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
|
/**CFile****************************************************************
FileName [aigDfs.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG package.]
Synopsis [DFS traversal procedures.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: aigDfs.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
#include "tim.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Verifies that the objects are in a topo order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManVerifyTopoOrder( Aig_Man_t * p )
{
Aig_Obj_t * pObj, * pNext;
int i, iBox, iTerm1, nTerms;
Aig_ManSetPioNumbers( p );
Aig_ManIncrementTravId( p );
Aig_ManForEachObj( p, pObj, i )
{
if ( Aig_ObjIsNode(pObj) )
{
pNext = Aig_ObjFanin0(pObj);
if ( !Aig_ObjIsTravIdCurrent(p,pNext) )
{
printf( "Node %d has fanin %d that is not in a topological order.\n", pObj->Id, pNext->Id );
return 0;
}
pNext = Aig_ObjFanin1(pObj);
if ( !Aig_ObjIsTravIdCurrent(p,pNext) )
{
printf( "Node %d has fanin %d that is not in a topological order.\n", pObj->Id, pNext->Id );
return 0;
}
}
else if ( Aig_ObjIsPo(pObj) )
{
pNext = Aig_ObjFanin0(pObj);
if ( !Aig_ObjIsTravIdCurrent(p,pNext) )
{
printf( "Node %d has fanin %d that is not in a topological order.\n", pObj->Id, pNext->Id );
return 0;
}
}
else if ( Aig_ObjIsPi(pObj) )
{
if ( p->pManTime )
{
iBox = Tim_ManBoxForCi( p->pManTime, Aig_ObjPioNum(pObj) );
if ( iBox >= 0 ) // this is not a true PI
{
iTerm1 = Tim_ManBoxInputFirst( p->pManTime, iBox );
nTerms = Tim_ManBoxInputNum( p->pManTime, iBox );
for ( i = 0; i < nTerms; i++ )
{
pNext = Aig_ManPo( p, iTerm1 + i );
assert( Tim_ManBoxForCo( p->pManTime, Aig_ObjPioNum(pNext) ) == iBox );
if ( !Aig_ObjIsTravIdCurrent(p,pNext) )
{
printf( "Box %d has input %d that is not in a topological order.\n", iBox, pNext->Id );
return 0;
}
}
}
}
}
else
assert( 0 );
Aig_ObjSetTravIdCurrent( p, pObj );
}
Aig_ManCleanPioNumbers( p );
return 1;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfs_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
if ( pObj == NULL )
return;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
// if ( Aig_ObjIsPi(pObj) )
// return;
// assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_ObjSetTravIdCurrent(p, pObj);
Aig_ManDfs_rec( p, Aig_ObjFanin0(pObj), vNodes );
Aig_ManDfs_rec( p, Aig_ObjFanin1(pObj), vNodes );
// assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
// Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfs( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
Aig_ManForEachPi( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
Aig_ManDfs_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Levelizes the nodes
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Vec_t * Aig_ManLevelize( Aig_Man_t * p )
{
Aig_Obj_t * pObj;
Vec_Vec_t * vLevels;
int nLevels, i;
nLevels = Aig_ManLevelNum( p );
vLevels = Vec_VecStart( nLevels + 1 );
Aig_ManForEachNode( p, pObj, i )
{
assert( (int)pObj->Level <= nLevels );
Vec_VecPush( vLevels, pObj->Level, pObj );
}
return vLevels;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsPio( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
vNodes = Vec_PtrAlloc( Aig_ManObjNumMax(p) );
Aig_ManForEachPo( p, pObj, i )
Aig_ManDfs_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes and PIs in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsNodes( Aig_Man_t * p, Aig_Obj_t ** ppNodes, int nNodes )
{
Vec_Ptr_t * vNodes;
// Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
// Aig_ManForEachPi( p, pObj, i )
// Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
for ( i = 0; i < nNodes; i++ )
Aig_ManDfs_rec( p, ppNodes[i], vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfsChoices_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
if ( pObj == NULL )
return;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
assert( Aig_ObjIsNode(pObj) );
Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
Aig_ManDfsChoices_rec( p, Aig_ObjFanin1(pObj), vNodes );
Aig_ManDfsChoices_rec( p, p->pEquivs[pObj->Id], vNodes );
assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsChoices( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
assert( p->pEquivs != NULL );
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
Aig_ManForEachPi( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachPo( p, pObj, i )
Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the reverse DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfsReverse_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
Aig_Obj_t * pFanout;
int iFanout = -1, i;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_ObjForEachFanout( p, pObj, pFanout, iFanout, i )
Aig_ManDfsReverse_rec( p, pFanout, vNodes );
assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the reverse DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsReverse( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
// mark POs
Aig_ManForEachPo( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
Aig_ManDfsReverse_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Computes the max number of levels in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManLevelNum( Aig_Man_t * p )
{
Aig_Obj_t * pObj;
int i, LevelsMax;
LevelsMax = 0;
Aig_ManForEachPo( p, pObj, i )
LevelsMax = AIG_MAX( LevelsMax, (int)Aig_ObjFanin0(pObj)->Level );
return LevelsMax;
}
/**Function*************************************************************
Synopsis [Computes the max number of levels in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManCountLevels( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i, LevelsMax, Level0, Level1;
// initialize the levels
Aig_ManConst1(p)->iData = 0;
Aig_ManForEachPi( p, pObj, i )
pObj->iData = 0;
// compute levels in a DFS order
vNodes = Aig_ManDfs( p );
Vec_PtrForEachEntry( vNodes, pObj, i )
{
Level0 = Aig_ObjFanin0(pObj)->iData;
Level1 = Aig_ObjFanin1(pObj)->iData;
pObj->iData = 1 + Aig_ObjIsExor(pObj) + AIG_MAX(Level0, Level1);
}
Vec_PtrFree( vNodes );
// get levels of the POs
LevelsMax = 0;
Aig_ManForEachPo( p, pObj, i )
LevelsMax = AIG_MAX( LevelsMax, Aig_ObjFanin0(pObj)->iData );
return LevelsMax;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeMark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeMark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeCleanAndMark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeCleanAndMark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeCleanAndMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
pObj->pData = NULL;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ConeCountAndMark_rec( Aig_Obj_t * pObj )
{
int Counter;
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return 0;
Counter = 1 + Aig_ConeCountAndMark_rec( Aig_ObjFanin0(pObj) ) +
Aig_ConeCountAndMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
return Counter;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeUnmark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || !Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeUnmark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeUnmark_rec( Aig_ObjFanin1(pObj) );
assert( Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjClearMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_DagSize( Aig_Obj_t * pObj )
{
int Counter;
Counter = Aig_ConeCountAndMark_rec( Aig_Regular(pObj) );
Aig_ConeUnmark_rec( Aig_Regular(pObj) );
return Counter;
}
/**Function*************************************************************
Synopsis [Counts the support size of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_SupportSize_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int * pCounter )
{
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
Aig_ObjSetTravIdCurrent(p, pObj);
if ( Aig_ObjIsPi(pObj) )
{
(*pCounter)++;
return;
}
assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_SupportSize_rec( p, Aig_ObjFanin0(pObj), pCounter );
if ( Aig_ObjFanin1(pObj) )
Aig_SupportSize_rec( p, Aig_ObjFanin1(pObj), pCounter );
}
/**Function*************************************************************
Synopsis [Counts the support size of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_SupportSize( Aig_Man_t * p, Aig_Obj_t * pObj )
{
int Counter = 0;
assert( !Aig_IsComplement(pObj) );
assert( !Aig_ObjIsPo(pObj) );
Aig_ManIncrementTravId( p );
Aig_SupportSize_rec( p, pObj, &Counter );
return Counter;
}
/**Function*************************************************************
Synopsis [Transfers the AIG from one manager into another.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_Transfer_rec( Aig_Man_t * pDest, Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_Transfer_rec( pDest, Aig_ObjFanin0(pObj) );
Aig_Transfer_rec( pDest, Aig_ObjFanin1(pObj) );
pObj->pData = Aig_And( pDest, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Transfers the AIG from one manager into another.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Transfer( Aig_Man_t * pSour, Aig_Man_t * pDest, Aig_Obj_t * pRoot, int nVars )
{
Aig_Obj_t * pObj;
int i;
// solve simple cases
if ( pSour == pDest )
return pRoot;
if ( Aig_ObjIsConst1( Aig_Regular(pRoot) ) )
return Aig_NotCond( Aig_ManConst1(pDest), Aig_IsComplement(pRoot) );
// set the PI mapping
Aig_ManForEachPi( pSour, pObj, i )
{
if ( i == nVars )
break;
pObj->pData = Aig_IthVar(pDest, i);
}
// transfer and set markings
Aig_Transfer_rec( pDest, Aig_Regular(pRoot) );
// clear the markings
Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
}
/**Function*************************************************************
Synopsis [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_Compose_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFunc, Aig_Obj_t * pVar )
{
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsMarkA(pObj) )
return;
if ( Aig_ObjIsConst1(pObj) || Aig_ObjIsPi(pObj) )
{
pObj->pData = pObj == pVar ? pFunc : pObj;
return;
}
Aig_Compose_rec( p, Aig_ObjFanin0(pObj), pFunc, pVar );
Aig_Compose_rec( p, Aig_ObjFanin1(pObj), pFunc, pVar );
pObj->pData = Aig_And( p, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Compose( Aig_Man_t * p, Aig_Obj_t * pRoot, Aig_Obj_t * pFunc, int iVar )
{
// quit if the PI variable is not defined
if ( iVar >= Aig_ManPiNum(p) )
{
printf( "Aig_Compose(): The PI variable %d is not defined.\n", iVar );
return NULL;
}
// recursively perform composition
Aig_Compose_rec( p, Aig_Regular(pRoot), pFunc, Aig_ManPi(p, iVar) );
// clear the markings
Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
}
/**Function*************************************************************
Synopsis [Computes the internal nodes of the cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjCollectCut_rec( Aig_Obj_t * pNode, Vec_Ptr_t * vNodes )
{
// Aig_Obj_t * pFan0 = Aig_ObjFanin0(pNode);
// Aig_Obj_t * pFan1 = Aig_ObjFanin1(pNode);
if ( pNode->fMarkA )
return;
pNode->fMarkA = 1;
assert( Aig_ObjIsNode(pNode) );
Aig_ObjCollectCut_rec( Aig_ObjFanin0(pNode), vNodes );
Aig_ObjCollectCut_rec( Aig_ObjFanin1(pNode), vNodes );
Vec_PtrPush( vNodes, pNode );
//printf( "added %d ", pNode->Id );
}
/**Function*************************************************************
Synopsis [Computes the internal nodes of the cut.]
Description [Does not include the leaves of the cut.]
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjCollectCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes )
{
Aig_Obj_t * pObj;
int i;
// collect and mark the leaves
Vec_PtrClear( vNodes );
Vec_PtrForEachEntry( vLeaves, pObj, i )
{
assert( pObj->fMarkA == 0 );
pObj->fMarkA = 1;
// printf( "%d " , pObj->Id );
}
//printf( "\n" );
// collect and mark the nodes
Aig_ObjCollectCut_rec( pRoot, vNodes );
// clean the nodes
Vec_PtrForEachEntry( vNodes, pObj, i )
pObj->fMarkA = 0;
Vec_PtrForEachEntry( vLeaves, pObj, i )
pObj->fMarkA = 0;
}
/**Function*************************************************************
Synopsis [Collects the nodes of the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCollectSuper_rec( Aig_Obj_t * pRoot, Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
{
int RetValue1, RetValue2, i;
// check if the node is visited
if ( Aig_Regular(pObj)->fMarkA )
{
// check if the node occurs in the same polarity
for ( i = 0; i < vSuper->nSize; i++ )
if ( vSuper->pArray[i] == pObj )
return 1;
// check if the node is present in the opposite polarity
for ( i = 0; i < vSuper->nSize; i++ )
if ( vSuper->pArray[i] == Aig_Not(pObj) )
return -1;
assert( 0 );
return 0;
}
// if the new node is complemented or a PI, another gate begins
if ( pObj != pRoot && (Aig_IsComplement(pObj) || Aig_ObjType(pObj) != Aig_ObjType(pRoot) || Aig_ObjRefs(pObj) > 1) )
{
Vec_PtrPush( vSuper, pObj );
Aig_Regular(pObj)->fMarkA = 1;
return 0;
}
assert( !Aig_IsComplement(pObj) );
assert( Aig_ObjIsNode(pObj) );
// go through the branches
RetValue1 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild0(pObj) ), vSuper );
RetValue2 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild1(pObj) ), vSuper );
if ( RetValue1 == -1 || RetValue2 == -1 )
return -1;
// return 1 if at least one branch has a duplicate
return RetValue1 || RetValue2;
}
/**Function*************************************************************
Synopsis [Collects the nodes of the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCollectSuper( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
{
int RetValue, i;
assert( !Aig_IsComplement(pObj) );
assert( Aig_ObjIsNode(pObj) );
// collect the nodes in the implication supergate
Vec_PtrClear( vSuper );
RetValue = Aig_ObjCollectSuper_rec( pObj, pObj, vSuper );
assert( Vec_PtrSize(vSuper) > 1 );
// unmark the visited nodes
Vec_PtrForEachEntry( vSuper, pObj, i )
Aig_Regular(pObj)->fMarkA = 0;
// if we found the node and its complement in the same implication supergate,
// return empty set of nodes (meaning that we should use constant-0 node)
if ( RetValue == -1 )
vSuper->nSize = 0;
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
