Added a new demitering feature for dual-output miters.

src/aig/aig/aig.h

@@ -557,6 +557,7 @@ extern void            Aig_ObjConnect( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_
 extern void            Aig_ObjDisconnect( Aig_Man_t * p, Aig_Obj_t * pObj );
 extern void            Aig_ObjDelete( Aig_Man_t * p, Aig_Obj_t * pObj );
 extern void            Aig_ObjDelete_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int fFreeTop );
+extern void            Aig_ObjDeletePo( Aig_Man_t * p, Aig_Obj_t * pObj );
 extern void            Aig_ObjPrint( Aig_Man_t * p, Aig_Obj_t * pObj );
 extern void            Aig_ObjPatchFanin0( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFaninNew );
 extern void            Aig_ObjReplace( Aig_Man_t * p, Aig_Obj_t * pObjOld, Aig_Obj_t * pObjNew, int fUpdateLevel );

src/aig/aig/aigObj.c

@@ -268,6 +268,27 @@ void Aig_ObjDelete_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int fFreeTop )
 
 /**Function*************************************************************
 
+  Synopsis    [Deletes the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjDeletePo( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( Aig_ObjIsPo(pObj) );
+    Aig_ObjDeref(Aig_ObjFanin0(pObj));
+    pObj->pFanin0 = NULL;
+    p->nObjs[pObj->Type]--;
+    Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+    Aig_ManRecycleMemory( p, pObj );
+}
+
+/**Function*************************************************************
+
   Synopsis    [Replaces the first fanin of the node by the new fanin.]
 
   Description []

src/aig/saig/saig.h

@@ -168,6 +168,7 @@ extern Aig_Man_t *       Saig_ManDualRail( Aig_Man_t * p, int fMiter );
 extern Aig_Man_t *       Saig_ManCreateMiterTwo( Aig_Man_t * pOld, Aig_Man_t * pNew, int nFrames );
 extern int               Saig_ManDemiterSimple( Aig_Man_t * p, Aig_Man_t ** ppAig0, Aig_Man_t ** ppAig1 );
 extern int               Saig_ManDemiterSimpleDiff( Aig_Man_t * p, Aig_Man_t ** ppAig0, Aig_Man_t ** ppAig1 );
+extern int               Saig_ManDemiterDual( Aig_Man_t * p, Aig_Man_t ** ppAig0, Aig_Man_t ** ppAig1 );
 extern int               Ssw_SecSpecialMiter( Aig_Man_t * p0, Aig_Man_t * p1, int nFrames, int fVerbose );
 /*=== saigOutdec.c ==========================================================*/
 extern Aig_Man_t *       Saig_ManDecPropertyOutput( Aig_Man_t * pAig, int nLits, int fVerbose );

src/aig/saig/saigMiter.c

@@ -696,6 +696,63 @@ int Saig_ManDemiterSimpleDiff( Aig_Man_t * p, Aig_Man_t ** ppAig0, Aig_Man_t **
 
 /**Function*************************************************************
 
+  Synopsis    [Returns 1 if AIG can be demitered.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Saig_ManDemiterDual( Aig_Man_t * p, Aig_Man_t ** ppAig0, Aig_Man_t ** ppAig1 )
+{
+    Aig_Man_t * pTemp;
+    Aig_Obj_t * pObj;
+    int i, k;
+
+    if ( p->pFanData )
+        Aig_ManFanoutStop( p );
+
+    k = 0;
+    pTemp = Aig_ManDupSimple( p );
+    Saig_ManForEachPo( pTemp, pObj, i )
+    {
+        if ( i & 1 )
+            Aig_ObjDeletePo( pTemp, pObj );
+        else
+            Vec_PtrWriteEntry( pTemp->vPos, k++, pObj );
+    }
+    Saig_ManForEachLi( pTemp, pObj, i )
+        Vec_PtrWriteEntry( pTemp->vPos, k++, pObj );
+    Vec_PtrShrink( pTemp->vPos, k );
+    pTemp->nTruePos = k - Saig_ManRegNum(pTemp);
+    Aig_ManSeqCleanup( pTemp );
+    *ppAig0 = Aig_ManDupSimple( pTemp );
+    Aig_ManStop( pTemp );
+
+    k = 0;
+    pTemp = Aig_ManDupSimple( p );
+    Saig_ManForEachPo( pTemp, pObj, i )
+    {
+        if ( i & 1 )
+            Vec_PtrWriteEntry( pTemp->vPos, k++, pObj );
+        else
+            Aig_ObjDeletePo( pTemp, pObj );
+    }
+    Saig_ManForEachLi( pTemp, pObj, i )
+        Vec_PtrWriteEntry( pTemp->vPos, k++, pObj );
+    Vec_PtrShrink( pTemp->vPos, k );
+    pTemp->nTruePos = k - Saig_ManRegNum(pTemp);
+    Aig_ManSeqCleanup( pTemp );
+    *ppAig1 = Aig_ManDupSimple( pTemp );
+    Aig_ManStop( pTemp );
+
+    return 1;
+}
+
+/**Function*************************************************************
+
   Synopsis    [Duplicates the AIG to have constant-0 initial state.]
 
   Description []

src/base/abci/abc.c

@@ -5513,21 +5513,30 @@ usage:
 int Abc_CommandDemiter( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
     Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);//, * pNtkRes;
-    int fSeq;
+    int fDual, fSeq, fVerbose;
     int c;
     extern int Abc_NtkDemiter( Abc_Ntk_t * pNtk );
     extern int Abc_NtkDarDemiter( Abc_Ntk_t * pNtk );
+    extern int Abc_NtkDarDemiterDual( Abc_Ntk_t * pNtk, int fVerbose );
 
     // set defaults
+    fDual = 0;
     fSeq = 1;
+    fVerbose = 1;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "sh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "dsvh" ) ) != EOF )
     {
         switch ( c )
         {
+        case 'd':
+            fDual ^= 1;
+            break;
         case 's':
             fSeq ^= 1;
             break;
+        case 'v':
+            fVerbose ^= 1;
+            break;
         default:
             goto usage;
         }
@@ -5545,6 +5554,22 @@ int Abc_CommandDemiter( Abc_Frame_t * pAbc, int argc, char ** argv )
         return 1;
     }
 
+    if ( (Abc_NtkPoNum(pNtk) & 1) )
+    {
+        Abc_Print( -1, "The number of POs should be even.\n" );
+        return 0;
+    }
+
+    if ( fDual )
+    {
+        if ( !Abc_NtkDarDemiterDual( pNtk, fVerbose ) )
+        {
+            Abc_Print( -1, "Demitering has failed.\n" );
+            return 1;
+        }
+        return 0;
+    }
+
     // get the new network
     if ( fSeq )
     {
@@ -5577,9 +5602,11 @@ int Abc_CommandDemiter( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: demiter [-sh]\n" );
-    Abc_Print( -2, "\t        removes topmost EXOR from the miter to create two POs\n" );
-    Abc_Print( -2, "\t-s    : applied multi-output algorithm [default = %s]\n", fSeq? "yes": "no" );
+    Abc_Print( -2, "usage: demiter [-dsvh]\n" );
+    Abc_Print( -2, "\t        removes topmost XOR from the miter to create two POs\n" );
+    Abc_Print( -2, "\t-d    : demiters a dual-output miter (without XORs) [default = %s]\n", fSeq? "yes": "no" );
+    Abc_Print( -2, "\t-s    : applies a multi-output algorithm [default = %s]\n", fSeq? "yes": "no" );
+    Abc_Print( -2, "\t-v    : toggles outputting verbose information [default = %s]\n", fVerbose? "yes": "no" );  
     Abc_Print( -2, "\t-h    : print the command usage\n");
     return 1;
 }

src/base/abci/abcDar.c

@@ -2051,6 +2051,74 @@ int Abc_NtkDarDemiter( Abc_Ntk_t * pNtk )
     Aig_ManStop( pMan );
     return 1;
 } 
+
+/**Function*************************************************************
+
+  Synopsis    [Gives the current ABC network to AIG manager for processing.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NtkDarDemiterDual( Abc_Ntk_t * pNtk, int fVerbose )
+{ 
+    char * pFileNameGeneric, pFileName0[1000], pFileName1[1000];
+    Aig_Man_t * pMan, * pPart0, * pPart1;//, * pMiter;
+    if ( (Abc_NtkPoNum(pNtk) & 1) )
+    {
+        printf( "The number of POs should be even.\n" );
+        return 0;
+    }
+    // derive the AIG manager
+    pMan = Abc_NtkToDar( pNtk, 0, 1 );
+    if ( pMan == NULL )
+    {
+        printf( "Converting network into AIG has failed.\n" );
+        return 0;
+    }
+//    if ( !Saig_ManDemiterSimple( pMan, &pPart0, &pPart1 ) )
+    if ( !Saig_ManDemiterDual( pMan, &pPart0, &pPart1 ) )
+    {
+        printf( "Demitering has failed.\n" );
+        return 0;
+    }
+    // create new AIG
+    ABC_FREE( pPart0->pName );
+    pPart0->pName = Aig_UtilStrsav( "part0" );
+    // create new AIGs
+    ABC_FREE( pPart1->pName );
+    pPart1->pName = Aig_UtilStrsav( "part1" );
+    // create file names
+    pFileNameGeneric = Extra_FileNameGeneric( pNtk->pSpec );
+    sprintf( pFileName0,  "%s%s",  pFileNameGeneric, "_part0.aig" ); 
+    sprintf( pFileName1,  "%s%s",  pFileNameGeneric, "_part1.aig" ); 
+    ABC_FREE( pFileNameGeneric );
+    Ioa_WriteAiger( pPart0, pFileName0, 0, 0 );
+    Ioa_WriteAiger( pPart1, pFileName1, 0, 0 );
+    printf( "Demitering produced two files \"%s\" and \"%s\".\n", pFileName0, pFileName1 );
+    // dump files
+    if ( fVerbose )
+    {
+//        printf( "Init:  " );
+        Aig_ManPrintStats( pMan );
+//        printf( "Part1: " );
+        Aig_ManPrintStats( pPart0 );
+//        printf( "Part2: " );
+        Aig_ManPrintStats( pPart1 );
+    }
+    // create two-level miter
+//    pMiter = Saig_ManCreateMiterTwo( pPart0, pPart1, 2 );
+//    Aig_ManDumpBlif( pMiter, "miter01.blif", NULL, NULL );
+//    Aig_ManStop( pMiter );
+//    printf( "The new miter is written into file \"%s\".\n", "miter01.blif" );
+    Aig_ManStop( pPart0 );
+    Aig_ManStop( pPart1 );
+    Aig_ManStop( pMan );
+    return 1;
+} 
  
 /**Function*************************************************************