/**CFile****************************************************************
FileName [saigBmc3.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Sequential AIG package.]
Synopsis [Simple BMC package.]
Author [Alan Mishchenko in collaboration with Niklas Een.]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: saigBmc3.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "saig.h"
#include "fra.h"
#include "cnf.h"
#include "satStore.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct Gia_ManBmc_t_ Gia_ManBmc_t;
struct Gia_ManBmc_t_
{
// input/output data
Saig_ParBmc_t * pPars; // parameters
Aig_Man_t * pAig; // user AIG
Vec_Ptr_t * vCexes; // counter-examples
// intermediate data
Vec_Int_t * vMapping; // mapping
Vec_Vec_t * vSects; // sections
Vec_Int_t * vId2Num; // number of each node
Vec_Int_t * vVisited; // visited nodes
// SAT variables
Vec_Int_t * vPiVars; // SAT vars for the PIs
Vec_Ptr_t * vId2Var; // SAT vars for each object
// SAT solver
sat_solver * pSat; // SAT solver
int nSatVars; // SAT variables
int nObjNums; // SAT objects
int nBufNum; // the number of simple nodes
int nDupNum; // the number of simple nodes
char * pSopSizes, ** pSops; // CNF representation
};
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
#define SAIG_TER_ZER 1
#define SAIG_TER_ONE 2
#define SAIG_TER_UND 3
static inline int Saig_ManBmcSimInfoNot( int Value )
{
if ( Value == SAIG_TER_ZER )
return SAIG_TER_ONE;
if ( Value == SAIG_TER_ONE )
return SAIG_TER_ZER;
return SAIG_TER_UND;
}
static inline int Saig_ManBmcSimInfoAnd( int Value0, int Value1 )
{
if ( Value0 == SAIG_TER_ZER || Value1 == SAIG_TER_ZER )
return SAIG_TER_ZER;
if ( Value0 == SAIG_TER_ONE && Value1 == SAIG_TER_ONE )
return SAIG_TER_ONE;
return SAIG_TER_UND;
}
static inline int Saig_ManBmcSimInfoGet( unsigned * pInfo, Aig_Obj_t * pObj )
{
return 3 & (pInfo[Aig_ObjId(pObj) >> 4] >> ((Aig_ObjId(pObj) & 15) << 1));
}
static inline void Saig_ManBmcSimInfoSet( unsigned * pInfo, Aig_Obj_t * pObj, int Value )
{
assert( Value >= SAIG_TER_ZER && Value <= SAIG_TER_UND );
Value ^= Saig_ManBmcSimInfoGet( pInfo, pObj );
pInfo[Aig_ObjId(pObj) >> 4] ^= (Value << ((Aig_ObjId(pObj) & 15) << 1));
}
/**Function*************************************************************
Synopsis [Returns the number of LIs with binary ternary info.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Saig_ManBmcTerSimCount01( Aig_Man_t * p, unsigned * pInfo )
{
Aig_Obj_t * pObj;
int i, Counter = 0;
if ( pInfo == NULL )
return Saig_ManRegNum(p);
Saig_ManForEachLi( p, pObj, i )
if ( !Aig_ObjIsConst1(Aig_ObjFanin0(pObj)) )
Counter += (Saig_ManBmcSimInfoGet(pInfo, pObj) != SAIG_TER_UND);
return Counter;
}
/**Function*************************************************************
Synopsis [Performs ternary simulation of one frame.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned * Saig_ManBmcTerSimOne( Aig_Man_t * p, unsigned * pPrev )
{
Aig_Obj_t * pObj, * pObjLi;
unsigned * pInfo;
int i, Val0, Val1;
pInfo = ABC_CALLOC( unsigned, Aig_BitWordNum(2 * Aig_ManObjNumMax(p)) );
Saig_ManBmcSimInfoSet( pInfo, Aig_ManConst1(p), SAIG_TER_ONE );
Saig_ManForEachPi( p, pObj, i )
Saig_ManBmcSimInfoSet( pInfo, pObj, SAIG_TER_UND );
if ( pPrev == NULL )
{
Saig_ManForEachLo( p, pObj, i )
Saig_ManBmcSimInfoSet( pInfo, pObj, SAIG_TER_ZER );
}
else
{
Saig_ManForEachLiLo( p, pObjLi, pObj, i )
Saig_ManBmcSimInfoSet( pInfo, pObj, Saig_ManBmcSimInfoGet(pPrev, pObjLi) );
}
Aig_ManForEachNode( p, pObj, i )
{
Val0 = Saig_ManBmcSimInfoGet( pInfo, Aig_ObjFanin0(pObj) );
Val1 = Saig_ManBmcSimInfoGet( pInfo, Aig_ObjFanin1(pObj) );
if ( Aig_ObjFaninC0(pObj) )
Val0 = Saig_ManBmcSimInfoNot( Val0 );
if ( Aig_ObjFaninC1(pObj) )
Val1 = Saig_ManBmcSimInfoNot( Val1 );
Saig_ManBmcSimInfoSet( pInfo, pObj, Saig_ManBmcSimInfoAnd(Val0, Val1) );
}
Aig_ManForEachPo( p, pObj, i )
{
Val0 = Saig_ManBmcSimInfoGet( pInfo, Aig_ObjFanin0(pObj) );
if ( Aig_ObjFaninC0(pObj) )
Val0 = Saig_ManBmcSimInfoNot( Val0 );
Saig_ManBmcSimInfoSet( pInfo, pObj, Val0 );
}
return pInfo;
}
/**Function*************************************************************
Synopsis [Collects internal nodes and PIs in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Saig_ManBmcTerSim( Aig_Man_t * p )
{
Vec_Ptr_t * vInfos;
unsigned * pInfo = NULL;
int i, TerPrev = ABC_INFINITY, TerCur, CountIncrease = 0;
vInfos = Vec_PtrAlloc( 100 );
for ( i = 0; i < 1000 && CountIncrease < 5 && TerPrev > 0; i++ )
{
TerCur = Saig_ManBmcTerSimCount01( p, pInfo );
if ( TerCur >= TerPrev )
CountIncrease++;
TerPrev = TerCur;
pInfo = Saig_ManBmcTerSimOne( p, pInfo );
Vec_PtrPush( vInfos, pInfo );
}
return vInfos;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcTerSimTest( Aig_Man_t * p )
{
Vec_Ptr_t * vInfos;
unsigned * pInfo;
int i;
vInfos = Saig_ManBmcTerSim( p );
Vec_PtrForEachEntry( unsigned *, vInfos, pInfo, i )
printf( "%d=%d ", i, Saig_ManBmcTerSimCount01(p, pInfo) );
printf( "\n" );
Vec_PtrFreeFree( vInfos );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcDfs_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
Aig_ObjSetTravIdCurrent(p, pObj);
if ( Aig_ObjIsNode(pObj) )
{
Saig_ManBmcDfs_rec( p, Aig_ObjFanin0(pObj), vNodes );
Saig_ManBmcDfs_rec( p, Aig_ObjFanin1(pObj), vNodes );
}
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes and PIs in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Saig_ManBmcDfsNodes( Aig_Man_t * p, Vec_Ptr_t * vRoots )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
vNodes = Vec_PtrAlloc( 100 );
Vec_PtrForEachEntry( Aig_Obj_t *, vRoots, pObj, i )
Saig_ManBmcDfs_rec( p, Aig_ObjFanin0(pObj), vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Vec_t * Saig_ManBmcSections( Aig_Man_t * p )
{
Vec_Ptr_t * vSects, * vRoots, * vCone;
Aig_Obj_t * pObj, * pObjPo;
int i;
Aig_ManIncrementTravId( p );
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
// start the roots
vRoots = Vec_PtrAlloc( 1000 );
Saig_ManForEachPo( p, pObjPo, i )
{
Aig_ObjSetTravIdCurrent( p, pObjPo );
Vec_PtrPush( vRoots, pObjPo );
}
// compute the cones
vSects = Vec_PtrAlloc( 20 );
while ( Vec_PtrSize(vRoots) > 0 )
{
vCone = Saig_ManBmcDfsNodes( p, vRoots );
Vec_PtrPush( vSects, vCone );
// get the next set of roots
Vec_PtrClear( vRoots );
Vec_PtrForEachEntry( Aig_Obj_t *, vCone, pObj, i )
{
if ( !Saig_ObjIsLo(p, pObj) )
continue;
pObjPo = Saig_ObjLoToLi( p, pObj );
if ( Aig_ObjIsTravIdCurrent(p, pObjPo) )
continue;
Aig_ObjSetTravIdCurrent( p, pObjPo );
Vec_PtrPush( vRoots, pObjPo );
}
}
Vec_PtrFree( vRoots );
return (Vec_Vec_t *)vSects;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcSectionsTest( Aig_Man_t * p )
{
Vec_Vec_t * vSects;
Vec_Ptr_t * vOne;
int i;
vSects = Saig_ManBmcSections( p );
Vec_VecForEachLevel( vSects, vOne, i )
printf( "%d=%d ", i, Vec_PtrSize(vOne) );
printf( "\n" );
Vec_VecFree( vSects );
}
/**Function*************************************************************
Synopsis [Collects the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcSupergate_rec( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
{
// if the new node is complemented or a PI, another gate begins
if ( Aig_IsComplement(pObj) || Aig_ObjIsPi(pObj) ) // || (Aig_ObjRefs(pObj) > 1) )
{
Vec_PtrPushUnique( vSuper, Aig_Regular(pObj) );
return;
}
// go through the branches
Saig_ManBmcSupergate_rec( Aig_ObjChild0(pObj), vSuper );
Saig_ManBmcSupergate_rec( Aig_ObjChild1(pObj), vSuper );
}
/**Function*************************************************************
Synopsis [Collect the topmost supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Saig_ManBmcSupergate( Aig_Man_t * p, int iPo )
{
Vec_Ptr_t * vSuper;
Aig_Obj_t * pObj;
vSuper = Vec_PtrAlloc( 10 );
pObj = Aig_ManPo( p, iPo );
pObj = Aig_ObjChild0( pObj );
if ( !Aig_IsComplement(pObj) )
{
Vec_PtrPush( vSuper, pObj );
return vSuper;
}
pObj = Aig_Regular( pObj );
if ( !Aig_ObjIsNode(pObj) )
{
Vec_PtrPush( vSuper, pObj );
return vSuper;
}
Saig_ManBmcSupergate_rec( Aig_ObjChild0(pObj), vSuper );
Saig_ManBmcSupergate_rec( Aig_ObjChild1(pObj), vSuper );
return vSuper;
}
/**Function*************************************************************
Synopsis [Returns the number of nodes with ref counter more than 1.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Saig_ManBmcCountRefed( Aig_Man_t * p, Vec_Ptr_t * vSuper )
{
Aig_Obj_t * pObj;
int i, Counter = 0;
Vec_PtrForEachEntry( Aig_Obj_t *, vSuper, pObj, i )
{
assert( !Aig_IsComplement(pObj) );
Counter += (Aig_ObjRefs(pObj) > 1);
}
return Counter;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcSupergateTest( Aig_Man_t * p )
{
Vec_Ptr_t * vSuper;
Aig_Obj_t * pObj;
int i;
printf( "Supergates: " );
Saig_ManForEachPo( p, pObj, i )
{
vSuper = Saig_ManBmcSupergate( p, i );
printf( "%d=%d(%d) ", i, Vec_PtrSize(vSuper), Saig_ManBmcCountRefed(p, vSuper) );
Vec_PtrFree( vSuper );
}
printf( "\n" );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcWriteBlif( Aig_Man_t * p, Vec_Int_t * vMapping, char * pFileName )
{
FILE * pFile;
char * pSopSizes, ** pSops;
Aig_Obj_t * pObj;
char Vals[4];
int i, k, b, iFan, iTruth, * pData;
pFile = fopen( pFileName, "w" );
if ( pFile == NULL )
{
printf( "Cannot open file %s\n", pFileName );
return;
}
fprintf( pFile, ".model test\n" );
fprintf( pFile, ".inputs" );
Aig_ManForEachPi( p, pObj, i )
fprintf( pFile, " n%d", Aig_ObjId(pObj) );
fprintf( pFile, "\n" );
fprintf( pFile, ".outputs" );
Aig_ManForEachPo( p, pObj, i )
fprintf( pFile, " n%d", Aig_ObjId(pObj) );
fprintf( pFile, "\n" );
fprintf( pFile, ".names" );
fprintf( pFile, " n%d\n", Aig_ObjId(Aig_ManConst1(p)) );
fprintf( pFile, " 1\n" );
Cnf_ReadMsops( &pSopSizes, &pSops );
Aig_ManForEachNode( p, pObj, i )
{
if ( Vec_IntEntry(vMapping, i) == 0 )
continue;
pData = Vec_IntEntryP( vMapping, Vec_IntEntry(vMapping, i) );
fprintf( pFile, ".names" );
for ( iFan = 0; iFan < 4; iFan++ )
if ( pData[iFan+1] >= 0 )
fprintf( pFile, " n%d", pData[iFan+1] );
else
break;
fprintf( pFile, " n%d\n", i );
// write SOP
iTruth = pData[0] & 0xffff;
for ( k = 0; k < pSopSizes[iTruth]; k++ )
{
int Lit = pSops[iTruth][k];
for ( b = 3; b >= 0; b-- )
{
if ( Lit % 3 == 0 )
Vals[b] = '0';
else if ( Lit % 3 == 1 )
Vals[b] = '1';
else
Vals[b] = '-';
Lit = Lit / 3;
}
for ( b = 0; b < iFan; b++ )
fprintf( pFile, "%c", Vals[b] );
fprintf( pFile, " 1\n" );
}
}
free( pSopSizes );
free( pSops[1] );
free( pSops );
Aig_ManForEachPo( p, pObj, i )
{
fprintf( pFile, ".names" );
fprintf( pFile, " n%d", Aig_ObjId(Aig_ObjFanin0(pObj)) );
fprintf( pFile, " n%d\n", Aig_ObjId(pObj) );
fprintf( pFile, "%d 1\n", !Aig_ObjFaninC0(pObj) );
}
fprintf( pFile, ".end\n" );
fclose( pFile );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcMappingTest( Aig_Man_t * p )
{
Vec_Int_t * vMapping;
vMapping = Cnf_DeriveMappingArray( p );
Saig_ManBmcWriteBlif( p, vMapping, "test.blif" );
Vec_IntFree( vMapping );
}
/**Function*************************************************************
Synopsis [Create manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_ManBmc_t * Saig_Bmc3ManStart( Aig_Man_t * pAig )
{
Gia_ManBmc_t * p;
Aig_Obj_t * pObj;
int i;
// assert( Aig_ManRegNum(pAig) > 0 );
p = ABC_CALLOC( Gia_ManBmc_t, 1 );
p->pAig = pAig;
// create mapping
p->vMapping = Cnf_DeriveMappingArray( pAig );
// create sections
p->vSects = Saig_ManBmcSections( pAig );
// map object IDs into their numbers and section numbers
p->nObjNums = 0;
p->vId2Num = Vec_IntStartFull( Aig_ManObjNumMax(pAig) );
Vec_IntWriteEntry( p->vId2Num, Aig_ObjId(Aig_ManConst1(pAig)), p->nObjNums++ );
Aig_ManForEachPi( pAig, pObj, i )
Vec_IntWriteEntry( p->vId2Num, Aig_ObjId(pObj), p->nObjNums++ );
Aig_ManForEachNode( pAig, pObj, i )
if ( Vec_IntEntry(p->vMapping, Aig_ObjId(pObj)) > 0 )
Vec_IntWriteEntry( p->vId2Num, Aig_ObjId(pObj), p->nObjNums++ );
Aig_ManForEachPo( pAig, pObj, i )
Vec_IntWriteEntry( p->vId2Num, Aig_ObjId(pObj), p->nObjNums++ );
p->vPiVars = Vec_IntAlloc( 1000 );
p->vId2Var = Vec_PtrAlloc( 100 );
p->vVisited = Vec_IntAlloc( 1000 );
// create solver
p->nSatVars = 1;
p->pSat = sat_solver_new();
sat_solver_setnvars( p->pSat, 1000 );
Cnf_ReadMsops( &p->pSopSizes, &p->pSops );
return p;
}
/**Function*************************************************************
Synopsis [Delete manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_Bmc3ManStop( Gia_ManBmc_t * p )
{
Aig_ManCleanMarkA( p->pAig );
if ( p->vCexes )
{
assert( p->pAig->vSeqModelVec == NULL );
p->pAig->vSeqModelVec = p->vCexes;
p->vCexes = NULL;
}
// Vec_PtrFreeFree( p->vCexes );
Vec_IntFree( p->vMapping );
Vec_VecFree( p->vSects );
Vec_IntFree( p->vId2Num );
Vec_IntFree( p->vPiVars );
Vec_IntFree( p->vVisited );
Vec_VecFree( (Vec_Vec_t *)p->vId2Var );
sat_solver_delete( p->pSat );
free( p->pSopSizes );
free( p->pSops[1] );
free( p->pSops );
free( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int * Saig_ManBmcMapping( Gia_ManBmc_t * p, Aig_Obj_t * pObj )
{
if ( Vec_IntEntry(p->vMapping, Aig_ObjId(pObj)) == 0 )
return NULL;
return Vec_IntEntryP( p->vMapping, Vec_IntEntry(p->vMapping, Aig_ObjId(pObj)) );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Saig_ManBmcLiteral( Gia_ManBmc_t * p, Aig_Obj_t * pObj, int iFrame )
{
Vec_Int_t * vFrame;
int ObjNum;
assert( !Aig_ObjIsNode(pObj) || Saig_ManBmcMapping(p, pObj) );
ObjNum = Vec_IntEntry( p->vId2Num, Aig_ObjId(pObj) );
assert( ObjNum >= 0 );
vFrame = (Vec_Int_t *)Vec_PtrEntry( p->vId2Var, iFrame );
assert( vFrame != NULL );
return Vec_IntEntry( vFrame, ObjNum );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Saig_ManBmcSetLiteral( Gia_ManBmc_t * p, Aig_Obj_t * pObj, int iFrame, int iLit )
{
Vec_Int_t * vFrame;
int ObjNum;
assert( !Aig_ObjIsNode(pObj) || Saig_ManBmcMapping(p, pObj) );
ObjNum = Vec_IntEntry( p->vId2Num, Aig_ObjId(pObj) );
vFrame = (Vec_Int_t *)Vec_PtrEntry( p->vId2Var, iFrame );
Vec_IntWriteEntry( vFrame, ObjNum, iLit );
if ( iLit == ABC_INFINITY || iLit == ABC_INFINITY+1 )
{
Vec_IntPush( p->vVisited, Aig_ObjId(pObj) );
Vec_IntPush( p->vVisited, iFrame );
}
else if ( iLit != ~0 && Saig_ObjIsPi(p->pAig, pObj) ) // save PI SAT var num
Vec_IntWriteEntry( p->vPiVars, iFrame*Saig_ManPiNum(p->pAig)+Aig_ObjPioNum(pObj), lit_var(iLit) );
return iLit;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Saig_ManBmcCof0( int t, int v )
{
static int s_Truth[4] = { 0xAAAA, 0xCCCC, 0xF0F0, 0xFF00 };
return 0xffff & ((t & ~s_Truth[v]) | ((t & ~s_Truth[v]) << (1<<v)));
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Saig_ManBmcCof1( int t, int v )
{
static int s_Truth[4] = { 0xAAAA, 0xCCCC, 0xF0F0, 0xFF00 };
return 0xffff & ((t & s_Truth[v]) | ((t & s_Truth[v]) >> (1<<v)));
}
/**Function*************************************************************
Synopsis [Derives CNF for one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Saig_ManBmcDeriveTruth( int uTruth, int Lits[] )
{
int v;
for ( v = 0; v < 4; v++ )
if ( Lits[v] == 0 )
{
uTruth = Saig_ManBmcCof0(uTruth, v);
Lits[v] = -1;
}
else if ( Lits[v] == 1 )
{
uTruth = Saig_ManBmcCof1(uTruth, v);
Lits[v] = -1;
}
for ( v = 0; v < 4; v++ )
if ( Lits[v] == -1 )
assert( Saig_ManBmcCof0(uTruth, v) == Saig_ManBmcCof1(uTruth, v) );
return uTruth;
}
/*
void Cnf_SopConvertToVector( char * pSop, int nCubes, Vec_Int_t * vCover )
{
int Lits[4], Cube, iCube, i, b;
Vec_IntClear( vCover );
for ( i = 0; i < nCubes; i++ )
{
Cube = pSop[i];
for ( b = 0; b < 4; b++ )
{
if ( Cube % 3 == 0 )
Lits[b] = 1;
else if ( Cube % 3 == 1 )
Lits[b] = 2;
else
Lits[b] = 0;
Cube = Cube / 3;
}
iCube = 0;
for ( b = 0; b < 4; b++ )
iCube = (iCube << 2) | Lits[b];
Vec_IntPush( vCover, iCube );
}
}
Vec_IntForEachEntry( vCover, Cube, k )
{
*pClas++ = pLits;
*pLits++ = 2 * OutVar;
pLits += Cnf_IsopWriteCube( Cube, pCut->nFanins, pVars, pLits );
}
int Cnf_IsopWriteCube( int Cube, int nVars, int * pVars, int * pLiterals )
{
int nLits = nVars, b;
for ( b = 0; b < nVars; b++ )
{
if ( (Cube & 3) == 1 ) // value 0 --> write positive literal
*pLiterals++ = 2 * pVars[b];
else if ( (Cube & 3) == 2 ) // value 1 --> write negative literal
*pLiterals++ = 2 * pVars[b] + 1;
else
nLits--;
Cube >>= 2;
}
return nLits;
}
iTruth = pData[0] & 0xffff;
for ( k = 0; k < pSopSizes[iTruth]; k++ )
{
int Lit = pSops[iTruth][k];
for ( b = 3; b >= 0; b-- )
{
if ( Lit % 3 == 0 )
Vals[b] = '0';
else if ( Lit % 3 == 1 )
Vals[b] = '1';
else
Vals[b] = '-';
Lit = Lit / 3;
}
for ( b = 0; b < iFan; b++ )
fprintf( pFile, "%c", Vals[b] );
fprintf( pFile, " 1\n" );
}
*/
/**Function*************************************************************
Synopsis [Derives CNF for one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Saig_ManBmcAddClauses( Gia_ManBmc_t * p, int uTruth, int Lits[], int iLitOut )
{
int i, k, b, CutLit, nClaLits, ClaLits[5];
assert( uTruth > 0 && uTruth < 0xffff );
// write positive/negative polarity
for ( i = 0; i < 2; i++ )
{
if ( i )
uTruth = 0xffff & ~uTruth;
// Extra_PrintBinary( stdout, &uTruth, 16 ); printf( "\n" );
for ( k = 0; k < p->pSopSizes[uTruth]; k++ )
{
nClaLits = 0;
ClaLits[nClaLits++] = i ? lit_neg(iLitOut) : iLitOut;
CutLit = p->pSops[uTruth][k];
for ( b = 3; b >= 0; b-- )
{
if ( CutLit % 3 == 0 ) // value 0 --> write positive literal
{
assert( Lits[b] > 1 );
ClaLits[nClaLits++] = Lits[b];
}
else if ( CutLit % 3 == 1 ) // value 1 --> write negative literal
{
assert( Lits[b] > 1 );
ClaLits[nClaLits++] = lit_neg(Lits[b]);
}
CutLit = CutLit / 3;
}
// for ( b = 0; b < nClaLits; b++ )
// printf( "%d ", ClaLits[b] );
// printf( "\n" );
if ( !sat_solver_addclause( p->pSat, ClaLits, ClaLits+nClaLits ) )
assert( 0 );
}
}
}
/**Function*************************************************************
Synopsis [Derives CNF for one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Saig_ManBmcCreateCnf_rec( Gia_ManBmc_t * p, Aig_Obj_t * pObj, int iFrame, int fAddClauses )
{
int * pMapping, i, iLit, Lits[4], uTruth;
iLit = Saig_ManBmcLiteral( p, pObj, iFrame );
if ( iLit != ~0 )
return iLit;
assert( iFrame >= 0 );
if ( Aig_ObjIsPi(pObj) )
{
if ( Saig_ObjIsPi(p->pAig, pObj) )
iLit = fAddClauses ? toLit( p->nSatVars++ ) : ABC_INFINITY;
else
iLit = Saig_ManBmcCreateCnf_rec( p, Saig_ObjLoToLi(p->pAig, pObj), iFrame-1, fAddClauses );
return Saig_ManBmcSetLiteral( p, pObj, iFrame, iLit );
}
if ( Aig_ObjIsPo(pObj) )
{
iLit = Saig_ManBmcCreateCnf_rec( p, Aig_ObjFanin0(pObj), iFrame, fAddClauses );
if ( Aig_ObjFaninC0(pObj) )
iLit = lit_neg(iLit);
return Saig_ManBmcSetLiteral( p, pObj, iFrame, iLit );
}
assert( Aig_ObjIsNode(pObj) );
pMapping = Saig_ManBmcMapping( p, pObj );
for ( i = 0; i < 4; i++ )
if ( pMapping[i+1] == -1 )
Lits[i] = -1;
else
Lits[i] = Saig_ManBmcCreateCnf_rec( p, Aig_ManObj(p->pAig, pMapping[i+1]), iFrame, fAddClauses );
// derive new truth table
//uTruth = 0xffff & (unsigned)pMapping[0];
//printf( "Truth : " );
//Extra_PrintBinary( stdout, &uTruth, 16 ); printf( "\n" );
uTruth = Saig_ManBmcDeriveTruth( 0xffff & (unsigned)pMapping[0], Lits );
if ( uTruth == 0 || uTruth == 0xffff )
{
iLit = (uTruth == 0xffff);
return Saig_ManBmcSetLiteral( p, pObj, iFrame, iLit );
}
// create CNF
if ( fAddClauses )
{
iLit = toLit( p->nSatVars++ );
Saig_ManBmcAddClauses( p, uTruth, Lits, iLit );
if ( uTruth == 0xAAAA || (0xffff & ~uTruth) == 0xAAAA ||
uTruth == 0xCCCC || (0xffff & ~uTruth) == 0xCCCC ||
uTruth == 0xF0F0 || (0xffff & ~uTruth) == 0xF0F0 ||
uTruth == 0xFF00 || (0xffff & ~uTruth) == 0xFF00 )
p->nBufNum++;
if ( (Lits[0] > 1 && (Lits[0] == Lits[1] || Lits[0] == Lits[2] || Lits[0] == Lits[3])) ||
(Lits[1] > 1 && (Lits[1] == Lits[2] || Lits[1] == Lits[2])) ||
(Lits[2] > 1 && (Lits[2] == Lits[3])) )
p->nDupNum++;
}
else
{
iLit = ABC_INFINITY;
}
return Saig_ManBmcSetLiteral( p, pObj, iFrame, iLit );
}
/**Function*************************************************************
Synopsis [Derives CNF for one node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Saig_ManBmcCreateCnf( Gia_ManBmc_t * p, Aig_Obj_t * pObj, int iFrame )
{
int i, iLit, Entry, iFrameOld, Value;
Vec_IntClear( p->vVisited );
iLit = Saig_ManBmcCreateCnf_rec( p, pObj, iFrame, 0 );
Vec_IntForEachEntry( p->vVisited, Entry, i )
{
iFrameOld = Vec_IntEntry( p->vVisited, ++i );
Value = Saig_ManBmcLiteral( p, Aig_ManObj(p->pAig, Entry), iFrameOld );
// assert( Value == 0 || Value == 1 || Value == ABC_INFINITY || Value == ABC_INFINITY+1 );
assert( Value == ABC_INFINITY || Value == ABC_INFINITY+1 );
if ( !(Value == ABC_INFINITY || Value == ABC_INFINITY+1) )
printf( "Internal error!\n" );
// if ( Value == 0 || Value == 1 )
// continue;
Saig_ManBmcSetLiteral( p, Aig_ManObj(p->pAig, Entry), iFrameOld, ~0 );
}
if ( iLit < 2 )
return iLit;
return Saig_ManBmcCreateCnf_rec( p, pObj, iFrame, 1 );
}
/**Function*************************************************************
Synopsis [Procedure used for sorting the nodes in decreasing order of levels.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_NodeCompareRefsIncrease( Aig_Obj_t ** pp1, Aig_Obj_t ** pp2 )
{
int Diff = Aig_ObjRefs(*pp1) - Aig_ObjRefs(*pp2);
if ( Diff < 0 )
return -1;
if ( Diff > 0 )
return 1;
Diff = Aig_ObjId(*pp1) - Aig_ObjId(*pp2);
if ( Diff < 0 )
return -1;
if ( Diff > 0 )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Mark PIs to be skipped based on nPisAbstract.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ManBmcMarkPis( Aig_Man_t * pAig, int nPisAbstract )
{
Vec_Ptr_t * vPis;
Aig_Obj_t * pObj;
int i;
if ( nPisAbstract < 1 )
return;
// sort PIs by the number of their fanouts
vPis = Vec_PtrAlloc( 100 );
Saig_ManForEachPi( pAig, pObj, i )
Vec_PtrPush( vPis, pObj );
Vec_PtrSort( vPis, (int (*)(void))Aig_NodeCompareRefsIncrease );
Vec_PtrForEachEntry( Aig_Obj_t *, vPis, pObj, i )
{
if ( i < nPisAbstract )
{
pObj->fMarkA = 1;
// printf( "%d=%d ", Aig_ObjPioNum(pObj), Aig_ObjRefs(pObj) );
}
}
// printf( "\n" );
// print primary inputs
// Saig_ManForEachPi( pAig, pObj, i )
// printf( "%d=%d ", i, Aig_ObjRefs(pObj) );
// printf( "\n" );
}
/**Function*************************************************************
Synopsis [This procedure sets default parameters.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Saig_ParBmcSetDefaultParams( Saig_ParBmc_t * p )
{
memset( p, 0, sizeof(Saig_ParBmc_t) );
p->nStart = 0; // maximum number of timeframes
p->nFramesMax = 2000; // maximum number of timeframes
p->nConfLimit = 2000; // maximum number of conflicts at a node
p->nConfLimitJump = 0; // maximum number of conflicts after jumping
p->nFramesJump = 0; // the number of tiemframes to jump
p->nTimeOut = 0; // approximate timeout in seconds
p->nPisAbstract = 0; // the number of PIs to abstract
p->fSolveAll = 0; // stops on the first SAT instance
p->fDropSatOuts = 0; // replace sat outputs by constant 0
p->fVerbose = 0; // verbose
p->iFrame = -1; // explored up to this frame
p->nFailOuts = 0; // the number of failed outputs
}
/**Function*************************************************************
Synopsis [Bounded model checking engine.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Saig_ManBmcScalable( Aig_Man_t * pAig, Saig_ParBmc_t * pPars )
{
Gia_ManBmc_t * p;
Aig_Obj_t * pObj;
int RetValue = -1, fFirst = 1, nJumpFrame = 0, fUnfinished = 0;
int nOutDigits = Aig_Base10Log( Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) );
int i, f, Lit, status, clk, clk2, clkOther = 0, clkTotal = clock();
int nTimeToStop = time(NULL) + pPars->nTimeOut;
if ( pPars->fVerbose && Aig_ManConstrNum(pAig) > 0 )
printf( "Performing BMC with constraints...\n" );
p = Saig_Bmc3ManStart( pAig );
p->pPars = pPars;
if ( pPars->fVerbose )
{
printf( "AIG: PI/PO/Reg = %d/%d/%d. Node = %6d. Lev = %5d. Map = %6d. Sect =%3d.\n",
Saig_ManPiNum(pAig), Saig_ManPoNum(pAig), Saig_ManRegNum(pAig),
Aig_ManNodeNum(pAig), Aig_ManLevelNum(pAig), (Vec_IntSize(p->vMapping)-Aig_ManObjNumMax(pAig))/5, Vec_VecSize(p->vSects) );
printf( "Params: Start = %d. FramesMax = %d. ConfLimit = %d. TimeOut = %d. SolveAll = %d.\n",
pPars->nStart, pPars->nFramesMax, pPars->nConfLimit, pPars->nTimeOut, pPars->fSolveAll );
}
// set runtime limit
if ( p->pPars->nTimeOut )
sat_solver_set_runtime_limit( p->pSat, nTimeToStop );
// perform frames
Aig_ManRandom( 1 );
Saig_ManBmcMarkPis( pAig, pPars->nPisAbstract );
for ( f = 0; f < pPars->nFramesMax; f++ )
{
// stop BMC after exploring all reachable states
if ( Aig_ManRegNum(pAig) < 30 && f == (1 << Aig_ManRegNum(pAig)) )
{
Saig_Bmc3ManStop( p );
return pPars->nFailOuts ? 0 : 1;
}
// stop BMC if all targets are solved
if ( pPars->fSolveAll && pPars->nFailOuts == Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) )
{
Saig_Bmc3ManStop( p );
return 0;
}
// consider the next timeframe
if ( RetValue == -1 && pPars->nStart == 0 && !nJumpFrame )
pPars->iFrame = f-1;
// resize the array
Vec_IntFillExtra( p->vPiVars, (f+1)*Saig_ManPiNum(p->pAig), 0 );
// map nodes of this section
Vec_PtrPush( p->vId2Var, Vec_IntStartFull(p->nObjNums) );
/*
if ( f > 2*Vec_VecSize(p->vSects) )
{
int iFrameOld = f - 2*Vec_VecSize( p->vSects );
void * pMemory = Vec_IntReleaseArray( Vec_PtrEntry(p->vId2Var, iFrameOld) );
ABC_FREE( pMemory );
}
*/
// prepare some nodes
Saig_ManBmcSetLiteral( p, Aig_ManConst1(pAig), f, 1 );
if ( f == 0 )
Saig_ManForEachLo( p->pAig, pObj, i )
Saig_ManBmcSetLiteral( p, pObj, 0, 0 );
// set PIs to zero if they are marked
Saig_ManForEachPi( p->pAig, pObj, i )
if ( pObj->fMarkA )
Saig_ManBmcSetLiteral( p, pObj, f, Aig_ManRandom(0) & 1 );
// add the constraints for this frame
Saig_ManForEachPo( pAig, pObj, i )
{
if ( i < Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) )
continue;
clk2 = clock();
Lit = Saig_ManBmcCreateCnf( p, pObj, f );
Lit = lit_neg( Lit );
clkOther += clock() - clk2;
status = sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
if ( status == 0 )
{
printf( "SAT problem became UNSAT after adding constraints in frame %d.\n", f );
Saig_Bmc3ManStop( p );
return 1;
}
}
if ( (pPars->nStart && f < pPars->nStart) || (nJumpFrame && f < nJumpFrame) )
continue;
// solve SAT
clk = clock();
Saig_ManForEachPo( pAig, pObj, i )
{
if ( i >= Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) )
break;
// skip solved outputs
if ( p->vCexes && Vec_PtrEntry(p->vCexes, i) )
continue;
// add constraints for this output
clk2 = clock();
Lit = Saig_ManBmcCreateCnf( p, pObj, f );
clkOther += clock() - clk2;
if ( Lit == 0 )
continue;
if ( Lit == 1 )
{
Abc_Cex_t * pCex = Abc_CexMakeTriv( Aig_ManRegNum(pAig), Saig_ManPiNum(pAig), Saig_ManPoNum(pAig), f*Saig_ManPoNum(pAig)+i );
if ( !pPars->fSolveAll )
{
printf( "Output %d is trivially SAT in frame %d.\n", i, f );
ABC_FREE( pAig->pSeqModel );
pAig->pSeqModel = pCex;
Saig_Bmc3ManStop( p );
return 0;
}
pPars->nFailOuts++;
printf( "Output %*d was asserted in frame %2d (solved %*d out of %*d outputs).\n",
nOutDigits, i, f, nOutDigits, pPars->nFailOuts, nOutDigits, Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) );
if ( p->vCexes == NULL )
p->vCexes = Vec_PtrStart( Saig_ManPoNum(pAig) );
Vec_PtrWriteEntry( p->vCexes, i, pCex );
RetValue = 0;
continue;
}
// solve this output
fUnfinished = 0;
sat_solver_compress( p->pSat );
status = sat_solver_solve( p->pSat, &Lit, &Lit + 1, (ABC_INT64_T)pPars->nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( status == l_False )
{/*
Lit = lit_neg( Lit );
status = sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
assert( status );
sat_solver_compress( p->pSat );
*/
}
else if ( status == l_True )
{
int * pModel = Sat_SolverGetModel( p->pSat, Vec_IntArray(p->vPiVars), Vec_IntSize(p->vPiVars) );
Abc_Cex_t * pCex = Abc_CexCreate( Aig_ManRegNum(pAig), Saig_ManPiNum(pAig), pModel, f, i, 1 );
ABC_FREE( pModel );
fFirst = 0;
if ( !pPars->fSolveAll )
{
//ABC_PRT( "CNF generation runtime", clkOther );
if ( pPars->fVerbose )
{
printf( "%3d %s : ", f, fUnfinished ? "-" : "+" );
printf( "Var =%8.0f. ", (double)p->nSatVars );
printf( "Cla =%9.0f. ", (double)p->pSat->stats.clauses );
printf( "Conf =%7.0f. ",(double)p->pSat->stats.conflicts );
printf( "Imp =%10.0f. ", (double)p->pSat->stats.propagations );
ABC_PRT( "Time", clock() - clk );
// ABC_PRM( "Id2Var", (f+1)*p->nObjNums*4 );
// ABC_PRM( "SAT", 42 * p->pSat->size + 16 * (int)p->pSat->stats.clauses + 4 * (int)p->pSat->stats.clauses_literals );
// printf( "Simples = %6d. ", p->nBufNum );
// printf( "Dups = %6d. ", p->nDupNum );
// printf( "\n" );
fflush( stdout );
}
ABC_FREE( pAig->pSeqModel );
pAig->pSeqModel = pCex;
Saig_Bmc3ManStop( p );
return 0;
}
pPars->nFailOuts++;
printf( "Output %*d was asserted in frame %2d (solved %*d out of %*d outputs).\n",
nOutDigits, i, f, nOutDigits, pPars->nFailOuts, nOutDigits, Saig_ManPoNum(pAig) - Saig_ManConstrNum(pAig) );
if ( p->vCexes == NULL )
p->vCexes = Vec_PtrStart( Saig_ManPoNum(pAig) );
Vec_PtrWriteEntry( p->vCexes, i, pCex );
RetValue = 0;
}
else
{
assert( status == l_Undef );
if ( pPars->nTimeOut && time(NULL) > nTimeToStop )
{
printf( "Reached timeout (%d seconds).\n", pPars->nTimeOut );
Saig_Bmc3ManStop( p );
return RetValue;
}
if ( pPars->nFramesJump )
{
pPars->nConfLimit = pPars->nConfLimitJump;
nJumpFrame = f + pPars->nFramesJump;
fUnfinished = 1;
break;
}
Saig_Bmc3ManStop( p );
return RetValue;
}
if ( pPars->nTimeOut && time(NULL) > nTimeToStop )
{
printf( "Reached timeout (%d seconds).\n", pPars->nTimeOut );
Saig_Bmc3ManStop( p );
return RetValue;
}
}
if ( pPars->fVerbose )
{
if ( fFirst == 1 && f > 0 && p->pSat->stats.conflicts > 1 )
{
fFirst = 0;
// printf( "Outputs of frames up to %d are trivially UNSAT.\n", f );
}
printf( "%3d %s : ", f, fUnfinished ? "-" : "+" );
printf( "Var =%8.0f. ", (double)p->nSatVars );
printf( "Cla =%9.0f. ", (double)p->pSat->stats.clauses );
printf( "Conf =%7.0f. ",(double)p->pSat->stats.conflicts );
printf( "Imp =%10.0f. ", (double)p->pSat->stats.propagations );
ABC_PRT( "Time", clock() - clk );
// ABC_PRM( "Id2Var", (f+1)*p->nObjNums*4 );
// ABC_PRM( "SAT", 42 * p->pSat->size + 16 * (int)p->pSat->stats.clauses + 4 * (int)p->pSat->stats.clauses_literals );
// printf( "Simples = %6d. ", p->nBufNum );
// printf( "Dups = %6d. ", p->nDupNum );
// printf( "\n" );
fflush( stdout );
}
}
// consider the next timeframe
if ( nJumpFrame && pPars->nStart == 0 )
pPars->iFrame = nJumpFrame - pPars->nFramesJump;
else if ( RetValue == -1 && pPars->nStart == 0 )
pPars->iFrame = f;
//ABC_PRT( "CNF generation runtime", clkOther );
if ( pPars->fVerbose )
{
// ABC_PRM( "Id2Var", (f+1)*p->nObjNums*4 );
// ABC_PRM( "SAT", 48 * p->pSat->size + 16 * (int)p->pSat->stats.clauses + 4 * (int)p->pSat->stats.clauses_literals );
// printf( "Simples = %6d. ", p->nBufNum );
// printf( "Dups = %6d. ", p->nDupNum );
// printf( "\n" );
}
Saig_Bmc3ManStop( p );
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END