summaryrefslogtreecommitdiffstats
path: root/src/base/abci/abcStrash.c
blob: b6aecef92f5f6fb2b7c7dc0dcb5eb27ba0549acc (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
/**CFile****************************************************************

  FileName    [abcStrash.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Strashing of the current network.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "abc.h"
#include "extra.h"
#include "dec.h"

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

static void Abc_NtkStrashPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew, bool fAllNodes );

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

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

  Synopsis    [Reapplies structural hashing to the AIG.]

  Description [Because of the structural hashing, this procedure should not 
  change the number of nodes. It is useful to detect the bugs in the original AIG.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkRestrash( Abc_Ntk_t * pNtk, bool fCleanup )
{
    extern int timeRetime;
    Abc_Ntk_t * pNtkAig;
    Abc_Obj_t * pObj;
    int i, nNodes;//, RetValue;
    assert( Abc_NtkIsStrash(pNtk) );
//timeRetime = clock();
    // print warning about choice nodes
    if ( Abc_NtkGetChoiceNum( pNtk ) )
        printf( "Warning: The choice nodes in the original AIG are removed by strashing.\n" );
    // start the new network (constants and CIs are already mappined after this step
    pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG );
    // restrash the nodes (assuming a topological order of the old network)
    Abc_NtkForEachNode( pNtk, pObj, i )
        pObj->pCopy = Abc_AigAnd( pNtkAig->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
    //l finalize the network
    Abc_NtkFinalize( pNtk, pNtkAig );
    // print warning about self-feed latches
//    if ( Abc_NtkCountSelfFeedLatches(pNtkAig) )
//        printf( "Warning: The network has %d self-feeding latches.\n", Abc_NtkCountSelfFeedLatches(pNtkAig) );
    // perform cleanup if requested
    if ( fCleanup && (nNodes = Abc_AigCleanup(pNtkAig->pManFunc)) ) 
        printf( "Abc_NtkRestrash(): AIG cleanup removed %d nodes (this is a bug).\n", nNodes );
    // duplicate EXDC 
    if ( pNtk->pExdc )
        pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
    // make sure everything is okay
    if ( !Abc_NtkCheck( pNtkAig ) )
    {
        printf( "Abc_NtkStrash: The network check has failed.\n" );
        Abc_NtkDelete( pNtkAig );
        return NULL;
    }
//timeRetime = clock() - timeRetime;
//    if ( RetValue = Abc_NtkRemoveSelfFeedLatches(pNtkAig) )
//        printf( "Modified %d self-feeding latches. The result will not verify.\n", RetValue );
    return pNtkAig;

}

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

  Synopsis    [Transforms logic network into structurally hashed AIG.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkStrash( Abc_Ntk_t * pNtk, bool fAllNodes, bool fCleanup )
{
    Abc_Ntk_t * pNtkAig;
    int nNodes;
    assert( Abc_NtkIsLogic(pNtk) || Abc_NtkIsStrash(pNtk) );
    // consider the special case when the network is already structurally hashed
    if ( Abc_NtkIsStrash(pNtk) )
        return Abc_NtkRestrash( pNtk, fCleanup );
    // convert the node representation in the logic network to the AIG form
    if ( !Abc_NtkLogicToAig(pNtk) )
    {
        printf( "Converting to AIGs has failed.\n" );
        return NULL;
    }
    // perform strashing
//    Abc_NtkCleanCopy( pNtk );
    pNtkAig = Abc_NtkStartFrom( pNtk, ABC_NTK_STRASH, ABC_FUNC_AIG );
    Abc_NtkStrashPerform( pNtk, pNtkAig, fAllNodes );
    Abc_NtkFinalize( pNtk, pNtkAig );
    // print warning about self-feed latches
//    if ( Abc_NtkCountSelfFeedLatches(pNtkAig) )
//        printf( "Warning: The network has %d self-feeding latches.\n", Abc_NtkCountSelfFeedLatches(pNtkAig) );
    // perform cleanup if requested
    nNodes = fCleanup? Abc_AigCleanup(pNtkAig->pManFunc) : 0;
//    if ( nNodes )
//        printf( "Warning: AIG cleanup removed %d nodes (this is not a bug).\n", nNodes );
    // duplicate EXDC 
    if ( pNtk->pExdc )
        pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
    // make sure everything is okay
    if ( !Abc_NtkCheck( pNtkAig ) )
    {
        printf( "Abc_NtkStrash: The network check has failed.\n" );
        Abc_NtkDelete( pNtkAig );
        return NULL;
    }
    return pNtkAig;
}

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

  Synopsis    [Appends the second network to the first.]

  Description [Modifies the first network by adding the logic of the second. 
  Performs structural hashing while appending the networks. Does not change 
  the second network. Returns 0 if the appending failed, 1 otherise.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_NtkAppend( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fAddPos )
{
    Abc_Obj_t * pObj;
    char * pName;
    int i, nNewCis;
    // the first network should be an AIG
    assert( Abc_NtkIsStrash(pNtk1) );
    assert( Abc_NtkIsLogic(pNtk2) || Abc_NtkIsStrash(pNtk2) ); 
    if ( Abc_NtkIsLogic(pNtk2) && !Abc_NtkLogicToAig(pNtk2) )
    {
        printf( "Converting to AIGs has failed.\n" );
        return 0;
    }
    // check that the networks have the same PIs
    // reorder PIs of pNtk2 according to pNtk1
    if ( !Abc_NtkCompareSignals( pNtk1, pNtk2, 1, 1 ) )
        printf( "Abc_NtkAppend(): The union of the network PIs is computed (warning).\n" );
    // perform strashing
    nNewCis = 0;
    Abc_NtkCleanCopy( pNtk2 );
    Abc_NtkForEachCi( pNtk2, pObj, i )
    {
        pName = Abc_ObjName(pObj);
        pObj->pCopy = Abc_NtkFindCi(pNtk1, Abc_ObjName(pObj));
        if ( pObj->pCopy == NULL )
        {
            pObj->pCopy = Abc_NtkDupObj(pNtk1, pObj, 1);
            nNewCis++;
        }
    }
    if ( nNewCis )
        printf( "Warning: Procedure Abc_NtkAppend() added %d new CIs.\n", nNewCis );
    // add pNtk2 to pNtk1 while strashing
    if ( Abc_NtkIsLogic(pNtk2) )
        Abc_NtkStrashPerform( pNtk2, pNtk1, 1 );
    else
        Abc_NtkForEachNode( pNtk2, pObj, i )
            pObj->pCopy = Abc_AigAnd( pNtk1->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
    // add the COs of the second network
    if ( fAddPos )
    {
        Abc_NtkForEachPo( pNtk2, pObj, i )
        {
            Abc_NtkDupObj( pNtk1, pObj, 0 );
            Abc_ObjAddFanin( pObj->pCopy, Abc_ObjChild0Copy(pObj) );
            Abc_ObjAssignName( pObj->pCopy, Abc_ObjName(pObj->pCopy), NULL );
        }
    }
    // make sure that everything is okay
    if ( !Abc_NtkCheck( pNtk1 ) )
    {
        printf( "Abc_NtkAppend: The network check has failed.\n" );
        return 0;
    }
    return 1;
}

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

  Synopsis    [Prepares the network for strashing.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkStrashPerform( Abc_Ntk_t * pNtkOld, Abc_Ntk_t * pNtkNew, bool fAllNodes )
{
    extern Vec_Ptr_t * Abc_NtkDfsIter( Abc_Ntk_t * pNtk, int fCollectAll );
    ProgressBar * pProgress;
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pNodeOld;
    int i, clk = clock();
    assert( Abc_NtkIsLogic(pNtkOld) );
    assert( Abc_NtkIsStrash(pNtkNew) );
//    vNodes = Abc_NtkDfs( pNtkOld, fAllNodes );
    vNodes = Abc_NtkDfsIter( pNtkOld, fAllNodes );
//printf( "Nodes = %d. ", Vec_PtrSize(vNodes) );
//PRT( "Time", clock() - clk );
    pProgress = Extra_ProgressBarStart( stdout, vNodes->nSize );
    Vec_PtrForEachEntry( vNodes, pNodeOld, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        pNodeOld->pCopy = Abc_NodeStrash( pNtkNew, pNodeOld );
    }
    Extra_ProgressBarStop( pProgress );
    Vec_PtrFree( vNodes );
}

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

  Synopsis    [Transfers the AIG from one manager into another.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NodeStrash_rec( Abc_Aig_t * pMan, Hop_Obj_t * pObj )
{
    assert( !Hop_IsComplement(pObj) );
    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
        return;
    Abc_NodeStrash_rec( pMan, Hop_ObjFanin0(pObj) ); 
    Abc_NodeStrash_rec( pMan, Hop_ObjFanin1(pObj) );
    pObj->pData = Abc_AigAnd( pMan, (Abc_Obj_t *)Hop_ObjChild0Copy(pObj), (Abc_Obj_t *)Hop_ObjChild1Copy(pObj) );
    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
    Hop_ObjSetMarkA( pObj );
}

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

  Synopsis    [Strashes one logic node.]

  Description [Assume the network is in the AIG form]
               
  SideEffects []
 
  SeeAlso     []

***********************************************************************/
Abc_Obj_t * Abc_NodeStrash( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNodeOld )
{
    Hop_Man_t * pMan;
    Hop_Obj_t * pRoot;
    Abc_Obj_t * pFanin;
    int i;
    assert( Abc_ObjIsNode(pNodeOld) );
    assert( Abc_NtkHasAig(pNodeOld->pNtk) && !Abc_NtkIsStrash(pNodeOld->pNtk) );
    // get the local AIG manager and the local root node
    pMan = pNodeOld->pNtk->pManFunc;
    pRoot = pNodeOld->pData;
    // check the constant case
    if ( Abc_NodeIsConst(pNodeOld) || Hop_Regular(pRoot) == Hop_ManConst1(pMan) )
        return Abc_ObjNotCond( Abc_AigConst1(pNtkNew), Hop_IsComplement(pRoot) );
    // set elementary variables
    Abc_ObjForEachFanin( pNodeOld, pFanin, i )
        Hop_IthVar(pMan, i)->pData = pFanin->pCopy;
    // strash the AIG of this node
    Abc_NodeStrash_rec( pNtkNew->pManFunc, Hop_Regular(pRoot) );
    Hop_ConeUnmark_rec( Hop_Regular(pRoot) );
    // return the final node
    return Abc_ObjNotCond( Hop_Regular(pRoot)->pData, Hop_IsComplement(pRoot) );
}







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

  Synopsis    [Copies the topmost levels of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Obj_t * Abc_NtkTopmost_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode, int LevelCut )
{
    assert( Abc_ObjIsComplement(pNode) );
    if ( pNode->pCopy )
        return pNode->pCopy;
    if ( pNode->Level <= (unsigned)LevelCut )
        return pNode->pCopy = Abc_NtkCreatePi( pNtkNew );
    Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin0(pNode), LevelCut );
    Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin1(pNode), LevelCut );
    return pNode->pCopy = Abc_AigAnd( pNtkNew->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
}

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

  Synopsis    [Copies the topmost levels of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkTopmost( Abc_Ntk_t * pNtk, int nLevels )
{
    Abc_Ntk_t * pNtkNew;
    Abc_Obj_t * pObjNew, * pPoNew;
    int LevelCut;
    assert( Abc_NtkIsStrash(pNtk) );
    assert( Abc_NtkCoNum(pNtk) == 1 );
    // get the cutoff level
    LevelCut = ABC_MAX( 0, Abc_AigLevel(pNtk) - nLevels );
    // start the network
    pNtkNew = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    pNtkNew->pName = Extra_UtilStrsav(pNtk->pName);
    Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pNtkNew);
    // create PIs below the cut and nodes above the cut
    Abc_NtkCleanCopy( pNtk );
    pObjNew = Abc_NtkTopmost_rec( pNtkNew, Abc_ObjFanin0(Abc_NtkPo(pNtk, 0)), LevelCut );
    // add the PO node and name
    pPoNew = Abc_NtkCreatePo(pNtkNew);
    Abc_ObjAddFanin( pPoNew, pObjNew );
    Abc_NtkAddDummyPiNames( pNtkNew );
    Abc_ObjAssignName( pPoNew, Abc_ObjName(Abc_NtkPo(pNtk, 0)), NULL );
    // make sure everything is okay
    if ( !Abc_NtkCheck( pNtkNew ) )
    {
        printf( "Abc_NtkTopmost: The network check has failed.\n" );
        Abc_NtkDelete( pNtkNew );
        return NULL;
    }
    return pNtkNew;
}


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