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abc/src/aig/gia/giaSweep.c

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/**CFile****************************************************************
FileName [giaSweep.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Scalable AIG package.]
Synopsis [Sweeping of GIA manager.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: giaSweep.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "gia.h"
#include "giaAig.h"
#include "proof/dch/dch.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Mark GIA nodes that feed into POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Gia_ManFraigCheckCis( Gia_Man_t * p, Gia_Obj_t * pObj )
{
for ( assert( Gia_ObjIsCi(pObj) ); Gia_ObjIsCi(pObj); pObj-- )
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
return 1;
return 0;
}
Gia_Obj_t * Gia_ManFraigMarkCis( Gia_Man_t * p, Gia_Obj_t * pObj, int fMark )
{
for ( assert( Gia_ObjIsCi(pObj) ); Gia_ObjIsCi(pObj); pObj-- )
if ( fMark )
Gia_ObjSetTravIdCurrent( p, pObj );
return pObj;
}
Gia_Obj_t * Gia_ManFraigMarkCos( Gia_Man_t * p, Gia_Obj_t * pObj, int fMark )
{
for ( assert( Gia_ObjIsCo(pObj) ); Gia_ObjIsCo(pObj); pObj-- )
if ( fMark )
{
Gia_ObjSetTravIdCurrent( p, pObj );
Gia_ObjSetTravIdCurrent( p, Gia_ObjFanin0(pObj) );
}
return pObj;
}
Gia_Obj_t * Gia_ManFraigMarkAnd( Gia_Man_t * p, Gia_Obj_t * pObj )
{
for ( assert( Gia_ObjIsAnd(pObj) ); Gia_ObjIsAnd(pObj); pObj-- )
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
{
Gia_ObjSetTravIdCurrent( p, Gia_ObjFanin0(pObj) );
Gia_ObjSetTravIdCurrent( p, Gia_ObjFanin1(pObj) );
}
return pObj;
}
Gia_Man_t * Gia_ManFraigCreateGia( Gia_Man_t * p )
{
Vec_Int_t * vBoxPres;
Gia_Man_t * pNew;
Gia_Obj_t * pObj;
int i, fLabelPos;
assert( p->pManTime != NULL );
// start marks
Gia_ManIncrementTravId( p );
Gia_ObjSetTravIdCurrent( p, Gia_ManConst0(p) );
vBoxPres = Vec_IntAlloc( 1000 );
// mark primary outputs
fLabelPos = 1;
pObj = Gia_ManObj( p, Gia_ManObjNum(p) - 1 );
assert( Gia_ObjIsCo(pObj) );
while ( Gia_ObjIsCo(pObj) )
{
pObj = Gia_ManFraigMarkCos( p, pObj, fLabelPos );
if ( Gia_ObjIsAnd(pObj) )
pObj = Gia_ManFraigMarkAnd( p, pObj );
assert( Gia_ObjIsCi(pObj) );
fLabelPos = Gia_ManFraigCheckCis(p, pObj);
pObj = Gia_ManFraigMarkCis( p, pObj, fLabelPos );
Vec_IntPush( vBoxPres, fLabelPos );
}
Vec_IntPop( vBoxPres );
Vec_IntReverseOrder( vBoxPres );
assert( Gia_ObjIsConst0(pObj) );
// mark primary inputs
Gia_ManForEachObj1( p, pObj, i )
if ( Gia_ObjIsCi(pObj) )
Gia_ObjSetTravIdCurrent( p, pObj );
else
break;
// duplicate marked entries
pNew = Gia_ManStart( Gia_ManObjNum(p) );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManConst0(p)->Value = 0;
Gia_ManForEachObj1( p, pObj, i )
{
if ( !Gia_ObjIsTravIdCurrent(p, pObj) )
continue;
if ( Gia_ObjIsCi(pObj) )
pObj->Value = Gia_ManAppendCi(pNew);
else if ( Gia_ObjIsAnd(pObj) )
pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
else if ( Gia_ObjIsCo(pObj) )
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
else assert( 0 );
}
// update timing manager
pNew->pManTime = Gia_ManUpdateTimMan( p, vBoxPres );
// update extra STG
assert( p->pAigExtra != NULL );
assert( pNew->pAigExtra == NULL );
pNew->pAigExtra = Gia_ManUpdateExtraAig( p->pManTime, p->pAigExtra, vBoxPres );
Vec_IntFree( vBoxPres );
// assert( Gia_ManPiNum(pNew) == Tim_ManCiNum(pNew->pManTime) );
// assert( Gia_ManPoNum(pNew) == Tim_ManCoNum(pNew->pManTime) );
// assert( Gia_ManPiNum(pNew) == Tim_ManPiNum(pNew->pManTime) + Gia_ManPoNum(pNew->pAigExtra) );
return pNew;
}
/**Function*************************************************************
Synopsis [Duplicates the AIG in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Gia_ObjFanin0CopyRepr( Gia_Man_t * p, Gia_Obj_t * pObj, int * pReprs )
{
int fanId = Gia_ObjFaninId0p( p, pObj );
if ( pReprs[fanId] == -1 )
return Gia_ObjFanin0Copy( pObj );
assert( Abc_Lit2Var(pReprs[fanId]) < Gia_ObjId(p, pObj) );
return Abc_LitNotCond( Gia_ObjValue(Gia_ManObj(p, Abc_Lit2Var(pReprs[fanId]))), Gia_ObjFaninC0(pObj) ^ Abc_LitIsCompl(pReprs[fanId]) );
}
int Gia_ObjFanin1CopyRepr( Gia_Man_t * p, Gia_Obj_t * pObj, int * pReprs )
{
int fanId = Gia_ObjFaninId1p( p, pObj );
if ( pReprs[fanId] == -1 )
return Gia_ObjFanin1Copy( pObj );
assert( Abc_Lit2Var(pReprs[fanId]) < Gia_ObjId(p, pObj) );
return Abc_LitNotCond( Gia_ObjValue(Gia_ManObj(p, Abc_Lit2Var(pReprs[fanId]))), Gia_ObjFaninC1(pObj) ^ Abc_LitIsCompl(pReprs[fanId]) );
}
Gia_Man_t * Gia_ManFraigReduceGia( Gia_Man_t * p, int * pReprs )
{
Gia_Man_t * pNew;
Gia_Obj_t * pObj;
int i;
assert( pReprs != NULL );
assert( Gia_ManRegNum(p) == 0 );
pNew = Gia_ManStart( Gia_ManObjNum(p) );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManFillValue( p );
Gia_ManHashAlloc( pNew );
Gia_ManForEachObj( p, pObj, i )
{
if ( Gia_ObjIsAnd(pObj) )
pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0CopyRepr(p, pObj, pReprs), Gia_ObjFanin1CopyRepr(p, pObj, pReprs) );
else if ( Gia_ObjIsCi(pObj) )
pObj->Value = Gia_ManAppendCi( pNew );
else if ( Gia_ObjIsCo(pObj) )
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0CopyRepr(p, pObj, pReprs) );
else if ( Gia_ObjIsConst0(pObj) )
pObj->Value = 0;
else assert( 0 );
}
Gia_ManHashStop( pNew );
return pNew;
}
/**Function*************************************************************
Synopsis [Computes representatives in terms of the original objects.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int * Gia_ManFraigSelectReprs( Gia_Man_t * p, Gia_Man_t * pGia, int fVerbose )
{
Gia_Obj_t * pObj;
int * pReprs = ABC_FALLOC( int, Gia_ManObjNum(p) );
int * pGia2Abc = ABC_FALLOC( int, Gia_ManObjNum(pGia) );
int i, iLitGia, iLitGia2, iReprGia, fCompl;
int nConsts = 0, nReprs = 0;
pGia2Abc[0] = 0;
Gia_ManSetPhase( pGia );
Gia_ManForEachObj1( p, pObj, i )
{
if ( Gia_ObjIsCo(pObj) )
continue;
assert( Gia_ObjIsCi(pObj) || Gia_ObjIsAnd(pObj) );
iLitGia = Gia_ObjValue(pObj);
if ( iLitGia == -1 )
continue;
iReprGia = Gia_ObjReprSelf( pGia, Abc_Lit2Var(iLitGia) );
if ( pGia2Abc[iReprGia] == -1 )
pGia2Abc[iReprGia] = i;
else
{
iLitGia2 = Gia_ObjValue( Gia_ManObj(p, pGia2Abc[iReprGia]) );
assert( Gia_ObjReprSelf(pGia, Abc_Lit2Var(iLitGia)) == Gia_ObjReprSelf(pGia, Abc_Lit2Var(iLitGia2)) );
fCompl = Abc_LitIsCompl(iLitGia) ^ Abc_LitIsCompl(iLitGia2);
fCompl ^= Gia_ManObj(pGia, Abc_Lit2Var(iLitGia))->fPhase;
fCompl ^= Gia_ManObj(pGia, Abc_Lit2Var(iLitGia2))->fPhase;
pReprs[i] = Abc_Var2Lit( pGia2Abc[iReprGia], fCompl );
assert( Abc_Lit2Var(pReprs[i]) < i );
if ( pGia2Abc[iReprGia] == 0 )
nConsts++;
else
nReprs++;
}
}
ABC_FREE( pGia2Abc );
if ( fVerbose )
printf( "Found %d const reprs and %d other reprs.\n", nConsts, nReprs );
return pReprs;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManFraigSweepPerform( Gia_Man_t * p, void * pPars )
{
Aig_Man_t * pNew;
pNew = Gia_ManToAigSimple( p );
assert( Gia_ManObjNum(p) == Aig_ManObjNum(pNew) );
Dch_ComputeEquivalences( pNew, (Dch_Pars_t *)pPars );
Gia_ManReprFromAigRepr( pNew, p );
Aig_ManStop( pNew );
}
/**Function*************************************************************
Synopsis [Reduces root model with scorr.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManFraigSweep( Gia_Man_t * p, void * pPars )
{
Gia_Man_t * pGia, * pNew, * pTemp;
int * pReprs;
assert( Gia_ManRegNum(p) == 0 );
if ( p->pManTime == NULL )
{
Gia_ManFraigSweepPerform( p, pPars );
pNew = Gia_ManEquivReduce( p, 1, 0, 0, 0 );
if ( pNew == NULL )
return Gia_ManDup(p);
return pNew;
}
if ( p->pAigExtra == NULL )
{
printf( "Timing manager is given but there is no GIA of boxes.\n" );
return NULL;
}
// order AIG objects
pNew = Gia_ManDupUnnormalize( p );
if ( pNew == NULL )
return NULL;
// find global equivalences
pNew->pManTime = p->pManTime;
pGia = Gia_ManDupCollapse( pNew, p->pAigExtra, NULL );
pNew->pManTime = NULL;
Gia_ManFraigSweepPerform( pGia, pPars );
// transfer equivalences
pReprs = Gia_ManFraigSelectReprs( pNew, pGia, ((Dch_Pars_t *)pPars)->fVerbose );
Gia_ManStop( pGia );
// reduce AIG
pNew = Gia_ManFraigReduceGia( pTemp = pNew, pReprs );
Gia_ManStop( pTemp );
ABC_FREE( pReprs );
// derive new AIG
assert( pNew->pManTime == NULL );
assert( pNew->pAigExtra == NULL );
pNew->pManTime = p->pManTime;
pNew->pAigExtra = p->pAigExtra;
pNew->nAnd2Delay = p->nAnd2Delay;
pNew = Gia_ManFraigCreateGia( pTemp = pNew );
assert( pTemp->pManTime == p->pManTime );
assert( pTemp->pAigExtra == p->pAigExtra );
pTemp->pManTime = NULL;
pTemp->pAigExtra = NULL;
Gia_ManStop( pTemp );
// normalize the result
pNew = Gia_ManDupNormalize( pTemp = pNew );
Gia_ManTransferTiming( pNew, pTemp );
Gia_ManStop( pTemp );
// return the result
assert( pNew->pManTime != NULL );
assert( pNew->pAigExtra != NULL );
return pNew;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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