Adding print-out to &splitprove to see impact of cof variable on AIG size.

src/base/abc/abc.h

@@ -795,7 +795,7 @@ extern ABC_DLL float              Abc_NtkMfsTotalSwitching( Abc_Ntk_t * pNtk );
 extern ABC_DLL void               Abc_NtkPrintStats( Abc_Ntk_t * pNtk, int fFactored, int fSaveBest, int fDumpResult, int fUseLutLib, int fPrintMuxes, int fPower, int fGlitch, int fSkipBuf );
 extern ABC_DLL void               Abc_NtkPrintIo( FILE * pFile, Abc_Ntk_t * pNtk, int fPrintFlops );
 extern ABC_DLL void               Abc_NtkPrintLatch( FILE * pFile, Abc_Ntk_t * pNtk );
-extern ABC_DLL void               Abc_NtkPrintFanio( FILE * pFile, Abc_Ntk_t * pNtk );
+extern ABC_DLL void               Abc_NtkPrintFanio( FILE * pFile, Abc_Ntk_t * pNtk, int fUsePis );
 extern ABC_DLL void               Abc_NtkPrintFanioNew( FILE * pFile, Abc_Ntk_t * pNtk, int fMffc );
 extern ABC_DLL void               Abc_NodePrintFanio( FILE * pFile, Abc_Obj_t * pNode );
 extern ABC_DLL void               Abc_NtkPrintFactor( FILE * pFile, Abc_Ntk_t * pNtk, int fUseRealNames );

src/base/abci/abc.c

@@ -1407,17 +1407,17 @@ int Abc_CommandPrintFanio( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
     Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
     int c;
-    int fMffc;
-    int fVerbose;
-
-    // set defaults
-    fMffc    = 0;
-    fVerbose = 0;
+    int fUsePis   = 0;
+    int fMffc     = 0;
+    int fVerbose  = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "mvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "imvh" ) ) != EOF )
     {
         switch ( c )
         {
+        case 'i':
+            fUsePis ^= 1;
+            break;
         case 'm':
             fMffc ^= 1;
             break;
@@ -1430,23 +1430,22 @@ int Abc_CommandPrintFanio( Abc_Frame_t * pAbc, int argc, char ** argv )
             goto usage;
         }
     }
-
     if ( pNtk == NULL )
     {
         Abc_Print( -1, "Empty network.\n" );
         return 1;
     }
-
     // print the nodes
     if ( fVerbose )
-        Abc_NtkPrintFanio( stdout, pNtk );
+        Abc_NtkPrintFanio( stdout, pNtk, fUsePis );
     else
         Abc_NtkPrintFanioNew( stdout, pNtk, fMffc );
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: print_fanio [-mvh]\n" );
+    Abc_Print( -2, "usage: print_fanio [-imvh]\n" );
     Abc_Print( -2, "\t        prints the statistics about fanins/fanouts of all nodes\n" );
+    Abc_Print( -2, "\t-i    : toggles considering fanouts of primary inputs only [default = %s]\n", fUsePis? "yes": "no" );
     Abc_Print( -2, "\t-m    : toggles printing MFFC sizes instead of fanouts [default = %s]\n", fMffc? "yes": "no" );
     Abc_Print( -2, "\t-v    : toggles verbose way of printing the stats [default = %s]\n", fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h    : print the command usage\n");

src/base/abci/abcPrint.c

@@ -524,7 +524,7 @@ void Abc_NtkPrintLatch( FILE * pFile, Abc_Ntk_t * pNtk )
   SeeAlso     []
 
 ***********************************************************************/
-void Abc_NtkPrintFanio( FILE * pFile, Abc_Ntk_t * pNtk )
+void Abc_NtkPrintFanio( FILE * pFile, Abc_Ntk_t * pNtk, int fUsePis )
 {
     Abc_Obj_t * pNode;
     int i, k, nFanins, nFanouts;
@@ -558,6 +558,18 @@ void Abc_NtkPrintFanio( FILE * pFile, Abc_Ntk_t * pNtk )
         vFanins->pArray[nFanins]++;
         vFanouts->pArray[nFanouts]++;
     }
+    if ( fUsePis )
+    {
+        Vec_IntFill( vFanouts, Vec_IntSize(vFanouts), 0 );
+        Abc_NtkForEachCi( pNtk, pNode, i )
+        {
+            if ( Abc_NtkIsNetlist(pNtk) )
+                nFanouts = Abc_ObjFanoutNum( Abc_ObjFanout0(pNode) );
+            else
+                nFanouts = Abc_ObjFanoutNum(pNode);
+            vFanouts->pArray[nFanouts]++;
+        }
+    }
     fprintf( pFile, "The distribution of fanins and fanouts in the network:\n" );
     fprintf( pFile, "  Number   Nodes with fanin  Nodes with fanout\n" );
     for ( k = 0; k < vFanins->nSize; k++ )

src/proof/cec/cecSplit.c

@@ -203,7 +203,7 @@ Gia_Man_t * Gia_PermuteSpecial( Gia_Man_t * p )
   SeeAlso     []
 
 ***********************************************************************/
-int Gia_SplitCofVar2( Gia_Man_t * p )
+int Gia_SplitCofVar2( Gia_Man_t * p, int * pnFanouts, int * pnCost )
 {
     Gia_Obj_t * pObj;
     int i, iBest = -1, CostBest = -1;
@@ -213,15 +213,17 @@ int Gia_SplitCofVar2( Gia_Man_t * p )
         if ( CostBest < Gia_ObjRefNum(p, pObj) )
             iBest = i, CostBest = Gia_ObjRefNum(p, pObj);
     assert( iBest >= 0 );
+    *pnFanouts = Gia_ObjRefNum(p, Gia_ManPi(p, iBest));
+    *pnCost = -1;
     return iBest;
 }
-int Gia_SplitCofVar( Gia_Man_t * p, int LookAhead )
+int Gia_SplitCofVar( Gia_Man_t * p, int LookAhead, int * pnFanouts, int * pnCost )
 {
     Gia_Man_t * pPart;
     int Cost0, Cost1, CostBest = ABC_INFINITY;
     int * pOrder, i, iBest = -1;
     if ( LookAhead == 1 )
-        return Gia_SplitCofVar2( p );
+        return Gia_SplitCofVar2( p, pnFanouts, pnCost );
     pOrder = Gia_PermuteSpecialOrder( p );
     LookAhead = Abc_MinInt( LookAhead, Gia_ManPiNum(p) );
     for ( i = 0; i < LookAhead; i++ )
@@ -251,6 +253,8 @@ int Gia_SplitCofVar( Gia_Man_t * p, int LookAhead )
     }
     ABC_FREE( pOrder );
     assert( iBest >= 0 );
+    *pnFanouts = Gia_ObjRefNum(p, Gia_ManPi(p, iBest));
+    *pnCost = CostBest;
     return iBest;
 }
 
@@ -428,11 +432,19 @@ int Cec_GiaSplitTest2( Gia_Man_t * p, int nProcs, int nTimeOut, int nIterMax, in
         Gia_Man_t * pLast = (Gia_Man_t *)Vec_PtrPop( vStack );
         // determine cofactoring variable
         int Depth = 1 + (pLast->vCofVars ? Vec_IntSize(pLast->vCofVars) : 0);
-        int iVar  = Gia_SplitCofVar( pLast, LookAhead );
+        int nFanouts, Cost, iVar  = Gia_SplitCofVar( pLast, LookAhead, &nFanouts, &Cost );
         // cofactor
         Gia_Man_t * pPart = Gia_ManDupCofactor( pLast, iVar, 0 );
         if ( pLast->vCofVars == NULL )
             pLast->vCofVars = Vec_IntAlloc( 100 );
+        // print results
+        if ( fVerbose )
+        {
+//            Cec_GiaSplitPrintRefs( pLast );
+            printf( "Var = %5d. Fanouts = %5d. Cost = %8d.  AndBefore = %6d.  AndAfter = %6d.\n", 
+                iVar, nFanouts, Cost, Gia_ManAndNum(pLast), Gia_ManAndNum(pPart) );
+//            Cec_GiaSplitPrintRefs( pPart );
+        }
         // create variable
         pPart->vCofVars = Vec_IntAlloc( Vec_IntSize(pLast->vCofVars) + 1 );
         Vec_IntAppend( pPart->vCofVars, pLast->vCofVars );
@@ -630,13 +642,21 @@ int Cec_GiaSplitTest( Gia_Man_t * p, int nProcs, int nTimeOut, int nIterMax, int
                 if ( ThData[i].Result == -1 ) // UNDEC
                 {
                     // determine cofactoring variable
-                    int iVar = Gia_SplitCofVar( pLast, LookAhead );
+                    int nFanouts, Cost, iVar = Gia_SplitCofVar( pLast, LookAhead, &nFanouts, &Cost );
                     // cofactor
                     Gia_Man_t * pPart = Gia_ManDupCofactor( pLast, iVar, 0 );
                     pPart->vCofVars = Vec_IntAlloc( Vec_IntSize(pLast->vCofVars) + 1 );
                     Vec_IntAppend( pPart->vCofVars, pLast->vCofVars );
                     Vec_IntPush( pPart->vCofVars, Abc_Var2Lit(iVar, 1) );
                     Vec_PtrPush( vStack, pPart );
+                    // print results
+                    if ( fVerbose )
+                    {
+//                        Cec_GiaSplitPrintRefs( pLast );
+                        printf( "Var = %5d. Fanouts = %5d. Cost = %8d.  AndBefore = %6d.  AndAfter = %6d.\n", 
+                            iVar, nFanouts, Cost, Gia_ManAndNum(pLast), Gia_ManAndNum(pPart) );
+//                        Cec_GiaSplitPrintRefs( pPart );
+                    }
                     // cofactor
                     pPart = Gia_ManDupCofactor( pLast, iVar, 1 );
                     pPart->vCofVars = Vec_IntAlloc( Vec_IntSize(pLast->vCofVars) + 1 );