summaryrefslogtreecommitdiffstats
path: root/src/base/abci/abcMiter.c
blob: a054a47403ec6f294dd2090768b2906420a05e84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
/**CFile****************************************************************

  FileName    [abcMiter.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Procedures to derive the miter of two circuits.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - June 20, 2005.]

  Revision    [$Id: abcMiter.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]

***********************************************************************/

#include "abc.h"

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

static Abc_Ntk_t * Abc_NtkMiterInt( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fComb, int nPartSize );
static void        Abc_NtkMiterPrepare( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, Abc_Ntk_t * pNtkMiter, int fComb, int nPartSize );
static void        Abc_NtkMiterAddOne( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkMiter );
static void        Abc_NtkMiterFinalize( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, Abc_Ntk_t * pNtkMiter, int fComb, int nPartSize );
static void        Abc_NtkAddFrame( Abc_Ntk_t * pNetNew, Abc_Ntk_t * pNet, int iFrame );

// to be exported 
typedef void (*AddFrameMapping)( Abc_Obj_t*, Abc_Obj_t*, int, void*);
extern Abc_Ntk_t * Abc_NtkFrames2( Abc_Ntk_t * pNtk, int nFrames, int fInitial, AddFrameMapping addFrameMapping, void* arg );
static void        Abc_NtkAddFrame2( Abc_Ntk_t * pNtkFrames, Abc_Ntk_t * pNtk, int iFrame, Vec_Ptr_t * vNodes, AddFrameMapping addFrameMapping, void* arg );

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Derives the miter of two networks.]

  Description [Preprocesses the networks to make sure that they are strashed.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiter( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fComb, int nPartSize )
{
    Abc_Ntk_t * pTemp = NULL;
    int fRemove1, fRemove2;
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk1) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk2) );
    // check that the networks have the same PIs/POs/latches
    if ( !Abc_NtkCompareSignals( pNtk1, pNtk2, 0, fComb ) )
        return NULL;
    // make sure the circuits are strashed 
    fRemove1 = (!Abc_NtkIsStrash(pNtk1)) && (pNtk1 = Abc_NtkStrash(pNtk1, 0, 0, 0));
    fRemove2 = (!Abc_NtkIsStrash(pNtk2)) && (pNtk2 = Abc_NtkStrash(pNtk2, 0, 0, 0));
    if ( pNtk1 && pNtk2 )
        pTemp = Abc_NtkMiterInt( pNtk1, pNtk2, fComb, nPartSize );
    if ( fRemove1 )  Abc_NtkDelete( pNtk1 );
    if ( fRemove2 )  Abc_NtkDelete( pNtk2 );
    return pTemp;
}

/**Function*************************************************************

  Synopsis    [Derives the miter of two sequential networks.]

  Description [Assumes that the networks are strashed.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterInt( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fComb, int nPartSize )
{
    char Buffer[1000];
    Abc_Ntk_t * pNtkMiter;

    assert( Abc_NtkIsStrash(pNtk1) );
    assert( Abc_NtkIsStrash(pNtk2) );

    // start the new network
    pNtkMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    sprintf( Buffer, "%s_%s_miter", pNtk1->pName, pNtk2->pName );
    pNtkMiter->pName = Extra_UtilStrsav(Buffer);

    // perform strashing
    Abc_NtkMiterPrepare( pNtk1, pNtk2, pNtkMiter, fComb, nPartSize );
    Abc_NtkMiterAddOne( pNtk1, pNtkMiter );
    Abc_NtkMiterAddOne( pNtk2, pNtkMiter );
    Abc_NtkMiterFinalize( pNtk1, pNtk2, pNtkMiter, fComb, nPartSize );
    Abc_AigCleanup(pNtkMiter->pManFunc);

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkMiter ) )
    {
        printf( "Abc_NtkMiter: The network check has failed.\n" );
        Abc_NtkDelete( pNtkMiter );
        return NULL;
    }
    return pNtkMiter;
}

/**Function*************************************************************

  Synopsis    [Prepares the network for mitering.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkMiterPrepare( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, Abc_Ntk_t * pNtkMiter, int fComb, int nPartSize )
{
    Abc_Obj_t * pObj, * pObjNew;
    int i;
    // clean the copy field in all objects
//    Abc_NtkCleanCopy( pNtk1 );
//    Abc_NtkCleanCopy( pNtk2 );
    Abc_AigConst1(pNtk1)->pCopy = Abc_AigConst1(pNtkMiter);
    Abc_AigConst1(pNtk2)->pCopy = Abc_AigConst1(pNtkMiter);

    if ( fComb )
    {
        // create new PIs and remember them in the old PIs
        Abc_NtkForEachCi( pNtk1, pObj, i )
        {
            pObjNew = Abc_NtkCreatePi( pNtkMiter );
            // remember this PI in the old PIs
            pObj->pCopy = pObjNew;
            pObj = Abc_NtkCi(pNtk2, i);  
            pObj->pCopy = pObjNew;
            // add name
            Abc_ObjAssignName( pObjNew, Abc_ObjName(pObj), NULL );
        }
        if ( nPartSize <= 0 )
        {
            // create the only PO
            pObjNew = Abc_NtkCreatePo( pNtkMiter );
            // add the PO name
            Abc_ObjAssignName( pObjNew, "miter", NULL );
        }
    }
    else
    {
        // create new PIs and remember them in the old PIs
        Abc_NtkForEachPi( pNtk1, pObj, i )
        {
            pObjNew = Abc_NtkCreatePi( pNtkMiter );
            // remember this PI in the old PIs
            pObj->pCopy = pObjNew;
            pObj = Abc_NtkPi(pNtk2, i);  
            pObj->pCopy = pObjNew;
            // add name
            Abc_ObjAssignName( pObjNew, Abc_ObjName(pObj), NULL );
        }
        if ( nPartSize <= 0 )
        {
            // create the only PO
            pObjNew = Abc_NtkCreatePo( pNtkMiter );
            // add the PO name
            Abc_ObjAssignName( pObjNew, "miter", NULL );
        }
        // create the latches
        Abc_NtkForEachLatch( pNtk1, pObj, i )
        {
            pObjNew = Abc_NtkDupBox( pNtkMiter, pObj, 0 );
            // add names
            Abc_ObjAssignName( pObjNew, Abc_ObjName(pObj), "_1" );
            Abc_ObjAssignName( Abc_ObjFanin0(pObjNew),  Abc_ObjName(Abc_ObjFanin0(pObj)), "_1" );
            Abc_ObjAssignName( Abc_ObjFanout0(pObjNew), Abc_ObjName(Abc_ObjFanout0(pObj)), "_1" );
        }
        Abc_NtkForEachLatch( pNtk2, pObj, i )
        {
            pObjNew = Abc_NtkDupBox( pNtkMiter, pObj, 0 );
            // add name
            Abc_ObjAssignName( pObjNew, Abc_ObjName(pObj), "_2" );
            Abc_ObjAssignName( Abc_ObjFanin0(pObjNew),  Abc_ObjName(Abc_ObjFanin0(pObj)), "_2" );
            Abc_ObjAssignName( Abc_ObjFanout0(pObjNew), Abc_ObjName(Abc_ObjFanout0(pObj)), "_2" );
        }
    }
}

/**Function*************************************************************

  Synopsis    [Performs mitering for one network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkMiterAddOne( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkMiter )
{
    Abc_Obj_t * pNode;
    int i;
    assert( Abc_NtkIsDfsOrdered(pNtk) );
    Abc_AigForEachAnd( pNtk, pNode, i )
        pNode->pCopy = Abc_AigAnd( pNtkMiter->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
}

/**Function*************************************************************

  Synopsis    [Performs mitering for one network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkMiterAddCone( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkMiter, Abc_Obj_t * pRoot )
{
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pNode;
    int i;
    // map the constant nodes
    Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pNtkMiter);
    // perform strashing
    vNodes = Abc_NtkDfsNodes( pNtk, &pRoot, 1 );
    Vec_PtrForEachEntry( vNodes, pNode, i )
        if ( Abc_AigNodeIsAnd(pNode) )
            pNode->pCopy = Abc_AigAnd( pNtkMiter->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
    Vec_PtrFree( vNodes );
}


/**Function*************************************************************

  Synopsis    [Finalizes the miter by adding the output part.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkMiterFinalize( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, Abc_Ntk_t * pNtkMiter, int fComb, int nPartSize )
{
    Vec_Ptr_t * vPairs;
    Abc_Obj_t * pMiter, * pNode;
    int i;
    // collect the PO pairs from both networks
    vPairs = Vec_PtrAlloc( 100 );
    if ( fComb )
    {
        // collect the CO nodes for the miter
        Abc_NtkForEachCo( pNtk1, pNode, i )
        {
            Vec_PtrPush( vPairs, Abc_ObjChild0Copy(pNode) );
            pNode = Abc_NtkCo( pNtk2, i );
            Vec_PtrPush( vPairs, Abc_ObjChild0Copy(pNode) );
        }
    }
    else
    {
        // collect the PO nodes for the miter
        Abc_NtkForEachPo( pNtk1, pNode, i )
        {
            Vec_PtrPush( vPairs, Abc_ObjChild0Copy(pNode) );
            pNode = Abc_NtkPo( pNtk2, i );
            Vec_PtrPush( vPairs, Abc_ObjChild0Copy(pNode) );
        }
        // connect new latches
        Abc_NtkForEachLatch( pNtk1, pNode, i )
            Abc_ObjAddFanin( Abc_ObjFanin0(pNode)->pCopy, Abc_ObjChild0Copy(Abc_ObjFanin0(pNode)) );
        Abc_NtkForEachLatch( pNtk2, pNode, i )
            Abc_ObjAddFanin( Abc_ObjFanin0(pNode)->pCopy, Abc_ObjChild0Copy(Abc_ObjFanin0(pNode)) );
    }
    // add the miter
    if ( nPartSize <= 0 )
    {
        pMiter = Abc_AigMiter( pNtkMiter->pManFunc, vPairs );
        Abc_ObjAddFanin( Abc_NtkPo(pNtkMiter,0), pMiter );
        Vec_PtrFree( vPairs );
    }
    else
    {
        char Buffer[1024];
        Vec_Ptr_t * vPairsPart;
        int nParts, i, k, iCur;
        assert( Vec_PtrSize(vPairs) == 2 * Abc_NtkCoNum(pNtk1) );
        // create partitions
        nParts = Abc_NtkCoNum(pNtk1) / nPartSize + (int)((Abc_NtkCoNum(pNtk1) % nPartSize) > 0);
        vPairsPart = Vec_PtrAlloc( nPartSize );
        for ( i = 0; i < nParts; i++ )
        {
            Vec_PtrClear( vPairsPart );
            for ( k = 0; k < nPartSize; k++ )
            {
                iCur = i * nPartSize + k;
                if ( iCur >= Abc_NtkCoNum(pNtk1) )
                    break;
                Vec_PtrPush( vPairsPart, Vec_PtrEntry(vPairs, 2*iCur  ) );
                Vec_PtrPush( vPairsPart, Vec_PtrEntry(vPairs, 2*iCur+1) );
            }
            pMiter = Abc_AigMiter( pNtkMiter->pManFunc, vPairsPart );
            pNode = Abc_NtkCreatePo( pNtkMiter );
            Abc_ObjAddFanin( pNode, pMiter );
            // assign the name to the node
            if ( nPartSize == 1 )
                sprintf( Buffer, "%s", Abc_ObjName(Abc_NtkCo(pNtk1,i)) );
            else
                sprintf( Buffer, "%d", i );
            Abc_ObjAssignName( pNode, "miter_", Buffer );
        }
        Vec_PtrFree( vPairsPart );
        Vec_PtrFree( vPairs );
    }
}



/**Function*************************************************************

  Synopsis    [Derives the AND of two miters.]

  Description [The network should have the same names of PIs.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterAnd( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fOr, int fCompl2 )
{
    char Buffer[1000];
    Abc_Ntk_t * pNtkMiter;
    Abc_Obj_t * pOutput1, * pOutput2;
    Abc_Obj_t * pRoot1, * pRoot2, * pMiter;

    assert( Abc_NtkIsStrash(pNtk1) );
    assert( Abc_NtkIsStrash(pNtk2) );
    assert( 1 == Abc_NtkCoNum(pNtk1) );
    assert( 1 == Abc_NtkCoNum(pNtk2) );
    assert( 0 == Abc_NtkLatchNum(pNtk1) );
    assert( 0 == Abc_NtkLatchNum(pNtk2) );
    assert( Abc_NtkCiNum(pNtk1) == Abc_NtkCiNum(pNtk2) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk1) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk2) );

    // start the new network
    pNtkMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
//    sprintf( Buffer, "%s_%s_miter", pNtk1->pName, pNtk2->pName );
    sprintf( Buffer, "product" );
    pNtkMiter->pName = Extra_UtilStrsav(Buffer);

    // perform strashing
    Abc_NtkMiterPrepare( pNtk1, pNtk2, pNtkMiter, 1, -1 );
    Abc_NtkMiterAddOne( pNtk1, pNtkMiter );
    Abc_NtkMiterAddOne( pNtk2, pNtkMiter );
//    Abc_NtkMiterFinalize( pNtk1, pNtk2, pNtkMiter, 1 );
    pRoot1 = Abc_NtkPo(pNtk1,0);
    pRoot2 = Abc_NtkPo(pNtk2,0);
    pOutput1 = Abc_ObjNotCond( Abc_ObjFanin0(pRoot1)->pCopy, Abc_ObjFaninC0(pRoot1) );
    pOutput2 = Abc_ObjNotCond( Abc_ObjFanin0(pRoot2)->pCopy, Abc_ObjFaninC0(pRoot2) ^ fCompl2 );
    
    // create the miter of the two outputs
    if ( fOr )
        pMiter = Abc_AigOr( pNtkMiter->pManFunc, pOutput1, pOutput2 );
    else
        pMiter = Abc_AigAnd( pNtkMiter->pManFunc, pOutput1, pOutput2 );
    Abc_ObjAddFanin( Abc_NtkPo(pNtkMiter,0), pMiter );

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkMiter ) )
    {
        printf( "Abc_NtkMiterAnd: The network check has failed.\n" );
        Abc_NtkDelete( pNtkMiter );
        return NULL;
    }
    return pNtkMiter;
}


/**Function*************************************************************

  Synopsis    [Derives the cofactor of the miter w.r.t. the set of vars.]

  Description [The array of variable values contains -1/0/1 for each PI.
  -1 means this PI remains, 0/1 means this PI is set to 0/1.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterCofactor( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues )
{
    char Buffer[1000];
    Abc_Ntk_t * pNtkMiter;
    Abc_Obj_t * pRoot, * pOutput1;
    int Value, i;

    assert( Abc_NtkIsStrash(pNtk) );
    assert( 1 == Abc_NtkCoNum(pNtk) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk) );

    // start the new network
    pNtkMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    sprintf( Buffer, "%s_miter", pNtk->pName );
    pNtkMiter->pName = Extra_UtilStrsav(Buffer);

    // get the root output
    pRoot = Abc_NtkCo( pNtk, 0 );

    // perform strashing
    Abc_NtkMiterPrepare( pNtk, pNtk, pNtkMiter, 1, -1 );
    // set the first cofactor
    Vec_IntForEachEntry( vPiValues, Value, i )
    {
        if ( Value == -1 )
            continue;
        if ( Value == 0 )
        {
            Abc_NtkCi(pNtk, i)->pCopy = Abc_ObjNot( Abc_AigConst1(pNtkMiter) );
            continue;
        }
        if ( Value == 1 )
        {
            Abc_NtkCi(pNtk, i)->pCopy = Abc_AigConst1(pNtkMiter);
            continue;
        }
        assert( 0 );
    }
    // add the first cofactor
    Abc_NtkMiterAddCone( pNtk, pNtkMiter, pRoot );

    // save the output
    pOutput1 = Abc_ObjNotCond( Abc_ObjFanin0(pRoot)->pCopy, Abc_ObjFaninC0(pRoot) );

    // create the miter of the two outputs
    Abc_ObjAddFanin( Abc_NtkPo(pNtkMiter,0), pOutput1 );

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkMiter ) )
    {
        printf( "Abc_NtkMiterCofactor: The network check has failed.\n" );
        Abc_NtkDelete( pNtkMiter );
        return NULL;
    }
    return pNtkMiter;
}
/**Function*************************************************************

  Synopsis    [Derives the miter of two cofactors of one output.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterForCofactors( Abc_Ntk_t * pNtk, int Out, int In1, int In2 )
{
    char Buffer[1000];
    Abc_Ntk_t * pNtkMiter;
    Abc_Obj_t * pRoot, * pOutput1, * pOutput2, * pMiter;

    assert( Abc_NtkIsStrash(pNtk) );
    assert( Out < Abc_NtkCoNum(pNtk) );
    assert( In1 < Abc_NtkCiNum(pNtk) );
    assert( In2 < Abc_NtkCiNum(pNtk) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk) );

    // start the new network
    pNtkMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    sprintf( Buffer, "%s_miter", Abc_ObjName(Abc_NtkCo(pNtk, Out)) );
    pNtkMiter->pName = Extra_UtilStrsav(Buffer);

    // get the root output
    pRoot = Abc_NtkCo( pNtk, Out );

    // perform strashing
    Abc_NtkMiterPrepare( pNtk, pNtk, pNtkMiter, 1, -1 );
    // set the first cofactor
    Abc_NtkCi(pNtk, In1)->pCopy = Abc_ObjNot( Abc_AigConst1(pNtkMiter) );
    if ( In2 >= 0 )
    Abc_NtkCi(pNtk, In2)->pCopy = Abc_AigConst1(pNtkMiter);
    // add the first cofactor
    Abc_NtkMiterAddCone( pNtk, pNtkMiter, pRoot );

    // save the output
    pOutput1 = Abc_ObjFanin0(pRoot)->pCopy;

    // set the second cofactor
    Abc_NtkCi(pNtk, In1)->pCopy = Abc_AigConst1(pNtkMiter);
    if ( In2 >= 0 )
    Abc_NtkCi(pNtk, In2)->pCopy = Abc_ObjNot( Abc_AigConst1(pNtkMiter) );
    // add the second cofactor
    Abc_NtkMiterAddCone( pNtk, pNtkMiter, pRoot );

    // save the output
    pOutput2 = Abc_ObjFanin0(pRoot)->pCopy;

    // create the miter of the two outputs
    pMiter = Abc_AigXor( pNtkMiter->pManFunc, pOutput1, pOutput2 );
    Abc_ObjAddFanin( Abc_NtkPo(pNtkMiter,0), pMiter );

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkMiter ) )
    {
        printf( "Abc_NtkMiter: The network check has failed.\n" );
        Abc_NtkDelete( pNtkMiter );
        return NULL;
    }
    return pNtkMiter;
}


/**Function*************************************************************

  Synopsis    [Derives the miter of two cofactors of one output.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterQuantify( Abc_Ntk_t * pNtk, int In, int fExist )
{
    Abc_Ntk_t * pNtkMiter;
    Abc_Obj_t * pRoot, * pOutput1, * pOutput2, * pMiter;

    assert( Abc_NtkIsStrash(pNtk) );
    assert( 1 == Abc_NtkCoNum(pNtk) );
    assert( In < Abc_NtkCiNum(pNtk) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk) );

    // start the new network
    pNtkMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    pNtkMiter->pName = Extra_UtilStrsav( Abc_ObjName(Abc_NtkCo(pNtk, 0)) );

    // get the root output
    pRoot = Abc_NtkCo( pNtk, 0 );

    // perform strashing
    Abc_NtkMiterPrepare( pNtk, pNtk, pNtkMiter, 1, -1 );
    // set the first cofactor
    Abc_NtkCi(pNtk, In)->pCopy = Abc_ObjNot( Abc_AigConst1(pNtkMiter) );
    // add the first cofactor
    Abc_NtkMiterAddCone( pNtk, pNtkMiter, pRoot );
    // save the output
//    pOutput1 = Abc_ObjFanin0(pRoot)->pCopy;
    pOutput1 = Abc_ObjNotCond( Abc_ObjFanin0(pRoot)->pCopy, Abc_ObjFaninC0(pRoot) );

    // set the second cofactor
    Abc_NtkCi(pNtk, In)->pCopy = Abc_AigConst1(pNtkMiter);
    // add the second cofactor
    Abc_NtkMiterAddCone( pNtk, pNtkMiter, pRoot );
    // save the output
//    pOutput2 = Abc_ObjFanin0(pRoot)->pCopy;
    pOutput2 = Abc_ObjNotCond( Abc_ObjFanin0(pRoot)->pCopy, Abc_ObjFaninC0(pRoot) );

    // create the miter of the two outputs
    if ( fExist ) 
        pMiter = Abc_AigOr( pNtkMiter->pManFunc, pOutput1, pOutput2 );
    else
        pMiter = Abc_AigAnd( pNtkMiter->pManFunc, pOutput1, pOutput2 );
    Abc_ObjAddFanin( Abc_NtkPo(pNtkMiter,0), pMiter );

    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkMiter ) )
    {
        printf( "Abc_NtkMiter: The network check has failed.\n" );
        Abc_NtkDelete( pNtkMiter );
        return NULL;
    }
    return pNtkMiter;
}

/**Function*************************************************************

  Synopsis    [Quantifies all the PIs existentially from the only PO of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkMiterQuantifyPis( Abc_Ntk_t * pNtk )
{
    Abc_Ntk_t * pNtkTemp;
    Abc_Obj_t * pObj;
    int i;
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk) );

    Abc_NtkForEachPi( pNtk, pObj, i )
    {
        if ( Abc_ObjFanoutNum(pObj) == 0 )
            continue;
        pNtk = Abc_NtkMiterQuantify( pNtkTemp = pNtk, i, 1 );
        Abc_NtkDelete( pNtkTemp );
    }

    return pNtk;
}




/**Function*************************************************************

  Synopsis    [Checks the status of the miter.]

  Description [Return 0 if the miter is sat for at least one output.
  Return 1 if the miter is unsat for all its outputs. Returns -1 if the
  miter is undecided for some outputs.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkMiterIsConstant( Abc_Ntk_t * pMiter )
{
    Abc_Obj_t * pNodePo, * pChild;
    int i;
    assert( Abc_NtkIsStrash(pMiter) );
    Abc_NtkForEachPo( pMiter, pNodePo, i )
    {
        pChild = Abc_ObjChild0( pNodePo );
        // check if the output is constant 1
        if ( Abc_AigNodeIsConst(pChild) )
        {
            assert( Abc_ObjRegular(pChild) == Abc_AigConst1(pMiter) );
            if ( !Abc_ObjIsComplement(pChild) )
            {
                // if the miter is constant 1, return immediately
//                printf( "MITER IS CONSTANT 1!\n" );
                return 0;
            }
        }
/*
        // check if the output is not constant 0
        else if ( Abc_ObjRegular(pChild)->fPhase != (unsigned)Abc_ObjIsComplement(pChild) )
        {
            return 0;
        }
*/
        // if the miter is undecided (or satisfiable), return immediately
        else 
            return -1;
    }
    // return 1, meaning all outputs are constant zero
    return 1;
}

/**Function*************************************************************

  Synopsis    [Reports the status of the miter.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkMiterReport( Abc_Ntk_t * pMiter )
{
    Abc_Obj_t * pChild, * pNode;
    int i;
    if ( Abc_NtkPoNum(pMiter) == 1 )
    {
        pChild = Abc_ObjChild0( Abc_NtkPo(pMiter,0) );
        if ( Abc_AigNodeIsConst(pChild) )
        {
            if ( Abc_ObjIsComplement(pChild) )
                printf( "Unsatisfiable.\n" );
            else
                printf( "Satisfiable. (Constant 1).\n" );
        }
        else
            printf( "Satisfiable.\n" );
    }
    else
    {
        Abc_NtkForEachPo( pMiter, pNode, i )
        {
            pChild = Abc_ObjChild0( Abc_NtkPo(pMiter,i) );
            printf( "Output #%2d : ", i );
            if ( Abc_AigNodeIsConst(pChild) )
            {
                if ( Abc_ObjIsComplement(pChild) )
                    printf( "Unsatisfiable.\n" );
                else
                    printf( "Satisfiable. (Constant 1).\n" );
            }
            else
                printf( "Satisfiable.\n" );
        }
    }
}


/**Function*************************************************************

  Synopsis    [Derives the timeframes of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkFrames( Abc_Ntk_t * pNtk, int nFrames, int fInitial )
{
    char Buffer[1000];
    ProgressBar * pProgress;
    Abc_Ntk_t * pNtkFrames;
    Abc_Obj_t * pLatch, * pLatchOut;
    int i, Counter;
    assert( nFrames > 0 );
    assert( Abc_NtkIsStrash(pNtk) );
    assert( Abc_NtkIsDfsOrdered(pNtk) );
    assert( Abc_NtkHasOnlyLatchBoxes(pNtk) );
    // start the new network
    pNtkFrames = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    sprintf( Buffer, "%s_%d_frames", pNtk->pName, nFrames );
    pNtkFrames->pName = Extra_UtilStrsav(Buffer);
    // map the constant nodes
    Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pNtkFrames);
    // create new latches (or their initial values) and remember them in the new latches
    if ( !fInitial )
    {
        Abc_NtkForEachLatch( pNtk, pLatch, i )
            Abc_NtkDupBox( pNtkFrames, pLatch, 1 );
    }
    else
    {
        Counter = 0;
        Abc_NtkForEachLatch( pNtk, pLatch, i )
        {
            pLatchOut = Abc_ObjFanout0(pLatch);
            if ( Abc_LatchIsInitNone(pLatch) || Abc_LatchIsInitDc(pLatch) ) // don't-care initial value - create a new PI
            {
                pLatchOut->pCopy = Abc_NtkCreatePi(pNtkFrames);
                Abc_ObjAssignName( pLatchOut->pCopy, Abc_ObjName(pLatchOut), NULL );
                Counter++;
            }
            else
                pLatchOut->pCopy = Abc_ObjNotCond( Abc_AigConst1(pNtkFrames), Abc_LatchIsInit0(pLatch) );
        }
        if ( Counter )
            printf( "Warning: %d uninitialized latches are replaced by free PI variables.\n", Counter );
    }
    
    // create the timeframes
    pProgress = Extra_ProgressBarStart( stdout, nFrames );
    for ( i = 0; i < nFrames; i++ )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        Abc_NtkAddFrame( pNtkFrames, pNtk, i );
    }
    Extra_ProgressBarStop( pProgress );
    
    // connect the new latches to the outputs of the last frame
    if ( !fInitial )
    {
        // we cannot use pLatch->pCopy here because pLatch->pCopy is used for temporary storage of strashed values
        Abc_NtkForEachLatch( pNtk, pLatch, i )
            Abc_ObjAddFanin( Abc_ObjFanin0(pLatch)->pCopy, Abc_ObjFanout0(pLatch)->pCopy );
    }

    // remove dangling nodes
    Abc_AigCleanup( pNtkFrames->pManFunc );
    // reorder the latches
    Abc_NtkOrderCisCos( pNtkFrames );
    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkFrames ) )
    {
        printf( "Abc_NtkFrames: The network check has failed.\n" );
        Abc_NtkDelete( pNtkFrames );
        return NULL;
    }
    return pNtkFrames;
}

/**Function*************************************************************

  Synopsis    [Adds one time frame to the new network.]

  Description [Assumes that the latches of the old network point
  to the outputs of the previous frame of the new network (pLatch->pCopy). 
  In the end, updates the latches of the old network to point to the 
  outputs of the current frame of the new network.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkAddFrame( Abc_Ntk_t * pNtkFrames, Abc_Ntk_t * pNtk, int iFrame )
{
    char Buffer[10];
    Abc_Obj_t * pNode, * pLatch;
    int i;
    // create the prefix to be added to the node names
    sprintf( Buffer, "_%02d", iFrame );
    // add the new PI nodes
    Abc_NtkForEachPi( pNtk, pNode, i )
        Abc_ObjAssignName( Abc_NtkDupObj(pNtkFrames, pNode, 0), Abc_ObjName(pNode), Buffer );
    // add the internal nodes
    Abc_AigForEachAnd( pNtk, pNode, i )
        pNode->pCopy = Abc_AigAnd( pNtkFrames->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
    // add the new POs
    Abc_NtkForEachPo( pNtk, pNode, i )
    {
        Abc_ObjAssignName( Abc_NtkDupObj(pNtkFrames, pNode, 0), Abc_ObjName(pNode), Buffer );
        Abc_ObjAddFanin( pNode->pCopy, Abc_ObjChild0Copy(pNode) );
    }
    // add the new asserts
    Abc_NtkForEachAssert( pNtk, pNode, i )
    {
        Abc_ObjAssignName( Abc_NtkDupObj(pNtkFrames, pNode, 0), Abc_ObjName(pNode), Buffer );
        Abc_ObjAddFanin( pNode->pCopy, Abc_ObjChild0Copy(pNode) );
    }
    // transfer the implementation of the latch inputs to the latch outputs
    Abc_NtkForEachLatch( pNtk, pLatch, i )
        pLatch->pCopy = Abc_ObjChild0Copy(Abc_ObjFanin0(pLatch));
    Abc_NtkForEachLatch( pNtk, pLatch, i )
        Abc_ObjFanout0(pLatch)->pCopy = pLatch->pCopy;
}



/**Function*************************************************************

  Synopsis    [Derives the timeframes of the network.]

  Description []

  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkFrames2( Abc_Ntk_t * pNtk, int nFrames, int fInitial, AddFrameMapping addFrameMapping, void* arg )
{
/*
    char Buffer[1000];
    ProgressBar * pProgress;
    Abc_Ntk_t * pNtkFrames;
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pLatch, * pLatchNew;
    int i, Counter;
    assert( nFrames > 0 );
    assert( Abc_NtkIsStrash(pNtk) );   
    // start the new network
    pNtkFrames = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    sprintf( Buffer, "%s_%d_frames", pNtk->pName, nFrames );
    pNtkFrames->pName = Extra_UtilStrsav(Buffer);
    // create new latches (or their initial values) and remember them in the new latches
    if ( !fInitial )
    {
        Abc_NtkForEachLatch( pNtk, pLatch, i ) {
            Abc_NtkDupObj( pNtkFrames, pLatch );
            if (addFrameMapping) addFrameMapping(pLatch->pCopy, pLatch, 0, arg);
        }
    }
    else
    {
        Counter = 0;
        Abc_NtkForEachLatch( pNtk, pLatch, i )
        {
            if ( Abc_LatchIsInitDc(pLatch) ) // don't-care initial value - create a new PI
            {
                pLatch->pCopy = Abc_NtkCreatePi(pNtkFrames);
                Abc_ObjAssignName( pLatch->pCopy, Abc_ObjName(pLatch), NULL );
                Counter++;
            }
            else {
                pLatch->pCopy = Abc_ObjNotCond( Abc_AigConst1(pNtkFrames), Abc_LatchIsInit0(pLatch) );
            }
 
            if (addFrameMapping) addFrameMapping(pLatch->pCopy, pLatch, 0, arg);
        }
        if ( Counter )
            printf( "Warning: %d uninitialized latches are replaced by free PI variables.\n", Counter );
    }
    
    // create the timeframes
    vNodes = Abc_NtkDfs( pNtk, 0 );
    pProgress = Extra_ProgressBarStart( stdout, nFrames );
    for ( i = 0; i < nFrames; i++ )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        Abc_NtkAddFrame2( pNtkFrames, pNtk, i, vNodes, addFrameMapping, arg );
    }
    Extra_ProgressBarStop( pProgress );
    Vec_PtrFree( vNodes );
    
    // connect the new latches to the outputs of the last frame
    if ( !fInitial )
    {
        Abc_NtkForEachLatch( pNtk, pLatch, i )
        {
            pLatchNew = Abc_NtkBox(pNtkFrames, i);
            Abc_ObjAddFanin( pLatchNew, pLatch->pCopy );
            Abc_ObjAssignName( pLatchNew, Abc_ObjName(pLatch), NULL );
        }
    }
    Abc_NtkForEachLatch( pNtk, pLatch, i )
        pLatch->pNext = NULL;

    // remove dangling nodes
    Abc_AigCleanup( pNtkFrames->pManFunc );

    // reorder the latches
    Abc_NtkOrderCisCos( pNtkFrames );
    
    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtkFrames ) )
    {
        printf( "Abc_NtkFrames: The network check has failed.\n" );
        Abc_NtkDelete( pNtkFrames );
        return NULL;
    }
    return pNtkFrames;
*/
    return NULL;
}

/**Function*************************************************************

  Synopsis    [Adds one time frame to the new network.]

  Description [Assumes that the latches of the old network point
  to the outputs of the previous frame of the new network (pLatch->pCopy). 
  In the end, updates the latches of the old network to point to the 
  outputs of the current frame of the new network.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkAddFrame2( Abc_Ntk_t * pNtkFrames, Abc_Ntk_t * pNtk, int iFrame, Vec_Ptr_t * vNodes, AddFrameMapping addFrameMapping, void* arg )
{
/*
    char Buffer[10];
    Abc_Obj_t * pNode, * pNodeNew, * pLatch;
    Abc_Obj_t * pConst1, * pConst1New;
    int i;
    // get the constant nodes
    pConst1    = Abc_AigConst1(pNtk);
    pConst1New = Abc_AigConst1(pNtkFrames);
    // create the prefix to be added to the node names
    sprintf( Buffer, "_%02d", iFrame );
    // add the new PI nodes
    Abc_NtkForEachPi( pNtk, pNode, i )
    {
        pNodeNew = Abc_NtkDupObj( pNtkFrames, pNode );       
        Abc_ObjAssignName( pNodeNew, Abc_ObjName(pNode), Buffer );
        if (addFrameMapping) addFrameMapping(pNodeNew, pNode, iFrame, arg);
    }
    // add the internal nodes
    Vec_PtrForEachEntry( vNodes, pNode, i )
    {
        if ( pNode == pConst1 )
            pNodeNew = pConst1New;
        else
            pNodeNew = Abc_AigAnd( pNtkFrames->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
        pNode->pCopy = pNodeNew;
        if (addFrameMapping) addFrameMapping(pNodeNew, pNode, iFrame, arg);
    }
    // add the new POs
    Abc_NtkForEachPo( pNtk, pNode, i )
    {
        pNodeNew = Abc_NtkDupObj( pNtkFrames, pNode );       
        Abc_ObjAddFanin( pNodeNew, Abc_ObjChild0Copy(pNode) );
        Abc_ObjAssignName( pNodeNew, Abc_ObjName(pNode), Buffer );
        if (addFrameMapping) addFrameMapping(pNodeNew, pNode, iFrame, arg);
    }
    // transfer the implementation of the latch drivers to the latches

    // it is important that these two steps are performed it two loops
    // and not in the same loop
    Abc_NtkForEachLatch( pNtk, pLatch, i ) 
        pLatch->pNext = Abc_ObjChild0Copy(pLatch);
    Abc_NtkForEachLatch( pNtk, pLatch, i ) 
        pLatch->pCopy = pLatch->pNext;

    Abc_NtkForEachLatch( pNtk, pLatch, i ) 
    {
        if (addFrameMapping) {
            // don't give Mike complemented pointers because he doesn't like it
            if (Abc_ObjIsComplement(pLatch->pCopy)) {            
                pNodeNew = Abc_NtkCreateNode( pNtkFrames );
                Abc_ObjAddFanin( pNodeNew, pLatch->pCopy );
                assert(Abc_ObjFaninNum(pNodeNew) == 1);
                pNodeNew->Level = 1 + Abc_ObjRegular(pLatch->pCopy)->Level;

                pLatch->pNext = pNodeNew;
                pLatch->pCopy = pNodeNew;
            }
            addFrameMapping(pLatch->pCopy, pLatch, iFrame+1, arg);
        }
    }
*/
}



/**Function*************************************************************

  Synopsis    [Splits the miter into two logic cones combined by an EXOR]

  Description []

  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkDemiter( Abc_Ntk_t * pNtk )
{
    Abc_Obj_t * pNodeC, * pNodeA, * pNodeB, * pNode;
    Abc_Obj_t * pPoNew;
    Vec_Ptr_t * vNodes1, * vNodes2;
    int nCommon, i;

    assert( Abc_NtkIsStrash(pNtk) );
    assert( Abc_NtkPoNum(pNtk) == 1 );
    if ( !Abc_NodeIsExorType(Abc_ObjFanin0(Abc_NtkPo(pNtk,0))) )
    {
        printf( "The root of the miter is not an EXOR gate.\n" );
        return 0;
    }
    pNodeC = Abc_NodeRecognizeMux( Abc_ObjFanin0(Abc_NtkPo(pNtk,0)), &pNodeA, &pNodeB );
    assert( Abc_ObjRegular(pNodeA) == Abc_ObjRegular(pNodeB) );
    if ( Abc_ObjFaninC0(Abc_NtkPo(pNtk,0)) )
    {
        pNodeA = Abc_ObjNot(pNodeA);
        pNodeB = Abc_ObjNot(pNodeB);
    }

    // add the PO corresponding to control input
    pPoNew = Abc_NtkCreatePo( pNtk );
    Abc_ObjAddFanin( pPoNew, pNodeC );
    Abc_ObjAssignName( pPoNew, "addOut1", NULL );

    // add the PO corresponding to other input
    pPoNew = Abc_NtkCreatePo( pNtk );
    Abc_ObjAddFanin( pPoNew, pNodeB );
    Abc_ObjAssignName( pPoNew, "addOut2", NULL );

    // mark the nodes in the first cone
    pNodeB = Abc_ObjRegular(pNodeB);
    vNodes1 = Abc_NtkDfsNodes( pNtk, &pNodeC, 1 );
    vNodes2 = Abc_NtkDfsNodes( pNtk, &pNodeB, 1 );

    Vec_PtrForEachEntry( vNodes1, pNode, i )
        pNode->fMarkA = 1;
    nCommon = 0;
    Vec_PtrForEachEntry( vNodes2, pNode, i )
        nCommon += pNode->fMarkA;
    Vec_PtrForEachEntry( vNodes1, pNode, i )
        pNode->fMarkA = 0;

    printf( "First cone = %6d.  Second cone = %6d.  Common = %6d.\n", vNodes1->nSize, vNodes2->nSize, nCommon );
    Vec_PtrFree( vNodes1 );
    Vec_PtrFree( vNodes2 );

    // reorder the latches
    Abc_NtkOrderCisCos( pNtk );
    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtk ) )
        printf( "Abc_NtkDemiter: The network check has failed.\n" );
    return 1;
}

/**Function*************************************************************

  Synopsis    [Computes OR or AND of the POs.]

  Description []

  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkCombinePos( Abc_Ntk_t * pNtk, int fAnd )
{
    Abc_Obj_t * pNode, * pMiter;
    int i;
    assert( Abc_NtkIsStrash(pNtk) );
//    assert( Abc_NtkLatchNum(pNtk) == 0 );
    if ( Abc_NtkPoNum(pNtk) == 1 )
        return 1;
    // start the result
    if ( fAnd )
        pMiter = Abc_AigConst1(pNtk);
    else
        pMiter = Abc_ObjNot( Abc_AigConst1(pNtk) );
    // perform operations on the POs
    Abc_NtkForEachPo( pNtk, pNode, i )
        if ( fAnd )
            pMiter = Abc_AigAnd( pNtk->pManFunc, pMiter, Abc_ObjChild0(pNode) );
        else
            pMiter = Abc_AigOr( pNtk->pManFunc, pMiter, Abc_ObjChild0(pNode) );
    // remove the POs and their names
    for ( i = Abc_NtkPoNum(pNtk) - 1; i >= 0; i-- )
        Abc_NtkDeleteObj( Abc_NtkPo(pNtk, i) );
    assert( Abc_NtkPoNum(pNtk) == 0 );
    // create the new PO
    pNode = Abc_NtkCreatePo( pNtk );
    Abc_ObjAddFanin( pNode, pMiter );
    Abc_ObjAssignName( pNode, "miter", NULL );
    Abc_NtkOrderCisCos( pNtk );
    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtk ) )
    {
        printf( "Abc_NtkOrPos: The network check has failed.\n" );
        return 0;
    }
    return 1;
}

////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////