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Scalable gate-level abstraction.

This commit is contained in:
Alan Mishchenko 2012-07-28 12:18:59 -07:00
parent 18737f7408
commit 4598c76e88
1 changed files with 72 additions and 24 deletions
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96
src/aig/gia/giaAbsGla2.c
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@ -55,6 +55,7 @@ struct Ga2_Man_t_
Vec_Ptr_t * vId2Lit; // mapping, for each timeframe, of object ID into SAT literal
sat_solver2 * pSat; // incremental SAT solver
int nSatVars; // the number of SAT variables
int nProofIds; // the counter of proof IDs
// temporaries
Vec_Int_t * vCnf;
Vec_Int_t * vLits;
@ -638,7 +639,7 @@ void Ga2_ManAddToAbs( Ga2_Man_t * p, Vec_Int_t * vToAdd )
{
Vec_Int_t * vLeaves, * vMap;
Gia_Obj_t * pObj, * pFanin;
int i, k;
int f, i, k, iLitOut;
// add abstraction objects
Gia_ManForEachObjVec( vToAdd, p->pGia, pObj, i )
{
@ -652,9 +653,38 @@ void Ga2_ManAddToAbs( Ga2_Man_t * p, Vec_Int_t * vToAdd )
Gia_ManForEachObjVec( vLeaves, p->pGia, pFanin, k, )
Ga2_ManSetupNode( p, pObj, 0 );
}
// clean mapping into timeframes
// clean mapping in the timeframes
Vec_PtrForEachEntry( Vec_Int_t *, p->vId2Lit, vMap, i )
Vec_IntFillExtra( vMap, Vec_IntSize(p->vValues), -1 );
// add new clauses to the timeframes
for ( f = 0; f < p->pPars->iFrame; f++ )
Gia_ManForEachObjVec( vToAdd, p->pGia, pObj, i )
{
iLitOut = Ga2_ObjFindOrAddLit( p, pObj, f );
vLeaves = Ga2_ObjLeaves( p, pObj );
Vec_IntClear( p->vLits );
Gia_ManForEachObjVec( vLeaves, p->pGia, pFanin, k, )
Vec_IntPush( p->vLits, Ga2_ObjFindOrAddLit( p, pFanin, f ) );
Ga2_ManCnfAddStatic( p, Ga2_ObjCnf0(p, pObj), Ga2_ObjCnf1(p, pObj), Vec_IntArray(p->vLits), iLitOut, p->nProofIds + i );
}
}
void Ga2_ManAddAbsClauses( Ga2_Man_t * p, int f )
{
Vec_Int_t * vLeaves;
Gia_Obj_t * pObj, * pFanin;
int i, k, iLitOut;
Gia_ManForEachObjVec( p->vAbs, p->pGia, pObj, i )
{
if ( i < p->LimAbs )
continue;
iLitOut = Ga2_ObjFindOrAddLit( p, pObj, f );
vLeaves = Ga2_ObjLeaves( p, pObj );
Vec_IntClear( p->vLits );
Gia_ManForEachObjVec( vLeaves, p->pGia, pFanin, k, )
Vec_IntPush( p->vLits, Ga2_ObjFindOrAddLit( p, pFanin, f ) );
Ga2_ManCnfAddStatic( p, Ga2_ObjCnf0(p, pObj), Ga2_ObjCnf1(p, pObj), Vec_IntArray(p->vLits), iLitOut, i - p->LimAbs );
}
}
void Ga2_ManShrinkAbs( Ga2_Man_t * p, int nAbs, int nValues )
@ -763,6 +793,7 @@ void Ga2_ManRestart( Ga2_Man_t * p )
Vec_IntFree( vToAdd );
p->LimAbs = Vec_IntSize(p->vAbs) + 1;
p->LimPpi = Vec_IntSize(p->vValues);
p->nProofIds = 0;
// set runtime limit
if ( p->pPars->nTimeOut )
sat_solver2_set_runtime_limit( p->pSat, p->pPars->nTimeOut * CLOCKS_PER_SEC + p->timeStart );
@ -781,15 +812,26 @@ void Ga2_ManRestart( Ga2_Man_t * p )
***********************************************************************/
int Ga2_ManUnroll_rec( Ga2_Man_t * p, Gia_Obj_t * pObj, int f )
{
int fSimple = 1;
unsigned uTruth;
Vec_Int_t * vLeaves;
Gia_Obj_t * pLeaf;
unsigned uTruth;
int nLeaves, * pLeaves;
int i, Lit, pLits[5];
if ( Gia_ObjIsCo(pObj) )
return Abc_LitNotCond( Ga2_ManUnroll_rec(p, Gia_ObjFanin0(pObj), f), Gia_ObjFaninC0(pObj) );
if ( Gia_ObjIsConst0(pObj) || (f==0 && Gia_ObjIsRo(p->pGia, pObj)) )
{
if ( fSimple )
{
Lit = Ga2_ObjFindOrAddLit( p, pObj, f );
Lit = Abc_LitNot(Lit);
sat_solver2_addclause( p->pSat, &Lit, &Lit + 1, -1 );
assert( Lit > 1 );
return Lit;
}
return 0;
}
Lit = Ga2_ObjFindLit( p, pObj, f );
if ( Lit >= 0 )
return Lit;
@ -802,6 +844,18 @@ int Ga2_ManUnroll_rec( Ga2_Man_t * p, Gia_Obj_t * pObj, int f )
Ga2_ObjAddLit( p, pObj, f, Lit );
return Lit;
}
if ( fSimple )
{
// collect fanin literals
vLeaves = Ga2_ObjLeaves( p, pObj );
Gia_ManForEachObjVec( vLeaves, p->pGia, pLeaf, i )
pLits[i] = Ga2_ManUnroll_rec( p, pLeaf, f );
// create fanout literal
Lit = Ga2_ObjFindOrAddLit( p, pObj, f );
// create clauses
Ga2_ManCnfAddStatic( p, Ga2_ObjCnf0(p, pObj), Ga2_ObjCnf1(p, pObj), pLits, Lit, -1 );
return Lit;
}
// collect fanin literals
nLeaves = Ga2_ObjLeaveNum( p, pObj );
pLeaves = Ga2_ObjLeavePtr( p, pObj );
@ -809,7 +863,7 @@ int Ga2_ManUnroll_rec( Ga2_Man_t * p, Gia_Obj_t * pObj, int f )
{
pLeaf = Gia_ManObj( p->pGia, pLeaves[i] );
if ( Ga2_ObjIsAbs(p, pLeaf) ) // belongs to original abstraction
pLits[i] = Ga2_ManUnroll_rec( p, pObj, f );
pLits[i] = Ga2_ManUnroll_rec( p, pLeaf, f );
else if ( Ga2_ObjIsPPI(p, pLeaf) ) // belongs to original PPIs
pLits[i] = GA2_BIG_NUM + i;
else
@ -1004,7 +1058,7 @@ static inline int Ga2_ObjSatValue( Ga2_Man_t * p, Gia_Obj_t * pObj, int f )
int Lit = Ga2_ObjFindLit( p, pObj, f );
if ( Lit == -1 )
return 0;
return Abc_LitIsCompl( Lit ) ^ sat_solver2_var_value( p->pSat, Abc_Lit2Var(Lit) );
return Abc_LitIsCompl(Lit) ^ sat_solver2_var_value( p->pSat, Abc_Lit2Var(Lit) );
}
void Ga2_GlaPrepareCexAndMap( Ga2_Man_t * p, Abc_Cex_t ** ppCex, Vec_Int_t ** pvMaps )
{
@ -1014,24 +1068,14 @@ void Ga2_GlaPrepareCexAndMap( Ga2_Man_t * p, Abc_Cex_t ** ppCex, Vec_Int_t ** pv
int f, i, k;
// find PIs and PPIs
vMap = Vec_IntAlloc( 1000 );
Gia_ManForEachObjVec( p->vAbs, p->pGia, pObj, i )
Gia_ManForEachObjVec( p->vValues, p->pGia, pObj, i )
{
if ( Gia_ObjIsAnd(pObj) )
{
if ( !Gia_ObjFanin0(pObj)->fMark0 ) // not used
Vec_IntPush( vMap, Gia_ObjFaninId0p(p->pGia, pObj) );
if ( !Gia_ObjFanin0(pObj)->fMark1 ) // not used
Vec_IntPush( vMap, Gia_ObjFaninId1p(p->pGia, pObj) );
}
else if ( Gia_ObjIsRo(p->pGia, pObj) )
{
pObj = Gia_ObjRoToRi( p->pGia, pObj );
if ( !Gia_ObjFanin0(pObj)->fMark0 ) // not used
Vec_IntPush( vMap, Gia_ObjFaninId0p(p->pGia, pObj) );
}
else assert( 0 );
if ( Ga2_ObjIsAbs(p, pObj) )
continue;
assert( Ga2_ObjIsPPI(p, pObj) );
assert( Gia_ObjIsAnd(pObj) || Gia_ObjIsCi(pObj) );
Vec_IntPush( vMap, Gia_ObjId(p->pGia, pObj) );
}
Vec_IntUniqify( vMap );
// derive counter-example
pCex = Abc_CexAlloc( 0, Vec_IntSize(vMap), p->pPars->iFrame+1 );
pCex->iFrame = p->pPars->iFrame;
@ -1065,6 +1109,8 @@ Vec_Int_t * Ga2_ManRefine( Ga2_Man_t * p )
{
Abc_Cex_t * pCex;
Vec_Int_t * vMap, * vVec;
Gia_Obj_t * pObj;
int i;
Ga2_GlaPrepareCexAndMap( p, &pCex, &vMap );
vVec = Rnm_ManRefine( p->pRnm, pCex, vMap, p->pPars->fPropFanout, 1 );
Abc_CexFree( pCex );
@ -1077,9 +1123,9 @@ Vec_Int_t * Ga2_ManRefine( Ga2_Man_t * p )
return NULL;
}
Vec_IntFree( vMap );
// remap them into GLA objects
// Gia_ManForEachObjVec( vVec, p->pGia, pObj, i )
// Vec_IntWriteEntry( vVec, i, p->pObj2Obj[Gia_ObjId(p->pGia, pObj)] );
// these objects should be PPIs that are not abstracted yet
Gia_ManForEachObjVec( vVec, p->pGia, pObj, i )
assert( Ga2_ObjIsPPI(p, pObj) && !Ga2_ObjIsAbs(p, pObj) );
p->nObjAdded += Vec_IntSize(vVec);
return vVec;
}
@ -1149,6 +1195,8 @@ int Ga2_ManPerform( Gia_Man_t * pAig, Gia_ParVta_t * pPars )
for ( f = 0; !pPars->nFramesMax || f < pPars->nFramesMax; f++ )
{
p->pPars->iFrame = f;
// add abstraction clauses
Ga2_ManAddAbsClauses( p, f );
// get the output literal
Lit = Ga2_ManUnroll_rec( p, Gia_ManPo(pAig,0), f );
// check for counter-examples