summaryrefslogtreecommitdiffstats
path: root/src/aig/gia/giaCSatOld.c
blob: 75b4c3e0222c058c8b1045c2a5987334a53c997c (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
/**CFile****************************************************************

  FileName    [giaCSat.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Scalable AIG package.]

  Synopsis    [A simple circuit-based solver.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "gia.h"

ABC_NAMESPACE_IMPL_START


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

typedef struct Cbs0_Par_t_ Cbs0_Par_t;
struct Cbs0_Par_t_
{
    // conflict limits
    int           nBTLimit;     // limit on the number of conflicts
    int           nJustLimit;   // limit on the size of justification queue
    // current parameters
    int           nBTThis;      // number of conflicts
    int           nJustThis;    // max size of the frontier
    int           nBTTotal;     // total number of conflicts
    int           nJustTotal;   // total size of the frontier
    // decision heuristics
    int           fUseHighest;  // use node with the highest ID
    int           fUseLowest;   // use node with the highest ID
    int           fUseMaxFF;    // use node with the largest fanin fanout
    // other
    int           fVerbose;
};

typedef struct Cbs0_Que_t_ Cbs0_Que_t;
struct Cbs0_Que_t_
{
    int           iHead;        // beginning of the queue
    int           iTail;        // end of the queue
    int           nSize;        // allocated size
    Gia_Obj_t **  pData;        // nodes stored in the queue
};
 
typedef struct Cbs0_Man_t_ Cbs0_Man_t;
struct Cbs0_Man_t_
{
    Cbs0_Par_t    Pars;         // parameters
    Gia_Man_t *   pAig;         // AIG manager
    Cbs0_Que_t    pProp;        // propagation queue
    Cbs0_Que_t    pJust;        // justification queue
    Vec_Int_t *   vModel;       // satisfying assignment
    // SAT calls statistics
    int           nSatUnsat;    // the number of proofs
    int           nSatSat;      // the number of failure
    int           nSatUndec;    // the number of timeouts
    int           nSatTotal;    // the number of calls
    // conflicts
    int           nConfUnsat;   // conflicts in unsat problems
    int           nConfSat;     // conflicts in sat problems
    int           nConfUndec;   // conflicts in undec problems
    // runtime stats
    clock_t       timeSatUnsat; // unsat
    clock_t       timeSatSat;   // sat
    clock_t       timeSatUndec; // undecided
    clock_t       timeTotal;    // total runtime
};

static inline int   Cbs0_VarIsAssigned( Gia_Obj_t * pVar )      { return pVar->fMark0;                        }
static inline void  Cbs0_VarAssign( Gia_Obj_t * pVar )          { assert(!pVar->fMark0); pVar->fMark0 = 1;    }
static inline void  Cbs0_VarUnassign( Gia_Obj_t * pVar )        { assert(pVar->fMark0);  pVar->fMark0 = 0; pVar->fMark1 = 0;         }
static inline int   Cbs0_VarValue( Gia_Obj_t * pVar )           { assert(pVar->fMark0);  return pVar->fMark1; }
static inline void  Cbs0_VarSetValue( Gia_Obj_t * pVar, int v ) { assert(pVar->fMark0);  pVar->fMark1 = v;    }
static inline int   Cbs0_VarIsJust( Gia_Obj_t * pVar )          { return Gia_ObjIsAnd(pVar) && !Cbs0_VarIsAssigned(Gia_ObjFanin0(pVar)) && !Cbs0_VarIsAssigned(Gia_ObjFanin1(pVar)); } 
static inline int   Cbs0_VarFanin0Value( Gia_Obj_t * pVar )     { return !Cbs0_VarIsAssigned(Gia_ObjFanin0(pVar)) ? 2 : (Cbs0_VarValue(Gia_ObjFanin0(pVar)) ^ Gia_ObjFaninC0(pVar)); }
static inline int   Cbs0_VarFanin1Value( Gia_Obj_t * pVar )     { return !Cbs0_VarIsAssigned(Gia_ObjFanin1(pVar)) ? 2 : (Cbs0_VarValue(Gia_ObjFanin1(pVar)) ^ Gia_ObjFaninC1(pVar)); }

#define Cbs0_QueForEachEntry( Que, pObj, i )                    \
    for ( i = (Que).iHead; (i < (Que).iTail) && ((pObj) = (Que).pData[i]); i++ )

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

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

  Synopsis    [Sets default values of the parameters.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Cbs0_SetDefaultParams( Cbs0_Par_t * pPars )
{
    memset( pPars, 0, sizeof(Cbs0_Par_t) );
    pPars->nBTLimit    =  1000;   // limit on the number of conflicts
    pPars->nJustLimit  =   100;   // limit on the size of justification queue
    pPars->fUseHighest =     1;   // use node with the highest ID
    pPars->fUseLowest  =     0;   // use node with the highest ID
    pPars->fUseMaxFF   =     0;   // use node with the largest fanin fanout
    pPars->fVerbose    =     1;   // print detailed statistics
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Cbs0_Man_t * Cbs0_ManAlloc()
{
    Cbs0_Man_t * p;
    p = ABC_CALLOC( Cbs0_Man_t, 1 );
    p->pProp.nSize = p->pJust.nSize = 10000;
    p->pProp.pData = ABC_ALLOC( Gia_Obj_t *, p->pProp.nSize );
    p->pJust.pData = ABC_ALLOC( Gia_Obj_t *, p->pJust.nSize );
    p->vModel = Vec_IntAlloc( 1000 );
    Cbs0_SetDefaultParams( &p->Pars );
    return p;
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Cbs0_ManStop( Cbs0_Man_t * p )
{
    Vec_IntFree( p->vModel );
    ABC_FREE( p->pProp.pData );
    ABC_FREE( p->pJust.pData );
    ABC_FREE( p );
}

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

  Synopsis    [Returns satisfying assignment.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Vec_Int_t * Cbs0_ReadModel( Cbs0_Man_t * p )
{
    return p->vModel;
}




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

  Synopsis    [Returns 1 if the solver is out of limits.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_ManCheckLimits( Cbs0_Man_t * p )
{
    return p->Pars.nJustThis > p->Pars.nJustLimit || p->Pars.nBTThis > p->Pars.nBTLimit;
}

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

  Synopsis    [Saves the satisfying assignment as an array of literals.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_ManSaveModel( Cbs0_Man_t * p, Vec_Int_t * vCex )
{
    Gia_Obj_t * pVar;
    int i;
    Vec_IntClear( vCex );
    p->pProp.iHead = 0;
    Cbs0_QueForEachEntry( p->pProp, pVar, i )
        if ( Gia_ObjIsCi(pVar) )
//            Vec_IntPush( vCex, Abc_Var2Lit(Gia_ObjId(p->pAig,pVar), !Cbs0_VarValue(pVar)) );
            Vec_IntPush( vCex, Abc_Var2Lit(Gia_ObjCioId(pVar), !Cbs0_VarValue(pVar)) );
} 

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_QueIsEmpty( Cbs0_Que_t * p )
{
    return p->iHead == p->iTail;
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_QuePush( Cbs0_Que_t * p, Gia_Obj_t * pObj )
{
    if ( p->iTail == p->nSize )
    {
        p->nSize *= 2;
        p->pData = ABC_REALLOC( Gia_Obj_t *, p->pData, p->nSize ); 
    }
    p->pData[p->iTail++] = pObj;
}

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

  Synopsis    [Returns 1 if the object in the queue.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_QueHasNode( Cbs0_Que_t * p, Gia_Obj_t * pObj )
{
    Gia_Obj_t * pTemp;
    int i;
    Cbs0_QueForEachEntry( *p, pTemp, i )
        if ( pTemp == pObj )
            return 1;
    return 0;
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_QueStore( Cbs0_Que_t * p, int * piHeadOld, int * piTailOld )
{
    int i;
    *piHeadOld = p->iHead;
    *piTailOld = p->iTail;
    for ( i = *piHeadOld; i < *piTailOld; i++ )
        Cbs0_QuePush( p, p->pData[i] );
    p->iHead = *piTailOld;
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_QueRestore( Cbs0_Que_t * p, int iHeadOld, int iTailOld )
{
    p->iHead = iHeadOld;
    p->iTail = iTailOld;
}


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

  Synopsis    [Max number of fanins fanouts.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_VarFaninFanoutMax( Cbs0_Man_t * p, Gia_Obj_t * pObj )
{
    int Count0, Count1;
    assert( !Gia_IsComplement(pObj) );
    assert( Gia_ObjIsAnd(pObj) );
    Count0 = Gia_ObjRefNum( p->pAig, Gia_ObjFanin0(pObj) );
    Count1 = Gia_ObjRefNum( p->pAig, Gia_ObjFanin1(pObj) );
    return Abc_MaxInt( Count0, Count1 );
}

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

  Synopsis    [Find variable with the highest ID.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline Gia_Obj_t * Cbs0_ManDecideHighest( Cbs0_Man_t * p )
{
    Gia_Obj_t * pObj, * pObjMax = NULL;
    int i;
    Cbs0_QueForEachEntry( p->pJust, pObj, i )
        if ( pObjMax == NULL || pObjMax < pObj )
            pObjMax = pObj;
    return pObjMax;
}

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

  Synopsis    [Find variable with the lowest ID.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline Gia_Obj_t * Cbs0_ManDecideLowest( Cbs0_Man_t * p )
{
    Gia_Obj_t * pObj, * pObjMin = NULL;
    int i;
    Cbs0_QueForEachEntry( p->pJust, pObj, i )
        if ( pObjMin == NULL || pObjMin > pObj )
            pObjMin = pObj;
    return pObjMin;
}

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

  Synopsis    [Find variable with the maximum number of fanin fanouts.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline Gia_Obj_t * Cbs0_ManDecideMaxFF( Cbs0_Man_t * p )
{
    Gia_Obj_t * pObj, * pObjMax = NULL;
    int i, iMaxFF = 0, iCurFF;
    assert( p->pAig->pRefs != NULL );
    Cbs0_QueForEachEntry( p->pJust, pObj, i )
    {
        iCurFF = Cbs0_VarFaninFanoutMax( p, pObj );
        assert( iCurFF > 0 );
        if ( iMaxFF < iCurFF )
        {
            iMaxFF = iCurFF;
            pObjMax = pObj;
        }
    }
    return pObjMax;
}



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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_ManCancelUntil( Cbs0_Man_t * p, int iBound )
{
    Gia_Obj_t * pVar;
    int i;
    assert( iBound <= p->pProp.iTail );
    p->pProp.iHead = iBound;
    Cbs0_QueForEachEntry( p->pProp, pVar, i )
        Cbs0_VarUnassign( pVar );
    p->pProp.iTail = iBound;
}

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

  Synopsis    [Assigns the variables a value.]

  Description [Returns 1 if conflict; 0 if no conflict.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline void Cbs0_ManAssign( Cbs0_Man_t * p, Gia_Obj_t * pObj )
{
    Gia_Obj_t * pObjR = Gia_Regular(pObj);
    assert( Gia_ObjIsCand(pObjR) );
    assert( !Cbs0_VarIsAssigned(pObjR) );
    Cbs0_VarAssign( pObjR );
    Cbs0_VarSetValue( pObjR, !Gia_IsComplement(pObj) );
    Cbs0_QuePush( &p->pProp, pObjR );
}

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

  Synopsis    [Propagates a variable.]

  Description [Returns 1 if conflict; 0 if no conflict.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_ManPropagateOne( Cbs0_Man_t * p, Gia_Obj_t * pVar )
{
    int Value0, Value1;
    assert( !Gia_IsComplement(pVar) );
    assert( Cbs0_VarIsAssigned(pVar) );
    if ( Gia_ObjIsCi(pVar) )
        return 0;
    assert( Gia_ObjIsAnd(pVar) );
    Value0 = Cbs0_VarFanin0Value(pVar);
    Value1 = Cbs0_VarFanin1Value(pVar);
    if ( Cbs0_VarValue(pVar) )
    { // value is 1
        if ( Value0 == 0 || Value1 == 0 ) // one is 0
            return 1;
        if ( Value0 == 2 ) // first is unassigned
            Cbs0_ManAssign( p, Gia_ObjChild0(pVar) );
        if ( Value1 == 2 ) // first is unassigned
            Cbs0_ManAssign( p, Gia_ObjChild1(pVar) );
        return 0;
    }
    // value is 0
    if ( Value0 == 0 || Value1 == 0 ) // one is 0
        return 0;
    if ( Value0 == 1 && Value1 == 1 ) // both are 1
        return 1;
    if ( Value0 == 1 || Value1 == 1 ) // one is 1 
    {
        if ( Value0 == 2 ) // first is unassigned
            Cbs0_ManAssign( p, Gia_Not(Gia_ObjChild0(pVar)) );
        if ( Value1 == 2 ) // first is unassigned
            Cbs0_ManAssign( p, Gia_Not(Gia_ObjChild1(pVar)) );
        return 0;
    }
    assert( Cbs0_VarIsJust(pVar) );
    assert( !Cbs0_QueHasNode( &p->pJust, pVar ) );
    Cbs0_QuePush( &p->pJust, pVar );
    return 0;
}

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

  Synopsis    [Propagates a variable.]

  Description [Returns 1 if conflict; 0 if no conflict.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int Cbs0_ManPropagateTwo( Cbs0_Man_t * p, Gia_Obj_t * pVar )
{
    int Value0, Value1;
    assert( !Gia_IsComplement(pVar) );
    assert( Gia_ObjIsAnd(pVar) );
    assert( Cbs0_VarIsAssigned(pVar) );
    assert( !Cbs0_VarValue(pVar) );
    Value0 = Cbs0_VarFanin0Value(pVar);
    Value1 = Cbs0_VarFanin1Value(pVar);
    // value is 0
    if ( Value0 == 0 || Value1 == 0 ) // one is 0
        return 0;
    if ( Value0 == 1 && Value1 == 1 ) // both are 1
        return 1;
    assert( Value0 == 1 || Value1 == 1 );
    if ( Value0 == 2 ) // first is unassigned
        Cbs0_ManAssign( p, Gia_Not(Gia_ObjChild0(pVar)) );
    if ( Value1 == 2 ) // first is unassigned
        Cbs0_ManAssign( p, Gia_Not(Gia_ObjChild1(pVar)) );
    return 0;
}

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

  Synopsis    [Propagates all variables.]

  Description [Returns 1 if conflict; 0 if no conflict.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Cbs0_ManPropagate( Cbs0_Man_t * p )
{
    Gia_Obj_t * pVar;
    int i, k;
    while ( 1 )
    {
        Cbs0_QueForEachEntry( p->pProp, pVar, i )
        {
            if ( Cbs0_ManPropagateOne( p, pVar ) )
                return 1;
        }
        p->pProp.iHead = p->pProp.iTail;
        k = p->pJust.iHead;
        Cbs0_QueForEachEntry( p->pJust, pVar, i )
        {
            if ( Cbs0_VarIsJust( pVar ) )
                p->pJust.pData[k++] = pVar;
            else if ( Cbs0_ManPropagateTwo( p, pVar ) )
                return 1;
        }
        if ( k == p->pJust.iTail )
            break;
        p->pJust.iTail = k;
    }
    return 0;
}

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

  Synopsis    [Solve the problem recursively.]

  Description [Returns 1 if unsat or undecided; 0 if satisfiable.]
               
  SideEffects []

  SeeAlso     []
 
***********************************************************************/
int Cbs0_ManSolve_rec( Cbs0_Man_t * p )
{
    Gia_Obj_t * pVar, * pDecVar;
    int iPropHead, iJustHead, iJustTail;
    // propagate assignments
    assert( !Cbs0_QueIsEmpty(&p->pProp) );
    if ( Cbs0_ManPropagate( p ) )
        return 1;
    // check for satisfying assignment
    assert( Cbs0_QueIsEmpty(&p->pProp) );
    if ( Cbs0_QueIsEmpty(&p->pJust) )
        return 0;
    // quit using resource limits
    p->Pars.nJustThis = Abc_MaxInt( p->Pars.nJustThis, p->pJust.iTail - p->pJust.iHead );
    if ( Cbs0_ManCheckLimits( p ) )
        return 0;
    // remember the state before branching
    iPropHead = p->pProp.iHead;
    Cbs0_QueStore( &p->pJust, &iJustHead, &iJustTail );
    // find the decision variable
    if ( p->Pars.fUseHighest )
        pVar = Cbs0_ManDecideHighest( p );
    else if ( p->Pars.fUseLowest )
        pVar = Cbs0_ManDecideLowest( p );
    else if ( p->Pars.fUseMaxFF )
        pVar = Cbs0_ManDecideMaxFF( p );
    else assert( 0 );
    assert( Cbs0_VarIsJust( pVar ) );
    // chose decision variable using fanout count
    if ( Gia_ObjRefNum(p->pAig, Gia_ObjFanin0(pVar)) > Gia_ObjRefNum(p->pAig, Gia_ObjFanin1(pVar)) )
        pDecVar = Gia_Not(Gia_ObjChild0(pVar));
    else
        pDecVar = Gia_Not(Gia_ObjChild1(pVar));
    // decide on first fanin
    Cbs0_ManAssign( p, pDecVar );
    if ( !Cbs0_ManSolve_rec( p ) )
        return 0;
    Cbs0_ManCancelUntil( p, iPropHead );
    Cbs0_QueRestore( &p->pJust, iJustHead, iJustTail );
    // decide on second fanin
    Cbs0_ManAssign( p, Gia_Not(pDecVar) );
    if ( !Cbs0_ManSolve_rec( p ) )
        return 0;
    p->Pars.nBTThis++;
    return 1;
}

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

  Synopsis    [Looking for a satisfying assignment of the node.]

  Description [Assumes that each node has flag pObj->fMark0 set to 0.
  Returns 1 if unsatisfiable, 0 if satisfiable, and -1 if undecided.
  The node may be complemented. ]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Cbs0_ManSolve( Cbs0_Man_t * p, Gia_Obj_t * pObj )
{
    int RetValue;
    assert( !p->pProp.iHead && !p->pProp.iTail );
    assert( !p->pJust.iHead && !p->pJust.iTail );
    p->Pars.nBTThis = p->Pars.nJustThis = 0;
    Cbs0_ManAssign( p, pObj );
    RetValue = Cbs0_ManSolve_rec( p );
    if ( RetValue == 0 && !Cbs0_ManCheckLimits(p) )
        Cbs0_ManSaveModel( p, p->vModel );
    Cbs0_ManCancelUntil( p, 0 );
    p->pJust.iHead = p->pJust.iTail = 0;
    p->Pars.nBTTotal += p->Pars.nBTThis;
    p->Pars.nJustTotal = Abc_MaxInt( p->Pars.nJustTotal, p->Pars.nJustThis );
    if ( Cbs0_ManCheckLimits( p ) )
        RetValue = -1;
//    printf( "Outcome = %2d.  Confs = %6d.  Decision level max = %3d.\n", 
//        RetValue, p->Pars.nBTThis, p->DecLevelMax );
    return RetValue;
}

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

  Synopsis    [Prints statistics of the manager.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Cbs0_ManSatPrintStats( Cbs0_Man_t * p )
{
    printf( "CO = %8d  ", Gia_ManCoNum(p->pAig) );
    printf( "AND = %8d  ", Gia_ManAndNum(p->pAig) );
    printf( "Conf = %6d  ", p->Pars.nBTLimit );
    printf( "JustMax = %5d  ", p->Pars.nJustLimit );
    printf( "\n" );
    printf( "Unsat calls %6d  (%6.2f %%)   Ave conf = %8.1f   ", 
        p->nSatUnsat, p->nSatTotal? 100.0*p->nSatUnsat/p->nSatTotal :0.0, p->nSatUnsat? 1.0*p->nConfUnsat/p->nSatUnsat :0.0 );
    ABC_PRTP( "Time", p->timeSatUnsat, p->timeTotal );
    printf( "Sat   calls %6d  (%6.2f %%)   Ave conf = %8.1f   ", 
        p->nSatSat,   p->nSatTotal? 100.0*p->nSatSat/p->nSatTotal :0.0, p->nSatSat? 1.0*p->nConfSat/p->nSatSat : 0.0 );
    ABC_PRTP( "Time", p->timeSatSat,   p->timeTotal );
    printf( "Undef calls %6d  (%6.2f %%)   Ave conf = %8.1f   ", 
        p->nSatUndec, p->nSatTotal? 100.0*p->nSatUndec/p->nSatTotal :0.0, p->nSatUndec? 1.0*p->nConfUndec/p->nSatUndec : 0.0 );
    ABC_PRTP( "Time", p->timeSatUndec, p->timeTotal );
    ABC_PRT( "Total time", p->timeTotal );
}

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

  Synopsis    [Procedure to test the new SAT solver.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Vec_Int_t * Cbs_ManSolveMiter( Gia_Man_t * pAig, int nConfs, Vec_Str_t ** pvStatus, int fVerbose )
{
    extern void Cec_ManSatAddToStore( Vec_Int_t * vCexStore, Vec_Int_t * vCex, int Out );
    Cbs0_Man_t * p; 
    Vec_Int_t * vCex, * vVisit, * vCexStore;
    Vec_Str_t * vStatus;
    Gia_Obj_t * pRoot; 
    int i, status;
    clock_t clk, clkTotal = clock();
    assert( Gia_ManRegNum(pAig) == 0 );
    // prepare AIG
    Gia_ManCreateRefs( pAig );
    Gia_ManCleanMark0( pAig );
    Gia_ManCleanMark1( pAig );
    // create logic network
    p = Cbs0_ManAlloc();
    p->Pars.nBTLimit = nConfs;
    p->pAig   = pAig;
    // create resulting data-structures
    vStatus   = Vec_StrAlloc( Gia_ManPoNum(pAig) );
    vCexStore = Vec_IntAlloc( 10000 );
    vVisit    = Vec_IntAlloc( 100 );
    vCex      = Cbs0_ReadModel( p );
    // solve for each output
    Gia_ManForEachCo( pAig, pRoot, i )
    {
        Vec_IntClear( vCex );
        if ( Gia_ObjIsConst0(Gia_ObjFanin0(pRoot)) )
        {
            if ( Gia_ObjFaninC0(pRoot) )
            {
                printf( "Constant 1 output of SRM!!!\n" );
                Cec_ManSatAddToStore( vCexStore, vCex, i ); // trivial counter-example
                Vec_StrPush( vStatus, 0 );
            }
            else
            {
//                printf( "Constant 0 output of SRM!!!\n" );
                Vec_StrPush( vStatus, 1 );
            }
            continue;
        }
        clk = clock();
        p->Pars.fUseHighest = 1;
        p->Pars.fUseLowest  = 0;
        status = Cbs0_ManSolve( p, Gia_ObjChild0(pRoot) );
/*
        if ( status == -1 )
        {
            p->Pars.fUseHighest = 0;
            p->Pars.fUseLowest  = 1;
            status = Cbs0_ManSolve( p, Gia_ObjChild0(pRoot) );
        }
*/
        Vec_StrPush( vStatus, (char)status );
        if ( status == -1 )
        {
            p->nSatUndec++;
            p->nConfUndec += p->Pars.nBTThis;
            Cec_ManSatAddToStore( vCexStore, NULL, i ); // timeout
            p->timeSatUndec += clock() - clk;
            continue;
        }
        if ( status == 1 )
        {
            p->nSatUnsat++;
            p->nConfUnsat += p->Pars.nBTThis;
            p->timeSatUnsat += clock() - clk;
            continue;
        }
        p->nSatSat++;
        p->nConfSat += p->Pars.nBTThis;
//        Gia_SatVerifyPattern( pAig, pRoot, vCex, vVisit );
        Cec_ManSatAddToStore( vCexStore, vCex, i );
        p->timeSatSat += clock() - clk;
    }
    Vec_IntFree( vVisit );
    p->nSatTotal = Gia_ManPoNum(pAig);
    p->timeTotal = clock() - clkTotal;
    if ( fVerbose )
        Cbs0_ManSatPrintStats( p );
    Cbs0_ManStop( p );
    *pvStatus = vStatus;
//    printf( "Total number of cex literals = %d. (Ave = %d)\n", 
//         Vec_IntSize(vCexStore)-2*p->nSatUndec-2*p->nSatSat, 
//        (Vec_IntSize(vCexStore)-2*p->nSatUndec-2*p->nSatSat)/p->nSatSat );
    return vCexStore;
}


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


ABC_NAMESPACE_IMPL_END