summaryrefslogtreecommitdiffstats
path: root/src/base/abci/abcFxu.c
blob: a8e656ce9d8c8a4ed4598c78f24a8144efdbf94b (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
/**CFile****************************************************************

  FileName    [abcFxu.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    [Interface with the fast extract package.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "abc.h"
#include "fxu.h"

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////
 
static bool Abc_NtkFxuCheck( Abc_Ntk_t * pNtk );
static void Abc_NtkFxuCollectInfo( Abc_Ntk_t * pNtk, Fxu_Data_t * p );
static void Abc_NtkFxuReconstruct( Abc_Ntk_t * pNtk, Fxu_Data_t * p );

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


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

  Synopsis    [Performs fast_extract on the current network.]

  Description [Takes the network and the maximum number of nodes to extract.
  Uses the concurrent double-cube and single cube divisor extraction procedure.
  Modifies the network in the end, after extracting all nodes. Note that 
  Ntk_NetworkSweep() may increase the performance of this procedure because 
  the single-literal nodes will not be created in the sparse matrix. Returns 1 
  if the network has been changed.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
bool Abc_NtkFastExtract( Abc_Ntk_t * pNtk, Fxu_Data_t * p )
{
    assert( Abc_NtkIsLogic(pNtk) );
    // convert nodes to SOPs
    if ( Abc_NtkIsMappedLogic(pNtk) )
        Abc_NtkUnmap(pNtk);
    else if ( Abc_NtkIsBddLogic(pNtk) )
    {
        if ( !Abc_NtkBddToSop(pNtk, 0) )
        {
            printf( "Converting to SOPs has failed.\n" );
            return 0;
        }
    }
    else
    { // to make sure the SOPs are SCC-free
//        Abc_NtkSopToBdd(pNtk);
//        Abc_NtkBddToSop(pNtk);
    }
    // check if the network meets the requirements
    if ( !Abc_NtkFxuCheck(pNtk) )
    {
        printf( "Abc_NtkFastExtract: Nodes have duplicated or complemented fanins. FXU is not performed.\n" );
        return 0;
    }
    // sweep removes useless nodes
    Abc_NtkCleanup( pNtk, 0 );
    // collect information about the covers
    Abc_NtkFxuCollectInfo( pNtk, p );
    // call the fast extract procedure
    if ( Fxu_FastExtract(p) > 0 )
    {
        // update the network
        Abc_NtkFxuReconstruct( pNtk, p );
        // make sure everything is okay
        if ( !Abc_NtkCheck( pNtk ) )
            printf( "Abc_NtkFastExtract: The network check has failed.\n" );
        return 1;
    }
    else
        printf( "Warning: The network has not been changed by \"fx\".\n" );
    return 0;
}


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

  Synopsis    [Makes sure the nodes do not have complemented and duplicated fanins.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
bool Abc_NtkFxuCheck( Abc_Ntk_t * pNtk )
{
    Abc_Obj_t * pNode, * pFanin1, * pFanin2;
    int n, i, k;
    Abc_NtkForEachNode( pNtk, pNode, n )
    {
        Abc_ObjForEachFanin( pNode, pFanin1, i )
        {
            if ( i < 2 && Abc_ObjFaninC(pNode, i) )
                return 0;
            Abc_ObjForEachFanin( pNode, pFanin2, k )
            {
                if ( i == k )
                    continue;
                if ( pFanin1 == pFanin2 )
                    return 0;
            }
        }
    }
    return 1;
}

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

  Synopsis    [Collect information about the network for fast_extract.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkFxuCollectInfo( Abc_Ntk_t * pNtk, Fxu_Data_t * p )
{
    Abc_Obj_t * pNode;
    int i;
    // add information to the manager
    p->pManSop    = pNtk->pManFunc;
    p->vSops      = Vec_PtrAlloc(0);
    p->vFanins    = Vec_PtrAlloc(0);
    p->vSopsNew   = Vec_PtrAlloc(0);
    p->vFaninsNew = Vec_PtrAlloc(0);
    Vec_PtrFill( p->vSops,      Abc_NtkObjNumMax(pNtk), NULL );
    Vec_PtrFill( p->vFanins,    Abc_NtkObjNumMax(pNtk), NULL );
    Vec_PtrFill( p->vSopsNew,   Abc_NtkObjNumMax(pNtk) + p->nNodesExt, NULL );
    Vec_PtrFill( p->vFaninsNew, Abc_NtkObjNumMax(pNtk) + p->nNodesExt, NULL );
    // add SOPs and fanin array
    Abc_NtkForEachNode( pNtk, pNode, i )
    {
        if ( Abc_SopGetVarNum(pNode->pData) < 2 )
            continue;
        if ( Abc_SopGetCubeNum(pNode->pData) < 1 )
            continue;
        p->vSops->pArray[i]   = pNode->pData;
        p->vFanins->pArray[i] = &pNode->vFanins;
    }
    p->nNodesOld = Abc_NtkObjNumMax(pNtk);
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkFxuFreeInfo( Fxu_Data_t * p )
{
    int i;
    // free the arrays of new fanins
    if ( p->vFaninsNew )
        for ( i = 0; i < p->vFaninsNew->nSize; i++ )
            if ( p->vFaninsNew->pArray[i] )
                Vec_IntFree( p->vFaninsNew->pArray[i] );
    // free the arrays
    if ( p->vSops      ) Vec_PtrFree( p->vSops      );
    if ( p->vSopsNew   ) Vec_PtrFree( p->vSopsNew   );
    if ( p->vFanins    ) Vec_PtrFree( p->vFanins    );
    if ( p->vFaninsNew ) Vec_PtrFree( p->vFaninsNew );
    FREE( p );
}

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

  Synopsis    [Recostructs the network after FX.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Abc_NtkFxuReconstruct( Abc_Ntk_t * pNtk, Fxu_Data_t * p )
{
    Vec_Int_t * vFanins;
    Abc_Obj_t * pNode, * pFanin;
    int i, k;

    assert( p->vFanins->nSize < p->vFaninsNew->nSize );
    // create the new nodes
    for ( i = p->vFanins->nSize; i < p->vFanins->nSize + p->nNodesNew; i++ )
    {
        // start the node
        pNode = Abc_NtkCreateNode( pNtk );
        assert( i == (int)pNode->Id );
    }
    // update the old nodes
    for ( i = 0; i < p->vFanins->nSize; i++ )
    {
        // the new array of fanins
        vFanins = p->vFaninsNew->pArray[i];
        if ( vFanins == NULL )
            continue;
        // remove old fanins
        pNode = Abc_NtkObj( pNtk, i );
        Abc_ObjRemoveFanins( pNode );
        // add new fanins
        vFanins = p->vFaninsNew->pArray[i];
        for ( k = 0; k < vFanins->nSize; k++ )
        {
            pFanin = Abc_NtkObj( pNtk, vFanins->pArray[k] );
            Abc_ObjAddFanin( pNode, pFanin );
        }
        pNode->pData = p->vSopsNew->pArray[i];
        assert( pNode->pData != NULL );
    }
    // set up the new nodes
    for ( i = p->vFanins->nSize; i < p->vFanins->nSize + p->nNodesNew; i++ )
    {
        // get the new node
        pNode = Abc_NtkObj( pNtk, i );
        // add the fanins
        vFanins = p->vFaninsNew->pArray[i];
        for ( k = 0; k < vFanins->nSize; k++ )
        {
            pFanin = Abc_NtkObj( pNtk, vFanins->pArray[k] );
            Abc_ObjAddFanin( pNode, pFanin );
        }
        pNode->pData = p->vSopsNew->pArray[i];
        assert( pNode->pData != NULL );
    }
}


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