Move truth table code into a separte file.

5 files changed, 335 insertions, 303 deletions

diff --git a/abclib.dsp b/abclib.dsp
index 51a06e45..c8883c5a 100644
--- a/abclib.dsp
+++ b/abclib.dsp
@@ -2709,6 +2709,10 @@ SOURCE=.\src\misc\util\utilSignal.h
 
 SOURCE=.\src\misc\util\utilSort.c
 # End Source File
+# Begin Source File
+
+SOURCE=.\src\misc\util\utilTruth.h
+# End Source File
 # End Group
 # Begin Group "nm"
 
diff --git a/src/base/abci/abcRec3.c b/src/base/abci/abcRec3.c
index 5f9b6b4f..ed6148ab 100644
--- a/src/base/abci/abcRec3.c
+++ b/src/base/abci/abcRec3.c
@@ -24,6 +24,7 @@
 #include "aig/gia/giaAig.h"
 #include "misc/vec/vecMem.h"
 #include "bool/lucky/lucky.h"
+#include "misc/util/utilTruth.h"
 
 ABC_NAMESPACE_IMPL_START
 
@@ -407,48 +408,6 @@ void Lms_GiaProfilesPrint( Gia_Man_t * p )
 
 /**Function*************************************************************
 
-  Synopsis    [Stretch truthtable to have more input variables.]
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static void Abc_TtStretch5( unsigned * pInOut, int nVarS, int nVarB )
-{
-    int w, i, step, nWords;
-    if ( nVarS == nVarB )
-        return;
-    assert( nVarS < nVarB );
-    step = Abc_TruthWordNum(nVarS);
-    nWords = Abc_TruthWordNum(nVarB);
-    if ( step == nWords )
-        return;
-    assert( step < nWords );
-    for ( w = 0; w < nWords; w += step )
-        for ( i = 0; i < step; i++ )
-            pInOut[w + i] = pInOut[i];              
-}
-static void Abc_TtStretch6( word * pInOut, int nVarS, int nVarB )
-{
-    int w, i, step, nWords;
-    if ( nVarS == nVarB )
-        return;
-    assert( nVarS < nVarB );
-    step = Abc_Truth6WordNum(nVarS);
-    nWords = Abc_Truth6WordNum(nVarB);
-    if ( step == nWords )
-        return;
-    assert( step < nWords );
-    for ( w = 0; w < nWords; w += step )
-        for ( i = 0; i < step; i++ )
-            pInOut[w + i] = pInOut[i];              
-}
-
-/**Function*************************************************************
-
   Synopsis    [Compute support sizes for each CO.]
 
   Description []
diff --git a/src/map/if/if.h b/src/map/if/if.h
index 0d80d495..9e649e0c 100644
--- a/src/map/if/if.h
+++ b/src/map/if/if.h
@@ -535,7 +535,7 @@ extern void            If_ObjPrint( If_Obj_t * pObj );
 /*=== abcRec3.c ============================================================*/
 extern int             If_CutDelayRecCost(If_Man_t* p, If_Cut_t* pCut, If_Obj_t * pObj);
 extern int             If_CutDelayRecCost2(If_Man_t* p, If_Cut_t* pCut, If_Obj_t * pObj);
-extern int             If_CutDelayRecCost2(If_Man_t* p, If_Cut_t* pCut, If_Obj_t * pObj);
+extern int             If_CutDelayRecCost3(If_Man_t* p, If_Cut_t* pCut, If_Obj_t * pObj);
 extern ABC_DLL int     Abc_NtkRecIsRunning();
 extern ABC_DLL int     Abc_NtkRecIsRunning2();
 extern ABC_DLL int     Abc_NtkRecIsRunning3();
diff --git a/src/map/if/ifTruth.c b/src/map/if/ifTruth.c
index 87473767..4b0db8b4 100644
--- a/src/map/if/ifTruth.c
+++ b/src/map/if/ifTruth.c
@@ -19,6 +19,7 @@
 ***********************************************************************/
 
 #include "if.h"
+#include "misc/util/utilTruth.h"
 
 ABC_NAMESPACE_IMPL_START
 
@@ -450,261 +451,6 @@ int If_CutTruthMinimize( If_Man_t * p, If_Cut_t * pCut )
 
 
 
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static inline int  Abc_TtWordNum( int nVars ) { return nVars <= 6 ? 1 : 1 << (nVars-6); }
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static inline void Abc_TtCopy( word * pOut, word * pIn, int nWords, int fCompl )
-{
-    int w;
-    if ( fCompl )
-        for ( w = 0; w < nWords; w++ )
-            pOut[w] = ~pIn[w];
-    else
-        for ( w = 0; w < nWords; w++ )
-            pOut[w] = pIn[w];
-}
-static inline void Abc_TtAnd( word * pOut, word * pIn1, word * pIn2, int nWords, int fCompl )
-{
-    int w;
-    if ( fCompl )
-        for ( w = 0; w < nWords; w++ )
-            pOut[w] = ~(pIn1[w] & pIn2[w]);
-    else
-        for ( w = 0; w < nWords; w++ )
-            pOut[w] = pIn1[w] & pIn2[w];
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static inline int Abc_TtSuppIsMinBase( int Supp )
-{
-    return (Supp & (Supp+1)) == 0;
-}
-static inline int Abc_Tt6HasVar( word t, int iVar )
-{
-    static word Truth6[6] = {
-        0xAAAAAAAAAAAAAAAA,
-        0xCCCCCCCCCCCCCCCC,
-        0xF0F0F0F0F0F0F0F0,
-        0xFF00FF00FF00FF00,
-        0xFFFF0000FFFF0000,
-        0xFFFFFFFF00000000
-    };
-    return (t & ~Truth6[iVar]) != ((t & Truth6[iVar]) >> (1<<iVar));
-}
-static inline int Abc_TtHasVar( word * t, int nVars, int iVar )
-{
-    static word Truth6[6] = {
-        0xAAAAAAAAAAAAAAAA,
-        0xCCCCCCCCCCCCCCCC,
-        0xF0F0F0F0F0F0F0F0,
-        0xFF00FF00FF00FF00,
-        0xFFFF0000FFFF0000,
-        0xFFFFFFFF00000000
-    };
-    int nWords = Abc_TtWordNum( nVars );
-    assert( iVar < nVars );
-    if ( iVar < 6 )
-    {
-        int i, Shift = (1 << iVar);
-        for ( i = 0; i < nWords; i++ )
-            if ( (t[i] & ~Truth6[iVar]) != ((t[i] & Truth6[iVar]) >> Shift) )
-                return 1;
-        return 0;
-    }
-    else
-    {
-        int i, k, Step = (1 << (iVar - 6));
-        for ( k = 0; k < nWords; k += 2*Step )
-        {
-            for ( i = 0; i < Step; i++ )
-                if ( t[i] != t[Step+i] )
-                    return 1;
-            t += 2*Step;
-        }
-        return 0;
-    }
-}
-static inline int Abc_TtSupport( word * t, int nVars )
-{
-    int v, Supp = 0;
-    for ( v = 0; v < nVars; v++ )
-        if ( Abc_TtHasVar( t, nVars, v ) )
-            Supp |= (1 << v);
-    return Supp;
-}
-static inline int Abc_TtSupportSize( word * t, int nVars )
-{
-    int v, SuppSize = 0;
-    for ( v = 0; v < nVars; v++ )
-        if ( Abc_TtHasVar( t, nVars, v ) )
-            SuppSize++;
-    return SuppSize;
-}
-static inline int Abc_TtSupportAndSize( word * t, int nVars, int * pSuppSize )
-{
-    int v, Supp = 0;
-    *pSuppSize = 0;
-    for ( v = 0; v < nVars; v++ )
-        if ( Abc_TtHasVar( t, nVars, v ) )
-            Supp |= (1 << v), (*pSuppSize)++;
-    return Supp;
-}
-static inline int Abc_Tt6SupportAndSize( word t, int nVars, int * pSuppSize )
-{
-    int v, Supp = 0;
-    *pSuppSize = 0;
-    assert( nVars <= 6 );
-    for ( v = 0; v < nVars; v++ )
-        if ( Abc_Tt6HasVar( t, v ) )
-            Supp |= (1 << v), (*pSuppSize)++;
-    return Supp;
-}
-
-
-/**Function*************************************************************
-
-  Synopsis    []
-
-  Description []
-               
-  SideEffects []
-
-  SeeAlso     []
-
-***********************************************************************/
-static inline word Abc_Tt6SwapVars( word Truth, int iVar, int jVar )
-{
-    static word PPMasks[6][6] = {
-        { 0x2222222222222222, 0x0A0A0A0A0A0A0A0A, 0x00AA00AA00AA00AA, 0x0000AAAA0000AAAA, 0x00000000AAAAAAAA, 0xAAAAAAAAAAAAAAAA },
-        { 0x0000000000000000, 0x0C0C0C0C0C0C0C0C, 0x00CC00CC00CC00CC, 0x0000CCCC0000CCCC, 0x00000000CCCCCCCC, 0xCCCCCCCCCCCCCCCC },
-        { 0x0000000000000000, 0x0000000000000000, 0x00F000F000F000F0, 0x0000F0F00000F0F0, 0x00000000F0F0F0F0, 0xF0F0F0F0F0F0F0F0 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000FF000000FF00, 0x00000000FF00FF00, 0xFF00FF00FF00FF00 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x00000000FFFF0000, 0xFFFF0000FFFF0000 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0xFFFFFFFF00000000 }
-    };
-    int shift;
-    word low2High, high2Low; 
-    assert( iVar <= 5 && jVar <= 5 && iVar < jVar );
-    shift = (1 << jVar) - (1 << iVar);
-    low2High = (Truth & PPMasks[iVar][jVar - 1] ) << shift;
-    Truth &= ~PPMasks[iVar][jVar - 1];
-    high2Low = (Truth & (PPMasks[iVar][jVar - 1] << shift )) >> shift;
-    Truth &= ~(PPMasks[iVar][jVar - 1] << shift);
-    return Truth | low2High | high2Low;
-}
-
-static inline void Abc_TtSwapVars( word * pTruth, int nVars, int * V2P, int * P2V, int iVar, int jVar )
-{
-    word low2High, high2Low, temp;
-    int nWords = Abc_TtWordNum(nVars);
-    int shift, step, iStep, jStep;
-    int w = 0, i = 0, j = 0;
-    static word PPMasks[6][6] = {
-        { 0x2222222222222222, 0x0A0A0A0A0A0A0A0A, 0x00AA00AA00AA00AA, 0x0000AAAA0000AAAA, 0x00000000AAAAAAAA, 0xAAAAAAAAAAAAAAAA },
-        { 0x0000000000000000, 0x0C0C0C0C0C0C0C0C, 0x00CC00CC00CC00CC, 0x0000CCCC0000CCCC, 0x00000000CCCCCCCC, 0xCCCCCCCCCCCCCCCC },
-        { 0x0000000000000000, 0x0000000000000000, 0x00F000F000F000F0, 0x0000F0F00000F0F0, 0x00000000F0F0F0F0, 0xF0F0F0F0F0F0F0F0 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000FF000000FF00, 0x00000000FF00FF00, 0xFF00FF00FF00FF00 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x00000000FFFF0000, 0xFFFF0000FFFF0000 },
-        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0xFFFFFFFF00000000 }
-    };
-    if ( iVar == jVar )
-        return;
-    if ( jVar < iVar )
-    {
-        int varTemp = jVar;
-        jVar = iVar;
-        iVar = varTemp;
-    }
-    if ( iVar <= 5 && jVar <= 5 )
-    {
-        shift = (1 << jVar) - (1 << iVar);
-        for ( w = 0; w < nWords; w++ )
-        {
-            low2High = (pTruth[w] & PPMasks[iVar][jVar - 1] ) << shift;
-            pTruth[w] &= ~PPMasks[iVar][jVar - 1];
-            high2Low = (pTruth[w] & (PPMasks[iVar][jVar - 1] << shift )) >> shift;
-            pTruth[w] &= ~(PPMasks[iVar][jVar - 1] << shift);
-            pTruth[w] = pTruth[w] | low2High | high2Low;
-        }
-    }
-    else if ( iVar <= 5 && jVar > 5 )
-    {
-        step = Abc_TtWordNum(jVar + 1)/2;
-        shift = 1 << iVar;
-        for ( w = 0; w < nWords; w += 2*step )
-        {
-            for (j = 0; j < step; j++)
-            {
-                low2High = (pTruth[w + j] & PPMasks[iVar][5]) >> shift;
-                pTruth[w + j] &= ~PPMasks[iVar][5];
-                high2Low = (pTruth[w + step + j] & (PPMasks[iVar][5] >> shift)) << shift;
-                pTruth[w + step + j] &= ~(PPMasks[iVar][5] >> shift);
-                pTruth[w + j] |= high2Low;
-                pTruth[w + step + j] |= low2High;            
-            }
-        }
-    }
-    else
-    {
-        iStep = Abc_TtWordNum(iVar + 1)/2;
-        jStep = Abc_TtWordNum(jVar + 1)/2;
-        for (w = 0; w < nWords; w += 2*jStep)
-        {
-            for (i = 0; i < jStep; i += 2*iStep)
-            {
-                for (j = 0; j < iStep; j++)
-                {
-                    temp = pTruth[w + iStep + i + j];
-                    pTruth[w + iStep + i + j] = pTruth[w + jStep + i + j];
-                    pTruth[w + jStep + i + j] = temp;
-                }
-            }
-        }
-    }    
-    if ( V2P && P2V )
-    {
-        V2P[P2V[iVar]] = jVar;
-        V2P[P2V[jVar]] = iVar;
-        P2V[iVar] ^= P2V[jVar];
-        P2V[jVar] ^= P2V[iVar];
-        P2V[iVar] ^= P2V[jVar];
-    }
-}
-
-
 /**Function*************************************************************
 
   Synopsis    [Performs truth table computation.]
@@ -741,7 +487,7 @@ static inline int If_CutTruthMinimize6( If_Man_t * p, If_Cut_t * pCut )
         if ( k < i )
         {
             pCut->pLeaves[k] = pCut->pLeaves[i];
-            *If_CutTruthW(pCut) = Abc_Tt6SwapVars( *If_CutTruthW(pCut), k, i );
+            Abc_TtSwapVars( If_CutTruthW(pCut), pCut->nLimit, k, i );
         }
         k++;
     }
@@ -760,7 +506,7 @@ static inline word If_TruthStretch6( word Truth, If_Cut_t * pCut, If_Cut_t * pCu
             continue;
         assert( pCut0->pLeaves[k] == pCut->pLeaves[i] );
         if ( k < i )
-            Truth = Abc_Tt6SwapVars( Truth, k, i );
+            Abc_TtSwapVars( &Truth, pCut->nLimit, k, i );
         k--;
     }
     return Truth;
@@ -804,7 +550,7 @@ static inline int If_CutTruthMinimize21( If_Man_t * p, If_Cut_t * pCut )
         if ( k < i )
         {
             pCut->pLeaves[k] = pCut->pLeaves[i];
-            Abc_TtSwapVars( pTruth, nVars, NULL, NULL, k, i );
+            Abc_TtSwapVars( pTruth, nVars, k, i );
         }
         k++;
     }
@@ -848,7 +594,7 @@ static inline int If_CutTruthMinimize2( If_Man_t * p, If_Cut_t * pCut )
         if ( k < i )
         {
             pCut->pLeaves[k] = pCut->pLeaves[i];
-            Abc_TtSwapVars( If_CutTruthW(pCut), pCut->nLimit, NULL, NULL, k, i );
+            Abc_TtSwapVars( If_CutTruthW(pCut), pCut->nLimit, k, i );
         }
         k++;
     }
@@ -867,7 +613,7 @@ static inline void If_TruthStretch2( word * pTruth, If_Cut_t * pCut, If_Cut_t *
             continue;
         assert( pCut0->pLeaves[k] == pCut->pLeaves[i] );
         if ( k < i )
-            Abc_TtSwapVars( pTruth, pCut->nLimit, NULL, NULL, k, i );
+            Abc_TtSwapVars( pTruth, pCut->nLimit, k, i );
         k--;
     }
 }
diff --git a/src/misc/util/utilTruth.h b/src/misc/util/utilTruth.h
new file mode 100644
index 00000000..8ec4a513
--- /dev/null
+++ b/src/misc/util/utilTruth.h
@@ -0,0 +1,323 @@
+/**CFile****************************************************************
+
+  FileName    [utilTruth.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth table manipulation.]
+
+  Synopsis    [Truth table manipulation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - October 28, 2012.]
+
+  Revision    [$Id: utilTruth.h,v 1.00 2012/10/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef ABC__misc__util__utilTruth_h
+#define ABC__misc__util__utilTruth_h
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+ABC_NAMESPACE_HEADER_START
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+static word s_Truths6[6] = {
+    0xAAAAAAAAAAAAAAAA,
+    0xCCCCCCCCCCCCCCCC,
+    0xF0F0F0F0F0F0F0F0,
+    0xFF00FF00FF00FF00,
+    0xFFFF0000FFFF0000,
+    0xFFFFFFFF00000000
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int  Abc_TtWordNum( int nVars ) { return nVars <= 6 ? 1 : 1 << (nVars-6); }
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Abc_TtCopy( word * pOut, word * pIn, int nWords, int fCompl )
+{
+    int w;
+    if ( fCompl )
+        for ( w = 0; w < nWords; w++ )
+            pOut[w] = ~pIn[w];
+    else
+        for ( w = 0; w < nWords; w++ )
+            pOut[w] = pIn[w];
+}
+static inline void Abc_TtAnd( word * pOut, word * pIn1, word * pIn2, int nWords, int fCompl )
+{
+    int w;
+    if ( fCompl )
+        for ( w = 0; w < nWords; w++ )
+            pOut[w] = ~(pIn1[w] & pIn2[w]);
+    else
+        for ( w = 0; w < nWords; w++ )
+            pOut[w] = pIn1[w] & pIn2[w];
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Abc_TtSuppIsMinBase( int Supp )
+{
+    return (Supp & (Supp+1)) == 0;
+}
+static inline int Abc_Tt6HasVar( word t, int iVar )
+{
+    return (t & ~s_Truths6[iVar]) != ((t & s_Truths6[iVar]) >> (1<<iVar));
+}
+static inline int Abc_TtHasVar( word * t, int nVars, int iVar )
+{
+    int nWords = Abc_TtWordNum( nVars );
+    assert( iVar < nVars );
+    if ( iVar < 6 )
+    {
+        int i, Shift = (1 << iVar);
+        for ( i = 0; i < nWords; i++ )
+            if ( (t[i] & ~s_Truths6[iVar]) != ((t[i] & s_Truths6[iVar]) >> Shift) )
+                return 1;
+        return 0;
+    }
+    else
+    {
+        int i, k, Step = (1 << (iVar - 6));
+        for ( k = 0; k < nWords; k += 2*Step, t += 2*Step )
+            for ( i = 0; i < Step; i++ )
+                if ( t[i] != t[Step+i] )
+                    return 1;
+        return 0;
+    }
+}
+static inline int Abc_TtSupport( word * t, int nVars )
+{
+    int v, Supp = 0;
+    for ( v = 0; v < nVars; v++ )
+        if ( Abc_TtHasVar( t, nVars, v ) )
+            Supp |= (1 << v);
+    return Supp;
+}
+static inline int Abc_TtSupportSize( word * t, int nVars )
+{
+    int v, SuppSize = 0;
+    for ( v = 0; v < nVars; v++ )
+        if ( Abc_TtHasVar( t, nVars, v ) )
+            SuppSize++;
+    return SuppSize;
+}
+static inline int Abc_TtSupportAndSize( word * t, int nVars, int * pSuppSize )
+{
+    int v, Supp = 0;
+    *pSuppSize = 0;
+    for ( v = 0; v < nVars; v++ )
+        if ( Abc_TtHasVar( t, nVars, v ) )
+            Supp |= (1 << v), (*pSuppSize)++;
+    return Supp;
+}
+static inline int Abc_Tt6SupportAndSize( word t, int nVars, int * pSuppSize )
+{
+    int v, Supp = 0;
+    *pSuppSize = 0;
+    assert( nVars <= 6 );
+    for ( v = 0; v < nVars; v++ )
+        if ( Abc_Tt6HasVar( t, v ) )
+            Supp |= (1 << v), (*pSuppSize)++;
+    return Supp;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Abc_TtSwapVars( word * pTruth, int nVars, int iVar, int jVar )
+{
+    static word PPMasks[6][6] = {
+        { 0x2222222222222222, 0x0A0A0A0A0A0A0A0A, 0x00AA00AA00AA00AA, 0x0000AAAA0000AAAA, 0x00000000AAAAAAAA, 0xAAAAAAAAAAAAAAAA },
+        { 0x0000000000000000, 0x0C0C0C0C0C0C0C0C, 0x00CC00CC00CC00CC, 0x0000CCCC0000CCCC, 0x00000000CCCCCCCC, 0xCCCCCCCCCCCCCCCC },
+        { 0x0000000000000000, 0x0000000000000000, 0x00F000F000F000F0, 0x0000F0F00000F0F0, 0x00000000F0F0F0F0, 0xF0F0F0F0F0F0F0F0 },
+        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000FF000000FF00, 0x00000000FF00FF00, 0xFF00FF00FF00FF00 },
+        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x00000000FFFF0000, 0xFFFF0000FFFF0000 },
+        { 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0xFFFFFFFF00000000 }
+    };
+    if ( nVars <= 6 )
+    {
+        int shift;
+        word low2High, high2Low; 
+        assert( iVar <= 5 && jVar <= 5 && iVar < jVar );
+        shift = (1 << jVar) - (1 << iVar);
+        low2High = (pTruth[0] & PPMasks[iVar][jVar - 1] ) << shift;
+        pTruth[0] &= ~PPMasks[iVar][jVar - 1];
+        high2Low = (pTruth[0] & (PPMasks[iVar][jVar - 1] << shift )) >> shift;
+        pTruth[0] &= ~(PPMasks[iVar][jVar - 1] << shift);
+        pTruth[0] |= low2High | high2Low;
+    }
+    else
+    {
+        word low2High, high2Low, temp;
+        int nWords = Abc_TtWordNum(nVars);
+        int shift, step, iStep, jStep;
+        int w = 0, i = 0, j = 0;
+        if ( iVar == jVar )
+            return;
+        if ( jVar < iVar )
+            ABC_SWAP( int, iVar, jVar );
+        if ( iVar <= 5 && jVar <= 5 )
+        {
+            shift = (1 << jVar) - (1 << iVar);
+            for ( w = 0; w < nWords; w++ )
+            {
+                low2High = (pTruth[w] & PPMasks[iVar][jVar - 1] ) << shift;
+                pTruth[w] &= ~PPMasks[iVar][jVar - 1];
+                high2Low = (pTruth[w] & (PPMasks[iVar][jVar - 1] << shift )) >> shift;
+                pTruth[w] &= ~(PPMasks[iVar][jVar - 1] << shift);
+                pTruth[w] |= low2High | high2Low;
+            }
+        }
+        else if ( iVar <= 5 && jVar > 5 )
+        {
+            step = Abc_TtWordNum(jVar + 1)/2;
+            shift = 1 << iVar;
+            for ( w = 0; w < nWords; w += 2*step )
+            {
+                for (j = 0; j < step; j++)
+                {
+                    low2High = (pTruth[w + j] & PPMasks[iVar][5]) >> shift;
+                    pTruth[w + j] &= ~PPMasks[iVar][5];
+                    high2Low = (pTruth[w + step + j] & (PPMasks[iVar][5] >> shift)) << shift;
+                    pTruth[w + step + j] &= ~(PPMasks[iVar][5] >> shift);
+                    pTruth[w + j] |= high2Low;
+                    pTruth[w + step + j] |= low2High;            
+                }
+            }
+        }
+        else
+        {
+            iStep = Abc_TtWordNum(iVar + 1)/2;
+            jStep = Abc_TtWordNum(jVar + 1)/2;
+            for (w = 0; w < nWords; w += 2*jStep)
+            {
+                for (i = 0; i < jStep; i += 2*iStep)
+                {
+                    for (j = 0; j < iStep; j++)
+                    {
+                        temp = pTruth[w + iStep + i + j];
+                        pTruth[w + iStep + i + j] = pTruth[w + jStep + i + j];
+                        pTruth[w + jStep + i + j] = temp;
+                    }
+                }
+            }
+        }    
+    }
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Stretch truthtable to have more input variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static void Abc_TtStretch5( unsigned * pInOut, int nVarS, int nVarB )
+{
+    int w, i, step, nWords;
+    if ( nVarS == nVarB )
+        return;
+    assert( nVarS < nVarB );
+    step = Abc_TruthWordNum(nVarS);
+    nWords = Abc_TruthWordNum(nVarB);
+    if ( step == nWords )
+        return;
+    assert( step < nWords );
+    for ( w = 0; w < nWords; w += step )
+        for ( i = 0; i < step; i++ )
+            pInOut[w + i] = pInOut[i];              
+}
+static void Abc_TtStretch6( word * pInOut, int nVarS, int nVarB )
+{
+    int w, i, step, nWords;
+    if ( nVarS == nVarB )
+        return;
+    assert( nVarS < nVarB );
+    step = Abc_Truth6WordNum(nVarS);
+    nWords = Abc_Truth6WordNum(nVarB);
+    if ( step == nWords )
+        return;
+    assert( step < nWords );
+    for ( w = 0; w < nWords; w += step )
+        for ( i = 0; i < step; i++ )
+            pInOut[w + i] = pInOut[i];              
+}
+
+/*=== utilTruth.c ===========================================================*/
+
+
+ABC_NAMESPACE_HEADER_END
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////