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
|
/**CFile****************************************************************
FileName [bmcLoad.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based bounded model checking.]
Synopsis [Experiments with CNF loading.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: bmcLoad.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "bmc.h"
#include "sat/bsat/satStore.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct Bmc_Load_t_ Bmc_Load_t;
struct Bmc_Load_t_
{
Bmc_AndPar_t * pPars; // parameters
Gia_Man_t * pGia; // unrolled AIG
sat_solver * pSat; // SAT solvers
Vec_Int_t * vSat2Id; // maps SAT var into its node
// Vec_Int_t * vCut; // cut in terms of GIA IDs
// Vec_Int_t * vCnf; // CNF for the cut
int nCallBacks1;
int nCallBacks2;
};
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Load CNF for the cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Bmc_LoadGetSatVar( Bmc_Load_t * p, int Id )
{
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
if ( pObj->Value == 0 )
{
pObj->Value = Vec_IntSize( p->vSat2Id );
Vec_IntPush( p->vSat2Id, Id );
sat_solver_setnvars( p->pSat, Vec_IntSize(p->vSat2Id) );
}
return pObj->Value;
}
int Bmc_LoadAddCnf( void * pMan, int iLit )
{
Bmc_Load_t * p = (Bmc_Load_t *)pMan;
int Lits[3], iVar = Abc_Lit2Var(iLit);
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Vec_IntEntry(p->vSat2Id, iVar) );
p->nCallBacks1++;
if ( Gia_ObjIsCi(pObj) || Gia_ObjIsConst0(pObj) )
return 0;
assert( Gia_ObjIsAnd(pObj) );
if ( (Abc_LitIsCompl(iLit) ? pObj->fMark1 : pObj->fMark0) )
return 0;
Lits[0] = Abc_LitNot(iLit);
if ( Abc_LitIsCompl(iLit) )
{
Lits[1] = Abc_Var2Lit( Bmc_LoadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), !Gia_ObjFaninC0(pObj) );
Lits[2] = Abc_Var2Lit( Bmc_LoadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), !Gia_ObjFaninC1(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 3, 0 );
pObj->fMark1 = 1;
}
else
{
Lits[1] = Abc_Var2Lit( Bmc_LoadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), Gia_ObjFaninC0(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
Lits[1] = Abc_Var2Lit( Bmc_LoadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), Gia_ObjFaninC1(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
pObj->fMark0 = 1;
}
p->nCallBacks2++;
return 1;
}
int Bmc_LoadAddCnf_rec( Bmc_Load_t * p, int Id )
{
int iVar = Bmc_LoadGetSatVar( p, Id );
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
if ( Gia_ObjIsAnd(pObj) && !(pObj->fMark0 && pObj->fMark1) )
{
Bmc_LoadAddCnf( p, Abc_Var2Lit(iVar, 0) );
Bmc_LoadAddCnf( p, Abc_Var2Lit(iVar, 1) );
Bmc_LoadAddCnf_rec( p, Gia_ObjFaninId0(pObj, Id) );
Bmc_LoadAddCnf_rec( p, Gia_ObjFaninId1(pObj, Id) );
}
return iVar;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Bmc_Load_t * Bmc_LoadStart( Gia_Man_t * pGia )
{
Bmc_Load_t * p;
int Lit;
Gia_ManSetPhase( pGia );
Gia_ManCleanValue( pGia );
Gia_ManCreateRefs( pGia );
p = ABC_CALLOC( Bmc_Load_t, 1 );
p->pGia = pGia;
p->pSat = sat_solver_new();
p->vSat2Id = Vec_IntAlloc( 1000 );
Vec_IntPush( p->vSat2Id, 0 );
// create constant node
Lit = Abc_Var2Lit( Bmc_LoadGetSatVar(p, 0), 1 );
sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
return p;
}
void Bmc_LoadStop( Bmc_Load_t * p )
{
Vec_IntFree( p->vSat2Id );
sat_solver_delete( p->pSat );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Bmc_LoadTest( Gia_Man_t * pGia, int fLoadCnf, int fVerbose )
{
int nConfLimit = 0;
Bmc_Load_t * p;
Gia_Obj_t * pObj;
int i, status, Lit;
abctime clk = Abc_Clock();
// create the loading manager
p = Bmc_LoadStart( pGia );
// add callback for CNF loading
if ( fLoadCnf )
{
p->pSat->pCnfMan = p;
p->pSat->pCnfFunc = Bmc_LoadAddCnf;
}
// solve SAT problem for each PO
Gia_ManForEachPo( pGia, pObj, i )
{
if ( fLoadCnf )
Lit = Abc_Var2Lit( Bmc_LoadGetSatVar(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
else
Lit = Abc_Var2Lit( Bmc_LoadAddCnf_rec(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
if ( fVerbose )
{
printf( "Frame%4d : ", i );
printf( "Vars = %6d ", Vec_IntSize(p->vSat2Id) );
printf( "Clas = %6d ", sat_solver_nclauses(p->pSat) );
}
status = sat_solver_solve( p->pSat, &Lit, &Lit + 1, (ABC_INT64_T)nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( fVerbose )
{
printf( "Conf = %6d ", sat_solver_nconflicts(p->pSat) );
if ( status == l_False )
printf( "UNSAT " );
else if ( status == l_True )
printf( "SAT " );
else // if ( status == l_Undec )
printf( "UNDEC " );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
}
printf( "Callbacks = %d. Loadings = %d.\n", p->nCallBacks1, p->nCallBacks2 );
Bmc_LoadStop( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
