summaryrefslogtreecommitdiffstats
path: root/src/aig/saig/saigTempor.c
blob: 962a81de0549f97f2390b6f8873ff513cf492eb0 (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
/**CFile****************************************************************

  FileName    [saigTempor.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Sequential AIG package.]

  Synopsis    [Temporal decomposition.]

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "saig.h"

ABC_NAMESPACE_IMPL_START


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

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

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

  Synopsis    [Creates initialized timeframes for temporal decomposition.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Aig_Man_t * Saig_ManTemporFrames( Aig_Man_t * pAig, int nFrames )
{
    Aig_Man_t * pFrames;
    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
    int i, f;
    // start the frames package
    Aig_ManCleanData( pAig );
    pFrames = Aig_ManStart( Aig_ManObjNumMax(pAig) * nFrames );
    pFrames->pName = Aig_UtilStrsav( pAig->pName );
    // initiliaze the flops
    Saig_ManForEachLo( pAig, pObj, i )
        pObj->pData = Aig_ManConst0(pFrames);
    // for each timeframe
    for ( f = 0; f < nFrames; f++ )
    {
        Aig_ManConst1(pAig)->pData = Aig_ManConst1(pFrames);
        Saig_ManForEachPi( pAig, pObj, i )
            pObj->pData = Aig_ObjCreatePi(pFrames);
        Aig_ManForEachNode( pAig, pObj, i )
            pObj->pData = Aig_And( pFrames, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
        Aig_ManForEachPo( pAig, pObj, i )
            pObj->pData = Aig_ObjChild0Copy(pObj);
        Saig_ManForEachLiLo( pAig, pObjLi, pObjLo, i )
            pObjLo->pData = pObjLi->pData;
    }
    // create POs for the flop inputs
    Saig_ManForEachLi( pAig, pObj, i )
        Aig_ObjCreatePo( pFrames, (Aig_Obj_t *)pObj->pData );
    Aig_ManCleanup( pFrames );
    return pFrames;
}


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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Aig_Man_t * Saig_ManTemporDecompose( Aig_Man_t * pAig, int nFrames )
{
    Aig_Man_t * pAigNew, * pFrames;
    Aig_Obj_t * pObj, * pReset;
    int i;
    if ( pAig->nConstrs > 0 )
    {
        printf( "The AIG manager should have no constraints.\n" );
        return NULL;
    }
    // create initialized timeframes
    pFrames = Saig_ManTemporFrames( pAig, nFrames );
    assert( Aig_ManPoNum(pFrames) == Aig_ManRegNum(pAig) );

    // start the new manager
    Aig_ManCleanData( pAig );
    pAigNew = Aig_ManStart( Aig_ManNodeNum(pAig) );
    pAigNew->pName = Aig_UtilStrsav( pAig->pName );
    // map the constant node and primary inputs
    Aig_ManConst1(pAig)->pData = Aig_ManConst1( pAigNew );
    Saig_ManForEachPi( pAig, pObj, i )
        pObj->pData = Aig_ObjCreatePi( pAigNew );

    // insert initialization logic
    Aig_ManConst1(pFrames)->pData = Aig_ManConst1( pAigNew );
    Aig_ManForEachPi( pFrames, pObj, i )
        pObj->pData = Aig_ObjCreatePi( pAigNew );
    Aig_ManForEachNode( pFrames, pObj, i )
        pObj->pData = Aig_And( pAigNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
    Aig_ManForEachPo( pFrames, pObj, i )
        pObj->pData = Aig_ObjChild0Copy(pObj);

    // create reset latch (the first one among the latches)
    pReset = Aig_ObjCreatePi( pAigNew );

    // create flop output values
    Saig_ManForEachLo( pAig, pObj, i )
        pObj->pData = Aig_Mux( pAigNew, pReset, Aig_ObjCreatePi(pAigNew), (Aig_Obj_t *)Aig_ManPo(pFrames, i)->pData );
    Aig_ManStop( pFrames );

    // add internal nodes of this frame
    Aig_ManForEachNode( pAig, pObj, i )
        pObj->pData = Aig_And( pAigNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
    // create primary outputs
    Saig_ManForEachPo( pAig, pObj, i )
        Aig_ObjCreatePo( pAigNew, Aig_ObjChild0Copy(pObj) );

    // create reset latch (the first one among the latches)
    Aig_ObjCreatePo( pAigNew, Aig_ManConst1(pAigNew) );
    // create latch inputs
    Saig_ManForEachLi( pAig, pObj, i )
        Aig_ObjCreatePo( pAigNew, Aig_ObjChild0Copy(pObj) );

    // finalize
    Aig_ManCleanup( pAigNew );
    Aig_ManSetRegNum( pAigNew, Aig_ManRegNum(pAig)+1 ); // + reset latch (011111...)
    return pAigNew;
}

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

  Synopsis    [Find index of first non-zero entry.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Vec_IntLastNonZeroBeforeLimit( Vec_Int_t * vTemp, int Limit )
{
    int Entry, i;
    if ( vTemp == NULL )
        return -1;
    Vec_IntForEachEntryReverse( vTemp, Entry, i )
    {
        if ( i >= Limit )
            continue;
        if ( Entry )
            return i;
    }
    return -1;
}

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

  Synopsis    []

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Aig_Man_t * Saig_ManTempor( Aig_Man_t * pAig, int nFrames, int TimeOut, int nConfLimit, int fUseBmc, int fUseTransSigs, int fVerbose, int fVeryVerbose )
{ 
    extern int Saig_ManPhasePrefixLength( Aig_Man_t * p, int fVerbose, int fVeryVerbose, Vec_Int_t ** pvTrans );

    Vec_Int_t * vTransSigs = NULL;
    int RetValue, nFramesFinished = -1;
    assert( nFrames >= 0 ); 
    if ( nFrames == 0 )
    {
        nFrames = Saig_ManPhasePrefixLength( pAig, fVerbose, fVeryVerbose, &vTransSigs );
        if ( nFrames == 1 )
        {
            Vec_IntFreeP( &vTransSigs );
            printf( "The leading sequence has length 1. Temporal decomposition is not performed.\n" );
            return NULL;
        }
        if ( fUseTransSigs )
        {
            int Entry, i, iLast = -1;
            Vec_IntForEachEntry( vTransSigs, Entry, i )
                iLast = Entry ? i :iLast;
            if ( iLast > 0 && iLast < nFrames )
            {
                Abc_Print( 1, "Reducing frame count from %d to %d to fit the last transient.\n", nFrames, iLast );
                nFrames = iLast;
            }
        }
        Abc_Print( 1, "Using computed frame number (%d).\n", nFrames );
    }
    else
        Abc_Print( 1, "Using user-given frame number (%d).\n", nFrames );
    // run BMC2
    if ( fUseBmc )
    {
        RetValue = Saig_BmcPerform( pAig, 0, nFrames, 2000, TimeOut, nConfLimit, 0, fVerbose, 0, &nFramesFinished );
        if ( RetValue == 0 )
        {
            Vec_IntFreeP( &vTransSigs );
            printf( "A cex found in the first %d frames.\n", nFrames );
            return NULL;
        }
        if ( nFramesFinished < nFrames )
        {
            int iLastBefore = Vec_IntLastNonZeroBeforeLimit( vTransSigs, nFramesFinished );
            if ( iLastBefore < 1 || !fUseTransSigs )
            {
                Vec_IntFreeP( &vTransSigs );
                printf( "BMC for %d frames could not be completed. A cex may exist!\n", nFrames );
                return NULL;
            }
            assert( iLastBefore < nFramesFinished );
            printf( "BMC succeeded to frame %d. Adjusting frame count to be (%d) based on the last transient signal.\n", nFramesFinished, iLastBefore );
        }
    }
    Vec_IntFreeP( &vTransSigs );
    return Saig_ManTemporDecompose( pAig, nFrames );
}

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

ABC_NAMESPACE_IMPL_END