summaryrefslogtreecommitdiffstats
path: root/src/map/if/ifMap.c
blob: 759ae9be47ff94da64742ad09d6bd806ed83baef (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
/**CFile****************************************************************

  FileName    [ifMap.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [FPGA mapping based on priority cuts.]

  Synopsis    [Mapping procedures.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 1.0. Started - November 21, 2006.]

  Revision    [$Id: ifMap.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]

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

#include "if.h"
#include "misc/extra/extra.h"

ABC_NAMESPACE_IMPL_START

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

extern char * Dau_DsdMerge( char * pDsd0i, int * pPerm0, char * pDsd1i, int * pPerm1, int fCompl0, int fCompl1, int nVars );
extern int    If_CutDelayRecCost3( If_Man_t* p, If_Cut_t* pCut, If_Obj_t * pObj );
extern int    Abc_ExactDelayCost( word * pTruth, int nVars, int * pArrTimeProfile, char * pPerm, int * Cost, int AigLevel );

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

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

  Synopsis    [Compute delay of the cut's output in terms of logic levels.]

  Description [Uses the best arrival time of the fanins of the cut
  to compute the arrival times of the output of the cut.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int If_ManCutAigDelay_rec( If_Man_t * p, If_Obj_t * pObj, Vec_Ptr_t * vVisited )
{
    int Delay0, Delay1;
    if ( pObj->fVisit )
        return pObj->iCopy;
    if ( If_ObjIsCi(pObj) || If_ObjIsConst1(pObj) )
        return -1;
    // store the node in the structure by level
    assert( If_ObjIsAnd(pObj) );
    pObj->fVisit = 1;
    Vec_PtrPush( vVisited, pObj );
    Delay0 = If_ManCutAigDelay_rec( p, pObj->pFanin0, vVisited );
    Delay1 = If_ManCutAigDelay_rec( p, pObj->pFanin1, vVisited );
    pObj->iCopy = (Delay0 >= 0 && Delay1 >= 0) ? 1 + Abc_MaxInt(Delay0, Delay1) : -1;
    return pObj->iCopy;
}
int If_ManCutAigDelay( If_Man_t * p, If_Obj_t * pObj, If_Cut_t * pCut )
{
    If_Obj_t * pLeaf;
    int i, Delay;
    Vec_PtrClear( p->vVisited );
    If_CutForEachLeaf( p, pCut, pLeaf, i )
    {
        assert( pLeaf->fVisit == 0 );
        pLeaf->fVisit = 1;
        Vec_PtrPush( p->vVisited, pLeaf );
        pLeaf->iCopy = If_ObjCutBest(pLeaf)->Delay;
    }
    Delay = If_ManCutAigDelay_rec( p, pObj, p->vVisited );
    Vec_PtrForEachEntry( If_Obj_t *, p->vVisited, pLeaf, i )
        pLeaf->fVisit = 0;
//    assert( Delay <= (int)pObj->Level );
    return Delay;
}

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

  Synopsis    [Counts the number of 1s in the signature.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
static inline int If_WordCountOnes( unsigned uWord )
{
    uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
    uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
    uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
    uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
    return  (uWord & 0x0000FFFF) + (uWord>>16);
}

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

  Synopsis    [Counts the number of 1s in the signature.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
float If_CutDelaySpecial( If_Man_t * p, If_Cut_t * pCut, int fCarry )
{
    static float Pin2Pin[2][3] = { {1.0, 1.0, 1.0}, {1.0, 1.0, 0.0} };
    If_Obj_t * pLeaf;
    float DelayCur, Delay = -IF_FLOAT_LARGE;
    int i;
    assert( pCut->nLeaves <= 3 );
    If_CutForEachLeaf( p, pCut, pLeaf, i )
    {
        DelayCur = If_ObjCutBest(pLeaf)->Delay;
        Delay = IF_MAX( Delay, Pin2Pin[fCarry][i] + DelayCur );
    }
    return Delay;
}

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

  Synopsis    [Returns arrival time profile of the cut.]

  Description [The procedure returns static storage, which should not be
  deallocated and is only valid until before the procedure is called again.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int * If_CutArrTimeProfile( If_Man_t * p, If_Cut_t * pCut )
{
    int i;
    for ( i = 0; i < If_CutLeaveNum(pCut); i++ )
        p->pArrTimeProfile[i] = (int)If_ObjCutBest(If_CutLeaf(p, pCut, i))->Delay;
    return p->pArrTimeProfile;
}

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

  Synopsis    [Finds the best cut for the given node.]

  Description [Mapping modes: delay (0), area flow (1), area (2).]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void If_ObjPerformMappingAnd( If_Man_t * p, If_Obj_t * pObj, int Mode, int fPreprocess, int fFirst )
{
    If_Set_t * pCutSet;
    If_Cut_t * pCut0, * pCut1, * pCut;
    If_Cut_t * pCut0R, * pCut1R;
    int fFunc0R, fFunc1R;
    int i, k, v, iCutDsd, fChange;
    int fSave0 = p->pPars->fDelayOpt || p->pPars->fDelayOptLut || p->pPars->fDsdBalance || p->pPars->fUserRecLib || p->pPars->fUserSesLib || 
        p->pPars->fUseDsdTune || p->pPars->fUseCofVars || p->pPars->fUseAndVars || p->pPars->fUse34Spec || p->pPars->pLutStruct || p->pPars->pFuncCell2;
    int fUseAndCut = (p->pPars->nAndDelay > 0) || (p->pPars->nAndArea > 0);
    assert( !If_ObjIsAnd(pObj->pFanin0) || pObj->pFanin0->pCutSet->nCuts > 0 );
    assert( !If_ObjIsAnd(pObj->pFanin1) || pObj->pFanin1->pCutSet->nCuts > 0 );

    // prepare
    if ( Mode == 0 )
        pObj->EstRefs = (float)pObj->nRefs;
    else if ( Mode == 1 )
        pObj->EstRefs = (float)((2.0 * pObj->EstRefs + pObj->nRefs) / 3.0);
    // deref the selected cut
    if ( Mode && pObj->nRefs > 0 )
        If_CutAreaDeref( p, If_ObjCutBest(pObj) );

    // prepare the cutset
    pCutSet = If_ManSetupNodeCutSet( p, pObj );

    // get the current assigned best cut
    pCut = If_ObjCutBest(pObj);
    if ( !fFirst )
    {
        // recompute the parameters of the best cut
        if ( p->pPars->fDelayOpt )
            pCut->Delay = If_CutSopBalanceEval( p, pCut, NULL );
        else if ( p->pPars->fDsdBalance )
            pCut->Delay = If_CutDsdBalanceEval( p, pCut, NULL );
        else if ( p->pPars->fUserRecLib )
            pCut->Delay = If_CutDelayRecCost3( p, pCut, pObj ); 
        else if ( p->pPars->fUserSesLib )
        {
            int Cost = 0;
            pCut->fUser = 1;
            pCut->Delay = (float)Abc_ExactDelayCost( If_CutTruthW(p, pCut), If_CutLeaveNum(pCut), If_CutArrTimeProfile(p, pCut), If_CutPerm(pCut), &Cost, If_ManCutAigDelay(p, pObj, pCut) ); 
            if ( Cost == ABC_INFINITY )
            {
                for ( v = 0; v < If_CutLeaveNum(pCut); v++ )
                    If_CutPerm(pCut)[v] = IF_BIG_CHAR;
                pCut->Cost = IF_COST_MAX;
                pCut->fUseless = 1;
            }
        }
        else if ( p->pPars->fDelayOptLut )
            pCut->Delay = If_CutLutBalanceEval( p, pCut );
        else if( p->pPars->nGateSize > 0 )
            pCut->Delay = If_CutDelaySop( p, pCut );
        else
            pCut->Delay = If_CutDelay( p, pObj, pCut );
        assert( pCut->Delay != -1 );
//        assert( pCut->Delay <= pObj->Required + p->fEpsilon );
        if ( pCut->Delay > pObj->Required + 2*p->fEpsilon )
            Abc_Print( 1, "If_ObjPerformMappingAnd(): Warning! Node with ID %d has delay (%f) exceeding the required times (%f).\n", 
                pObj->Id, pCut->Delay, pObj->Required + p->fEpsilon );
        pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
        if ( p->pPars->fEdge )
            pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
        if ( p->pPars->fPower )
            pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
        // save the best cut from the previous iteration
        if ( !fPreprocess )
            If_CutCopy( p, pCutSet->ppCuts[pCutSet->nCuts++], pCut );
    }

    // generate cuts
    If_ObjForEachCut( pObj->pFanin0, pCut0, i )
    If_ObjForEachCut( pObj->pFanin1, pCut1, k )
    {
        // get the next free cut
        assert( pCutSet->nCuts <= pCutSet->nCutsMax );
        pCut = pCutSet->ppCuts[pCutSet->nCuts];
        // make sure K-feasible cut exists
        if ( If_WordCountOnes(pCut0->uSign | pCut1->uSign) > p->pPars->nLutSize )
            continue;

        pCut0R = pCut0;
        pCut1R = pCut1;
        fFunc0R = pCut0->iCutFunc ^ pCut0->fCompl ^ pObj->fCompl0;
        fFunc1R = pCut1->iCutFunc ^ pCut1->fCompl ^ pObj->fCompl1;
        if ( !p->pPars->fUseTtPerm || pCut0->nLeaves > pCut1->nLeaves || (pCut0->nLeaves == pCut1->nLeaves && fFunc0R > fFunc1R) )
        {
        }
        else
        {
            ABC_SWAP( If_Cut_t *, pCut0R, pCut1R );
            ABC_SWAP( int, fFunc0R, fFunc1R );
        }        

        // merge the cuts
        if ( p->pPars->fUseTtPerm )
        {
            if ( !If_CutMerge( p, pCut0R, pCut1R, pCut ) )
                continue;
        }
        else
        {
            if ( !If_CutMergeOrdered( p, pCut0, pCut1, pCut ) )
                continue;
        }
        if ( pObj->fSpec && pCut->nLeaves == (unsigned)p->pPars->nLutSize )
            continue;
        p->nCutsMerged++;
        p->nCutsTotal++;
        // check if this cut is contained in any of the available cuts
        if ( !p->pPars->fSkipCutFilter && If_CutFilter( pCutSet, pCut, fSave0 ) )
            continue;
        // check if the cut is a special AND-gate cut
        pCut->fAndCut = fUseAndCut && pCut->nLeaves == 2 && pCut->pLeaves[0] == pObj->pFanin0->Id && pCut->pLeaves[1] == pObj->pFanin1->Id;
        //assert( pCut->nLeaves != 2 || pCut->pLeaves[0] < pCut->pLeaves[1] );
        //assert( pCut->nLeaves != 2 || pObj->pFanin0->Id < pObj->pFanin1->Id );
        // compute the truth table
        pCut->iCutFunc = -1;
        pCut->fCompl = 0;
        if ( p->pPars->fTruth )
        {
//            int nShared = pCut0->nLeaves + pCut1->nLeaves - pCut->nLeaves;
            abctime clk = 0;
            if ( p->pPars->fVerbose )
                clk = Abc_Clock();
            if ( p->pPars->fUseTtPerm )
                fChange = If_CutComputeTruthPerm( p, pCut, pCut0R, pCut1R, fFunc0R, fFunc1R );
            else
                fChange = If_CutComputeTruth( p, pCut, pCut0, pCut1, pObj->fCompl0, pObj->fCompl1 );
            if ( p->pPars->fVerbose )
                p->timeCache[4] += Abc_Clock() - clk;
            if ( !p->pPars->fSkipCutFilter && fChange && If_CutFilter( pCutSet, pCut, fSave0 ) )
                continue;
            if ( p->pPars->fLut6Filter && pCut->nLeaves == 6 && !If_CutCheckTruth6(p, pCut) )
                continue;
            if ( p->pPars->fUseDsd )
            {
                extern void If_ManCacheRecord( If_Man_t * p, int iDsd0, int iDsd1, int nShared, int iDsd );
                int truthId = Abc_Lit2Var(pCut->iCutFunc);
                if ( truthId >= Vec_IntSize(p->vTtDsds[pCut->nLeaves]) || Vec_IntEntry(p->vTtDsds[pCut->nLeaves], truthId) == -1 )
                {
                    while ( truthId >= Vec_IntSize(p->vTtDsds[pCut->nLeaves]) )
                    {
                        Vec_IntPush( p->vTtDsds[pCut->nLeaves], -1 );
                        for ( v = 0; v < Abc_MaxInt(6, pCut->nLeaves); v++ )
                            Vec_StrPush( p->vTtPerms[pCut->nLeaves], IF_BIG_CHAR );
                    }
                    iCutDsd = If_DsdManCompute( p->pIfDsdMan, If_CutTruthWR(p, pCut), pCut->nLeaves, (unsigned char *)If_CutDsdPerm(p, pCut), p->pPars->pLutStruct );
                    Vec_IntWriteEntry( p->vTtDsds[pCut->nLeaves], truthId, iCutDsd );
                }
                assert( If_DsdManSuppSize(p->pIfDsdMan, If_CutDsdLit(p, pCut)) == (int)pCut->nLeaves );
                //If_ManCacheRecord( p, If_CutDsdLit(p, pCut0), If_CutDsdLit(p, pCut1), nShared, If_CutDsdLit(p, pCut) );
            }
            // run user functions
            pCut->fUseless = 0;
            if ( p->pPars->pFuncCell || p->pPars->pFuncCell2 )
            {
                assert( p->pPars->fUseTtPerm == 0 );
                assert( pCut->nLimit >= 4 && pCut->nLimit <= 16 );
                if ( p->pPars->fUseDsd )
                    pCut->fUseless = If_DsdManCheckDec( p->pIfDsdMan, If_CutDsdLit(p, pCut) );
                else if ( p->pPars->pFuncCell2 )
                    pCut->fUseless = !p->pPars->pFuncCell2( p, (word *)If_CutTruthW(p, pCut), pCut->nLeaves, NULL, NULL );
                else
                    pCut->fUseless = !p->pPars->pFuncCell( p, If_CutTruth(p, pCut), Abc_MaxInt(6, pCut->nLeaves), pCut->nLeaves, p->pPars->pLutStruct );
                p->nCutsUselessAll += pCut->fUseless;
                p->nCutsUseless[pCut->nLeaves] += pCut->fUseless;
                p->nCutsCountAll++;
                p->nCutsCount[pCut->nLeaves]++;
                // skip 5-input cuts, which cannot be decomposed
                if ( (p->pPars->fEnableCheck75 || p->pPars->fEnableCheck75u) && pCut->nLeaves == 5 && pCut->nLimit == 5 )
                {
                    extern int If_CluCheckDecInAny( word t, int nVars );
                    extern int If_CluCheckDecOut( word t, int nVars );
                    unsigned TruthU = *If_CutTruth(p, pCut);
                    word Truth = (((word)TruthU << 32) | (word)TruthU);
                    p->nCuts5++;
                    if ( If_CluCheckDecInAny( Truth, 5 ) )
                        p->nCuts5a++;
                    else
                        continue;
                }
                else if ( p->pPars->fVerbose && pCut->nLeaves == 5 )
                {
                    extern int If_CluCheckDecInAny( word t, int nVars );
                    extern int If_CluCheckDecOut( word t, int nVars );
                    unsigned TruthU = *If_CutTruth(p, pCut);
                    word Truth = (((word)TruthU << 32) | (word)TruthU);
                    p->nCuts5++;
                    if ( If_CluCheckDecInAny( Truth, 5 ) || If_CluCheckDecOut( Truth, 5 ) )
                        p->nCuts5a++;
                }
            }
            else if ( p->pPars->fUseDsdTune )
            {
                pCut->fUseless = If_DsdManReadMark( p->pIfDsdMan, If_CutDsdLit(p, pCut) );
                p->nCutsUselessAll += pCut->fUseless;
                p->nCutsUseless[pCut->nLeaves] += pCut->fUseless;
                p->nCutsCountAll++;
                p->nCutsCount[pCut->nLeaves]++;
            }
            else if ( p->pPars->fUse34Spec )
            {
                assert( pCut->nLeaves <= 4 );
                if ( pCut->nLeaves == 4 && !Abc_Tt4Check( (int)(0xFFFF & *If_CutTruth(p, pCut)) ) )
                    pCut->fUseless = 1;
            }
            else 
            {
                if ( p->pPars->fUseAndVars )
                {
                    int iDecMask = -1, truthId = Abc_Lit2Var(pCut->iCutFunc);
                    assert( p->pPars->nLutSize <= 13 );
                    if ( truthId >= Vec_IntSize(p->vTtDecs[pCut->nLeaves]) || Vec_IntEntry(p->vTtDecs[pCut->nLeaves], truthId) == -1 )
                    {
                        while ( truthId >= Vec_IntSize(p->vTtDecs[pCut->nLeaves]) )
                            Vec_IntPush( p->vTtDecs[pCut->nLeaves], -1 );
                        if ( (int)pCut->nLeaves > p->pPars->nLutSize / 2 && (int)pCut->nLeaves <= 2 * (p->pPars->nLutSize / 2) )
                            iDecMask = Abc_TtProcessBiDec( If_CutTruthWR(p, pCut), (int)pCut->nLeaves, p->pPars->nLutSize / 2 );
                        else
                            iDecMask = 0;
                        Vec_IntWriteEntry( p->vTtDecs[pCut->nLeaves], truthId, iDecMask );
                    }
                    iDecMask = Vec_IntEntry(p->vTtDecs[pCut->nLeaves], truthId);
                    assert( iDecMask >= 0 );
                    pCut->fUseless = (int)(iDecMask == 0 && (int)pCut->nLeaves > p->pPars->nLutSize / 2);
                    p->nCutsUselessAll += pCut->fUseless;
                    p->nCutsUseless[pCut->nLeaves] += pCut->fUseless;
                    p->nCutsCountAll++;
                    p->nCutsCount[pCut->nLeaves]++;
                }
                if ( p->pPars->fUseCofVars && (!p->pPars->fUseAndVars || pCut->fUseless) )
                {
                    int iCofVar = -1, truthId = Abc_Lit2Var(pCut->iCutFunc);
                    if ( truthId >= Vec_StrSize(p->vTtVars[pCut->nLeaves]) || Vec_StrEntry(p->vTtVars[pCut->nLeaves], truthId) == (char)-1 )
                    {
                        while ( truthId >= Vec_StrSize(p->vTtVars[pCut->nLeaves]) )
                            Vec_StrPush( p->vTtVars[pCut->nLeaves], (char)-1 );
                        iCofVar = Abc_TtCheckCondDep( If_CutTruthWR(p, pCut), pCut->nLeaves, p->pPars->nLutSize / 2 );
                        Vec_StrWriteEntry( p->vTtVars[pCut->nLeaves], truthId, (char)iCofVar );
                    }
                    iCofVar = Vec_StrEntry(p->vTtVars[pCut->nLeaves], truthId);
                    assert( iCofVar >= 0 && iCofVar <= (int)pCut->nLeaves );
                    pCut->fUseless = (int)(iCofVar == (int)pCut->nLeaves && pCut->nLeaves > 0);
                    p->nCutsUselessAll += pCut->fUseless;
                    p->nCutsUseless[pCut->nLeaves] += pCut->fUseless;
                    p->nCutsCountAll++;
                    p->nCutsCount[pCut->nLeaves]++;
                }
            }
        }
        
        // compute the application-specific cost and depth
        pCut->fUser = (p->pPars->pFuncCost != NULL);
        pCut->Cost = p->pPars->pFuncCost? p->pPars->pFuncCost(p, pCut) : 0;
        if ( pCut->Cost == IF_COST_MAX )
            continue;
        // check if the cut satisfies the required times
        if ( p->pPars->fDelayOpt )
            pCut->Delay = If_CutSopBalanceEval( p, pCut, NULL );
        else if ( p->pPars->fDsdBalance )
            pCut->Delay = If_CutDsdBalanceEval( p, pCut, NULL );
        else if ( p->pPars->fUserRecLib )
            pCut->Delay = If_CutDelayRecCost3( p, pCut, pObj ); 
        else if ( p->pPars->fUserSesLib )
        {
            int Cost = 0;
            pCut->fUser = 1;
            pCut->Delay = (float)Abc_ExactDelayCost( If_CutTruthW(p, pCut), If_CutLeaveNum(pCut), If_CutArrTimeProfile(p, pCut), If_CutPerm(pCut), &Cost, If_ManCutAigDelay(p, pObj, pCut) ); 
            if ( Cost == ABC_INFINITY )
            {
                for ( v = 0; v < If_CutLeaveNum(pCut); v++ )
                    If_CutPerm(pCut)[v] = IF_BIG_CHAR;
                pCut->Cost = IF_COST_MAX;
                pCut->fUseless = 1;
            }
        }
        else if ( p->pPars->fDelayOptLut )
            pCut->Delay = If_CutLutBalanceEval( p, pCut );
        else if( p->pPars->nGateSize > 0 )
            pCut->Delay = If_CutDelaySop( p, pCut );
        else 
            pCut->Delay = If_CutDelay( p, pObj, pCut );
        if ( pCut->Delay == -1 )
            continue;
        if ( Mode && pCut->Delay > pObj->Required + p->fEpsilon )
            continue;
        // compute area of the cut (this area may depend on the application specific cost)
        pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
        if ( p->pPars->fEdge )
            pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
        if ( p->pPars->fPower )
            pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
//        pCut->AveRefs = (Mode == 0)? (float)0.0 : If_CutAverageRefs( p, pCut );
        // insert the cut into storage
        If_CutSort( p, pCutSet, pCut );
//        If_CutTraverse( p, pObj, pCut );
    } 
    assert( pCutSet->nCuts > 0 );
//    If_CutVerifyCuts( pCutSet, !p->pPars->fUseTtPerm );

    // update the best cut
    if ( !fPreprocess || pCutSet->ppCuts[0]->Delay <= pObj->Required + p->fEpsilon )
    {
        If_CutCopy( p, If_ObjCutBest(pObj), pCutSet->ppCuts[0] );
        if ( p->pPars->fUserRecLib || p->pPars->fUserSesLib )
            assert(If_ObjCutBest(pObj)->Cost < IF_COST_MAX && If_ObjCutBest(pObj)->Delay < ABC_INFINITY);
    }
    // add the trivial cut to the set
    if ( !pObj->fSkipCut && If_ObjCutBest(pObj)->nLeaves > 1 )
    {
        If_ManSetupCutTriv( p, pCutSet->ppCuts[pCutSet->nCuts++], pObj->Id );
        assert( pCutSet->nCuts <= pCutSet->nCutsMax+1 );
    }
//    if ( If_ObjCutBest(pObj)->nLeaves == 0 )
//        p->nBestCutSmall[0]++;
//    else if ( If_ObjCutBest(pObj)->nLeaves == 1 )
//        p->nBestCutSmall[1]++;

    // ref the selected cut
    if ( Mode && pObj->nRefs > 0 )
        If_CutAreaRef( p, If_ObjCutBest(pObj) );
    if ( If_ObjCutBest(pObj)->fUseless )
        Abc_Print( 1, "The best cut is useless.\n" );
    // call the user specified function for each cut
    if ( p->pPars->pFuncUser )
        If_ObjForEachCut( pObj, pCut, i )
            p->pPars->pFuncUser( p, pObj, pCut );
    // free the cuts
    If_ManDerefNodeCutSet( p, pObj );
}

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

  Synopsis    [Finds the best cut for the choice node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void If_ObjPerformMappingChoice( If_Man_t * p, If_Obj_t * pObj, int Mode, int fPreprocess )
{
    If_Set_t * pCutSet;
    If_Obj_t * pTemp;
    If_Cut_t * pCutTemp, * pCut;
    int i, fSave0 = p->pPars->fDelayOpt || p->pPars->fDelayOptLut || p->pPars->fDsdBalance || p->pPars->fUserRecLib || p->pPars->fUserSesLib || p->pPars->fUse34Spec;
    assert( pObj->pEquiv != NULL );

    // prepare
    if ( Mode && pObj->nRefs > 0 )
        If_CutAreaDeref( p, If_ObjCutBest(pObj) );

    // remove elementary cuts
    for ( pTemp = pObj; pTemp; pTemp = pTemp->pEquiv )
        if ( pTemp != pObj || pTemp->pCutSet->nCuts > 1 )
            pTemp->pCutSet->nCuts--;

    // update the cutset of the node
    pCutSet = pObj->pCutSet;

    // generate cuts
    for ( pTemp = pObj->pEquiv; pTemp; pTemp = pTemp->pEquiv )
    {
        if ( pTemp->pCutSet->nCuts == 0 )
            continue;
        // go through the cuts of this node
        If_ObjForEachCut( pTemp, pCutTemp, i )
        {
            if ( pCutTemp->fUseless )
                continue;
            // get the next free cut
            assert( pCutSet->nCuts <= pCutSet->nCutsMax );
            pCut = pCutSet->ppCuts[pCutSet->nCuts];
            // copy the cut into storage
            If_CutCopy( p, pCut, pCutTemp );
            // check if this cut is contained in any of the available cuts
            if ( If_CutFilter( pCutSet, pCut, fSave0 ) )
                continue;
            // check if the cut satisfies the required times
//            assert( pCut->Delay == If_CutDelay( p, pTemp, pCut ) );
            if ( Mode && pCut->Delay > pObj->Required + p->fEpsilon )
                continue;
            // set the phase attribute
            pCut->fCompl = pObj->fPhase ^ pTemp->fPhase;
            // compute area of the cut (this area may depend on the application specific cost)
            pCut->Area = (Mode == 2)? If_CutAreaDerefed( p, pCut ) : If_CutAreaFlow( p, pCut );
            if ( p->pPars->fEdge )
                pCut->Edge = (Mode == 2)? If_CutEdgeDerefed( p, pCut ) : If_CutEdgeFlow( p, pCut );
            if ( p->pPars->fPower )
                pCut->Power = (Mode == 2)? If_CutPowerDerefed( p, pCut, pObj ) : If_CutPowerFlow( p, pCut, pObj );
//            pCut->AveRefs = (Mode == 0)? (float)0.0 : If_CutAverageRefs( p, pCut );
            // insert the cut into storage
            If_CutSort( p, pCutSet, pCut );
        }
    } 
    assert( pCutSet->nCuts > 0 );

    // update the best cut
    if ( !fPreprocess || pCutSet->ppCuts[0]->Delay <= pObj->Required + p->fEpsilon )
        If_CutCopy( p, If_ObjCutBest(pObj), pCutSet->ppCuts[0] );
    // add the trivial cut to the set
    if ( !pObj->fSkipCut && If_ObjCutBest(pObj)->nLeaves > 1 )
    {
        If_ManSetupCutTriv( p, pCutSet->ppCuts[pCutSet->nCuts++], pObj->Id );
        assert( pCutSet->nCuts <= pCutSet->nCutsMax+1 );
    }

    // ref the selected cut
    if ( Mode && pObj->nRefs > 0 )
        If_CutAreaRef( p, If_ObjCutBest(pObj) );
    // free the cuts
    If_ManDerefChoiceCutSet( p, pObj );
}

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

  Synopsis    [Performs one mapping pass over all nodes.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int If_ManPerformMappingRound( If_Man_t * p, int nCutsUsed, int Mode, int fPreprocess, int fFirst, char * pLabel )
{
    ProgressBar * pProgress = NULL;
    If_Obj_t * pObj;
    int i;
    abctime clk = Abc_Clock();
    float arrTime;
    assert( Mode >= 0 && Mode <= 2 );
    p->nBestCutSmall[0] = p->nBestCutSmall[1] = 0;
    // set the sorting function
    if ( Mode || p->pPars->fArea ) // area
        p->SortMode = 1;
    else if ( p->pPars->fFancy )
        p->SortMode = 2;
    else
        p->SortMode = 0;
    // set the cut number
    p->nCutsUsed   = nCutsUsed;
    p->nCutsMerged = 0;
    // make sure the visit counters are all zero
    If_ManForEachNode( p, pObj, i )
        assert( pObj->nVisits == pObj->nVisitsCopy );
    // map the internal nodes
    if ( p->pManTim != NULL )
    {
        Tim_ManIncrementTravId( p->pManTim );
        If_ManForEachObj( p, pObj, i )
        {
            if ( If_ObjIsAnd(pObj) )
            {
                If_ObjPerformMappingAnd( p, pObj, Mode, fPreprocess, fFirst );
                if ( pObj->fRepr )
                    If_ObjPerformMappingChoice( p, pObj, Mode, fPreprocess );
            }
            else if ( If_ObjIsCi(pObj) )
            {
//Abc_Print( 1, "processing CI %d\n", pObj->Id );
                arrTime = Tim_ManGetCiArrival( p->pManTim, pObj->IdPio );
                If_ObjSetArrTime( pObj, arrTime );
            }
            else if ( If_ObjIsCo(pObj) )
            {
                arrTime = If_ObjArrTime( If_ObjFanin0(pObj) );
                Tim_ManSetCoArrival( p->pManTim, pObj->IdPio, arrTime );
            }
            else if ( If_ObjIsConst1(pObj) )
            {
                arrTime = -IF_INFINITY;
                If_ObjSetArrTime( pObj, arrTime );
            }
            else
                assert( 0 );
        }
//        Tim_ManPrint( p->pManTim );
    }
    else
    {
        pProgress = Extra_ProgressBarStart( stdout, If_ManObjNum(p) );
        If_ManForEachNode( p, pObj, i )
        {
            Extra_ProgressBarUpdate( pProgress, i, pLabel );
            If_ObjPerformMappingAnd( p, pObj, Mode, fPreprocess, fFirst );
            if ( pObj->fRepr )
                If_ObjPerformMappingChoice( p, pObj, Mode, fPreprocess );
        }
    }
    Extra_ProgressBarStop( pProgress );
    // make sure the visit counters are all zero
    If_ManForEachNode( p, pObj, i )
        assert( pObj->nVisits == 0 );
    // compute required times and stats
    If_ManComputeRequired( p );
//    Tim_ManPrint( p->pManTim );
    if ( p->pPars->fVerbose )
    {
        char Symb = fPreprocess? 'P' : ((Mode == 0)? 'D' : ((Mode == 1)? 'F' : 'A'));
        Abc_Print( 1, "%c:  Del = %7.2f.  Ar = %9.1f.  Edge = %8d.  ", 
            Symb, p->RequiredGlo, p->AreaGlo, p->nNets );
        if ( p->dPower )
        Abc_Print( 1, "Switch = %7.2f.  ", p->dPower );
        Abc_Print( 1, "Cut = %8d.  ", p->nCutsMerged );
        Abc_PrintTime( 1, "T", Abc_Clock() - clk );
//    Abc_Print( 1, "Max number of cuts = %d. Average number of cuts = %5.2f.\n", 
//        p->nCutsMax, 1.0 * p->nCutsMerged / If_ManAndNum(p) );
    }
    return 1;
}


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


ABC_NAMESPACE_IMPL_END