ifTune.c

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#include "if.h"
#include "aig/gia/giaAig.h"
#include "sat/bsat/satStore.h"
#include "sat/cnf/cnf.h"
#include "misc/extra/extra.h"
#include "bool/kit/kit.h"
 
ABC_NAMESPACE_IMPL_START

 
#define IFN_INS    11
#define IFN_WRD  (IFN_INS > 6 ? 1 << (IFN_INS-6) : 1)
#define IFN_PAR  1024
 
// network types
typedef enum { 
    IFN_DSD_NONE = 0,              // 0:  unknown
    IFN_DSD_CONST0,                // 1:  constant
    IFN_DSD_VAR,                   // 2:  variable
    IFN_DSD_AND,                   // 3:  AND
    IFN_DSD_XOR,                   // 4:  XOR
    IFN_DSD_MUX,                   // 5:  MUX
    IFN_DSD_PRIME                  // 6:  PRIME
} Ifn_DsdType_t;
 
// object types
static char * Ifn_Symbs[16] = { 
    NULL,                          // 0:  unknown
    "const",                       // 1:  constant
    "var",                         // 2:  variable
    "()",                          // 3:  AND
    "[]",                          // 4:  XOR
    "<>",                          // 5:  MUX
    "{}"                           // 6:  PRIME
};
 
typedef struct Ifn_Obj_t_  Ifn_Obj_t;
struct Ifn_Obj_t_
{
    unsigned               Type    :  3;      // node type
    unsigned               nFanins :  5;      // fanin counter
    unsigned               iFirst  :  8;      // first parameter
    unsigned               Var     : 16;      // current variable
    int                    Fanins[IFN_INS];   // fanin IDs
};
struct Ifn_Ntk_t_ 
{
    // cell structure
    int                    nInps;             // inputs
    int                    nObjs;             // objects
    Ifn_Obj_t              Nodes[2*IFN_INS];  // nodes
    // constraints
    int                    pConstr[IFN_INS*IFN_INS];  // constraint pairs
    int                    nConstr;           // number of pairs
    // user data
    int                    nVars;             // variables
    int                    nWords;            // truth table words
    int                    nParsVNum;         // selection parameters per variable
    int                    nParsVIni;         // first selection parameter
    int                    nPars;             // total parameters
    word *                 pTruth;            // user truth table
    // matching procedures
    int                    Values[IFN_PAR];            // variable values
    word                   pTtElems[IFN_INS*IFN_WRD];  // elementary truth tables
    word                   pTtObjs[2*IFN_INS*IFN_WRD]; // object truth tables
};
 
static inline word *       Ifn_ElemTruth( Ifn_Ntk_t * p, int i ) { return p->pTtElems + i * Abc_TtWordNum(p->nInps); }
static inline word *       Ifn_ObjTruth( Ifn_Ntk_t * p, int i )  { return p->pTtObjs + i * p->nWords;                }
 
// variable ordering
// - primary inputs            [0;            p->nInps)
// - internal nodes            [p->nInps;     p->nObjs)
// - configuration params      [p->nObjs;     p->nParsVIni)
// - variable selection params [p->nParsVIni; p->nPars)


int Ifn_Prepare( Ifn_Ntk_t * p, word * pTruth, int nVars )
{
    int i, fVerbose = 0;
    assert( nVars <= p->nInps );
    p->pTruth = pTruth;
    p->nVars  = nVars;
    p->nWords = Abc_TtWordNum(nVars);
    p->nPars  = p->nObjs;
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        if ( p->Nodes[i].Type != IFN_DSD_PRIME )
            continue;
        p->Nodes[i].iFirst = p->nPars;
        p->nPars += (1 << p->Nodes[i].nFanins);
        if ( fVerbose )
            printf( "Node %d  Start %d  Vars %d\n", i, p->Nodes[i].iFirst, (1 << p->Nodes[i].nFanins) );
    }
    if ( fVerbose )
        printf( "Groups start %d\n", p->nPars );
    p->nParsVIni = p->nPars;
    p->nParsVNum = Abc_Base2Log(nVars);
    p->nPars    += p->nParsVNum * p->nInps;
    assert( p->nPars <= IFN_PAR );
    memset( p->Values, 0xFF, sizeof(int) * p->nPars );
    return p->nPars;
}
void Ifn_NtkPrint( Ifn_Ntk_t * p )
{
    int i, k; 
    if ( p == NULL )
        printf( "String is empty.\n" );
    if ( p == NULL )
        return;
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        printf( "%c=", 'a'+i );
        printf( "%c", Ifn_Symbs[p->Nodes[i].Type][0] );
        for ( k = 0; k < (int)p->Nodes[i].nFanins; k++ )
            printf( "%c", 'a'+p->Nodes[i].Fanins[k] );
        printf( "%c", Ifn_Symbs[p->Nodes[i].Type][1] );
        printf( ";" );
    }
    printf( "\n" );
}
int Ifn_NtkLutSizeMax( Ifn_Ntk_t * p )
{
    int i, LutSize = 0;
    for ( i = p->nInps; i < p->nObjs; i++ )
        if ( p->Nodes[i].Type == IFN_DSD_PRIME )
            LutSize = Abc_MaxInt( LutSize, (int)p->Nodes[i].nFanins );
    return LutSize;
}
int Ifn_NtkInputNum( Ifn_Ntk_t * p )
{
    return p->nInps;
}

int Ifn_ErrorMessage( const char * format, ...  )
{
    char * pMessage;
    va_list args;
    va_start( args, format );
    pMessage = vnsprintf( format, args );
    va_end( args );
    printf( "%s", pMessage );
    ABC_FREE( pMessage );
    return 0;
}
int Inf_ManOpenSymb( char * pStr )
{
    if ( pStr[0] == '(' )
        return 3;
    if ( pStr[0] == '[' )
        return 4;
    if ( pStr[0] == '<' )
        return 5;
    if ( pStr[0] == '{' )
        return 6;
    return 0;
}
int Ifn_ManStrCheck( char * pStr, int * pnInps, int * pnObjs )
{
    int i, nNodes = 0, Marks[32] = {0}, MaxVar = -1;
    for ( i = 0; pStr[i]; i++ )
    {
        if ( Inf_ManOpenSymb(pStr+i) )
            nNodes++;
        if ( pStr[i] == ';' || 
             pStr[i] == '(' || pStr[i] == ')' || 
             pStr[i] == '[' || pStr[i] == ']' || 
             pStr[i] == '<' || pStr[i] == '>' || 
             pStr[i] == '{' || pStr[i] == '}' )
            continue;
        if ( pStr[i] >= 'A' && pStr[i] <= 'Z' )
            continue;
        if ( pStr[i] >= 'a' && pStr[i] <= 'z' )
        {
            MaxVar = Abc_MaxInt( MaxVar, (int)(pStr[i] - 'a') );
            Marks[pStr[i] - 'a'] = 1;
            continue;
        }
        return Ifn_ErrorMessage( "String \"%s\" contains unrecognized symbol \'%c\'.\n", pStr, pStr[i] );
    }
    for ( i = 0; i <= MaxVar; i++ )
        if ( Marks[i] == 0 )
            return Ifn_ErrorMessage( "String \"%s\" has no symbol \'%c\'.\n", pStr, 'a' + i );
    *pnInps = MaxVar + 1;
    *pnObjs = MaxVar + 1 + nNodes;
    return 1;
}
static inline char * Ifn_NtkParseFindClosingParenthesis( char * pStr, char Open, char Close )
{
    int Counter = 0;
    assert( *pStr == Open );
    for ( ; *pStr; pStr++ )
    {
        if ( *pStr == Open )
            Counter++;
        if ( *pStr == Close )
            Counter--;
        if ( Counter == 0 )
            return pStr;
    }
    return NULL;
}
int Ifn_NtkParseInt_rec( char * pStr, Ifn_Ntk_t * p, char ** ppFinal, int * piNode )
{
    Ifn_Obj_t * pObj;
    int nFanins = 0, pFanins[IFN_INS];
    int Type = Inf_ManOpenSymb( pStr );
    char * pLim = Ifn_NtkParseFindClosingParenthesis( pStr++, Ifn_Symbs[Type][0], Ifn_Symbs[Type][1] );
    *ppFinal = NULL;
    if ( pLim == NULL )
        return Ifn_ErrorMessage( "For symbol \'%c\' cannot find matching symbol \'%c\'.\n", Ifn_Symbs[Type][0], Ifn_Symbs[Type][1] );
    while ( pStr < pLim )
    {
        assert( nFanins < IFN_INS );
        if ( pStr[0] >= 'a' && pStr[0] <= 'z' )
            pFanins[nFanins++] = pStr[0] - 'a', pStr++; 
        else if ( Inf_ManOpenSymb(pStr) )
        {
            if ( !Ifn_NtkParseInt_rec( pStr, p, &pStr, piNode ) )
                return 0;
            pFanins[nFanins++] = *piNode - 1;
        }
        else
            return Ifn_ErrorMessage( "Substring \"%s\" contains unrecognized symbol \'%c\'.\n", pStr, pStr[0] );
    }
    assert( pStr == pLim );
    pObj = p->Nodes + (*piNode)++;
    pObj->Type = Type;
    assert( pObj->nFanins == 0 );
    pObj->nFanins = nFanins;
    memcpy( pObj->Fanins, pFanins, sizeof(int) * nFanins );
    *ppFinal = pLim + 1;
    if ( Type == IFN_DSD_MUX && nFanins != 3 )
        return Ifn_ErrorMessage( "MUX should have exactly three fanins.\n" );
    return 1;
}
int Ifn_NtkParseInt( char * pStr, Ifn_Ntk_t * p )
{
    char * pFinal; int iNode;
    if ( !Ifn_ManStrCheck(pStr, &p->nInps, &p->nObjs) )
        return 0;
    if ( p->nInps > IFN_INS )
        return Ifn_ErrorMessage( "The number of variables (%d) exceeds predefined limit (%d). Recompile with different value of IFN_INS.\n", p->nInps, IFN_INS );
    assert( p->nInps > 1 && p->nInps < p->nObjs && p->nInps <= IFN_INS && p->nObjs < 2*IFN_INS );
    if ( !Inf_ManOpenSymb(pStr) )
        return Ifn_ErrorMessage( "The first symbol should be one of the symbols: (, [, <, {.\n" );
    iNode = p->nInps;
    if ( !Ifn_NtkParseInt_rec( pStr, p, &pFinal, &iNode ) )
        return 0;
    if ( pFinal[0] && pFinal[0] != ';' )
        return Ifn_ErrorMessage( "The last symbol should be \';\'.\n" );
    if ( iNode != p->nObjs )
        return Ifn_ErrorMessage( "Mismatch in the number of nodes.\n" );
    return 1;
}

int Ifn_ManStrType2( char * pStr )
{
    int i;
    for ( i = 0; pStr[i]; i++ )
        if ( pStr[i] == '=' )
            return 1;
    return 0;
}
int Ifn_ManStrCheck2( char * pStr, int * pnInps, int * pnObjs )
{
    int i, Marks[32] = {0}, MaxVar = 0, MaxDef = 0;
    for ( i = 0; pStr[i]; i++ )
    {
        if ( pStr[i] == '=' || pStr[i] == ';' || 
             pStr[i] == '(' || pStr[i] == ')' || 
             pStr[i] == '[' || pStr[i] == ']' || 
             pStr[i] == '<' || pStr[i] == '>' || 
             pStr[i] == '{' || pStr[i] == '}' )
            continue;
        if ( pStr[i] >= 'A' && pStr[i] <= 'Z' )
            continue;
        if ( pStr[i] >= 'a' && pStr[i] <= 'z' )
        {
            if ( pStr[i+1] == '=' )
                Marks[pStr[i] - 'a'] = 2, MaxDef = Abc_MaxInt(MaxDef, pStr[i] - 'a');
            continue;
        }
        return Ifn_ErrorMessage( "String \"%s\" contains unrecognized symbol \'%c\'.\n", pStr, pStr[i] );
    }
    for ( i = 0; pStr[i]; i++ )
    {
        if ( pStr[i] == '=' || pStr[i] == ';' || 
             pStr[i] == '(' || pStr[i] == ')' || 
             pStr[i] == '[' || pStr[i] == ']' || 
             pStr[i] == '<' || pStr[i] == '>' || 
             pStr[i] == '{' || pStr[i] == '}' )
            continue;
        if ( pStr[i] >= 'A' && pStr[i] <= 'Z' )
            continue;
        if ( pStr[i] >= 'a' && pStr[i] <= 'z' )
        {
            if ( pStr[i+1] != '=' && Marks[pStr[i] - 'a'] != 2 )
                Marks[pStr[i] - 'a'] = 1, MaxVar = Abc_MaxInt(MaxVar, pStr[i] - 'a');
            continue;
        }
        return Ifn_ErrorMessage( "String \"%s\" contains unrecognized symbol \'%c\'.\n", pStr, pStr[i] );
    }
    MaxVar++;
    MaxDef++;
    for ( i = 0; i < MaxDef; i++ )
        if ( Marks[i] == 0 )
            return Ifn_ErrorMessage( "String \"%s\" has no symbol \'%c\'.\n", pStr, 'a' + i );
    for ( i = 0; i < MaxVar; i++ )
        if ( Marks[i] == 2 )
            return Ifn_ErrorMessage( "String \"%s\" has definition of input variable \'%c\'.\n", pStr, 'a' + i );
    for ( i = MaxVar; i < MaxDef; i++ )
        if ( Marks[i] == 1 )
            return Ifn_ErrorMessage( "String \"%s\" has no definition for internal variable \'%c\'.\n", pStr, 'a' + i );
    *pnInps = MaxVar;
    *pnObjs = MaxDef;
    return 1;
}
int Ifn_NtkParseInt2( char * pStr, Ifn_Ntk_t * p )
{
    int i, k, n, f, nFans, iFan;
    if ( !Ifn_ManStrCheck2(pStr, &p->nInps, &p->nObjs) )
        return 0;
    if ( p->nInps > IFN_INS )
        return Ifn_ErrorMessage( "The number of variables (%d) exceeds predefined limit (%d). Recompile with different value of IFN_INS.\n", p->nInps, IFN_INS );
    assert( p->nInps > 1 && p->nInps < p->nObjs && p->nInps <= IFN_INS && p->nObjs < 2*IFN_INS );
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        char Next = 0;
        for ( k = 0; pStr[k]; k++ )
            if ( pStr[k] == 'a' + i && pStr[k+1] == '=' )
                break;
        if ( pStr[k] == 0 )
            return Ifn_ErrorMessage( "Cannot find definition of signal \'%c\'.\n", 'a' + i );
        if ( pStr[k+2] == '(' )
            p->Nodes[i].Type = IFN_DSD_AND, Next = ')';
        else if ( pStr[k+2] == '[' )
            p->Nodes[i].Type = IFN_DSD_XOR, Next = ']';
        else if ( pStr[k+2] == '<' )
            p->Nodes[i].Type = IFN_DSD_MUX, Next = '>';
        else if ( pStr[k+2] == '{' )
            p->Nodes[i].Type = IFN_DSD_PRIME, Next = '}';
        else 
            return Ifn_ErrorMessage( "Cannot find opening operation symbol in the definition of signal \'%c\'.\n", 'a' + i );
        for ( n = k + 3; pStr[n]; n++ )
            if ( pStr[n] == Next )
                break;
        if ( pStr[n] == 0 )
            return Ifn_ErrorMessage( "Cannot find closing operation symbol in the definition of signal \'%c\'.\n", 'a' + i );
        nFans = n - k - 3;
        if ( nFans > 8 )
            return Ifn_ErrorMessage( "Cannot find matching operation symbol in the definition of signal \'%c\'.\n", 'a' + i );
        for ( f = 0; f < nFans; f++ )
        {
            iFan = pStr[k + 3 + f] - 'a';
            if ( iFan < 0 || iFan >= i )
                return Ifn_ErrorMessage( "Fanin number %d is signal %d is out of range.\n", f, 'a' + i );
            p->Nodes[i].Fanins[f] = iFan;
        }
        p->Nodes[i].nFanins = nFans;
    }
    return 1;
}
void Ifn_NtkParseConstraints( char * pStr, Ifn_Ntk_t * p )
{
    int i, k;
    // parse constraints
    p->nConstr = 0;
    for ( i = 0; i < p->nInps; i++ )
        for ( k = 0; pStr[k]; k++ )
            if ( pStr[k] == 'A' + i && pStr[k-1] == ';' )
            {
                assert( p->nConstr < IFN_INS*IFN_INS );
                p->pConstr[p->nConstr++] = ((int)(pStr[k] - 'A') << 16) | (int)(pStr[k+1] - 'A');
//                printf( "Added constraint (%c < %c)\n", pStr[k], pStr[k+1] );
            }
//    if ( p->nConstr )
//        printf( "Total constraints = %d\n", p->nConstr );
}
 
Ifn_Ntk_t * Ifn_NtkParse( char * pStr )
{
    Ifn_Ntk_t * p = ABC_CALLOC( Ifn_Ntk_t, 1 );
    if ( Ifn_ManStrType2(pStr) )
    {
        if ( !Ifn_NtkParseInt2( pStr, p ) )
        {
            ABC_FREE( p );
            return NULL;
        }
    }
    else
    {
        if ( !Ifn_NtkParseInt( pStr, p ) )
        {
            ABC_FREE( p );
            return NULL;
        }
    }
    Ifn_NtkParseConstraints( pStr, p );
    Abc_TtElemInit2( p->pTtElems, p->nInps );
//    printf( "Finished parsing: " ); Ifn_NtkPrint(p);
    return p;
}
int Ifn_NtkTtBits( char * pStr )
{
    int i, Counter = 0;
    Ifn_Ntk_t * pNtk = Ifn_NtkParse( pStr );
    for ( i = pNtk->nInps; i < pNtk->nObjs; i++ )
        if ( pNtk->Nodes[i].Type == IFN_DSD_PRIME )
            Counter += (1 << pNtk->Nodes[i].nFanins);
    ABC_FREE( pNtk );
    return Counter;
}
 
 

Gia_Man_t * Ifn_ManStrFindModel( Ifn_Ntk_t * p )
{
    Gia_Man_t * pNew, * pTemp;
    int i, k, iLit, * pVarMap = ABC_FALLOC( int, p->nParsVIni );
    pNew = Gia_ManStart( 1000 );
    pNew->pName = Abc_UtilStrsav( "model" );
    Gia_ManHashStart( pNew );
    for ( i = 0; i < p->nInps; i++ )
        pVarMap[i] = Gia_ManAppendCi(pNew);
    for ( i = p->nObjs; i < p->nParsVIni; i++ )
        pVarMap[i] = Gia_ManAppendCi(pNew);
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        int Type = p->Nodes[i].Type;
        int nFans = p->Nodes[i].nFanins;
        int * pFans = p->Nodes[i].Fanins;
        int iFanin = p->Nodes[i].iFirst;
        if ( Type == IFN_DSD_AND )
        {
            iLit = 1;
            for ( k = 0; k < nFans; k++ )
                iLit = Gia_ManHashAnd( pNew, iLit, pVarMap[pFans[k]] );
            pVarMap[i] = iLit;
        }
        else if ( Type == IFN_DSD_XOR )
        {
            iLit = 0;
            for ( k = 0; k < nFans; k++ )
                iLit = Gia_ManHashXor( pNew, iLit, pVarMap[pFans[k]] );
            pVarMap[i] = iLit;
        }
        else if ( Type == IFN_DSD_MUX )
        {
            assert( nFans == 3 );
            pVarMap[i] = Gia_ManHashMux( pNew, pVarMap[pFans[0]], pVarMap[pFans[1]], pVarMap[pFans[2]] );
        }
        else if ( Type == IFN_DSD_PRIME )
        {
            int n, Step, pVarsData[256];
            int nMints = (1 << nFans);
            assert( nFans >= 0 && nFans <= 8 );
            for ( k = 0; k < nMints; k++ )
                pVarsData[k] = pVarMap[iFanin + k];
            for ( Step = 1, k = 0; k < nFans; k++, Step <<= 1 )
                for ( n = 0; n < nMints; n += Step << 1 )
                    pVarsData[n] = Gia_ManHashMux( pNew, pVarMap[pFans[k]], pVarsData[n+Step], pVarsData[n] );
            assert( Step == nMints );
            pVarMap[i] = pVarsData[0];
        }
        else assert( 0 );
    }
    Gia_ManAppendCo( pNew, pVarMap[p->nObjs-1] );
    ABC_FREE( pVarMap );
    pNew = Gia_ManCleanup( pTemp = pNew );
    Gia_ManStop( pTemp );
    assert( Gia_ManPiNum(pNew) == p->nParsVIni - (p->nObjs - p->nInps) );
    assert( Gia_ManPoNum(pNew) == 1 );
    return pNew;
}
// compute cofactors w.r.t. the first nIns variables
Gia_Man_t * Ifn_ManStrFindCofactors( int nIns, Gia_Man_t * p )
{
    Gia_Man_t * pNew, * pTemp; 
    Gia_Obj_t * pObj;
    int i, m, nMints = 1 << nIns;
    pNew = Gia_ManStart( Gia_ManObjNum(p) );
    pNew->pName = Abc_UtilStrsav( p->pName );
    Gia_ManHashAlloc( pNew );
    Gia_ManConst0(p)->Value = 0;
    Gia_ManForEachCi( p, pObj, i )
        if ( i >= nIns )
            pObj->Value = Gia_ManAppendCi( pNew );
    for ( m = 0; m < nMints; m++ )
    {
        Gia_ManForEachCi( p, pObj, i )
            if ( i < nIns )
                pObj->Value = ((m >> i) & 1);
        Gia_ManForEachAnd( p, pObj, i )
            pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
        Gia_ManForEachPo( p, pObj, i )
            pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
    }
    pNew = Gia_ManCleanup( pTemp = pNew );
    Gia_ManStop( pTemp );
    return pNew;
}

static inline Cnf_Dat_t * Cnf_DeriveGiaRemapped( Gia_Man_t * p )
{
    Cnf_Dat_t * pCnf;
    Aig_Man_t * pAig = Gia_ManToAigSimple( p );
    pAig->nRegs = 0;
    pCnf = Cnf_Derive( pAig, Aig_ManCoNum(pAig) );
    Aig_ManStop( pAig );
    return pCnf;
}
sat_solver * Ifn_ManStrFindSolver( Gia_Man_t * p, Vec_Int_t ** pvPiVars, Vec_Int_t ** pvPoVars )
{
    sat_solver * pSat;
    Gia_Obj_t * pObj;
    Cnf_Dat_t * pCnf;
    int i;    
    pCnf = Cnf_DeriveGiaRemapped( p );
    // start the SAT solver
    pSat = sat_solver_new();
    sat_solver_setnvars( pSat, pCnf->nVars );
    // add timeframe clauses
    for ( i = 0; i < pCnf->nClauses; i++ )
        if ( !sat_solver_addclause( pSat, pCnf->pClauses[i], pCnf->pClauses[i+1] ) )
            assert( 0 );
    // inputs/outputs
    *pvPiVars = Vec_IntAlloc( Gia_ManPiNum(p) );
    Gia_ManForEachCi( p, pObj, i )
        Vec_IntPush( *pvPiVars, pCnf->pVarNums[Gia_ObjId(p, pObj)] );
    *pvPoVars = Vec_IntAlloc( Gia_ManPoNum(p) );
    Gia_ManForEachCo( p, pObj, i )
        Vec_IntPush( *pvPoVars, pCnf->pVarNums[Gia_ObjId(p, pObj)] );
    Cnf_DataFree( pCnf );
    return pSat;
}
sat_solver * Ifn_ManSatBuild( Ifn_Ntk_t * p, Vec_Int_t ** pvPiVars, Vec_Int_t ** pvPoVars )
{
    Gia_Man_t * p1, * p2;
    sat_solver * pSat = NULL;
    *pvPiVars = *pvPoVars = NULL;
    p1 = Ifn_ManStrFindModel( p );
//    Gia_AigerWrite( p1, "satbuild.aig", 0, 0, 0 );
    p2 = Ifn_ManStrFindCofactors( p->nInps, p1 );
    Gia_ManStop( p1 );
//    Gia_AigerWrite( p2, "satbuild2.aig", 0, 0, 0 );
    pSat = Ifn_ManStrFindSolver( p2, pvPiVars, pvPoVars );
    Gia_ManStop( p2 );
    return pSat;
}
void * If_ManSatBuildFromCell( char * pStr, Vec_Int_t ** pvPiVars, Vec_Int_t ** pvPoVars, Ifn_Ntk_t ** ppNtk )
{
    Ifn_Ntk_t * p = Ifn_NtkParse( pStr );
    Ifn_Prepare( p, NULL, p->nInps );
    *ppNtk = p;
    if ( p == NULL )
        return NULL;
//    Ifn_NtkPrint( p );
    return Ifn_ManSatBuild( p, pvPiVars, pvPoVars );
}

void Ifn_ManSatPrintPerm( char * pPerms, int nVars )
{
    int i;
    for ( i = 0; i < nVars; i++ )
        printf( "%c", 'a' + pPerms[i] );
    printf( "\n" );
}
int Ifn_ManSatCheckOne( sat_solver * pSat, Vec_Int_t * vPoVars, word * pTruth, int nVars, int * pPerm, int nInps, Vec_Int_t * vLits )
{
    int v, Value, m, mNew, nMints = (1 << nVars); // (1 << nInps);
    assert( (1 << nInps) == Vec_IntSize(vPoVars) );
    assert( nVars <= nInps );
    // remap minterms
    Vec_IntFill( vLits, Vec_IntSize(vPoVars), -1 );
    for ( m = 0; m < nMints; m++ )
    {
        mNew = 0;
        for ( v = 0; v < nInps; v++ )
        {
            assert( pPerm[v] < nVars );
            if ( ((m >> pPerm[v]) & 1) )
                mNew |= (1 << v);
        }
        assert( Vec_IntEntry(vLits, mNew) == -1 );
        Vec_IntWriteEntry( vLits, mNew, Abc_TtGetBit(pTruth, m) );
    }
    // find assumptions
    v = 0;
    Vec_IntForEachEntry( vLits, Value, m )
        if ( Value >= 0 )
            Vec_IntWriteEntry( vLits, v++, Abc_Var2Lit(Vec_IntEntry(vPoVars, m), !Value) );
    Vec_IntShrink( vLits, v );
    // run SAT solver
    Value = sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits), 0, 0, 0, 0 );
    return (int)(Value == l_True);
}
void Ifn_ManSatDeriveOne( sat_solver * pSat, Vec_Int_t * vPiVars, Vec_Int_t * vValues )
{
    int i, iVar;
    Vec_IntClear( vValues );
    Vec_IntForEachEntry( vPiVars, iVar, i )
        Vec_IntPush( vValues, sat_solver_var_value(pSat, iVar) );
}
int If_ManSatFindCofigBits( void * pSat, Vec_Int_t * vPiVars, Vec_Int_t * vPoVars, word * pTruth, int nVars, word Perm, int nInps, Vec_Int_t * vValues )
{
    // extract permutation
    int RetValue, i, pPerm[IF_MAX_FUNC_LUTSIZE];
    assert( nInps <= IF_MAX_FUNC_LUTSIZE );
    for ( i = 0; i < nInps; i++ )
    {
        pPerm[i] = Abc_TtGetHex( &Perm, i );
        assert( pPerm[i] < nVars );
    }
    // perform SAT check 
    RetValue = Ifn_ManSatCheckOne( (sat_solver *)pSat, vPoVars, pTruth, nVars, pPerm, nInps, vValues );
    Vec_IntClear( vValues );
    if ( RetValue == 0 )
        return 0;
    Ifn_ManSatDeriveOne( (sat_solver*)pSat, vPiVars, vValues );
    return 1;
}
int Ifn_ManSatFindCofigBitsTest( Ifn_Ntk_t * p, word * pTruth, int nVars, word Perm )
{
    Vec_Int_t * vValues = Vec_IntAlloc( 100 );
    Vec_Int_t * vPiVars, * vPoVars;
    sat_solver * pSat = Ifn_ManSatBuild( p, &vPiVars, &vPoVars );
    int RetValue = If_ManSatFindCofigBits( pSat, vPiVars, vPoVars, pTruth, nVars, Perm, p->nInps, vValues );
    Vec_IntPrint( vValues );
    // cleanup
    sat_solver_delete( pSat );
    Vec_IntFreeP( &vPiVars );
    Vec_IntFreeP( &vPoVars );
    Vec_IntFreeP( &vValues );
    return RetValue;
}

int If_ManSatDeriveGiaFromBits( void * pGia, Ifn_Ntk_t * p, word * pConfigData, Vec_Int_t * vLeaves, Vec_Int_t * vCover )
{
    Gia_Man_t * pNew = (Gia_Man_t *)pGia;
    int i, k, iLit, iVar = 0, nVarsNew, pVarMap[1000];
    int nTtBits = p->nParsVIni - p->nObjs;
    int nPermBits = Abc_Base2Log(p->nInps + 1) + 1;
    int fCompl = Abc_TtGetBit( pConfigData, nTtBits + nPermBits * p->nInps );
    assert( Vec_IntSize(vLeaves) <= p->nInps && p->nParsVIni < 1000 );
    for ( i = 0; i < p->nInps; i++ )
    {
        for ( iLit = k = 0; k < nPermBits; k++ )
            if ( Abc_TtGetBit(pConfigData, nTtBits + i * nPermBits + k) )
                iLit |= (1 << k);
        assert( Abc_Lit2Var(iLit) < Vec_IntSize(vLeaves) );
        pVarMap[i] = Abc_Lit2LitL( Vec_IntArray(vLeaves), iLit );
    }
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        int Type = p->Nodes[i].Type;
        int nFans = p->Nodes[i].nFanins;
        int * pFans = p->Nodes[i].Fanins;
        //int iFanin = p->Nodes[i].iFirst;
        assert( nFans <= 6 );
        if ( Type == IFN_DSD_AND )
        {
            iLit = 1;
            for ( k = 0; k < nFans; k++ )
                iLit = Gia_ManHashAnd( pNew, iLit, pVarMap[pFans[k]] );
            pVarMap[i] = iLit;
        }
        else if ( Type == IFN_DSD_XOR )
        {
            iLit = 0;
            for ( k = 0; k < nFans; k++ )
                iLit = Gia_ManHashXor( pNew, iLit, pVarMap[pFans[k]] );
            pVarMap[i] = iLit;
        }
        else if ( Type == IFN_DSD_MUX )
        {
            assert( nFans == 3 );
            pVarMap[i] = Gia_ManHashMux( pNew, pVarMap[pFans[0]], pVarMap[pFans[1]], pVarMap[pFans[2]] );
        }
        else if ( Type == IFN_DSD_PRIME )
        {
            int pFaninLits[16];
            // collect truth table
            word uTruth = 0;
            int nMints = (1 << nFans);
            for ( k = 0; k < nMints; k++ )
                if ( Abc_TtGetBit(pConfigData, iVar++) )
                    uTruth |= ((word)1 << k);
            uTruth = Abc_Tt6Stretch( uTruth, nFans );
            // collect function
            for ( k = 0; k < nFans; k++ )
                pFaninLits[k] = pVarMap[pFans[k]];
            // implement the function
            nVarsNew = Abc_TtMinBase( &uTruth, pFaninLits, nFans, 6 );
            if ( nVarsNew == 0 )
                pVarMap[i] = (int)(uTruth & 1);
            else
            {
                extern int Kit_TruthToGia( Gia_Man_t * pMan, unsigned * pTruth, int nVars, Vec_Int_t * vMemory, Vec_Int_t * vLeaves, int fHash );
                Vec_Int_t Leaves = { nVarsNew, nVarsNew, pFaninLits };
                pVarMap[i] = Kit_TruthToGia( pNew, (unsigned *)&uTruth, nVarsNew, vCover, &Leaves, 1 ); // hashing enabled!!!
            }
        }
        else assert( 0 );
    }
    assert( iVar == nTtBits );
    return Abc_LitNotCond( pVarMap[p->nObjs - 1], fCompl );
}

void * If_ManDeriveGiaFromCells( void * pGia )
{
    Gia_Man_t * p = (Gia_Man_t *)pGia;
    Gia_Man_t * pNew, * pTemp;
    Vec_Int_t * vCover, * vLeaves;
    Ifn_Ntk_t * pNtkCell;
    Gia_Obj_t * pObj; 
    word * pConfigData;
    //word * pTruth;
    int k, i, iLut, iVar;
    int nConfigInts, Count = 0;
    assert( p->vConfigs != NULL );
    assert( p->pCellStr != NULL );
    assert( Gia_ManHasMapping(p) );
    // derive cell network
    pNtkCell = Ifn_NtkParse( p->pCellStr );
    Ifn_Prepare( pNtkCell, NULL, pNtkCell->nInps );
    nConfigInts = Vec_IntEntry( p->vConfigs, 1 );
    // create new manager
    pNew = Gia_ManStart( 6*Gia_ManObjNum(p)/5 + 100 );
    pNew->pName = Abc_UtilStrsav( p->pName );
    pNew->pSpec = Abc_UtilStrsav( p->pSpec );
    // map primary inputs
    Gia_ManFillValue(p);
    Gia_ManConst0(p)->Value = 0;
    Gia_ManForEachCi( p, pObj, i )
        pObj->Value = Gia_ManAppendCi(pNew);
    // iterate through nodes used in the mapping
    vLeaves = Vec_IntAlloc( 16 );
    vCover  = Vec_IntAlloc( 1 << 16 );
    Gia_ManHashStart( pNew );
    //Gia_ObjComputeTruthTableStart( p, Gia_ManLutSizeMax(p) );
    Gia_ManForEachAnd( p, pObj, iLut )
    {
        if ( Gia_ObjIsBuf(pObj) )
        {
            pObj->Value = Gia_ManAppendBuf( pNew, Gia_ObjFanin0Copy(pObj) );
            continue;
        }
        if ( !Gia_ObjIsLut(p, iLut) )
            continue;
        // collect leaves
        //Vec_IntClear( vLeaves );
        //Gia_LutForEachFanin( p, iLut, iVar, k )
        //    Vec_IntPush( vLeaves, iVar );
        //pTruth = Gia_ObjComputeTruthTableCut( p, Gia_ManObj(p, iLut), vLeaves );
        // collect incoming literals
        Vec_IntClear( vLeaves );
        Gia_LutForEachFanin( p, iLut, iVar, k )
            Vec_IntPush( vLeaves, Gia_ManObj(p, iVar)->Value );
        pConfigData = (word *)Vec_IntEntryP( p->vConfigs, 2 + nConfigInts * Count++ );
        Gia_ManObj(p, iLut)->Value = If_ManSatDeriveGiaFromBits( pNew, pNtkCell, pConfigData, vLeaves, vCover );
    }
    assert( Vec_IntEntry(p->vConfigs, 0) == Count );
    assert( Vec_IntSize(p->vConfigs) == 2 + nConfigInts * Count );
    //Gia_ObjComputeTruthTableStop( p );
    Gia_ManForEachCo( p, pObj, i )
        pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
    Gia_ManHashStop( pNew );
    Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
    Vec_IntFree( vLeaves );
    Vec_IntFree( vCover );
    ABC_FREE( pNtkCell );
    // perform cleanup
    pNew = Gia_ManCleanup( pTemp = pNew );
    Gia_ManStop( pTemp );
    return pNew;
 
}

word * Ifn_NtkDeriveTruth( Ifn_Ntk_t * p, int * pValues )
{
    int i, v, f, iVar, iStart;
    // elementary variables
    for ( i = 0; i < p->nInps; i++ )
    {
        // find variable
        iStart = p->nParsVIni + i * p->nParsVNum;
        for ( v = iVar = 0; v < p->nParsVNum; v++ )
            if ( p->Values[iStart+v] )
                iVar += (1 << v);
        // assign variable
        Abc_TtCopy( Ifn_ObjTruth(p, i), Ifn_ElemTruth(p, iVar), p->nWords, 0 );
    }
    // internal variables
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        int nFans = p->Nodes[i].nFanins;
        int * pFans = p->Nodes[i].Fanins;
        word * pTruth = Ifn_ObjTruth( p, i );
        if ( p->Nodes[i].Type == IFN_DSD_AND )
        {
            Abc_TtFill( pTruth, p->nWords );
            for ( f = 0; f < nFans; f++ )
                Abc_TtAnd( pTruth, pTruth, Ifn_ObjTruth(p, pFans[f]), p->nWords, 0 );
        }
        else if ( p->Nodes[i].Type == IFN_DSD_XOR )
        {
            Abc_TtClear( pTruth, p->nWords );
            for ( f = 0; f < nFans; f++ )
                Abc_TtXor( pTruth, pTruth, Ifn_ObjTruth(p, pFans[f]), p->nWords, 0 );
        }
        else if ( p->Nodes[i].Type == IFN_DSD_MUX )
        {
            assert( nFans == 3 );
            Abc_TtMux( pTruth, Ifn_ObjTruth(p, pFans[0]), Ifn_ObjTruth(p, pFans[1]), Ifn_ObjTruth(p, pFans[2]), p->nWords );
        }
        else if ( p->Nodes[i].Type == IFN_DSD_PRIME )
        {
            int nValues = (1 << nFans);
            word * pTemp = Ifn_ObjTruth(p, p->nObjs);
            Abc_TtClear( pTruth, p->nWords );
            for ( v = 0; v < nValues; v++ )
            {
                if ( pValues[p->Nodes[i].iFirst + v] == 0 )
                    continue;
                Abc_TtFill( pTemp, p->nWords );
                for ( f = 0; f < nFans; f++ )
                    if ( (v >> f) & 1 )
                        Abc_TtAnd( pTemp, pTemp, Ifn_ObjTruth(p, pFans[f]), p->nWords, 0 );
                    else
                        Abc_TtSharp( pTemp, pTemp, Ifn_ObjTruth(p, pFans[f]), p->nWords );
                Abc_TtOr( pTruth, pTruth, pTemp, p->nWords );
            }
        }
        else assert( 0 );
//Dau_DsdPrintFromTruth( pTruth, p->nVars );
    }
    return Ifn_ObjTruth(p, p->nObjs-1);
}

void Ifn_TtComparisonConstr( word * pTruth, int nVars, int fMore, int fEqual )
{
    word Cond[4], Equa[4], Temp[4];
    word s_TtElems[8][4] = {
        { ABC_CONST(0xAAAAAAAAAAAAAAAA),ABC_CONST(0xAAAAAAAAAAAAAAAA),ABC_CONST(0xAAAAAAAAAAAAAAAA),ABC_CONST(0xAAAAAAAAAAAAAAAA) },
        { ABC_CONST(0xCCCCCCCCCCCCCCCC),ABC_CONST(0xCCCCCCCCCCCCCCCC),ABC_CONST(0xCCCCCCCCCCCCCCCC),ABC_CONST(0xCCCCCCCCCCCCCCCC) },
        { ABC_CONST(0xF0F0F0F0F0F0F0F0),ABC_CONST(0xF0F0F0F0F0F0F0F0),ABC_CONST(0xF0F0F0F0F0F0F0F0),ABC_CONST(0xF0F0F0F0F0F0F0F0) },
        { ABC_CONST(0xFF00FF00FF00FF00),ABC_CONST(0xFF00FF00FF00FF00),ABC_CONST(0xFF00FF00FF00FF00),ABC_CONST(0xFF00FF00FF00FF00) },
        { ABC_CONST(0xFFFF0000FFFF0000),ABC_CONST(0xFFFF0000FFFF0000),ABC_CONST(0xFFFF0000FFFF0000),ABC_CONST(0xFFFF0000FFFF0000) },
        { ABC_CONST(0xFFFFFFFF00000000),ABC_CONST(0xFFFFFFFF00000000),ABC_CONST(0xFFFFFFFF00000000),ABC_CONST(0xFFFFFFFF00000000) },
        { ABC_CONST(0x0000000000000000),ABC_CONST(0xFFFFFFFFFFFFFFFF),ABC_CONST(0x0000000000000000),ABC_CONST(0xFFFFFFFFFFFFFFFF) },
        { ABC_CONST(0x0000000000000000),ABC_CONST(0x0000000000000000),ABC_CONST(0xFFFFFFFFFFFFFFFF),ABC_CONST(0xFFFFFFFFFFFFFFFF) }
    };
    int i, nWords = Abc_TtWordNum(2*nVars);
    assert( nVars > 0 && nVars <= 4 );
    Abc_TtClear( pTruth, nWords );
    Abc_TtFill( Equa, nWords );
    for ( i = nVars - 1; i >= 0; i-- )
    {
        if ( fMore )
            Abc_TtSharp( Cond, s_TtElems[2*i+1], s_TtElems[2*i+0], nWords );
        else
            Abc_TtSharp( Cond, s_TtElems[2*i+0], s_TtElems[2*i+1], nWords );
        Abc_TtAnd( Temp, Equa, Cond, nWords, 0 );
        Abc_TtOr( pTruth, pTruth, Temp, nWords );
        Abc_TtXor( Temp, s_TtElems[2*i+0], s_TtElems[2*i+1], nWords, 1 );
        Abc_TtAnd( Equa, Equa, Temp, nWords, 0 );
    }
    if ( fEqual )
        Abc_TtNot( pTruth, nWords );
}

int Ifn_AddClause( sat_solver * pSat, int * pBeg, int * pEnd )
{
    int fVerbose = 0;
    int RetValue = sat_solver_addclause( pSat, pBeg, pEnd );
    if ( fVerbose )
    {
        for ( ; pBeg < pEnd; pBeg++ )
            printf( "%c%d ", Abc_LitIsCompl(*pBeg) ? '-':'+', Abc_Lit2Var(*pBeg) );
        printf( "\n" );
    }
    return RetValue;
}
void Ifn_NtkAddConstrOne( sat_solver * pSat, Vec_Int_t * vCover, int * pVars, int nVars )
{
    int RetValue, k, c, Cube, Literal, nLits, pLits[IFN_INS];
    Vec_IntForEachEntry( vCover, Cube, c )
    {
        nLits = 0;
        for ( k = 0; k < nVars; k++ )
        {
            Literal = 3 & (Cube >> (k << 1));
            if ( Literal == 1 )      // '0'  -> pos lit
                pLits[nLits++] = Abc_Var2Lit(pVars[k], 0);
            else if ( Literal == 2 ) // '1'  -> neg lit
                pLits[nLits++] = Abc_Var2Lit(pVars[k], 1);
            else if ( Literal != 0 )
                assert( 0 );
        }
        RetValue = Ifn_AddClause( pSat, pLits, pLits + nLits );
        assert( RetValue );
    }
}
void Ifn_NtkAddConstraints( Ifn_Ntk_t * p, sat_solver * pSat )
{
    int fAddConstr = 1;
    Vec_Int_t * vCover = Vec_IntAlloc( 0 );
    word uTruth = Abc_Tt6Stretch( ~Abc_Tt6Mask(p->nVars), p->nParsVNum );
    assert( p->nParsVNum <= 4 );
    if ( uTruth )
    {
        int i, k, pVars[IFN_INS];
        int RetValue = Kit_TruthIsop( (unsigned *)&uTruth, p->nParsVNum, vCover, 0 );
        assert( RetValue == 0 );
//        Dau_DsdPrintFromTruth( &uTruth, p->nParsVNum );
        // add capacity constraints
        for ( i = 0; i < p->nInps; i++ )
        {
            for ( k = 0; k < p->nParsVNum; k++ )
                pVars[k] = p->nParsVIni + i * p->nParsVNum + k;
            Ifn_NtkAddConstrOne( pSat, vCover, pVars, p->nParsVNum );
        }
    }
    // ordering constraints
    if ( fAddConstr && p->nConstr )
    {
        word pTruth[4];
        int i, k, RetValue, pVars[2*IFN_INS];
        int fForceDiff = (p->nVars == p->nInps);
        Ifn_TtComparisonConstr( pTruth, p->nParsVNum, fForceDiff, fForceDiff );
        RetValue = Kit_TruthIsop( (unsigned *)pTruth, 2*p->nParsVNum, vCover, 0 );
        assert( RetValue == 0 );
//        Kit_TruthIsopPrintCover( vCover, 2*p->nParsVNum, 0 );
        for ( i = 0; i < p->nConstr; i++ )
        {
            int iVar1 = p->pConstr[i] >> 16;
            int iVar2 = p->pConstr[i] & 0xFFFF;
            for ( k = 0; k < p->nParsVNum; k++ )
            {
                pVars[2*k+0] = p->nParsVIni + iVar1 * p->nParsVNum + k;
                pVars[2*k+1] = p->nParsVIni + iVar2 * p->nParsVNum + k;
            }
            Ifn_NtkAddConstrOne( pSat, vCover, pVars, 2*p->nParsVNum );
//            printf( "added constraint with %d clauses for %d and %d\n", Vec_IntSize(vCover), iVar1, iVar2 );
        }
    }
    Vec_IntFree( vCover );
}

int Ifn_NtkAddClauses( Ifn_Ntk_t * p, int * pValues, sat_solver * pSat )
{
    int i, f, v, nLits, pLits[IFN_INS+2], pLits2[IFN_INS+2];
    // assign new variables
    int nSatVars = sat_solver_nvars(pSat);
//    for ( i = 0; i < p->nObjs-1; i++ )
    for ( i = 0; i < p->nObjs; i++ )
        p->Nodes[i].Var = nSatVars++;
    //p->Nodes[p->nObjs-1].Var = 0xFFFF;
    sat_solver_setnvars( pSat, nSatVars );
    // verify variable values
    for ( i = 0; i < p->nVars; i++ )
        assert( pValues[i] != -1 );
    for ( i = p->nVars; i < p->nObjs-1; i++ )
        assert( pValues[i] == -1 );
    assert( pValues[p->nObjs-1] != -1 );
    // internal variables
//printf( "\n" );
    for ( i = 0; i < p->nInps; i++ )
    {
        int iParStart = p->nParsVIni + i * p->nParsVNum;
        for ( v = 0; v < p->nVars; v++ )
        {
            // add output literal
            pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, pValues[v]==0 );
            // add clause literals
            for ( f = 0; f < p->nParsVNum; f++ )
                pLits[f+1] = Abc_Var2Lit( iParStart + f, (v >> f) & 1 ); 
            if ( !Ifn_AddClause( pSat, pLits, pLits+p->nParsVNum+1 ) )
                return 0;
        }
    }
//printf( "\n" );
    for ( i = p->nInps; i < p->nObjs; i++ )
    {
        int nFans = p->Nodes[i].nFanins;
        int * pFans = p->Nodes[i].Fanins;
        if ( p->Nodes[i].Type == IFN_DSD_AND )
        {
            nLits = 0;
            pLits[nLits++] = Abc_Var2Lit( p->Nodes[i].Var, 0 );
            for ( f = 0; f < nFans; f++ )
            {
                pLits[nLits++] = Abc_Var2Lit( p->Nodes[pFans[f]].Var, 1 );
                // add small clause
                pLits2[0] = Abc_Var2Lit( p->Nodes[i].Var, 1 );
                pLits2[1] = Abc_Var2Lit( p->Nodes[pFans[f]].Var, 0 );
                if ( !Ifn_AddClause( pSat, pLits2, pLits2 + 2 ) )
                    return 0;
            }
            // add big clause
            if ( !Ifn_AddClause( pSat, pLits, pLits + nLits ) )
                return 0;
        }
        else if ( p->Nodes[i].Type == IFN_DSD_XOR )
        {
            int m, nMints = (1 << (nFans+1));
            for ( m = 0; m < nMints; m++ )
            {
                // skip even 
                int Count = 0;
                for ( v = 0; v <= nFans; v++ )
                    Count += ((m >> v) & 1);
                if ( (Count & 1) == 0 )
                    continue;
                // generate minterm
                pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, (m >> nFans) & 1 );
                for ( v = 0; v < nFans; v++ )
                    pLits[v+1] = Abc_Var2Lit( p->Nodes[pFans[v]].Var, (m >> v) & 1 );
                if ( !Ifn_AddClause( pSat, pLits, pLits + nFans + 1 ) )
                    return 0;
            }
        }
        else if ( p->Nodes[i].Type == IFN_DSD_MUX )
        {
            pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, 0 );
            pLits[1] = Abc_Var2Lit( p->Nodes[pFans[0]].Var, 1 ); // ctrl
            pLits[2] = Abc_Var2Lit( p->Nodes[pFans[1]].Var, 1 );
            if ( !Ifn_AddClause( pSat, pLits, pLits + 3 ) )
                return 0;
 
            pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, 1 );
            pLits[1] = Abc_Var2Lit( p->Nodes[pFans[0]].Var, 1 ); // ctrl
            pLits[2] = Abc_Var2Lit( p->Nodes[pFans[1]].Var, 0 );
            if ( !Ifn_AddClause( pSat, pLits, pLits + 3 ) )
                return 0;
 
            pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, 0 );
            pLits[1] = Abc_Var2Lit( p->Nodes[pFans[0]].Var, 0 ); // ctrl
            pLits[2] = Abc_Var2Lit( p->Nodes[pFans[2]].Var, 1 );
            if ( !Ifn_AddClause( pSat, pLits, pLits + 3 ) )
                return 0;
 
            pLits[0] = Abc_Var2Lit( p->Nodes[i].Var, 1 );
            pLits[1] = Abc_Var2Lit( p->Nodes[pFans[0]].Var, 0 ); // ctrl
            pLits[2] = Abc_Var2Lit( p->Nodes[pFans[2]].Var, 0 );
            if ( !Ifn_AddClause( pSat, pLits, pLits + 3 ) )
                return 0;
        }
        else if ( p->Nodes[i].Type == IFN_DSD_PRIME )
        {
            int nValues = (1 << nFans);
            int iParStart = p->Nodes[i].iFirst;
            for ( v = 0; v < nValues; v++ )
            {
                nLits = 0;
                if ( pValues[i] == -1 )
                {
                    pLits[nLits]  = Abc_Var2Lit( p->Nodes[i].Var, 0 );
                    pLits2[nLits] = Abc_Var2Lit( p->Nodes[i].Var, 1 );
                    nLits++;
                }
                for ( f = 0; f < nFans; f++, nLits++ )
                    pLits[nLits] = pLits2[nLits] = Abc_Var2Lit( p->Nodes[pFans[f]].Var, (v >> f) & 1 ); 
                pLits[nLits]  = Abc_Var2Lit( iParStart + v, 1 ); 
                pLits2[nLits] = Abc_Var2Lit( iParStart + v, 0 ); 
                nLits++;
                if ( pValues[i] != 0 )
                {
                    if ( !Ifn_AddClause( pSat, pLits2, pLits2 + nLits ) )
                        return 0;
                }
                if ( pValues[i] != 1 )
                {
                    if ( !Ifn_AddClause( pSat, pLits,  pLits + nLits ) )
                        return 0;
                }
            }
        }
        else assert( 0 );
//printf( "\n" );
    }
    // add last clause (not needed if the root node is IFN_DSD_PRIME)
    pLits[0] = Abc_Var2Lit( p->Nodes[p->nObjs-1].Var, pValues[p->nObjs-1]==0 );
    if ( !Ifn_AddClause( pSat, pLits,  pLits + 1 ) )
        return 0;
    return 1;
}

void Ifn_NtkMatchPrintStatus( sat_solver * p, int Iter, int status, int iMint, int Value, abctime clk )
{
    printf( "Iter = %5d  ",  Iter );
    printf( "Mint = %5d  ",  iMint );
    printf( "Value = %2d  ", Value );
    printf( "Var = %6d  ",   sat_solver_nvars(p) );
    printf( "Cla = %6d  ",   sat_solver_nclauses(p) );
    printf( "Conf = %6d  ",  sat_solver_nconflicts(p) );
    if ( status == l_False )
        printf( "status = unsat" );
    else if ( status == l_True )
        printf( "status = sat  " );
    else 
        printf( "status = undec" );
    Abc_PrintTime( 1, "Time", clk );
}
void Ifn_NtkMatchPrintConfig( Ifn_Ntk_t * p, sat_solver * pSat )
{
    int v, i;
    for ( v = p->nObjs; v < p->nPars; v++ )
    {
        for ( i = p->nInps; i < p->nObjs; i++ )
            if ( p->Nodes[i].Type == IFN_DSD_PRIME && (int)p->Nodes[i].iFirst == v )
                break;
        if ( i < p->nObjs )
            printf( " " );
        else if ( v >= p->nParsVIni && (v - p->nParsVIni) % p->nParsVNum == 0 )
            printf( " %d=", (v - p->nParsVIni) / p->nParsVNum );
        printf( "%d", sat_solver_var_value(pSat, v) );
    }
}
word Ifn_NtkMatchCollectPerm( Ifn_Ntk_t * p, sat_solver * pSat )
{
    word Perm = 0;
    int i, v, Mint;
    assert( p->nParsVNum <= 4 );
    for ( i = 0; i < p->nInps; i++ )
    {
        for ( Mint = v = 0; v < p->nParsVNum; v++ )
            if ( sat_solver_var_value(pSat, p->nParsVIni + i * p->nParsVNum + v) )
                Mint |= (1 << v);
        Abc_TtSetHex( &Perm, i, Mint );
    }
    return Perm;
}
void Ifn_NtkMatchCollectConfig( Ifn_Ntk_t * p, sat_solver * pSat, word * pConfig )
{
    int i, v, Mint;
    assert( p->nParsVNum <= 4 );
    for ( i = 0; i < p->nInps; i++ )
    {
        for ( Mint = v = 0; v < p->nParsVNum; v++ )
            if ( sat_solver_var_value(pSat, p->nParsVIni + i * p->nParsVNum + v) )
                Mint |= (1 << v);
        Abc_TtSetHex( pConfig, i, Mint );
    }
    for ( v = p->nObjs; v < p->nParsVIni; v++ )
        if ( sat_solver_var_value(pSat, v) )
            Abc_TtSetBit( pConfig + 1, v - p->nObjs );
}
void Ifn_NtkMatchPrintPerm( word Perm, int nInps )
{
    int i;
    assert( nInps <= 16 );
    for ( i = 0; i < nInps; i++ )
        printf( "%c", 'a' + Abc_TtGetHex(&Perm, i) );
    printf( "\n" );
}
int Ifn_NtkMatch( Ifn_Ntk_t * p, word * pTruth, int nVars, int nConfls, int fVerbose, int fVeryVerbose, word * pConfig )
{
    word * pTruth1;
    int RetValue = 0;
    int nIterMax = (1<<nVars);
    int i, v, status, iMint = 0;
    abctime clk = Abc_Clock();
//    abctime clkTru = 0, clkSat = 0, clk2;
    sat_solver * pSat;
    if ( nVars == 0 )
        return 1;
    pSat = sat_solver_new();
    Ifn_Prepare( p, pTruth, nVars );
    sat_solver_setnvars( pSat, p->nPars );
    Ifn_NtkAddConstraints( p, pSat );
    if ( fVeryVerbose )
        Ifn_NtkMatchPrintStatus( pSat, 0, l_True, -1, -1, Abc_Clock() - clk );
    if ( pConfig ) assert( *pConfig == 0 );
    for ( i = 0; i < nIterMax; i++ )
    {
        // get variable assignment
        for ( v = 0; v < p->nObjs; v++ )
            p->Values[v] = v < p->nVars ? (iMint >> v) & 1 :  -1;
        p->Values[p->nObjs-1] = Abc_TtGetBit( pTruth, iMint );
        // derive clauses
        if ( !Ifn_NtkAddClauses( p, p->Values, pSat ) )
            break;
        // find assignment of parameters
//        clk2 = Abc_Clock();
        status = sat_solver_solve( pSat, NULL, NULL, nConfls, 0, 0, 0 );
//        clkSat += Abc_Clock() - clk2;
        if ( fVeryVerbose )
            Ifn_NtkMatchPrintStatus( pSat, i+1, status, iMint, p->Values[p->nObjs-1], Abc_Clock() - clk );
        if ( status != l_True )
            break;
        // collect assignment
        for ( v = p->nObjs; v < p->nPars; v++ )
            p->Values[v] = sat_solver_var_value(pSat, v);
        // find truth table
//        clk2 = Abc_Clock();
        pTruth1 = Ifn_NtkDeriveTruth( p, p->Values );
//        clkTru += Abc_Clock() - clk2;
        Abc_TtXor( pTruth1, pTruth1, p->pTruth, p->nWords, 0 );
        // find mismatch if present
        iMint = Abc_TtFindFirstBit( pTruth1, p->nVars );
        if ( iMint == -1 )
        {
            if ( pConfig ) 
                Ifn_NtkMatchCollectConfig( p, pSat, pConfig );
/*
            if ( pPerm )
            {
                int RetValue = Ifn_ManSatFindCofigBitsTest( p, pTruth, nVars, *pPerm );
                Ifn_NtkMatchPrintPerm( *pPerm, p->nInps );
                if ( RetValue == 0 )
                    printf( "Verification failed.\n" );
            }
*/
            RetValue = 1;
            break;
        }
    }
    assert( i < nIterMax );
    if ( fVerbose )
    {
        printf( "%s  Iter =%4d. Confl = %6d.  ", RetValue ? "yes":"no ", i, sat_solver_nconflicts(pSat) );
        if ( RetValue )
            Ifn_NtkMatchPrintConfig( p, pSat );
        printf( "\n" );
    }
    sat_solver_delete( pSat );
//    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
//    Abc_PrintTime( 1, "Sat", clkSat );
//    Abc_PrintTime( 1, "Tru", clkTru );
    return RetValue;
}

void Ifn_NtkRead()
{
    int RetValue;
    int nVars = 8;
//    word * pTruth = Dau_DsdToTruth( "(abcdefghi)", nVars );
    word * pTruth = Dau_DsdToTruth( "1008{(1008{(ab)cde}f)ghi}", nVars );
//    word * pTruth = Dau_DsdToTruth( "18{(1008{(ab)cde}f)gh}", nVars );
//    word * pTruth = Dau_DsdToTruth( "1008{(1008{[ab]cde}f)ghi}", nVars );
//    word * pTruth = Dau_DsdToTruth( "(abcd)", nVars );
//    word * pTruth = Dau_DsdToTruth( "(abc)", nVars );
//    word * pTruth = Dau_DsdToTruth( "18{(1008{(ab)cde}f)gh}", nVars );
//    char * pStr = "e={abc};f={ed};";
//    char * pStr = "d={ab};e={cd};";
//    char * pStr = "j=(ab);k={jcde};l=(kf);m={lghi};";
//    char * pStr = "i={abc};j={ide};k={ifg};l={jkh};";
//    char * pStr = "h={abcde};i={abcdf};j=<ghi>;";
//    char * pStr = "g=<abc>;h=<ade>;i={fgh};";
//    char * pStr = "i=<abc>;j=(def);k=[gh];l={ijk};";
    char * pStr = "{({(ab)cde}f)ghi};AB;CD;DE;GH;HI";
    Ifn_Ntk_t * p = Ifn_NtkParse( pStr );
    word Perm = 0;
    if ( p == NULL )
        return;
    Ifn_NtkPrint( p );
    Dau_DsdPrintFromTruth( pTruth, nVars );
    // get the given function
    RetValue = Ifn_NtkMatch( p, pTruth, nVars, 0, 1, 1, &Perm );
    ABC_FREE( p );
}

 
 
ABC_NAMESPACE_IMPL_END