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
|
/**CFile****************************************************************
FileName [mfsDiv.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [The good old minimization with complete don't-cares.]
Synopsis [Procedures to compute candidate divisors.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: mfsDiv.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "mfsInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Marks and collects the TFI cone of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_MfsWinMarkTfi_rec( Abc_Obj_t * pObj, Vec_Ptr_t * vCone )
{
Abc_Obj_t * pFanin;
int i;
if ( Abc_NodeIsTravIdCurrent(pObj) )
return;
Abc_NodeSetTravIdCurrent( pObj );
if ( Abc_ObjIsCi(pObj) )
{
Vec_PtrPush( vCone, pObj );
return;
}
assert( Abc_ObjIsNode(pObj) );
// visit the fanins of the node
Abc_ObjForEachFanin( pObj, pFanin, i )
Abc_MfsWinMarkTfi_rec( pFanin, vCone );
Vec_PtrPush( vCone, pObj );
}
/**Function*************************************************************
Synopsis [Marks and collects the TFI cone of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Abc_MfsWinMarkTfi( Abc_Obj_t * pNode )
{
Vec_Ptr_t * vCone;
vCone = Vec_PtrAlloc( 100 );
Abc_MfsWinMarkTfi_rec( pNode, vCone );
return vCone;
}
/**Function*************************************************************
Synopsis [Marks the TFO of the collected nodes up to the given level.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_MfsWinSweepLeafTfo_rec( Abc_Obj_t * pObj, int nLevelLimit )
{
Abc_Obj_t * pFanout;
int i;
if ( Abc_ObjIsCo(pObj) || (int)pObj->Level > nLevelLimit )
return;
if ( Abc_NodeIsTravIdCurrent(pObj) )
return;
Abc_NodeSetTravIdCurrent( pObj );
Abc_ObjForEachFanout( pObj, pFanout, i )
Abc_MfsWinSweepLeafTfo_rec( pFanout, nLevelLimit );
}
/**Function*************************************************************
Synopsis [Dereferences the node's MFFC.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_MfsNodeDeref_rec( Abc_Obj_t * pNode )
{
Abc_Obj_t * pFanin;
int i, Counter = 1;
if ( Abc_ObjIsCi(pNode) )
return 0;
Abc_NodeSetTravIdCurrent( pNode );
Abc_ObjForEachFanin( pNode, pFanin, i )
{
assert( pFanin->vFanouts.nSize > 0 );
if ( --pFanin->vFanouts.nSize == 0 )
Counter += Abc_MfsNodeDeref_rec( pFanin );
}
return Counter;
}
/**Function*************************************************************
Synopsis [References the node's MFFC.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_MfsNodeRef_rec( Abc_Obj_t * pNode )
{
Abc_Obj_t * pFanin;
int i, Counter = 1;
if ( Abc_ObjIsCi(pNode) )
return 0;
Abc_ObjForEachFanin( pNode, pFanin, i )
{
if ( pFanin->vFanouts.nSize++ == 0 )
Counter += Abc_MfsNodeRef_rec( pFanin );
}
return Counter;
}
/**Function*************************************************************
Synopsis [Labels MFFC of the node with the current trav ID.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_MfsWinVisitMffc( Abc_Obj_t * pNode )
{
int Count1, Count2;
assert( Abc_ObjIsNode(pNode) );
// dereference the node (mark with the current trav ID)
Count1 = Abc_MfsNodeDeref_rec( pNode );
// reference it back
Count2 = Abc_MfsNodeRef_rec( pNode );
assert( Count1 == Count2 );
return Count1;
}
/**Function*************************************************************
Synopsis [Computes divisors and add them to nodes in the window.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Abc_MfsComputeDivisors( Mfs_Man_t * p, Abc_Obj_t * pNode, int nLevDivMax )
{
Vec_Ptr_t * vCone, * vDivs;
Abc_Obj_t * pObj, * pFanout, * pFanin;
int k, f, m;
int nDivsPlus = 0, nTrueSupp;
assert( p->vDivs == NULL );
// mark the TFI with the current trav ID
Abc_NtkIncrementTravId( pNode->pNtk );
vCone = Abc_MfsWinMarkTfi( pNode );
// count the number of PIs
nTrueSupp = 0;
Vec_PtrForEachEntry( Abc_Obj_t *, vCone, pObj, k )
nTrueSupp += Abc_ObjIsCi(pObj);
// printf( "%d(%d) ", Vec_PtrSize(p->vSupp), m );
// mark with the current trav ID those nodes that should not be divisors:
// (1) the node and its TFO
// (2) the MFFC of the node
// (3) the node's fanins (these are treated as a special case)
Abc_NtkIncrementTravId( pNode->pNtk );
Abc_MfsWinSweepLeafTfo_rec( pNode, nLevDivMax );
// Abc_MfsWinVisitMffc( pNode );
Abc_ObjForEachFanin( pNode, pObj, k )
Abc_NodeSetTravIdCurrent( pObj );
// at this point the nodes are marked with two trav IDs:
// nodes to be collected as divisors are marked with previous trav ID
// nodes to be avoided as divisors are marked with current trav ID
// start collecting the divisors
vDivs = Vec_PtrAlloc( p->pPars->nWinMax );
Vec_PtrForEachEntry( Abc_Obj_t *, vCone, pObj, k )
{
if ( !Abc_NodeIsTravIdPrevious(pObj) )
continue;
if ( (int)pObj->Level > nLevDivMax )
continue;
Vec_PtrPush( vDivs, pObj );
if ( Vec_PtrSize(vDivs) >= p->pPars->nWinMax )
break;
}
Vec_PtrFree( vCone );
// explore the fanouts of already collected divisors
if ( Vec_PtrSize(vDivs) < p->pPars->nWinMax )
Vec_PtrForEachEntry( Abc_Obj_t *, vDivs, pObj, k )
{
// consider fanouts of this node
Abc_ObjForEachFanout( pObj, pFanout, f )
{
// stop if there are too many fanouts
if ( p->pPars->nFanoutsMax && f > p->pPars->nFanoutsMax )
break;
// skip nodes that are already added
if ( Abc_NodeIsTravIdPrevious(pFanout) )
continue;
// skip nodes in the TFO or in the MFFC of node
if ( Abc_NodeIsTravIdCurrent(pFanout) )
continue;
// skip COs
if ( !Abc_ObjIsNode(pFanout) )
continue;
// skip nodes with large level
if ( (int)pFanout->Level > nLevDivMax )
continue;
// skip nodes whose fanins are not divisors -- here we skip more than we need to skip!!! (revise later) August 7, 2009
Abc_ObjForEachFanin( pFanout, pFanin, m )
if ( !Abc_NodeIsTravIdPrevious(pFanin) )
break;
if ( m < Abc_ObjFaninNum(pFanout) )
continue;
// make sure this divisor in not among the nodes
// Vec_PtrForEachEntry( Abc_Obj_t *, p->vNodes, pFanin, m )
// assert( pFanout != pFanin );
// add the node to the divisors
Vec_PtrPush( vDivs, pFanout );
// Vec_PtrPush( p->vNodes, pFanout );
Vec_PtrPushUnique( p->vNodes, pFanout );
Abc_NodeSetTravIdPrevious( pFanout );
nDivsPlus++;
if ( Vec_PtrSize(vDivs) >= p->pPars->nWinMax )
break;
}
if ( Vec_PtrSize(vDivs) >= p->pPars->nWinMax )
break;
}
p->nMaxDivs += (Vec_PtrSize(vDivs) >= p->pPars->nWinMax);
// sort the divisors by level in the increasing order
Vec_PtrSort( vDivs, (int (*)(const void *, const void *))Abc_NodeCompareLevelsIncrease );
// add the fanins of the node
Abc_ObjForEachFanin( pNode, pFanin, k )
Vec_PtrPush( vDivs, pFanin );
/*
printf( "Node level = %d. ", Abc_ObjLevel(p->pNode) );
Vec_PtrForEachEntryStart( Abc_Obj_t *, vDivs, pObj, k, Vec_PtrSize(vDivs)-p->nDivsPlus )
printf( "%d ", Abc_ObjLevel(pObj) );
printf( "\n" );
*/
//printf( "%d ", p->nDivsPlus );
// printf( "(%d+%d)(%d+%d+%d) ", Vec_PtrSize(p->vSupp), Vec_PtrSize(p->vNodes),
// nTrueSupp, Vec_PtrSize(vDivs)-nTrueSupp-nDivsPlus, nDivsPlus );
return vDivs;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
