonPerm[16];
    unsigned uCanonPhase;
    // make sure the cut functions match the library
    assert( p->nVars == (int)pCut->nLimit );
    // if this assertion fires, it means that LMS manager was used for library construction
    // in this case, GIA has to be written out and the manager restarted as described above
    assert( !p->fLibConstr );
    if ( p->vTruthPo == NULL ) // the first time AIG level minimization is called
    {
        // compute the first PO for each semi-canonical form
        int i, Entry;
        p->vTruthPo = Vec_IntStartFull( Vec_MemEntryNum(p->vTtMem)+1 );
        assert( Vec_IntFindMin(p->vTruthIds) >= 0 );
        assert( Vec_IntFindMax(p->vTruthIds) < Vec_MemEntryNum(p->vTtMem) );
        Vec_IntForEachEntry( p->vTruthIds, Entry, i )
            if ( Vec_IntEntry(p->vTruthPo, Entry) == -1 )
                Vec_IntWriteEntry( p->vTruthPo, Entry, i );
        Vec_IntWriteEntry( p->vTruthPo, Vec_MemEntryNum(p->vTtMem), Gia_ManCoNum(p->pGia) );
        // compute delay/area and init frequency
        assert( p->vDelays == NULL );
        assert( p->vAreas == NULL );
        assert( p->vFreqs == NULL );
        p->vDelays = Lms_GiaDelays( p->pGia );
        p->vAreas  = Lms_GiaAreas( p->pGia );
        p->vFreqs  = Vec_IntStart( Gia_ManCoNum(p->pGia) );
    }
    // return the delay of the best structure
    return If_CutFindBestStruct( pIfMan, pCut, pCanonPerm, &uCanonPhase, NULL );
}

/**Function*************************************************************

  Synopsis    [Reexpresses the best structure of the cut in the HOP manager.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Hop_Obj_t * Abc_RecToHop3( Hop_Man_t * pMan, If_Man_t * pIfMan, If_Cut_t * pCut, If_Obj_t * pIfObj )
{
    Lms_Man_t * p = s_pMan3;
    char pCanonPerm[16];
    unsigned uCanonPhase;
    Hop_Obj_t * pFan0, * pFan1, * pHopObj;
    Gia_Man_t * pGia = p->pGia;
    Gia_Obj_t * pGiaPo, * pGiaTemp = NULL;
    int i, BestPo = -1, nLeaves = If_CutLeaveNum(pCut);
    assert( pIfMan->pPars->fCutMin == 1 );
    assert( nLeaves > 1 );

    // get the best output for this node
    If_CutFindBestStruct( pIfMan, pCut, pCanonPerm, &uCanonPhase, &BestPo );
    assert( BestPo >= 0 );
    pGiaPo = Gia_ManCo( pGia, BestPo );

    // collect internal nodes into pGia->vTtNodes
    if ( pGia->vTtNodes == NULL )
        pGia->vTtNodes = Vec_IntAlloc( 256 );
    Gia_ObjCollectInternal( pGia, pGiaPo );
    // collect HOP nodes for leaves
    Vec_PtrClear( p->vLabelsP );
    for ( i = 0; i < nLeaves; i++ )
    {
        pHopObj = Hop_IthVar( pMan, pCanonPerm[i] );
        pHopObj = Hop_NotCond( pHopObj, (uCanonPhase >> i) & 1 );
        Vec_PtrPush(p->vLabelsP, pHopObj);
    }
    // compute HOP nodes for internal nodes
    Gia_ManForEachObjVec( pGia->vTtNodes, pGia, pGiaTemp, i )
    {
        pGiaTemp->fMark0 = 0; // unmark node marked by Gia_ObjCollectInternal()

        if ( Gia_ObjIsAnd(Gia_ObjFanin0(pGiaTemp)) )
            pFan0 = (Hop_Obj_t *)Vec_PtrEntry(p->vLabelsP, Gia_ObjNum(pGia, Gia_ObjFanin0(pGiaTemp)) + nLeaves);
        else
            pFan0 = (Hop_Obj_t *)Vec_PtrEntry(p->vLabelsP, Gia_ObjCioId(Gia_ObjFanin0(pGiaTemp)));
        pFan0 = Hop_NotCond(pFan0, Gia_ObjFaninC0(pGiaTemp));

        if ( Gia_ObjIsAnd(Gia_ObjFanin1(pGiaTemp)) )
            pFan1 = (Hop_Obj_t *)Vec_PtrEntry(p->vLabelsP, Gia_ObjNum(pGia, Gia_ObjFanin1(pGiaTemp)) + nLeaves);
        else
            pFan1 = (Hop_Obj_t *)Vec_PtrEntry(p->vLabelsP, Gia_ObjCioId(Gia_ObjFanin1(pGiaTemp)));
        pFan1 = Hop_NotCond(pFan1, Gia_ObjFaninC1(pGiaTemp));

        pHopObj = Hop_And(pMan, pFan0, pFan1);
        Vec_PtrPush(p->vLabelsP, pHopObj);
    }
    // get the final result
    assert( Gia_ObjIsAnd(pGiaTemp) );
    pHopObj = (Hop_Obj_t *)Vec_PtrEntry(p->vLabelsP, Gia_ObjNum(pGia, pGiaTemp) + nLeaves);
    // complement the result if needed
    return Hop_NotCond( pHopObj,  pCut->fCompl ^ Gia_ObjFaninC0(pGiaPo) ^ ((uCanonPhase >> nLeaves) & 1) );    
}


/**Function*************************************************************

  Synopsis    [Reduces GIA to contain only useful COs and internal nodes.]

  Description [During library construction, redundant nodes are added.
  Some COs are found to be useless because their TT does not match the
  (semi-canonicized TT) of the cut, etc.  This procedure reduces GIA
  to contains only useful (non-redundant, non-dominated) COs and the
  corresponding internal nodes. This procedure replaces GIA by a new GIA
  and creates new vTruthIds. The COs with the same truth table have
  adjacent IDs. This procedure does not change the truth tables.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
// count how many times TT occurs
Vec_Int_t * Lms_GiaCountTruths( Lms_Man_t * p )
{
    Vec_Int_t * vCounts = Vec_IntStart( Vec_MemEntryNum(p->vTtMem) );
    int i, Entry;
    Vec_IntForEachEntry( p->vTruthIds, Entry, i )
        if ( Entry >= 0 )
            Vec_IntAddToEntry( vCounts, Entry, 1 );
    return vCounts;
}
// collect PO indexes worth visiting
Vec_Int_t * Lms_GiaCollectUsefulCos( Lms_Man_t * p )
{
    Vec_Int_t * vBegins = Vec_IntAlloc( Vec_MemEntryNum(p->vTtMem) );
    Vec_Int_t * vUseful = Vec_IntStartFull( Gia_ManCoNum(p->pGia) + Vec_MemEntryNum(p->vTtMem) );
    Vec_Int_t * vCounts = Lms_GiaCountTruths( p );
    int i, Entry, * pPlace, SumTotal = 0;
    // mark up the place for POs
    Vec_IntForEachEntry( vCounts, Entry, i )
    {
        assert( Entry > 0 );
        Vec_IntPush( vBegins, SumTotal );
        SumTotal += Entry + 1;
//        printf( "%d ", Entry );
    }
    Vec_IntPush( vBegins, SumTotal );
    // fill out POs in their places
    Vec_IntFill( vCounts, Vec_IntSize(vCounts), 0 );
    Vec_IntForEachEntry( p->vTruthIds, Entry, i )
    {
        if ( Entry < 0 )
            continue;
        pPlace = Vec_IntEntryP( vUseful, Vec_IntEntry(vBegins, Entry) + Vec_IntEntry(vCounts, Entry) );
        assert( *pPlace == -1 );
        *pPlace = i;
        Vec_IntAddToEntry( vCounts, Entry, 1 );
    }
    Vec_IntFree( vBegins );
    Vec_IntFree( vCounts );
    return vUseful;
}
// collect non-dominated COs
Vec_Int_t * Lms_GiaFindNonRedundantCos( Lms_Man_t * p )
{
    Vec_Int_t * vRemain;
    Vec_Int_t * vUseful;
    Vec_Wrd_t * vDelays;
    int i, k, EntryI, EntryK;
    word D1, D2;
    vDelays = Lms_GiaDelays( p->pGia );
    vUseful = Lms_GiaCollectUsefulCos( p );
    Vec_IntForEachEntry( vUseful, EntryI, i )
    {
        if ( EntryI < 0 )
            continue;
        D1 = Vec_WrdEntry(vDelays, EntryI);
        assert( D1 > 0 );
        Vec_IntForEachEntryStart( vUseful, EntryK, k, i+1 )
        {
            if ( EntryK == -1 )
                break;
            if ( EntryK == -2 )
                continue;
            D2 = Vec_WrdEntry(vDelays, EntryK);
            assert( D2 > 0 );
            if ( Lms_DelayDom(D1, D2, Gia_ManCiNum(p->pGia)) ) // D1 dominate D2
            {
                Vec_IntWriteEntry( vUseful, k, -2 );
                continue;
            }
            if ( Lms_DelayDom(D2, D1, Gia_ManCiNum(p->pGia)) ) // D2 dominate D1
            {
                Vec_IntWriteEntry( vUseful, i, -2 );
                break;
            }
        }
    }

    vRemain = Vec_IntAlloc( 1000 );
    Vec_IntForEachEntry( vUseful, EntryI, i )
        if ( EntryI >= 0 )
            Vec_IntPush( vRemain, EntryI );
    Vec_IntFree( vUseful );
    Vec_WrdFree( vDelays );
    return vRemain;
}
// replace GIA and vTruthIds by filtered ones
void Lms_GiaNormalize( Lms_Man_t * p )
{
    Gia_Man_t * pGiaNew;
    Gia_Obj_t * pObj;
    Vec_Int_t * vRemain;
    Vec_Int_t * vTruthIdsNew;
    int i, Entry, Prev = -1, Next;
    clock_t clk = clock();
    // collect non-redundant COs
    vRemain = Lms_GiaFindNonRedundantCos( p );
    // change these to be useful literals
    vTruthIdsNew = Vec_IntAlloc( Vec_IntSize(vRemain) );
    Vec_IntForEachEntry( vRemain, Entry, i )
    {
        pObj = Gia_ManCo(p->pGia, Entry);
        assert( Gia_ObjIsAnd(Gia_ObjFanin0(pObj)) );
        Vec_IntWriteEntry( vRemain, i, Gia_ObjFaninLit0p(p->pGia, pObj) );
        // create new truth IDs
        Next = Vec_IntEntry(p->vTruthIds, Gia_ObjCioId(pObj));
        assert( Prev <= Next );
        Vec_IntPush( vTruthIdsNew, Next );
        Prev = Next;
    }
    // create a new GIA
    Gia_ManForEachObj( p->pGia, pObj, i )
        assert( pObj->fMark0 == 0 );
    for ( i = 0; i < Gia_ManCoNum(p->pGia); i++ )
        Gia_ManPatchCoDriver( p->pGia, i, 0 );
    Vec_IntForEachEntry( vRemain, Entry, i )
        Gia_ManAppendCo( p->pGia, Entry );
//    pGiaNew = Gia_ManCleanup( p->pGia );
    pGiaNew = Gia_ManCleanupOutputs( p->pGia, Gia_ManCoNum(p->pGia) - Vec_IntSize(vRemain) );
    Gia_ManStop( p->pGia );
    p->pGia = pGiaNew;
    Vec_IntFree( vRemain );
    // update truth IDs
    Vec_IntFree( p->vTruthIds );
    p->vTruthIds = vTruthIdsNew;
//    Vec_IntPrint( vTruthIdsNew );
    Abc_PrintTime( 1, "Normalization runtime", clock() - clk );
}

/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkRecPs3(int fPrintLib)
{
    Lms_ManPrint( s_pMan3 );

    printf( "Before normalizing\n" );
    Gia_ManPrintStats( s_pMan3->pGia, 0, 0 );

    Lms_GiaNormalize( s_pMan3 );

    printf( "After normalizing\n" );
    Gia_ManPrintStats( s_pMan3->pGia, 0, 0 );
}

/**Function*************************************************************

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkRecIsRunning3()
{
    return s_pMan3 != NULL;
}
Gia_Man_t * Abc_NtkRecGetGia3()
{
    Lms_GiaNormalize( s_pMan3 );
    return s_pMan3->pGia;
}

////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////


ABC_NAMESPACE_IMPL_END