Fixing mismatch in exact NPN computation (by XueGong Zhou)

3 files changed, 751 insertions, 738 deletions

diff --git a/src/opt/dau/dau.h b/src/opt/dau/dau.h
index df8c8f40..82e9b83b 100644
--- a/src/opt/dau/dau.h
+++ b/src/opt/dau/dau.h
@@ -60,6 +60,7 @@ typedef enum {
 
 typedef struct Dss_Man_t_ Dss_Man_t;
 typedef struct Abc_TtHieMan_t_ Abc_TtHieMan_t;
+typedef unsigned(*TtCanonicizeFunc)(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag);
 
 ////////////////////////////////////////////////////////////////////////
 ///                      MACRO DEFINITIONS                           ///
@@ -83,6 +84,9 @@ extern int           Abc_TtCountOnesInCofsSimple( word * pTruth, int nVars, int
 extern unsigned      Abc_TtCanonicizeHie(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int fExact );
 extern Abc_TtHieMan_t * Abc_TtHieManStart( int nVars, int nLevels );
 extern void          Abc_TtHieManStop(Abc_TtHieMan_t * p );
+extern unsigned      Abc_TtCanonicizeWrap(TtCanonicizeFunc func, Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag);
+extern unsigned      Abc_TtCanonicizeAda(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int iThres);
+extern unsigned      Abc_TtCanonicizeHie(Abc_TtHieMan_t * p, word * pTruthInit, int nVars, char * pCanonPerm, int fExact);
 /*=== dauCount.c ==========================================================*/
 extern int           Abc_TtCountOnesInCofsQuick( word * pTruth, int nVars, int * pStore );
 /*=== dauDsd.c  ==========================================================*/
diff --git a/src/opt/dau/dauCanon.c b/src/opt/dau/dauCanon.c
index 0c93cc85..ae9b7761 100644
--- a/src/opt/dau/dauCanon.c
+++ b/src/opt/dau/dauCanon.c
@@ -64,11 +64,11 @@ static inline int Abc_TtCompare1VarCofs( word * pTruth, int nWords, int iVar )
             return Cof0 < Cof1 ? -1 : 1;
         return 0;
     }
-	if ( iVar <= 5 )
-	{
+    if ( iVar <= 5 )
+    {
         word Cof0, Cof1;
-		int w, shift = (1 << iVar);
-		for ( w = 0; w < nWords; w++ )
+        int w, shift = (1 << iVar);
+        for ( w = 0; w < nWords; w++ )
         {
             Cof0 = pTruth[w] & s_Truths6Neg[iVar];
             Cof1 = (pTruth[w] >> shift) & s_Truths6Neg[iVar];
@@ -76,18 +76,18 @@ static inline int Abc_TtCompare1VarCofs( word * pTruth, int nWords, int iVar )
                 return Cof0 < Cof1 ? -1 : 1;
         }
         return 0;
-	}
-	// if ( iVar > 5 )
-	{
+    }
+    // if ( iVar > 5 )
+    {
         word * pLimit = pTruth + nWords;
-		int i, iStep = Abc_TtWordNum(iVar);
+        int i, iStep = Abc_TtWordNum(iVar);
         assert( nWords >= 2 );
-		for ( ; pTruth < pLimit; pTruth += 2*iStep )
-			for ( i = 0; i < iStep; i++ )
+        for ( ; pTruth < pLimit; pTruth += 2*iStep )
+            for ( i = 0; i < iStep; i++ )
                 if ( pTruth[i] != pTruth[i + iStep] )
                     return pTruth[i] < pTruth[i + iStep] ? -1 : 1;
         return 0;
-	}	
+    }   
 }
 static inline int Abc_TtCompare1VarCofsRev( word * pTruth, int nWords, int iVar )
 {
@@ -99,11 +99,11 @@ static inline int Abc_TtCompare1VarCofsRev( word * pTruth, int nWords, int iVar
             return Cof0 < Cof1 ? -1 : 1;
         return 0;
     }
-	if ( iVar <= 5 )
-	{
+    if ( iVar <= 5 )
+    {
         word Cof0, Cof1;
-		int w, shift = (1 << iVar);
-		for ( w = nWords - 1; w >= 0; w-- )
+        int w, shift = (1 << iVar);
+        for ( w = nWords - 1; w >= 0; w-- )
         {
             Cof0 = pTruth[w] & s_Truths6Neg[iVar];
             Cof1 = (pTruth[w] >> shift) & s_Truths6Neg[iVar];
@@ -111,18 +111,18 @@ static inline int Abc_TtCompare1VarCofsRev( word * pTruth, int nWords, int iVar
                 return Cof0 < Cof1 ? -1 : 1;
         }
         return 0;
-	}
-	// if ( iVar > 5 )
-	{
+    }
+    // if ( iVar > 5 )
+    {
         word * pLimit = pTruth + nWords;
-		int i, iStep = Abc_TtWordNum(iVar);
+        int i, iStep = Abc_TtWordNum(iVar);
         assert( nWords >= 2 );
-		for ( pLimit -= 2*iStep; pLimit >= pTruth; pLimit -= 2*iStep )
-			for ( i = iStep - 1; i >= 0; i-- )
+        for ( pLimit -= 2*iStep; pLimit >= pTruth; pLimit -= 2*iStep )
+            for ( i = iStep - 1; i >= 0; i-- )
                 if ( pLimit[i] != pLimit[i + iStep] )
                     return pLimit[i] < pLimit[i + iStep] ? -1 : 1;
         return 0;
-	}	
+    }   
 }
 */
 
@@ -142,35 +142,35 @@ static inline int Abc_TtCheckEqual2VarCofs( word * pTruth, int nWords, int iVar,
     assert( Num1 < Num2 && Num2 < 4 );
     if ( nWords == 1 )
         return ((pTruth[0] >> (Num2 * (1 << iVar))) & s_CMasks6[iVar]) == ((pTruth[0] >> (Num1 * (1 << iVar))) & s_CMasks6[iVar]);
-	if ( iVar <= 4 )
-	{
-		int w, shift = (1 << iVar);
-		for ( w = 0; w < nWords; w++ )
+    if ( iVar <= 4 )
+    {
+        int w, shift = (1 << iVar);
+        for ( w = 0; w < nWords; w++ )
             if ( ((pTruth[w] >> Num2 * shift) & s_CMasks6[iVar]) != ((pTruth[w] >> Num1 * shift) & s_CMasks6[iVar]) )
                 return 0;
         return 1;
-	}
-	if ( iVar == 5 )
-	{
+    }
+    if ( iVar == 5 )
+    {
         unsigned * pTruthU = (unsigned *)pTruth;
         unsigned * pLimitU = (unsigned *)(pTruth + nWords);
         assert( nWords >= 2 );
-		for ( ; pTruthU < pLimitU; pTruthU += 4 )
+        for ( ; pTruthU < pLimitU; pTruthU += 4 )
             if ( pTruthU[Num2] != pTruthU[Num1] )
                 return 0;
         return 1;
-	}
-	// if ( iVar > 5 )
-	{
+    }
+    // if ( iVar > 5 )
+    {
         word * pLimit = pTruth + nWords;
-		int i, iStep = Abc_TtWordNum(iVar);
+        int i, iStep = Abc_TtWordNum(iVar);
         assert( nWords >= 4 );
-		for ( ; pTruth < pLimit; pTruth += 4*iStep )
-			for ( i = 0; i < iStep; i++ )
+        for ( ; pTruth < pLimit; pTruth += 4*iStep )
+            for ( i = 0; i < iStep; i++ )
                 if ( pTruth[i+Num2*iStep] != pTruth[i+Num1*iStep] )
                     return 0;
         return 1;
-	}	
+    }   
 }
 
 /**Function*************************************************************
@@ -195,11 +195,11 @@ static inline int Abc_TtCompare2VarCofs( word * pTruth, int nWords, int iVar, in
             return Cof1 < Cof2 ? -1 : 1;
         return 0;
     }
-	if ( iVar <= 4 )
-	{
+    if ( iVar <= 4 )
+    {
         word Cof1, Cof2;
-		int w, shift = (1 << iVar);
-		for ( w = 0; w < nWords; w++ )
+        int w, shift = (1 << iVar);
+        for ( w = 0; w < nWords; w++ )
         {
             Cof1 = (pTruth[w] >> Num1 * shift) & s_CMasks6[iVar];
             Cof2 = (pTruth[w] >> Num2 * shift) & s_CMasks6[iVar];
@@ -207,30 +207,30 @@ static inline int Abc_TtCompare2VarCofs( word * pTruth, int nWords, int iVar, in
                 return Cof1 < Cof2 ? -1 : 1;
         }
         return 0;
-	}
-	if ( iVar == 5 )
-	{
+    }
+    if ( iVar == 5 )
+    {
         unsigned * pTruthU = (unsigned *)pTruth;
         unsigned * pLimitU = (unsigned *)(pTruth + nWords);
         assert( nWords >= 2 );
-		for ( ; pTruthU < pLimitU; pTruthU += 4 )
+        for ( ; pTruthU < pLimitU; pTruthU += 4 )
             if ( pTruthU[Num1] != pTruthU[Num2] )
                 return pTruthU[Num1] < pTruthU[Num2] ? -1 : 1;
         return 0;
-	}
-	// if ( iVar > 5 )
-	{
+    }
+    // if ( iVar > 5 )
+    {
         word * pLimit = pTruth + nWords;
-		int i, iStep = Abc_TtWordNum(iVar);
+        int i, iStep = Abc_TtWordNum(iVar);
         int Offset1 = Num1*iStep;
         int Offset2 = Num2*iStep;
         assert( nWords >= 4 );
-		for ( ; pTruth < pLimit; pTruth += 4*iStep )
-			for ( i = 0; i < iStep; i++ )
+        for ( ; pTruth < pLimit; pTruth += 4*iStep )
+            for ( i = 0; i < iStep; i++ )
                 if ( pTruth[i + Offset1] != pTruth[i + Offset2] )
                     return pTruth[i + Offset1] < pTruth[i + Offset2] ? -1 : 1;
         return 0;
-	}	
+    }   
 }
 static inline int Abc_TtCompare2VarCofsRev( word * pTruth, int nWords, int iVar, int Num1, int Num2 )
 {
@@ -243,11 +243,11 @@ static inline int Abc_TtCompare2VarCofsRev( word * pTruth, int nWords, int iVar,
             return Cof1 < Cof2 ? -1 : 1;
         return 0;
     }
-	if ( iVar <= 4 )
-	{
+    if ( iVar <= 4 )
+    {
         word Cof1, Cof2;
-		int w, shift = (1 << iVar);
-		for ( w = nWords - 1; w >= 0; w-- )
+        int w, shift = (1 << iVar);
+        for ( w = nWords - 1; w >= 0; w-- )
         {
             Cof1 = (pTruth[w] >> Num1 * shift) & s_CMasks6[iVar];
             Cof2 = (pTruth[w] >> Num2 * shift) & s_CMasks6[iVar];
@@ -255,30 +255,30 @@ static inline int Abc_TtCompare2VarCofsRev( word * pTruth, int nWords, int iVar,
                 return Cof1 < Cof2 ? -1 : 1;
         }
         return 0;
-	}
-	if ( iVar == 5 )
-	{
+    }
+    if ( iVar == 5 )
+    {
         unsigned * pTruthU = (unsigned *)pTruth;
         unsigned * pLimitU = (unsigned *)(pTruth + nWords);
         assert( nWords >= 2 );
-		for ( pLimitU -= 4; pLimitU >= pTruthU; pLimitU -= 4 )
+        for ( pLimitU -= 4; pLimitU >= pTruthU; pLimitU -= 4 )
             if ( pLimitU[Num1] != pLimitU[Num2] )
                 return pLimitU[Num1] < pLimitU[Num2] ? -1 : 1;
         return 0;
-	}
-	// if ( iVar > 5 )
-	{
+    }
+    // if ( iVar > 5 )
+    {
         word * pLimit = pTruth + nWords;
-		int i, iStep = Abc_TtWordNum(iVar);
+        int i, iStep = Abc_TtWordNum(iVar);
         int Offset1 = Num1*iStep;
         int Offset2 = Num2*iStep;
         assert( nWords >= 4 );
-		for ( pLimit -= 4*iStep; pLimit >= pTruth; pLimit -= 4*iStep )
-			for ( i = iStep - 1; i >= 0; i-- )
+        for ( pLimit -= 4*iStep; pLimit >= pTruth; pLimit -= 4*iStep )
+            for ( i = iStep - 1; i >= 0; i-- )
                 if ( pLimit[i + Offset1] != pLimit[i + Offset2] )
                     return pLimit[i + Offset1] < pLimit[i + Offset2] ? -1 : 1;
         return 0;
-	}	
+    }   
 }
 
 /**Function*************************************************************
@@ -292,13 +292,24 @@ static inline int Abc_TtCompare2VarCofsRev( word * pTruth, int nWords, int iVar,
   SeeAlso     []
 
 ***********************************************************************/
-#define DO_SMALL_TRUTHTABLE 0
+void Abc_TtNormalizeSmallTruth(word * pTruth, int nVars)
+{
+    if (nVars < 6) {
+        int shift, bits = (1 << nVars);
+        word base = *pTruth = *pTruth & ((((word)1) << bits) - 1);
+        for (shift = bits; shift < 64; shift += bits)
+            *pTruth |= base << shift;
+    }
+}
 
-static inline void Abc_TtNormalizeSmallTruth(word * pTruth, int nVars)
+inline void Abc_TtVerifySmallTruth(word * pTruth, int nVars)
 {
-#if DO_SMALL_TRUTHTABLE
-	if (nVars < 6)
-		*pTruth &= (1ULL << (1 << nVars)) - 1;
+#ifndef NDEBUG
+    if (nVars < 6) {
+        word nTruth = *pTruth;
+        Abc_TtNormalizeSmallTruth(&nTruth, nVars);
+        assert(*pTruth == nTruth);
+    }
 #endif
 }
 
@@ -306,7 +317,7 @@ static inline int Abc_TtCountOnesInTruth( word * pTruth, int nVars )
 {   
     int nWords = Abc_TtWordNum( nVars );
     int k, Counter = 0;
-    Abc_TtNormalizeSmallTruth(pTruth, nVars);
+    Abc_TtVerifySmallTruth(pTruth, nVars);
     for ( k = 0; k < nWords; k++ )
         if ( pTruth[k] )
             Counter += Abc_TtCountOnes( pTruth[k] );
@@ -318,7 +329,7 @@ static inline void Abc_TtCountOnesInCofs( word * pTruth, int nVars, int * pStore
     int i, k, Counter, nWords;
     if ( nVars <= 6 )
     {
-        Abc_TtNormalizeSmallTruth(pTruth, nVars);
+        Abc_TtVerifySmallTruth(pTruth, nVars);
         for ( i = 0; i < nVars; i++ )
             pStore[i] = Abc_TtCountOnes( pTruth[0] & s_Truths6Neg[i] );
         return;
@@ -1154,77 +1165,79 @@ unsigned Abc_TtCanonicizePhase( word * pTruth, int nVars )
 
 struct Abc_TtHieMan_t_
 {
-	int  nLastLevel, nWords;
-	Vec_Mem_t *  vTtMem[TT_MAX_LEVELS];    // truth table memory and hash tables
-	Vec_Int_t *  vRepres[TT_MAX_LEVELS];   // pointers to the representatives from the last hierarchical level
-	int         vTruthId[TT_MAX_LEVELS];
+    int  nLastLevel, nWords;
+    Vec_Mem_t *  vTtMem[TT_MAX_LEVELS];    // truth table memory and hash tables
+    Vec_Int_t *  vRepres[TT_MAX_LEVELS];   // pointers to the representatives from the last hierarchical level
+    int         vTruthId[TT_MAX_LEVELS];
 };
 
 Abc_TtHieMan_t * Abc_TtHieManStart(int nVars, int nLevels)
 {
-	Abc_TtHieMan_t * p = NULL;
-	int i;
-	if (nLevels > TT_MAX_LEVELS) return p;
-	p = ABC_CALLOC(Abc_TtHieMan_t, 1);
-	p->nLastLevel = nLevels - 1;
-	p->nWords = Abc_TtWordNum(nVars);
-	for (i = 0; i < nLevels; i++)
-	{
-		p->vTtMem[i] = Vec_MemAlloc(p->nWords, 12);
-		Vec_MemHashAlloc(p->vTtMem[i], 10000);
-		p->vRepres[i] = Vec_IntAlloc(1);
-	}
-	return p;
+    Abc_TtHieMan_t * p = NULL;
+    int i;
+    if (nLevels > TT_MAX_LEVELS) return p;
+    p = ABC_CALLOC(Abc_TtHieMan_t, 1);
+    p->nLastLevel = nLevels - 1;
+    p->nWords = Abc_TtWordNum(nVars);
+    for (i = 0; i < nLevels; i++)
+    {
+        p->vTtMem[i] = Vec_MemAlloc(p->nWords, 12);
+        Vec_MemHashAlloc(p->vTtMem[i], 10000);
+        p->vRepres[i] = Vec_IntAlloc(1);
+    }
+    return p;
 }
 
 void Abc_TtHieManStop(Abc_TtHieMan_t * p)
 {
-	int i;
-	for (i = 0; i <= p->nLastLevel; i++)
-	{
-		Vec_MemHashFree(p->vTtMem[i]);
-		Vec_MemFreeP(&p->vTtMem[i]);
-		Vec_IntFree(p->vRepres[i]);
-	}
-	ABC_FREE(p);
+    int i;
+    for (i = 0; i <= p->nLastLevel; i++)
+    {
+        Vec_MemHashFree(p->vTtMem[i]);
+        Vec_MemFreeP(&p->vTtMem[i]);
+        Vec_IntFree(p->vRepres[i]);
+    }
+    ABC_FREE(p);
 }
 
 int Abc_TtHieRetrieveOrInsert(Abc_TtHieMan_t * p, int level, word * pTruth, word * pResult)
 {
-	int i, iSpot, truthId;
-	word * pRepTruth;
-	if (level < 0) level += p->nLastLevel + 1;
-	if (level < 0 || level > p->nLastLevel) return -1;
-	iSpot = *Vec_MemHashLookup(p->vTtMem[level], pTruth);
-	if (iSpot == -1) {
-		p->vTruthId[level] = Vec_MemHashInsert(p->vTtMem[level], pTruth);
-		if (level < p->nLastLevel) return 0;
-		iSpot = p->vTruthId[level];
-	}
-	// return the class representative
-	if (level < p->nLastLevel)
-		truthId = Vec_IntEntry(p->vRepres[level], iSpot);
-	else
-		truthId = iSpot;
-	for (i = 0; i < level; i++)
-		Vec_IntSetEntry(p->vRepres[i], p->vTruthId[i], truthId);
-
-	pRepTruth = Vec_MemReadEntry(p->vTtMem[p->nLastLevel], truthId);
-	if (level < p->nLastLevel) {
-		Abc_TtCopy(pResult, pRepTruth, p->nWords, 0);
-		return 1;
-	}
-	assert(Abc_TtEqual(pTruth, pRepTruth, p->nWords));
-	if (pTruth != pResult)
-		Abc_TtCopy(pResult, pRepTruth, p->nWords, 0);
-	return 0;
+    int i, iSpot, truthId;
+    word * pRepTruth;
+    if (!p) return -1;
+    if (level < 0) level += p->nLastLevel + 1;
+    if (level < 0 || level > p->nLastLevel) return -1;
+    iSpot = *Vec_MemHashLookup(p->vTtMem[level], pTruth);
+    if (iSpot == -1) {
+        p->vTruthId[level] = Vec_MemHashInsert(p->vTtMem[level], pTruth);
+        if (level < p->nLastLevel) return 0;
+        iSpot = p->vTruthId[level];
+    }
+    // return the class representative
+    if (level < p->nLastLevel)
+        truthId = Vec_IntEntry(p->vRepres[level], iSpot);
+    else
+        truthId = iSpot;
+    for (i = 0; i < level; i++)
+        Vec_IntSetEntry(p->vRepres[i], p->vTruthId[i], truthId);
+
+    pRepTruth = Vec_MemReadEntry(p->vTtMem[p->nLastLevel], truthId);
+    if (level < p->nLastLevel) {
+        Abc_TtCopy(pResult, pRepTruth, p->nWords, 0);
+        return 1;
+    }
+    assert(Abc_TtEqual(pTruth, pRepTruth, p->nWords));
+    if (pTruth != pResult)
+        Abc_TtCopy(pResult, pRepTruth, p->nWords, 0);
+    return 0;
 }
 
 unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars, char * pCanonPerm, int fExact )
 {
     int fNaive = 1;
     int pStore[17];
-    static word pTruth[1024];
+    //static word pTruth[1024];
+    word * pTruth = pTruthInit;
     unsigned uCanonPhase = 0;
     int nOnes, nWords = Abc_TtWordNum( nVars );
     int i, k;
@@ -1237,7 +1250,7 @@ unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars,
         return 0;
     }
 
-    Abc_TtCopy( pTruth, pTruthInit, nWords, 0 );
+    //Abc_TtCopy( pTruth, pTruthInit, nWords, 0 );
 
     for ( i = 0; i < nVars; i++ )
         pCanonPerm[i] = i;
@@ -1265,7 +1278,7 @@ unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars,
         pStore[i] = nOnes - pStore[i]; 
     }
     // check cache
-	if (Abc_TtHieRetrieveOrInsert(p, 1, pTruth, pTruthInit) > 0) return 0;
+    if (Abc_TtHieRetrieveOrInsert(p, 1, pTruth, pTruthInit) > 0) return 0;
 
     // normalize permutation
     {
@@ -1289,7 +1302,7 @@ unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars,
         }
     }
     // check cache
-	if (Abc_TtHieRetrieveOrInsert(p, 2, pTruth, pTruthInit) > 0) return 0;
+    if (Abc_TtHieRetrieveOrInsert(p, 2, pTruth, pTruthInit) > 0) return 0;
 
     // iterate TT permutations for tied variables
     for ( k = 0; k < 5; k++ )
@@ -1308,7 +1321,7 @@ unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars,
             break;
     }
     // check cache
-	if (Abc_TtHieRetrieveOrInsert(p, 3, pTruth, pTruthInit) > 0) return 0;
+    if (Abc_TtHieRetrieveOrInsert(p, 3, pTruth, pTruthInit) > 0) return 0;
 
     // perform exact NPN using groups
     if ( fExact ) {
@@ -1350,7 +1363,7 @@ unsigned Abc_TtCanonicizeHie( Abc_TtHieMan_t * p, word * pTruthInit, int nVars,
         }
     }
     // update cache
-	Abc_TtHieRetrieveOrInsert(p, 4, pTruth, pTruthInit);
+    Abc_TtHieRetrieveOrInsert(p, 4, pTruth, pTruthInit);
     return 0;
 }
 
@@ -1369,26 +1382,26 @@ SeeAlso     []
 
 typedef struct TiedGroup_
 {
-	char iStart;                         // index of Abc_TgMan_t::pPerm
-	char nGVars;                         // the number of variables in the group
-	char fPhased;                        // if the phases of the variables are determined
+    char iStart;                         // index of Abc_TgMan_t::pPerm
+    char nGVars;                         // the number of variables in the group
+    char fPhased;                        // if the phases of the variables are determined
 } TiedGroup;
 
 typedef struct Abc_TgMan_t_
 {
-	word *pTruth;
-	int nVars;                          // the number of variables
-	int nGVars;                         // the number of variables in groups ( symmetric variables purged )
-	int nGroups;                        // the number of tied groups
-	unsigned uPhase;                    // phase of each variable and the function
-	char pPerm[16];                     // permutation of variables, symmetric variables purged, for grouping
-	char pPermT[16];                    // permutation of variables, symmetric variables expanded, actual transformation for pTruth
-	char pPermTRev[16];                 // reverse permutation of pPermT
-	signed char pPermDir[16];			// for generating the next permutation
-	TiedGroup pGroup[16];               // tied groups
-	// symemtric group attributes
-	char symPhase[16];                  // phase type of symemtric groups
-	signed char symLink[17];            // singly linked list, indicate the variables in symemtric groups
+    word *pTruth;
+    int nVars;                          // the number of variables
+    int nGVars;                         // the number of variables in groups ( symmetric variables purged )
+    int nGroups;                        // the number of tied groups
+    unsigned uPhase;                    // phase of each variable and the function
+    char pPerm[16];                     // permutation of variables, symmetric variables purged, for grouping
+    char pPermT[16];                    // permutation of variables, symmetric variables expanded, actual transformation for pTruth
+    char pPermTRev[16];                 // reverse permutation of pPermT
+    signed char pPermDir[16];           // for generating the next permutation
+    TiedGroup pGroup[16];               // tied groups
+    // symemtric group attributes
+    char symPhase[16];                  // phase type of symemtric groups
+    signed char symLink[17];            // singly linked list, indicate the variables in symemtric groups
 } Abc_TgMan_t;
 
 #if !defined(NDEBUG) && !defined(CANON_VERIFY)
@@ -1409,59 +1422,59 @@ SeeAlso     []
 // Johnson¨CTrotter algorithm
 static int Abc_NextPermSwapC(char * pData, signed char * pDir, int size)
 {
-	int i, j, k = -1;
-	for (i = 0; i < size; i++)
-	{
-		j = i + pDir[i];
-		if (j >= 0 && j < size && pData[i] > pData[j] && (k < 0 || pData[i] > pData[k]))
-			k = i;
-	}
-	if (k < 0) k = 0;
-
-	for (i = 0; i < size; i++)
-		if (pData[i] > pData[k])
-			pDir[i] = -pDir[i];
-
-	j = k + pDir[k];
-	return j < k ? j : k;
+    int i, j, k = -1;
+    for (i = 0; i < size; i++)
+    {
+        j = i + pDir[i];
+        if (j >= 0 && j < size && pData[i] > pData[j] && (k < 0 || pData[i] > pData[k]))
+            k = i;
+    }
+    if (k < 0) k = 0;
+
+    for (i = 0; i < size; i++)
+        if (pData[i] > pData[k])
+            pDir[i] = -pDir[i];
+
+    j = k + pDir[k];
+    return j < k ? j : k;
 }
 
 
 typedef unsigned(*TtCanonicizeFunc)(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag);
 unsigned Abc_TtCanonicizeWrap(TtCanonicizeFunc func, Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag)
 {
-	int nWords = Abc_TtWordNum(nVars);
-	unsigned uCanonPhase1, uCanonPhase2;
-	char pCanonPerm2[16];
-	static word pTruth2[1024];
-
-	if (Abc_TtCountOnesInTruth(pTruth, nVars) != (1 << (nVars - 1)))
-		return func(p, pTruth, nVars, pCanonPerm, flag);
-	Abc_TtCopy(pTruth2, pTruth, nWords, 1);
-	Abc_TtNormalizeSmallTruth(pTruth2, nVars);
-	uCanonPhase1 = func(p, pTruth, nVars, pCanonPerm, flag);
-	uCanonPhase2 = func(p, pTruth2, nVars, pCanonPerm2, flag);
-	if (Abc_TtCompareRev(pTruth, pTruth2, nWords) <= 0)
-		return uCanonPhase1;
-	Abc_TtCopy(pTruth, pTruth2, nWords, 0);
-	memcpy(pCanonPerm, pCanonPerm2, nVars);
-	return uCanonPhase2;
+    int nWords = Abc_TtWordNum(nVars);
+    unsigned uCanonPhase1, uCanonPhase2;
+    char pCanonPerm2[16];
+    static word pTruth2[1024];
+
+    Abc_TtNormalizeSmallTruth(pTruth, nVars);
+    if (Abc_TtCountOnesInTruth(pTruth, nVars) != nWords * 32)
+        return func(p, pTruth, nVars, pCanonPerm, flag);
+    Abc_TtCopy(pTruth2, pTruth, nWords, 1);
+    uCanonPhase1 = func(p, pTruth, nVars, pCanonPerm, flag);
+    uCanonPhase2 = func(p, pTruth2, nVars, pCanonPerm2, flag);
+    if (Abc_TtCompareRev(pTruth, pTruth2, nWords) <= 0)
+        return uCanonPhase1;
+    Abc_TtCopy(pTruth, pTruth2, nWords, 0);
+    memcpy(pCanonPerm, pCanonPerm2, nVars);
+    return uCanonPhase2;
 }
 
 word gpVerCopy[1024];
 static int Abc_TtCannonVerify(word* pTruth, int nVars, char * pCanonPerm, unsigned uCanonPhase)
 {
 #ifdef CANON_VERIFY
-	int nWords = Abc_TtWordNum(nVars);
-	char pCanonPermCopy[16];
-	static word pCopy2[1024];
-	Abc_TtCopy(pCopy2, pTruth, nWords, 0);
-	memcpy(pCanonPermCopy, pCanonPerm, sizeof(char) * nVars);
-	Abc_TtImplementNpnConfig(pCopy2, nVars, pCanonPermCopy, uCanonPhase);
-	Abc_TtNormalizeSmallTruth(pCopy2, nVars);
-	return Abc_TtEqual(gpVerCopy, pCopy2, nWords);
+    int nWords = Abc_TtWordNum(nVars);
+    char pCanonPermCopy[16];
+    static word pCopy2[1024];
+    Abc_TtVerifySmallTruth(pTruth, nVars);
+    Abc_TtCopy(pCopy2, pTruth, nWords, 0);
+    memcpy(pCanonPermCopy, pCanonPerm, sizeof(char) * nVars);
+    Abc_TtImplementNpnConfig(pCopy2, nVars, pCanonPermCopy, uCanonPhase);
+    return Abc_TtEqual(gpVerCopy, pCopy2, nWords);
 #else
-	return 1;
+    return 1;
 #endif
 }
 
@@ -1479,44 +1492,44 @@ SeeAlso     []
 
 static void Abc_TginitMan(Abc_TgMan_t * pMan, word * pTruth, int nVars)
 {
-	int i;
-	pMan->pTruth = pTruth;
-	pMan->nVars = pMan->nGVars = nVars;
-	pMan->uPhase = 0;
-	for (i = 0; i < nVars; i++)
-	{
-		pMan->pPerm[i] = i;
-		pMan->pPermT[i] = i;
-		pMan->pPermTRev[i] = i;
-		pMan->symPhase[i] = 1;
-	}
+    int i;
+    pMan->pTruth = pTruth;
+    pMan->nVars = pMan->nGVars = nVars;
+    pMan->uPhase = 0;
+    for (i = 0; i < nVars; i++)
+    {
+        pMan->pPerm[i] = i;
+        pMan->pPermT[i] = i;
+        pMan->pPermTRev[i] = i;
+        pMan->symPhase[i] = 1;
+    }
 }
 
 static inline void Abc_TgManCopy(Abc_TgMan_t* pDst, word* pDstTruth, Abc_TgMan_t* pSrc)
 {
-	*pDst = *pSrc;
-	Abc_TtCopy(pDstTruth, pSrc->pTruth, Abc_TtWordNum(pSrc->nVars), 0);
-	pDst->pTruth = pDstTruth;
+    *pDst = *pSrc;
+    Abc_TtCopy(pDstTruth, pSrc->pTruth, Abc_TtWordNum(pSrc->nVars), 0);
+    pDst->pTruth = pDstTruth;
 }
 
 static inline int Abc_TgCannonVerify(Abc_TgMan_t* pMan)
 {
-	return Abc_TtCannonVerify(pMan->pTruth, pMan->nVars, pMan->pPermT, pMan->uPhase);
+    return Abc_TtCannonVerify(pMan->pTruth, pMan->nVars, pMan->pPermT, pMan->uPhase);
 }
 
 void Abc_TgExpendSymmetry(Abc_TgMan_t * pMan, char * pPerm, char * pDest);
 static void CheckConfig(Abc_TgMan_t * pMan)
 {
 #ifndef NDEBUG
-	int i;
-	char pPermE[16];
-	Abc_TgExpendSymmetry(pMan, pMan->pPerm, pPermE);
-	for (i = 0; i < pMan->nVars; i++)
-	{
-		assert(pPermE[i] == pMan->pPermT[i]);
-		assert(pMan->pPermTRev[(int)pMan->pPermT[i]] == i);
-	}
-	assert(Abc_TgCannonVerify(pMan));
+    int i;
+    char pPermE[16];
+    Abc_TgExpendSymmetry(pMan, pMan->pPerm, pPermE);
+    for (i = 0; i < pMan->nVars; i++)
+    {
+        assert(pPermE[i] == pMan->pPermT[i]);
+        assert(pMan->pPermTRev[(int)pMan->pPermT[i]] == i);
+    }
+    assert(Abc_TgCannonVerify(pMan));
 #endif
 }
 
@@ -1534,84 +1547,84 @@ SeeAlso     []
 
 static inline void Abc_TgFlipVar(Abc_TgMan_t* pMan, int iVar)
 {
-	int nWords = Abc_TtWordNum(pMan->nVars);
-	int ivp = pMan->pPermTRev[iVar];
-	Abc_TtFlip(pMan->pTruth, nWords, ivp);
-	pMan->uPhase ^= 1 << ivp;
+    int nWords = Abc_TtWordNum(pMan->nVars);
+    int ivp = pMan->pPermTRev[iVar];
+    Abc_TtFlip(pMan->pTruth, nWords, ivp);
+    pMan->uPhase ^= 1 << ivp;
 }
 
 static inline void Abc_TgFlipSymGroupByVar(Abc_TgMan_t* pMan, int iVar)
 {
-	for (; iVar >= 0; iVar = pMan->symLink[iVar])
-		if (pMan->symPhase[iVar])
-			Abc_TgFlipVar(pMan, iVar);
+    for (; iVar >= 0; iVar = pMan->symLink[iVar])
+        if (pMan->symPhase[iVar])
+            Abc_TgFlipVar(pMan, iVar);
 }
 
 static inline void Abc_TgFlipSymGroup(Abc_TgMan_t* pMan, int idx)
 {
-	Abc_TgFlipSymGroupByVar(pMan, pMan->pPerm[idx]);
+    Abc_TgFlipSymGroupByVar(pMan, pMan->pPerm[idx]);
 }
 
 static inline void Abc_TgClearSymGroupPhase(Abc_TgMan_t* pMan, int iVar)
 {
-	for (; iVar >= 0; iVar = pMan->symLink[iVar])
-		pMan->symPhase[iVar] = 0;
+    for (; iVar >= 0; iVar = pMan->symLink[iVar])
+        pMan->symPhase[iVar] = 0;
 }
 
 static void Abc_TgImplementPerm(Abc_TgMan_t* pMan, const char *pPermDest)
 {
-	int i, nVars = pMan->nVars;
-	char *pPerm = pMan->pPermT;
-	char *pRev = pMan->pPermTRev;
-	unsigned uPhase = pMan->uPhase & (1 << nVars);
-
-	for (i = 0; i < nVars; i++)
-		pRev[(int)pPerm[i]] = i;
-	for (i = 0; i < nVars; i++)
-		pPerm[i] = pRev[(int)pPermDest[i]];
-	for (i = 0; i < nVars; i++)
-		pRev[(int)pPerm[i]] = i;
-
-	Abc_TtImplementNpnConfig(pMan->pTruth, nVars, pRev, 0);
-	Abc_TtNormalizeSmallTruth(pMan->pTruth, nVars);
-
-	for (i = 0; i < nVars; i++)
-	{
-		if (pMan->uPhase & (1 << pPerm[i]))
-			uPhase |= (1 << i);
-		pPerm[i] = pPermDest[i];
-		pRev[(int)pPerm[i]] = i;
-	}
-	pMan->uPhase = uPhase;
+    int i, nVars = pMan->nVars;
+    char *pPerm = pMan->pPermT;
+    char *pRev = pMan->pPermTRev;
+    unsigned uPhase = pMan->uPhase & (1 << nVars);
+
+    for (i = 0; i < nVars; i++)
+        pRev[(int)pPerm[i]] = i;
+    for (i = 0; i < nVars; i++)
+        pPerm[i] = pRev[(int)pPermDest[i]];
+    for (i = 0; i < nVars; i++)
+        pRev[(int)pPerm[i]] = i;
+
+    Abc_TtImplementNpnConfig(pMan->pTruth, nVars, pRev, 0);
+//  Abc_TtVerifySmallTruth(pMan->pTruth, nVars);
+
+    for (i = 0; i < nVars; i++)
+    {
+        if (pMan->uPhase & (1 << pPerm[i]))
+            uPhase |= (1 << i);
+        pPerm[i] = pPermDest[i];
+        pRev[(int)pPerm[i]] = i;
+    }
+    pMan->uPhase = uPhase;
 }
 
 static void Abc_TgSwapAdjacentSymGroups(Abc_TgMan_t* pMan, int idx)
 {
-	int iVar, jVar, ix;
-	char pPermNew[16];
-	assert(idx < pMan->nGVars - 1);
-	iVar = pMan->pPerm[idx];
-	jVar = pMan->pPerm[idx + 1];
-	pMan->pPerm[idx] = jVar;
-	pMan->pPerm[idx + 1] = iVar;
-	ABC_SWAP(char, pMan->pPermDir[idx], pMan->pPermDir[idx + 1]);
-	if (pMan->symLink[iVar] >= 0 || pMan->symLink[jVar] >= 0)
-	{
-		Abc_TgExpendSymmetry(pMan, pMan->pPerm, pPermNew);
-		Abc_TgImplementPerm(pMan, pPermNew);
-		return;
-	}
-	// plain variable swap
-	ix = pMan->pPermTRev[iVar];
-	assert(pMan->pPermT[ix] == iVar && pMan->pPermT[ix + 1] == jVar);
-	Abc_TtSwapAdjacent(pMan->pTruth, Abc_TtWordNum(pMan->nVars), ix);
-	pMan->pPermT[ix] = jVar;
-	pMan->pPermT[ix + 1] = iVar;
-	pMan->pPermTRev[iVar] = ix + 1;
-	pMan->pPermTRev[jVar] = ix;
-	if (((pMan->uPhase >> ix) & 1) != ((pMan->uPhase >> (ix + 1)) & 1))
-		pMan->uPhase ^= 1 << ix | 1 << (ix + 1);
-	assert(Abc_TgCannonVerify(pMan));
+    int iVar, jVar, ix;
+    char pPermNew[16];
+    assert(idx < pMan->nGVars - 1);
+    iVar = pMan->pPerm[idx];
+    jVar = pMan->pPerm[idx + 1];
+    pMan->pPerm[idx] = jVar;
+    pMan->pPerm[idx + 1] = iVar;
+    ABC_SWAP(char, pMan->pPermDir[idx], pMan->pPermDir[idx + 1]);
+    if (pMan->symLink[iVar] >= 0 || pMan->symLink[jVar] >= 0)
+    {
+        Abc_TgExpendSymmetry(pMan, pMan->pPerm, pPermNew);
+        Abc_TgImplementPerm(pMan, pPermNew);
+        return;
+    }
+    // plain variable swap
+    ix = pMan->pPermTRev[iVar];
+    assert(pMan->pPermT[ix] == iVar && pMan->pPermT[ix + 1] == jVar);
+    Abc_TtSwapAdjacent(pMan->pTruth, Abc_TtWordNum(pMan->nVars), ix);
+    pMan->pPermT[ix] = jVar;
+    pMan->pPermT[ix + 1] = iVar;
+    pMan->pPermTRev[iVar] = ix + 1;
+    pMan->pPermTRev[jVar] = ix;
+    if (((pMan->uPhase >> ix) & 1) != ((pMan->uPhase >> (ix + 1)) & 1))
+        pMan->uPhase ^= 1 << ix | 1 << (ix + 1);
+    assert(Abc_TgCannonVerify(pMan));
 }
 
 /**Function*************************************************************
@@ -1630,33 +1643,33 @@ static word pSymCopy[1024];
 
 static int Abc_TtIsSymmetric(word * pTruth, int nVars, int iVar, int jVar, int fPhase)
 {
-	int rv;
-	int nWords = Abc_TtWordNum(nVars);
-	Abc_TtCopy(pSymCopy, pTruth, nWords, 0);
-	Abc_TtSwapVars(pSymCopy, nVars, iVar, jVar);
-	rv = Abc_TtEqual(pTruth, pSymCopy, nWords) * 2;
-	if (!fPhase) return rv;
-	Abc_TtFlip(pSymCopy, nWords, iVar);
-	Abc_TtFlip(pSymCopy, nWords, jVar);
-	return rv + Abc_TtEqual(pTruth, pSymCopy, nWords);
+    int rv;
+    int nWords = Abc_TtWordNum(nVars);
+    Abc_TtCopy(pSymCopy, pTruth, nWords, 0);
+    Abc_TtSwapVars(pSymCopy, nVars, iVar, jVar);
+    rv = Abc_TtEqual(pTruth, pSymCopy, nWords) * 2;
+    if (!fPhase) return rv;
+    Abc_TtFlip(pSymCopy, nWords, iVar);
+    Abc_TtFlip(pSymCopy, nWords, jVar);
+    return rv + Abc_TtEqual(pTruth, pSymCopy, nWords);
 }
 
 static int Abc_TtIsSymmetricHigh(Abc_TgMan_t * pMan, int iVar, int jVar, int fPhase)
 {
-	int rv, iv, jv, n;
-	int nWords = Abc_TtWordNum(pMan->nVars);
-	Abc_TtCopy(pSymCopy, pMan->pTruth, nWords, 0);
-	for (n = 0, iv = iVar, jv = jVar; iv >= 0 && jv >= 0; iv = pMan->symLink[iv], jv = pMan->symLink[jv], n++)
-		Abc_TtSwapVars(pSymCopy, pMan->nVars, iv, jv);
-	assert(iv < 0 && jv < 0);	// two symmetric groups must have the same size 
-	rv = Abc_TtEqual(pMan->pTruth, pSymCopy, nWords) * 2;
-	if (!fPhase) return rv;
-	for (iv = iVar, jv = jVar; iv >= 0 && jv >= 0; iv = pMan->symLink[iv], jv = pMan->symLink[jv])
-	{
-		if (pMan->symPhase[iv]) Abc_TtFlip(pSymCopy, nWords, iv);
-		if (pMan->symPhase[jv]) Abc_TtFlip(pSymCopy, nWords, jv);
-	}
-	return rv + Abc_TtEqual(pMan->pTruth, pSymCopy, nWords);
+    int rv, iv, jv, n;
+    int nWords = Abc_TtWordNum(pMan->nVars);
+    Abc_TtCopy(pSymCopy, pMan->pTruth, nWords, 0);
+    for (n = 0, iv = iVar, jv = jVar; iv >= 0 && jv >= 0; iv = pMan->symLink[iv], jv = pMan->symLink[jv], n++)
+        Abc_TtSwapVars(pSymCopy, pMan->nVars, iv, jv);
+    assert(iv < 0 && jv < 0);   // two symmetric groups must have the same size 
+    rv = Abc_TtEqual(pMan->pTruth, pSymCopy, nWords) * 2;
+    if (!fPhase) return rv;
+    for (iv = iVar, jv = jVar; iv >= 0 && jv >= 0; iv = pMan->symLink[iv], jv = pMan->symLink[jv])
+    {
+        if (pMan->symPhase[iv]) Abc_TtFlip(pSymCopy, nWords, iv);
+        if (pMan->symPhase[jv]) Abc_TtFlip(pSymCopy, nWords, jv);
+    }
+    return rv + Abc_TtEqual(pMan->pTruth, pSymCopy, nWords);
 }
 
 /**Function*************************************************************
@@ -1665,7 +1678,7 @@ Synopsis    [Create groups by cofactor signatures]
 
 Description [Similar to Abc_TtSemiCanonicize. 
              Use stable insertion sort to keep the order of the variables in the groups.
-			 Defer permutation. ]
+             Defer permutation. ]
 
 SideEffects []
 
@@ -1675,53 +1688,53 @@ SeeAlso     []
 
 static void Abc_TgCreateGroups(Abc_TgMan_t * pMan)
 {
-	int pStore[17];
-	int i, j, nOnes;
-	int nVars = pMan->nVars, nWords = Abc_TtWordNum(nVars);
-	TiedGroup * pGrp = pMan->pGroup;
-	assert(nVars <= 16);
-	// normalize polarity    
-	nOnes = Abc_TtCountOnesInTruth(pMan->pTruth, nVars);
-	if (nOnes > (1 << (nVars - 1)))
-	{
-		Abc_TtNot(pMan->pTruth, nWords);
-		nOnes = (1 << nVars) - nOnes;
-		pMan->uPhase |= (1 << nVars);
-	}
-	// normalize phase
-	Abc_TtCountOnesInCofs(pMan->pTruth, nVars, pStore);
-	pStore[nVars] = nOnes;
-	for (i = 0; i < nVars; i++)
-	{
-		if (pStore[i] >= nOnes - pStore[i])
-			continue;
-		Abc_TtFlip(pMan->pTruth, nWords, i);
-		pMan->uPhase |= (1 << i);
-		pStore[i] = nOnes - pStore[i];
-	}
-
-	// sort variables
-	for (i = 1; i < nVars; i++)
-	{
-		int a = pStore[i]; char aa = pMan->pPerm[i];
-		for (j = i; j > 0 && pStore[j - 1] > a; j--)
-			pStore[j] = pStore[j - 1], pMan->pPerm[j] = pMan->pPerm[j - 1];
-		pStore[j] = a; pMan->pPerm[j] = aa;
-	}
-	// group variables
-//	Abc_SortIdxC(pStore, pMan->pPerm, nVars);
-	pGrp[0].iStart = 0;
-	pGrp[0].fPhased = pStore[0] * 2 != nOnes;
-	for (i = j = 1; i < nVars; i++)
-	{
-		if (pStore[i] == pStore[i - 1]) continue;
-		pGrp[j].iStart = i;
-		pGrp[j].fPhased = pStore[i] * 2 != nOnes;
-		pGrp[j - 1].nGVars = i - pGrp[j - 1].iStart;
-		j++;
-	}
-	pGrp[j - 1].nGVars = i - pGrp[j - 1].iStart;
-	pMan->nGroups = j;
+    int pStore[17];
+    int i, j, nOnes;
+    int nVars = pMan->nVars, nWords = Abc_TtWordNum(nVars);
+    TiedGroup * pGrp = pMan->pGroup;
+    assert(nVars <= 16);
+    // normalize polarity    
+    nOnes = Abc_TtCountOnesInTruth(pMan->pTruth, nVars);
+    if (nOnes > nWords * 32)
+    {
+        Abc_TtNot(pMan->pTruth, nWords);
+        nOnes = nWords * 64 - nOnes;
+        pMan->uPhase |= (1 << nVars);
+    }
+    // normalize phase
+    Abc_TtCountOnesInCofs(pMan->pTruth, nVars, pStore);
+    pStore[nVars] = nOnes;
+    for (i = 0; i < nVars; i++)
+    {
+        if (pStore[i] >= nOnes - pStore[i])
+            continue;
+        Abc_TtFlip(pMan->pTruth, nWords, i);
+        pMan->uPhase |= (1 << i);
+        pStore[i] = nOnes - pStore[i];
+    }
+
+    // sort variables
+    for (i = 1; i < nVars; i++)
+    {
+        int a = pStore[i]; char aa = pMan->pPerm[i];
+        for (j = i; j > 0 && pStore[j - 1] > a; j--)
+            pStore[j] = pStore[j - 1], pMan->pPerm[j] = pMan->pPerm[j - 1];
+        pStore[j] = a; pMan->pPerm[j] = aa;
+    }
+    // group variables
+//  Abc_SortIdxC(pStore, pMan->pPerm, nVars);
+    pGrp[0].iStart = 0;
+    pGrp[0].fPhased = pStore[0] * 2 != nOnes;
+    for (i = j = 1; i < nVars; i++)
+    {
+        if (pStore[i] == pStore[i - 1]) continue;
+        pGrp[j].iStart = i;
+        pGrp[j].fPhased = pStore[i] * 2 != nOnes;
+        pGrp[j - 1].nGVars = i - pGrp[j - 1].iStart;
+        j++;
+    }
+    pGrp[j - 1].nGVars = i - pGrp[j - 1].iStart;
+    pMan->nGroups = j;
 }
 
 /**Function*************************************************************
@@ -1738,135 +1751,135 @@ SeeAlso     []
 
 static int Abc_TgGroupSymmetry(Abc_TgMan_t * pMan, TiedGroup * pGrp, int doHigh)
 {
-	int i, j, iVar, jVar, nsym = 0;
-	int fDone[16], scnt[16], stype[16];
-	signed char *symLink = pMan->symLink;
-//	char * symPhase = pMan->symPhase;
-	int nGVars = pGrp->nGVars;
-	char * pVars = pMan->pPerm + pGrp->iStart;
-	int modified;
-
-	for (i = 0; i < nGVars; i++)
-		fDone[i] = 0, scnt[i] = 1;
-
-	do {
-		modified = 0;
-		for (i = 0; i < nGVars - 1; i++)
-		{
-			iVar = pVars[i];
-			if (iVar < 0 || fDone[i]) continue;
-//			if (!pGrp->fPhased && !Abc_TtHasVar(pMan->pTruth, pMan->nVars, iVar)) continue;
-			// Mark symmetric variables/groups
-			for (j = i + 1; j < nGVars; j++)
-			{
-				jVar = pVars[j];
-				if (jVar < 0 || scnt[j] != scnt[i])	// || pMan->symPhase[jVar] != pMan->symPhase[iVar])
-					stype[j] = 0;
-				else if (scnt[j] == 1)
-					stype[j] = Abc_TtIsSymmetric(pMan->pTruth, pMan->nVars, iVar, jVar, !pGrp->fPhased);
-				else
-					stype[j] = Abc_TtIsSymmetricHigh(pMan, iVar, jVar, !pGrp->fPhased);
-			}
-			fDone[i] = 1;
-			// Merge symmetric groups
-			for (j = i + 1; j < nGVars; j++)
-			{
-				int ii;
-				jVar = pVars[j];
-				switch (stype[j])
-				{
-				case 1:			// E-Symmetry
-					Abc_TgFlipSymGroupByVar(pMan, jVar);
-					// fallthrough
-				case 2:			// NE-Symmetry
-					pMan->symPhase[iVar] += pMan->symPhase[jVar];
-					break;
-				case 3:			// multiform Symmetry
-					Abc_TgClearSymGroupPhase(pMan, jVar);
-					break;
-				default:		// case 0: No Symmetry
-					continue;
-				}
-
-				for (ii = iVar; symLink[ii] >= 0; ii = symLink[ii])
-					;
-				symLink[ii] = jVar;
-				pVars[j] = -1;
-				scnt[i] += scnt[j];
-				modified = 1;
-				fDone[i] = 0;
-				nsym++;
-			}
-		}
-//		if (++order > 3) printf("%d", order);
-	} while (doHigh && modified);
-
-	return nsym;
+    int i, j, iVar, jVar, nsym = 0;
+    int fDone[16], scnt[16], stype[16];
+    signed char *symLink = pMan->symLink;
+//  char * symPhase = pMan->symPhase;
+    int nGVars = pGrp->nGVars;
+    char * pVars = pMan->pPerm + pGrp->iStart;
+    int modified;
+
+    for (i = 0; i < nGVars; i++)
+        fDone[i] = 0, scnt[i] = 1;
+
+    do {
+        modified = 0;
+        for (i = 0; i < nGVars - 1; i++)
+        {
+            iVar = pVars[i];
+            if (iVar < 0 || fDone[i]) continue;
+//          if (!pGrp->fPhased && !Abc_TtHasVar(pMan->pTruth, pMan->nVars, iVar)) continue;
+            // Mark symmetric variables/groups
+            for (j = i + 1; j < nGVars; j++)
+            {
+                jVar = pVars[j];
+                if (jVar < 0 || scnt[j] != scnt[i]) // || pMan->symPhase[jVar] != pMan->symPhase[iVar])
+                    stype[j] = 0;
+                else if (scnt[j] == 1)
+                    stype[j] = Abc_TtIsSymmetric(pMan->pTruth, pMan->nVars, iVar, jVar, !pGrp->fPhased);
+                else
+                    stype[j] = Abc_TtIsSymmetricHigh(pMan, iVar, jVar, !pGrp->fPhased);
+            }
+            fDone[i] = 1;
+            // Merge symmetric groups
+            for (j = i + 1; j < nGVars; j++)
+            {
+                int ii;
+                jVar = pVars[j];
+                switch (stype[j])
+                {
+                case 1:         // E-Symmetry
+                    Abc_TgFlipSymGroupByVar(pMan, jVar);
+                    // fallthrough
+                case 2:         // NE-Symmetry
+                    pMan->symPhase[iVar] += pMan->symPhase[jVar];
+                    break;
+                case 3:         // multiform Symmetry
+                    Abc_TgClearSymGroupPhase(pMan, jVar);
+                    break;
+                default:        // case 0: No Symmetry
+                    continue;
+                }
+
+                for (ii = iVar; symLink[ii] >= 0; ii = symLink[ii])
+                    ;
+                symLink[ii] = jVar;
+                pVars[j] = -1;
+                scnt[i] += scnt[j];
+                modified = 1;
+                fDone[i] = 0;
+                nsym++;
+            }
+        }
+//      if (++order > 3) printf("%d", order);
+    } while (doHigh && modified);
+
+    return nsym;
 }
 
 static void Abc_TgPurgeSymmetry(Abc_TgMan_t * pMan, int doHigh)
 {
-	int i, j, k, sum = 0, nVars = pMan->nVars;
-	signed char *symLink = pMan->symLink;
-	char gcnt[16] = { 0 };
-	char * pPerm = pMan->pPerm;
-
-	for (i = 0; i <= nVars; i++)
-		symLink[i] = -1;
-
-	// purge unsupported variables
-	if (!pMan->pGroup[0].fPhased)
-	{
-		int iVar = pMan->nVars;
-		for (j = 0; j < pMan->pGroup[0].nGVars; j++)
-		{
-			int jVar = pPerm[j];
-			assert(jVar >= 0);
-			if (!Abc_TtHasVar(pMan->pTruth, nVars, jVar))
-			{
-				symLink[jVar] = symLink[iVar];
-				symLink[iVar] = jVar;
-				pPerm[j] = -1;
-				gcnt[0]++;
-			}
-		}
-	}
-
-	for (k = 0; k < pMan->nGroups; k++)
-		gcnt[k] += Abc_TgGroupSymmetry(pMan, pMan->pGroup + k, doHigh);
-
-	for (i = 0; i < nVars && pPerm[i] >= 0; i++)
-		;
-	for (j = i + 1; ; i++, j++)
-	{
-		while (j < nVars && pPerm[j] < 0) j++;
-		if (j >= nVars) break;
-		pPerm[i] = pPerm[j];
-	}
-	for (k = 0; k < pMan->nGroups; k++)
-	{
-		pMan->pGroup[k].nGVars -= gcnt[k];
-		pMan->pGroup[k].iStart -= sum;
-		sum += gcnt[k];
-	}
-	if (pMan->pGroup[0].nGVars == 0)
-	{
-		pMan->nGroups--;
-		memmove(pMan->pGroup, pMan->pGroup + 1, sizeof(TiedGroup) * pMan->nGroups);
-		assert(pMan->pGroup[0].iStart == 0);
-	}
-	pMan->nGVars -= sum;
+    int i, j, k, sum = 0, nVars = pMan->nVars;
+    signed char *symLink = pMan->symLink;
+    char gcnt[16] = { 0 };
+    char * pPerm = pMan->pPerm;
+
+    for (i = 0; i <= nVars; i++)
+        symLink[i] = -1;
+
+    // purge unsupported variables
+    if (!pMan->pGroup[0].fPhased)
+    {
+        int iVar = pMan->nVars;
+        for (j = 0; j < pMan->pGroup[0].nGVars; j++)
+        {
+            int jVar = pPerm[j];
+            assert(jVar >= 0);
+            if (!Abc_TtHasVar(pMan->pTruth, nVars, jVar))
+            {
+                symLink[jVar] = symLink[iVar];
+                symLink[iVar] = jVar;
+                pPerm[j] = -1;
+                gcnt[0]++;
+            }
+        }
+    }
+
+    for (k = 0; k < pMan->nGroups; k++)
+        gcnt[k] += Abc_TgGroupSymmetry(pMan, pMan->pGroup + k, doHigh);
+
+    for (i = 0; i < nVars && pPerm[i] >= 0; i++)
+        ;
+    for (j = i + 1; ; i++, j++)
+    {
+        while (j < nVars && pPerm[j] < 0) j++;
+        if (j >= nVars) break;
+        pPerm[i] = pPerm[j];
+    }
+    for (k = 0; k < pMan->nGroups; k++)
+    {
+        pMan->pGroup[k].nGVars -= gcnt[k];
+        pMan->pGroup[k].iStart -= sum;
+        sum += gcnt[k];
+    }
+    if (pMan->pGroup[0].nGVars == 0)
+    {
+        pMan->nGroups--;
+        memmove(pMan->pGroup, pMan->pGroup + 1, sizeof(TiedGroup) * pMan->nGroups);
+        assert(pMan->pGroup[0].iStart == 0);
+    }
+    pMan->nGVars -= sum;
 }
 
 void Abc_TgExpendSymmetry(Abc_TgMan_t * pMan, char * pPerm, char * pDest)
 {
-	int i = 0, j, k;
-	for (j = 0; j < pMan->nGVars; j++)
-		for (k = pPerm[j]; k >= 0; k = pMan->symLink[k])
-			pDest[i++] = k;
-	for (k = pMan->symLink[pMan->nVars]; k >= 0; k = pMan->symLink[k])
-		pDest[i++] = k;
-	assert(i == pMan->nVars);
+    int i = 0, j, k;
+    for (j = 0; j < pMan->nGVars; j++)
+        for (k = pPerm[j]; k >= 0; k = pMan->symLink[k])
+            pDest[i++] = k;
+    for (k = pMan->symLink[pMan->nVars]; k >= 0; k = pMan->symLink[k])
+        pDest[i++] = k;
+    assert(i == pMan->nVars);
 }
 
 
@@ -1883,130 +1896,130 @@ SeeAlso     []
 ***********************************************************************/
 static int Abc_TgSymGroupPerm(Abc_TgMan_t* pMan, int idx, TiedGroup* pTGrp)
 {
-	word* pTruth = pMan->pTruth;
-	static word pCopy[1024];
-	static word pBest[1024];
-	int Config = 0;
-	int nWords = Abc_TtWordNum(pMan->nVars);
-	Abc_TgMan_t tgManCopy, tgManBest;
-	int fSwapOnly = pTGrp->fPhased;
-
-	CheckConfig(pMan);
-	if (fSwapOnly)
-	{
-		Abc_TgManCopy(&tgManCopy, pCopy, pMan);
-		Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
-		CheckConfig(&tgManCopy);
-		if (Abc_TtCompareRev(pTruth, pCopy, nWords) < 0)
-		{
-			Abc_TgManCopy(pMan, pTruth, &tgManCopy);
-			return 4;
-		}
-		return 0;
-	}
-
-	// save two copies
-	Abc_TgManCopy(&tgManCopy, pCopy, pMan);
-	Abc_TgManCopy(&tgManBest, pBest, pMan);
-	// PXY
-	// 001
-	Abc_TgFlipSymGroup(&tgManCopy, idx);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 1;
-	// PXY
-	// 011
-	Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 3;
-	// PXY
-	// 010
-	Abc_TgFlipSymGroup(&tgManCopy, idx);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 2;
-	// PXY
-	// 110
-	Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 6;
-	// PXY
-	// 111
-	Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 7;
-	// PXY
-	// 101
-	Abc_TgFlipSymGroup(&tgManCopy, idx);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 5;
-	// PXY
-	// 100
-	Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
-	CheckConfig(&tgManCopy);
-	if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
-		Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 4;
-	// PXY
-	// 000
-	Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
-	CheckConfig(&tgManCopy);
-	assert(Abc_TtEqual(pTruth, pCopy, nWords));
-	if (Config == 0)
-		return 0;
-	assert(Abc_TtCompareRev(pTruth, pBest, nWords) == 1);
-	Abc_TgManCopy(pMan, pTruth, &tgManBest);
-	return Config;
+    word* pTruth = pMan->pTruth;
+    static word pCopy[1024];
+    static word pBest[1024];
+    int Config = 0;
+    int nWords = Abc_TtWordNum(pMan->nVars);
+    Abc_TgMan_t tgManCopy, tgManBest;
+    int fSwapOnly = pTGrp->fPhased;
+
+    CheckConfig(pMan);
+    if (fSwapOnly)
+    {
+        Abc_TgManCopy(&tgManCopy, pCopy, pMan);
+        Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
+        CheckConfig(&tgManCopy);
+        if (Abc_TtCompareRev(pTruth, pCopy, nWords) < 0)
+        {
+            Abc_TgManCopy(pMan, pTruth, &tgManCopy);
+            return 4;
+        }
+        return 0;
+    }
+
+    // save two copies
+    Abc_TgManCopy(&tgManCopy, pCopy, pMan);
+    Abc_TgManCopy(&tgManBest, pBest, pMan);
+    // PXY
+    // 001
+    Abc_TgFlipSymGroup(&tgManCopy, idx);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 1;
+    // PXY
+    // 011
+    Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 3;
+    // PXY
+    // 010
+    Abc_TgFlipSymGroup(&tgManCopy, idx);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 2;
+    // PXY
+    // 110
+    Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 6;
+    // PXY
+    // 111
+    Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 7;
+    // PXY
+    // 101
+    Abc_TgFlipSymGroup(&tgManCopy, idx);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 5;
+    // PXY
+    // 100
+    Abc_TgFlipSymGroup(&tgManCopy, idx + 1);
+    CheckConfig(&tgManCopy);
+    if (Abc_TtCompareRev(pBest, pCopy, nWords) == 1)
+        Abc_TgManCopy(&tgManBest, pBest, &tgManCopy), Config = 4;
+    // PXY
+    // 000
+    Abc_TgSwapAdjacentSymGroups(&tgManCopy, idx);
+    CheckConfig(&tgManCopy);
+    assert(Abc_TtEqual(pTruth, pCopy, nWords));
+    if (Config == 0)
+        return 0;
+    assert(Abc_TtCompareRev(pTruth, pBest, nWords) == 1);
+    Abc_TgManCopy(pMan, pTruth, &tgManBest);
+    return Config;
 }
 
 static int Abc_TgPermPhase(Abc_TgMan_t* pMan, int iVar)
 {
-	static word pCopy[1024];
-	int nWords = Abc_TtWordNum(pMan->nVars);
-	int ivp = pMan->pPermTRev[iVar];
-	Abc_TtCopy(pCopy, pMan->pTruth, nWords, 0);
-	Abc_TtFlip(pCopy, nWords, ivp);
-	if (Abc_TtCompareRev(pMan->pTruth, pCopy, nWords) == 1)
-	{
-		Abc_TtCopy(pMan->pTruth, pCopy, nWords, 0);
-		pMan->uPhase ^= 1 << ivp;
-		return 16;
-	}
-	return 0;
+    static word pCopy[1024];
+    int nWords = Abc_TtWordNum(pMan->nVars);
+    int ivp = pMan->pPermTRev[iVar];
+    Abc_TtCopy(pCopy, pMan->pTruth, nWords, 0);
+    Abc_TtFlip(pCopy, nWords, ivp);
+    if (Abc_TtCompareRev(pMan->pTruth, pCopy, nWords) == 1)
+    {
+        Abc_TtCopy(pMan->pTruth, pCopy, nWords, 0);
+        pMan->uPhase ^= 1 << ivp;
+        return 16;
+    }
+    return 0;
 }
 
 static void Abc_TgSimpleEnumeration(Abc_TgMan_t * pMan)
 {
-	int i, j, k;
-	int pGid[16];
-
-	for (k = j = 0; j < pMan->nGroups; j++)
-		for (i = 0; i < pMan->pGroup[j].nGVars; i++, k++)
-			pGid[k] = j;
-	assert(k == pMan->nGVars);
-
-	for (k = 0; k < 5; k++)
-	{
-		int fChanges = 0;
-		for (i = pMan->nGVars - 2; i >= 0; i--)
-			if (pGid[i] == pGid[i + 1])
-				fChanges |= Abc_TgSymGroupPerm(pMan, i, pMan->pGroup + pGid[i]);
-		for (i = 1; i < pMan->nGVars - 1; i++)
-			if (pGid[i] == pGid[i + 1])
-				fChanges |= Abc_TgSymGroupPerm(pMan, i, pMan->pGroup + pGid[i]);
-
-		for (i = pMan->nVars - 1; i >= 0; i--)
-			if (pMan->symPhase[i])
-				fChanges |= Abc_TgPermPhase(pMan, i);
-		for (i = 1; i < pMan->nVars; i++)
-			if (pMan->symPhase[i])
-				fChanges |= Abc_TgPermPhase(pMan, i);
-		if (!fChanges) break;
-	}
-	assert(Abc_TgCannonVerify(pMan));
+    int i, j, k;
+    int pGid[16];
+
+    for (k = j = 0; j < pMan->nGroups; j++)
+        for (i = 0; i < pMan->pGroup[j].nGVars; i++, k++)
+            pGid[k] = j;
+    assert(k == pMan->nGVars);
+
+    for (k = 0; k < 5; k++)
+    {
+        int fChanges = 0;
+        for (i = pMan->nGVars - 2; i >= 0; i--)
+            if (pGid[i] == pGid[i + 1])
+                fChanges |= Abc_TgSymGroupPerm(pMan, i, pMan->pGroup + pGid[i]);
+        for (i = 1; i < pMan->nGVars - 1; i++)
+            if (pGid[i] == pGid[i + 1])
+                fChanges |= Abc_TgSymGroupPerm(pMan, i, pMan->pGroup + pGid[i]);
+
+        for (i = pMan->nVars - 1; i >= 0; i--)
+            if (pMan->symPhase[i])
+                fChanges |= Abc_TgPermPhase(pMan, i);
+        for (i = 1; i < pMan->nVars; i++)
+            if (pMan->symPhase[i])
+                fChanges |= Abc_TgPermPhase(pMan, i);
+        if (!fChanges) break;
+    }
+    assert(Abc_TgCannonVerify(pMan));
 }
 
 /**Function*************************************************************
@@ -2023,194 +2036,198 @@ SeeAlso     []
 // enumeration time = exp((cost-27.12)*0.59)
 static int Abc_TgEnumerationCost(Abc_TgMan_t * pMan)
 {
-	int cSym = 0;
-	double cPerm = 0.0;
-	TiedGroup * pGrp = 0;
-	int i, j, n;
-	if (pMan->nGroups == 0) return 0;
-
-	for (i = 0; i < pMan->nGroups; i++)
-	{
-		pGrp = pMan->pGroup + i;
-		n = pGrp->nGVars;
-		if (n > 1)
-			cPerm += 0.92 + log(n) / 2 + n * (log(n) - 1);
-	}
-	if (pMan->pGroup->fPhased)
-		n = 0;
-	else
-	{
-		char * pVars = pMan->pPerm;
-		n = pMan->pGroup->nGVars;
-		for (i = 0; i < n; i++)
-			for (j = pVars[i]; j >= 0; j = pMan->symLink[j])
-				cSym++;
-	}
-	// coefficients computed by linear regression
-	return pMan->nVars + n * 1.09 + cPerm * 1.65 + 0.5; 
-//	return (rv > 60 ? 100000000 : 0) + n * 1000000 + cSym * 10000 + cPerm * 100 + 0.5;
+    int cSym = 0;
+    double cPerm = 0.0;
+    TiedGroup * pGrp = 0;
+    int i, j, n;
+    if (pMan->nGroups == 0) return 0;
+
+    for (i = 0; i < pMan->nGroups; i++)
+    {
+        pGrp = pMan->pGroup + i;
+        n = pGrp->nGVars;
+        if (n > 1)
+            cPerm += 0.92 + log(n) / 2 + n * (log(n) - 1);
+    }
+    if (pMan->pGroup->fPhased)
+        n = 0;
+    else
+    {
+        char * pVars = pMan->pPerm;
+        n = pMan->pGroup->nGVars;
+        for (i = 0; i < n; i++)
+            for (j = pVars[i]; j >= 0; j = pMan->symLink[j])
+                cSym++;
+    }
+    // coefficients computed by linear regression
+    return pMan->nVars + n * 1.09 + cPerm * 1.65 + 0.5; 
+//  return (rv > 60 ? 100000000 : 0) + n * 1000000 + cSym * 10000 + cPerm * 100 + 0.5;
 }
 
 static int Abc_TgIsInitPerm(char * pData, signed char * pDir, int size)
 {
-	int i;
-	if (pDir[0] != -1) return 0;
-	for (i = 1; i < size; i++)
-		if (pDir[i] != -1 || pData[i] < pData[i - 1])
-			return 0;
-	return 1;
+    int i;
+    if (pDir[0] != -1) return 0;
+    for (i = 1; i < size; i++)
+        if (pDir[i] != -1 || pData[i] < pData[i - 1])
+            return 0;
+    return 1;
 }
 
 static void Abc_TgFirstPermutation(Abc_TgMan_t * pMan)
 {
-	int i;
-	for (i = 0; i < pMan->nGVars; i++)
-		pMan->pPermDir[i] = -1;
+    int i;
+    for (i = 0; i < pMan->nGVars; i++)
+        pMan->pPermDir[i] = -1;
 #ifndef NDEBUG
-	for (i = 0; i < pMan->nGroups; i++)
-	{
-		TiedGroup * pGrp = pMan->pGroup + i;
-		int nGvars = pGrp->nGVars;
-		char * pVars = pMan->pPerm + pGrp->iStart;
-		signed char * pDirs = pMan->pPermDir + pGrp->iStart;
-		assert(Abc_TgIsInitPerm(pVars, pDirs, nGvars));
-	}
+    for (i = 0; i < pMan->nGroups; i++)
+    {
+        TiedGroup * pGrp = pMan->pGroup + i;
+        int nGvars = pGrp->nGVars;
+        char * pVars = pMan->pPerm + pGrp->iStart;
+        signed char * pDirs = pMan->pPermDir + pGrp->iStart;
+        assert(Abc_TgIsInitPerm(pVars, pDirs, nGvars));
+    }
 #endif
 }
 
 static int Abc_TgNextPermutation(Abc_TgMan_t * pMan)
 {
-	int i, j, nGvars;
-	TiedGroup * pGrp;
-	char * pVars;
-	signed char * pDirs;
-	for (i = 0; i < pMan->nGroups; i++)
-	{
-		pGrp = pMan->pGroup + i;
-		nGvars = pGrp->nGVars;
-		if (nGvars == 1) continue;
-		pVars = pMan->pPerm + pGrp->iStart;
-		pDirs = pMan->pPermDir + pGrp->iStart;
-		j = Abc_NextPermSwapC(pVars, pDirs, nGvars);
-		if (j >= 0)
-		{
-			Abc_TgSwapAdjacentSymGroups(pMan, j + pGrp->iStart);
-			return 1;
-		}
-		Abc_TgSwapAdjacentSymGroups(pMan, pGrp->iStart);
-		assert(Abc_TgIsInitPerm(pVars, pDirs, nGvars));
-	}
-	return 0;
+    int i, j, nGvars;
+    TiedGroup * pGrp;
+    char * pVars;
+    signed char * pDirs;
+    for (i = 0; i < pMan->nGroups; i++)
+    {
+        pGrp = pMan->pGroup + i;
+        nGvars = pGrp->nGVars;
+        if (nGvars == 1) continue;
+        pVars = pMan->pPerm + pGrp->iStart;
+        pDirs = pMan->pPermDir + pGrp->iStart;
+        j = Abc_NextPermSwapC(pVars, pDirs, nGvars);
+        if (j >= 0)
+        {
+            Abc_TgSwapAdjacentSymGroups(pMan, j + pGrp->iStart);
+            return 1;
+        }
+        Abc_TgSwapAdjacentSymGroups(pMan, pGrp->iStart);
+        assert(Abc_TgIsInitPerm(pVars, pDirs, nGvars));
+    }
+    return 0;
 }
 
 static inline unsigned grayCode(unsigned a) { return a ^ (a >> 1); }
 
-static int grayFlip(unsigned a, int n)
+static int grayFlip(unsigned a)
 {
-	unsigned d = grayCode(a) ^ grayCode(a + 1);
-	int i;
-	for (i = 0; i < n; i++)
-		if (d == 1U << i) return i;
-	assert(0);
-    return -1;
-}
+    int i;
+    for (i = 0, a++; ; i++)
+        if (a & (1 << i))   return i;
+ }
 
 static inline void Abc_TgSaveBest(Abc_TgMan_t * pMan, Abc_TgMan_t * pBest)
 {
-	if (Abc_TtCompare(pBest->pTruth, pMan->pTruth, Abc_TtWordNum(pMan->nVars)) == 1)
-		Abc_TgManCopy(pBest, pBest->pTruth, pMan);
+    if (Abc_TtCompare(pBest->pTruth, pMan->pTruth, Abc_TtWordNum(pMan->nVars)) == 1)
+        Abc_TgManCopy(pBest, pBest->pTruth, pMan);
 }
 
 static void Abc_TgPhaseEnumeration(Abc_TgMan_t * pMan, Abc_TgMan_t * pBest)
 {
-	char pFGrps[16];
-	TiedGroup * pGrp = pMan->pGroup;
-	int i, j, n = pGrp->nGVars;
-
-	Abc_TgSaveBest(pMan, pBest);
-	if (pGrp->fPhased) return;
-
-	// sort by symPhase
-	for (i = 0; i < n; i++)
-	{
-		char iv = pMan->pPerm[i];		
-		for (j = i; j > 0 && pMan->symPhase[(int)pFGrps[j-1]] > pMan->symPhase[(int)iv]; j--)
-			pFGrps[j] = pFGrps[j - 1];
-		pFGrps[j] = iv;
-	}
-
-	for (i = 0; i < (1 << n) - 1; i++)
-	{
-		Abc_TgFlipSymGroupByVar(pMan, pFGrps[grayFlip(i, n)]);
-		Abc_TgSaveBest(pMan, pBest);
-	}
+    char pFGrps[16];
+    TiedGroup * pGrp = pMan->pGroup;
+    int i, j, n = pGrp->nGVars;
+
+    Abc_TgSaveBest(pMan, pBest);
+    if (pGrp->fPhased) return;
+
+    // sort by symPhase
+    for (i = 0; i < n; i++)
+    {
+        char iv = pMan->pPerm[i];       
+        for (j = i; j > 0 && pMan->symPhase[(int)pFGrps[j-1]] > pMan->symPhase[(int)iv]; j--)
+            pFGrps[j] = pFGrps[j - 1];
+        pFGrps[j] = iv;
+    }
+
+    for (i = 0; i < (1 << n) - 1; i++)
+    {
+        Abc_TgFlipSymGroupByVar(pMan, pFGrps[grayFlip(i)]);
+        Abc_TgSaveBest(pMan, pBest);
+    }
 }
 
 static void Abc_TgFullEnumeration(Abc_TgMan_t * pWork, Abc_TgMan_t * pBest)
 {
-//	static word pCopy[1024];
-//	Abc_TgMan_t tgManCopy;
-//	Abc_TgManCopy(&tgManCopy, pCopy, pMan);
-
-	Abc_TgFirstPermutation(pWork);
-	do Abc_TgPhaseEnumeration(pWork, pBest);
-	while (Abc_TgNextPermutation(pWork));
-	pBest->uPhase |= 1U << 30;
+//  static word pCopy[1024];
+//  Abc_TgMan_t tgManCopy;
+//  Abc_TgManCopy(&tgManCopy, pCopy, pMan);
+
+    Abc_TgFirstPermutation(pWork);
+    do Abc_TgPhaseEnumeration(pWork, pBest);
+    while (Abc_TgNextPermutation(pWork));
+    pBest->uPhase |= 1 << 30;
 }
 
 unsigned Abc_TtCanonicizeAda(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int iThres)
 {
-	int nWords = Abc_TtWordNum(nVars);
-	unsigned fExac = 0, fHash = 1U << 29;
-	static word pCopy[1024];
-	Abc_TgMan_t tgMan, tgManCopy;
-	int iCost;
-	const int MaxCost = 84;  // maximun posible cost for function with 16 inputs 
-	const int doHigh = iThres / 100, iEnumThres = iThres % 100;
+    int nWords = Abc_TtWordNum(nVars);
+    unsigned fExac = 0, fHash = 1 << 29;
+    static word pCopy[1024];
+    Abc_TgMan_t tgMan, tgManCopy;
+    int iCost;
+    const int MaxCost = 84;  // maximun posible cost for function with 16 inputs 
+    const int doHigh = iThres / 100, iEnumThres = iThres % 100;
 
+    // handle constant
+    if ( nVars == 0 ) {
+        Abc_TtClear( pTruth, nWords );
+        return 0;
+    }
+
+    Abc_TtVerifySmallTruth(pTruth, nVars);
 #ifdef CANON_VERIFY
-	Abc_TtCopy(gpVerCopy, pTruth, nWords, 0);
+    Abc_TtCopy(gpVerCopy, pTruth, nWords, 0);
 #endif
 
-	assert(nVars <= 16);
-	if (p && Abc_TtHieRetrieveOrInsert(p, -5, pTruth, pTruth) > 0) return fHash;
-	Abc_TginitMan(&tgMan, pTruth, nVars);
-	Abc_TgCreateGroups(&tgMan);
-	if (p && Abc_TtHieRetrieveOrInsert(p, -4, pTruth, pTruth) > 0) return fHash;
-	Abc_TgPurgeSymmetry(&tgMan, doHigh);
-
-	Abc_TgExpendSymmetry(&tgMan, tgMan.pPerm, pCanonPerm);
-	Abc_TgImplementPerm(&tgMan, pCanonPerm);
-	assert(Abc_TgCannonVerify(&tgMan));
-
-	if (p == NULL) {
-		if (iEnumThres > MaxCost || Abc_TgEnumerationCost(&tgMan) < iEnumThres) {
-			Abc_TgManCopy(&tgManCopy, pCopy, &tgMan);
-			Abc_TgFullEnumeration(&tgManCopy, &tgMan);
-		}
-		else
-			Abc_TgSimpleEnumeration(&tgMan);
-	}
-	else {
-		iCost = Abc_TgEnumerationCost(&tgMan);
-		if (iCost < iEnumThres) fExac = 1U << 30;
-		if (Abc_TtHieRetrieveOrInsert(p, -3, pTruth, pTruth) > 0) return fHash + fExac;
-		Abc_TgManCopy(&tgManCopy, pCopy, &tgMan);
-		Abc_TgSimpleEnumeration(&tgMan);
-		if (Abc_TtHieRetrieveOrInsert(p, -2, pTruth, pTruth) > 0) return fHash + fExac;
-		if (fExac) {
-			Abc_TgManCopy(&tgMan, pTruth, &tgManCopy);
-			Abc_TgFullEnumeration(&tgManCopy, &tgMan);
-		}
-		Abc_TtHieRetrieveOrInsert(p, -1, pTruth, pTruth);
-	}
-	memcpy(pCanonPerm, tgMan.pPermT, sizeof(char) * nVars);
+    assert(nVars <= 16);
+    if (p && Abc_TtHieRetrieveOrInsert(p, -5, pTruth, pTruth) > 0) return fHash;
+    Abc_TginitMan(&tgMan, pTruth, nVars);
+    Abc_TgCreateGroups(&tgMan);
+    if (p && Abc_TtHieRetrieveOrInsert(p, -4, pTruth, pTruth) > 0) return fHash;
+    Abc_TgPurgeSymmetry(&tgMan, doHigh);
+
+    Abc_TgExpendSymmetry(&tgMan, tgMan.pPerm, pCanonPerm);
+    Abc_TgImplementPerm(&tgMan, pCanonPerm);
+    assert(Abc_TgCannonVerify(&tgMan));
+
+    if (p == NULL) {
+        if (iEnumThres > MaxCost || Abc_TgEnumerationCost(&tgMan) < iEnumThres) {
+            Abc_TgManCopy(&tgManCopy, pCopy, &tgMan);
+            Abc_TgFullEnumeration(&tgManCopy, &tgMan);
+        }
+        else
+            Abc_TgSimpleEnumeration(&tgMan);
+    }
+    else {
+        iCost = Abc_TgEnumerationCost(&tgMan);
+        if (iCost < iEnumThres) fExac = 1 << 30;
+        if (Abc_TtHieRetrieveOrInsert(p, -3, pTruth, pTruth) > 0) return fHash + fExac;
+        Abc_TgManCopy(&tgManCopy, pCopy, &tgMan);
+        Abc_TgSimpleEnumeration(&tgMan);
+        if (Abc_TtHieRetrieveOrInsert(p, -2, pTruth, pTruth) > 0) return fHash + fExac;
+        if (fExac) {
+            Abc_TgManCopy(&tgMan, pTruth, &tgManCopy);
+            Abc_TgFullEnumeration(&tgManCopy, &tgMan);
+        }
+        Abc_TtHieRetrieveOrInsert(p, -1, pTruth, pTruth);
+    }
+    memcpy(pCanonPerm, tgMan.pPermT, sizeof(char) * nVars);
 
 #ifdef CANON_VERIFY
-	if (!Abc_TgCannonVerify(&tgMan))
-		printf("Canonical form verification failed!\n");
+    if (!Abc_TgCannonVerify(&tgMan))
+        printf("Canonical form verification failed!\n");
 #endif
-	return tgMan.uPhase;
+    return tgMan.uPhase;
 }
 
 ////////////////////////////////////////////////////////////////////////
diff --git a/src/opt/dau/dauNpn.c b/src/opt/dau/dauNpn.c
index dacdb02a..b57ade67 100644
--- a/src/opt/dau/dauNpn.c
+++ b/src/opt/dau/dauNpn.c
@@ -604,16 +604,8 @@ int Dau_PrintStats( int nNodes, int nInputs, int nVars, Vec_Int_t * vNodSup, int
     fflush(stdout);
     return nNew;
 }
-int Dau_RunNpn( Abc_TtHieMan_t * pMan, word * pTruth, int nVars, char * pCanonPerm )
-{
-    typedef unsigned(*TtCanonicizeFunc)(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag);
-    unsigned Abc_TtCanonicizeWrap(TtCanonicizeFunc func, Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int flag);
-    unsigned Abc_TtCanonicizeAda(Abc_TtHieMan_t * p, word * pTruth, int nVars, char * pCanonPerm, int iThres);
-    if ( nVars < 6 )
-        return Abc_TtCanonicizeWrap( Abc_TtCanonicizeAda, NULL, pTruth, nVars, pCanonPerm, 99 );
-    else
-        return Abc_TtCanonicizeWrap( Abc_TtCanonicizeAda, pMan, pTruth, nVars, pCanonPerm, 99 );
-}
+
+
 int Dau_InsertFunction( Abc_TtHieMan_t * pMan, word * pCur, int nNodes, int nInputs, int nVars0, int nVars, 
     Vec_Mem_t * vTtMem, Vec_Int_t * vNodSup, int nFronts, abctime clk )
 {
@@ -621,7 +613,7 @@ int Dau_InsertFunction( Abc_TtHieMan_t * pMan, word * pCur, int nNodes, int nInp
     char Perm[16] = {0};
     int nVarsNew = Abc_TtMinBase( pCur, NULL, nVars, nInputs );
     //unsigned Phase = Abc_TtCanonicizeHie( pMan, pCur, nVarsNew, Perm, 1 );
-    unsigned Phase = Dau_RunNpn( pMan, pCur, nInputs, Perm );
+    unsigned Phase = Abc_TtCanonicizeWrap( Abc_TtCanonicizeAda, pMan, pCur, nVarsNew, Perm, 99 );
     int nEntries = Vec_MemEntryNum(vTtMem);
     int Entry = Vec_MemHashInsert( vTtMem, pCur );
     if ( nEntries == Vec_MemEntryNum(vTtMem) ) // found in the table - not new
@@ -639,7 +631,7 @@ void Dau_FunctionEnum( int nInputs, int nVars, int nNodeMax, int fUseTwo, int fR
 {
     abctime clk = Abc_Clock();
     int nWords = Abc_TtWordNum(nInputs); word nSteps = 0;
-	Abc_TtHieMan_t * pMan = Abc_TtHieManStart( nInputs, 5 );
+    Abc_TtHieMan_t * pMan = Abc_TtHieManStart( nInputs, 5 );
     Vec_Mem_t * vTtMem  = Vec_MemAlloc( nWords, 16 );
     Vec_Int_t * vNodSup = Vec_IntAlloc( 1 << 16 );
     int v, u, k, m, n, Entry, nNew, Limit[32] = {1, 2};
@@ -809,7 +801,7 @@ void Dau_FunctionEnum( int nInputs, int nVars, int nNodeMax, int fUseTwo, int fR
     Abc_PrintTime( 1, "Total time", Abc_Clock() - clk );
     //Dau_DumpFuncs( vTtMem, vNodSup, nVars, nNodeMax );
     //Dau_ExactNpnPrint( vTtMem, vNodSup, nVars, nInputs, n );
-	Abc_TtHieManStop( pMan );
+    Abc_TtHieManStop( pMan );
     Vec_MemHashFree( vTtMem );
     Vec_MemFreeP( &vTtMem );
     Vec_IntFree( vNodSup );