Adding switch &mfs -b to preserve white boxes during optimization.

src/aig/gia/giaMfs.c

@@ -239,7 +239,7 @@ Sfm_Ntk_t * Gia_ManExtractMfs( Gia_Man_t * p )
   SeeAlso     []
 
 ***********************************************************************/
-Gia_Man_t * Gia_ManInsertMfs( Gia_Man_t * p, Sfm_Ntk_t * pNtk )
+Gia_Man_t * Gia_ManInsertMfs( Gia_Man_t * p, Sfm_Ntk_t * pNtk, int fAllBoxes )
 {
     extern int Gia_ManFromIfLogicCreateLut( Gia_Man_t * pNew, word * pRes, Vec_Int_t * vLeaves, Vec_Int_t * vCover, Vec_Int_t * vMapping, Vec_Int_t * vMapping2 );
     Gia_Man_t * pNew;  Gia_Obj_t * pObj;
@@ -294,7 +294,7 @@ Gia_Man_t * Gia_ManInsertMfs( Gia_Man_t * p, Sfm_Ntk_t * pNtk )
 
     // collect nodes in the given order
     vBoxesLeft = Vec_IntAlloc( nBoxes );
-    vMfsTopo = Sfm_NtkDfs( pNtk, vGroups, vGroupMap, vBoxesLeft );
+    vMfsTopo = Sfm_NtkDfs( pNtk, vGroups, vGroupMap, vBoxesLeft, fAllBoxes );
     assert( Vec_IntSize(vBoxesLeft) <= nBoxes );
     assert( Vec_IntSize(vMfsTopo) > 0 );
 
@@ -458,7 +458,7 @@ Gia_Man_t * Gia_ManPerformMfs( Gia_Man_t * p, Sfm_Par_t * pPars )
     }
     else
     {
-        pNew = Gia_ManInsertMfs( p, pNtk );
+        pNew = Gia_ManInsertMfs( p, pNtk, pPars->fAllBoxes );
         if( pPars->fVerbose )
             Abc_Print( 1, "The network has %d nodes changed by \"&mfs\".\n", nNodes );
         // check integrity

src/base/abci/abc.c

@@ -40612,7 +40612,7 @@ int Abc_CommandAbc9Mfs( Abc_Frame_t * pAbc, int argc, char ** argv )
     pPars->nDepthMax   =  100;
     pPars->nWinSizeMax = 2000; 
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "WFDMLCNdaevwh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "WFDMLCNdaebvwh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -40702,6 +40702,9 @@ int Abc_CommandAbc9Mfs( Abc_Frame_t * pAbc, int argc, char ** argv )
         case 'e':
             pPars->fMoreEffort ^= 1;
             break;
+        case 'b':
+            pPars->fAllBoxes ^= 1;
+            break;
         case 'v':
             pPars->fVerbose ^= 1;
             break;
@@ -40734,7 +40737,7 @@ int Abc_CommandAbc9Mfs( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: &mfs [-WFDMLCN <num>] [-daevwh]\n" );
+    Abc_Print( -2, "usage: &mfs [-WFDMLCN <num>] [-daebvwh]\n" );
     Abc_Print( -2, "\t           performs don't-care-based optimization of logic networks\n" );
     Abc_Print( -2, "\t-W <num> : the number of levels in the TFO cone (0 <= num) [default = %d]\n",             pPars->nTfoLevMax );
     Abc_Print( -2, "\t-F <num> : the max number of fanouts to skip (1 <= num) [default = %d]\n",                pPars->nFanoutMax );
@@ -40746,6 +40749,7 @@ usage:
     Abc_Print( -2, "\t-d       : toggle performing redundancy removal [default = %s]\n",                        pPars->fRrOnly? "yes": "no" );
     Abc_Print( -2, "\t-a       : toggle minimizing area or area+edges [default = %s]\n",                        pPars->fArea? "area": "area+edges" );
     Abc_Print( -2, "\t-e       : toggle high-effort resubstitution [default = %s]\n",                           pPars->fMoreEffort? "yes": "no" );
+    Abc_Print( -2, "\t-b       : toggle preserving all while boxes [default = %s]\n",                           pPars->fAllBoxes? "yes": "no" );
     Abc_Print( -2, "\t-v       : toggle printing optimization summary [default = %s]\n",                        pPars->fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-w       : toggle printing detailed stats for each node [default = %s]\n",                pPars->fVeryVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h       : print the command usage\n");

src/opt/sfm/sfm.h

@@ -67,6 +67,7 @@ struct Sfm_Par_t_
     int             fZeroCost;     // enable zero-cost replacement
     int             fUseSim;       // enable simulation
     int             fPrintDecs;    // enable printing decompositions
+    int             fAllBoxes;     // enable preserving all boxes
     int             fLibVerbose;   // enable library stats
     int             fDelayVerbose; // enable delay stats
     int             fVerbose;      // enable basic stats
@@ -93,7 +94,7 @@ extern word *       Sfm_NodeReadTruth( Sfm_Ntk_t * p, int i );
 extern int          Sfm_NodeReadFixed( Sfm_Ntk_t * p, int i );
 extern int          Sfm_NodeReadUsed( Sfm_Ntk_t * p, int i );
 /*=== sfmWin.c ==========================================================*/
-extern Vec_Int_t *  Sfm_NtkDfs( Sfm_Ntk_t * p, Vec_Wec_t * vGroups, Vec_Int_t * vGroupMap, Vec_Int_t * vBoxesLeft );
+extern Vec_Int_t *  Sfm_NtkDfs( Sfm_Ntk_t * p, Vec_Wec_t * vGroups, Vec_Int_t * vGroupMap, Vec_Int_t * vBoxesLeft, int fAllBoxes );
 
 
 ABC_NAMESPACE_HEADER_END

src/opt/sfm/sfmCore.c

@@ -54,6 +54,7 @@ void Sfm_ParSetDefault( Sfm_Par_t * pPars )
     pPars->fRrOnly      =    0;  // perform redundancy removal
     pPars->fArea        =    0;  // performs optimization for area
     pPars->fMoreEffort  =    0;  // performs high-affort minimization
+    pPars->fAllBoxes    =    0;  // enable preserving all boxes
     pPars->fVerbose     =    0;  // enable basic stats
     pPars->fVeryVerbose =    0;  // enable detailed stats
 }

src/opt/sfm/sfmWin.c

@@ -163,13 +163,19 @@ void Sfm_NtkDfs_rec( Sfm_Ntk_t * p, int iNode, Vec_Int_t * vNodes, Vec_Wec_t * v
         Vec_IntPush( vNodes, iNode );
     }
 }
-Vec_Int_t * Sfm_NtkDfs( Sfm_Ntk_t * p, Vec_Wec_t * vGroups, Vec_Int_t * vGroupMap, Vec_Int_t * vBoxesLeft )
+Vec_Int_t * Sfm_NtkDfs( Sfm_Ntk_t * p, Vec_Wec_t * vGroups, Vec_Int_t * vGroupMap, Vec_Int_t * vBoxesLeft, int fAllBoxes )
 {
     Vec_Int_t * vNodes;
     int i;
     Vec_IntClear( vBoxesLeft );
     vNodes = Vec_IntAlloc( p->nObjs );
     Sfm_NtkIncrementTravId( p );
+    if ( fAllBoxes )
+    {
+        Vec_Int_t * vGroup;
+        Vec_WecForEachLevel( vGroups, vGroup, i )
+            Sfm_NtkDfs_rec( p, Vec_IntEntry(vGroup, 0), vNodes, vGroups, vGroupMap, vBoxesLeft );
+    }
     Sfm_NtkForEachPo( p, i )
         Sfm_NtkDfs_rec( p, Sfm_ObjFanin(p, i, 0), vNodes, vGroups, vGroupMap, vBoxesLeft );
     return vNodes;