summaryrefslogtreecommitdiffstats
path: root/src/base/abci/abcSense.c
blob: 3e68f0fdc3b56992dcfbc2f113c324f3405da8e4 (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
/**CFile****************************************************************

  FileName    [abcSense.c]

  SystemName  [ABC: Logic synthesis and verification system.]

  PackageName [Network and node package.]

  Synopsis    []

  Author      [Alan Mishchenko]
  
  Affiliation [UC Berkeley]

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

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

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

#include "abc.h"
#include "fraig.h"

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

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

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

  Synopsis    [Copies the topmost levels of the network.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Obj_t * Abc_NtkSensitivityMiter_rec( Abc_Ntk_t * pNtkNew, Abc_Obj_t * pNode )
{
    assert( !Abc_ObjIsComplement(pNode) );
    if ( pNode->pCopy )
        return pNode->pCopy;
    Abc_NtkSensitivityMiter_rec( pNtkNew, Abc_ObjFanin0(pNode) );
    Abc_NtkSensitivityMiter_rec( pNtkNew, Abc_ObjFanin1(pNode) );
    return pNode->pCopy = Abc_AigAnd( pNtkNew->pManFunc, Abc_ObjChild0Copy(pNode), Abc_ObjChild1Copy(pNode) );
}

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

  Synopsis    [Creates miter for the sensitivity analysis.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Abc_Ntk_t * Abc_NtkSensitivityMiter( Abc_Ntk_t * pNtk, int iVar )
{
    Abc_Ntk_t * pMiter;
    Vec_Ptr_t * vNodes;
    Abc_Obj_t * pObj, * pNext, * pFanin, * pOutput, * pObjNew;
    int i;
    assert( Abc_NtkIsStrash(pNtk) );
    assert( iVar < Abc_NtkCiNum(pNtk) );

    // duplicate the network
    pMiter = Abc_NtkAlloc( ABC_NTK_STRASH, ABC_FUNC_AIG, 1 );
    pMiter->pName = Extra_UtilStrsav(pNtk->pName);
    pMiter->pSpec = Extra_UtilStrsav(pNtk->pSpec);

    // assign the PIs
    Abc_NtkCleanCopy( pNtk );
    Abc_AigConst1(pNtk)->pCopy = Abc_AigConst1(pMiter);
    Abc_AigConst1(pNtk)->pData = Abc_AigConst1(pMiter);
    Abc_NtkForEachCi( pNtk, pObj, i )
        pObj->pCopy = pObj->pData = Abc_NtkCreatePi( pMiter );
    Abc_NtkAddDummyPiNames( pMiter );

    // assign the cofactors of the CI node to be constants
    pObj = Abc_NtkCi( pNtk, iVar );
    pObj->pCopy = Abc_ObjNot( Abc_AigConst1(pMiter) ); 
    pObj->pData = Abc_AigConst1(pMiter); 

    // collect the internal nodes
    vNodes = Abc_NtkDfsReverseNodes( pNtk, &pObj, 1 );
    Vec_PtrForEachEntry( vNodes, pObj, i )
    {
        for ( pNext = pObj? pObj->pCopy : pObj; pObj; pObj = pNext, pNext = pObj? pObj->pCopy : pObj )
        {
            pFanin = Abc_ObjFanin0(pObj);
            if ( !Abc_NodeIsTravIdCurrent(pFanin) )
                pFanin->pData = Abc_NtkSensitivityMiter_rec( pMiter, pFanin );
            pFanin = Abc_ObjFanin1(pObj);
            if ( !Abc_NodeIsTravIdCurrent(pFanin) )
                pFanin->pData = Abc_NtkSensitivityMiter_rec( pMiter, pFanin );
            pObj->pCopy = Abc_AigAnd( pMiter->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild1Copy(pObj) );
            pObj->pData = Abc_AigAnd( pMiter->pManFunc, Abc_ObjChild0Data(pObj), Abc_ObjChild1Data(pObj) );
        }
    }
    Vec_PtrFree( vNodes );

    // update the affected COs
    pOutput = Abc_ObjNot( Abc_AigConst1(pMiter) ); 
    Abc_NtkForEachCo( pNtk, pObj, i )
    {
        if ( !Abc_NodeIsTravIdCurrent(pObj) )
            continue;
        // get the result of quantification
        if ( i == Abc_NtkCoNum(pNtk) - 1 )
        {
            pOutput = Abc_AigAnd( pMiter->pManFunc, pOutput, Abc_ObjChild0Data(pObj) );
            pOutput = Abc_AigAnd( pMiter->pManFunc, pOutput, Abc_ObjChild0Copy(pObj) );
        }
        else
        {
            pNext   = Abc_AigXor( pMiter->pManFunc, Abc_ObjChild0Copy(pObj), Abc_ObjChild0Data(pObj) );
            pOutput = Abc_AigOr( pMiter->pManFunc, pOutput, pNext );
        }
    }
    // add the PO node and name
    pObjNew = Abc_NtkCreatePo(pMiter);
    Abc_ObjAddFanin( pObjNew, pOutput );
    Abc_ObjAssignName( pObjNew, "miter", NULL );
    // make sure everything is okay
    if ( !Abc_NtkCheck( pMiter ) )
    {
        printf( "Abc_NtkSensitivityMiter: The network check has failed.\n" );
        Abc_NtkDelete( pMiter );
        return NULL;
    }
    return pMiter;
}

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

  Synopsis    [Computing sensitivity of POs to POs under constraints.]

  Description [The input network is a combinatonal AIG. The last output
  is a constraint. The procedure returns the list of number of PIs, 
  such that at least one PO depends on this PI, under the constraint.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
Vec_Int_t * Abc_NtkSensitivity( Abc_Ntk_t * pNtk, int nConfLim, int fVerbose )
{
    ProgressBar * pProgress;
    Prove_Params_t Params, * pParams = &Params;
    Vec_Int_t * vResult = NULL;
    Abc_Ntk_t * pMiter;
    Abc_Obj_t * pObj;
    int RetValue, i;
    assert( Abc_NtkIsStrash(pNtk) );
    assert( Abc_NtkLatchNum(pNtk) == 0 );
    // set up solving parameters
    Prove_ParamsSetDefault( pParams );
    pParams->nItersMax = 3;
    pParams->nMiteringLimitLast = nConfLim;
    // iterate through the PIs
    vResult = Vec_IntAlloc( 100 );
    pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCiNum(pNtk) );
    Abc_NtkForEachCi( pNtk, pObj, i )
    {
        Extra_ProgressBarUpdate( pProgress, i, NULL );
        // generate the sensitivity miter
        pMiter = Abc_NtkSensitivityMiter( pNtk, i );
        // solve the miter using CEC engine
        RetValue = Abc_NtkIvyProve( &pMiter, pParams );
        if ( RetValue == -1 ) // undecided
            Vec_IntPush( vResult, i );
        else if ( RetValue == 0 )
        {
            int * pSimInfo = Abc_NtkVerifySimulatePattern( pMiter, pMiter->pModel );
            if ( pSimInfo[0] != 1 )
                printf( "ERROR in Abc_NtkMiterProve(): Generated counter-example is invalid.\n" );
//            else
//                printf( "Networks are NOT EQUIVALENT.\n" );
            ABC_FREE( pSimInfo );
            Vec_IntPush( vResult, i );
        }
        Abc_NtkDelete( pMiter );
    }
    Extra_ProgressBarStop( pProgress );
    if ( fVerbose )
    {
        printf( "The outputs are sensitive to %d (out of %d) inputs:\n", 
            Vec_IntSize(vResult), Abc_NtkCiNum(pNtk) );
        Vec_IntForEachEntry( vResult, RetValue, i )
            printf( "%d ", RetValue );
        printf( "\n" );
    }
    return vResult;
}

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