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/**CFile****************************************************************
FileName [giaChoice.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Scalable AIG package.]
Synopsis [Normalization of structural choices.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: giaChoice.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "gia.h"
#include "giaAig.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Reverse the order of nodes in equiv classes.]
Description [If the flag is 1, assumed current increasing order ]
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManReverseClasses( Gia_Man_t * p, int fNowIncreasing )
{
Vec_Int_t * vCollected;
Vec_Int_t * vClass;
int i, k, iRepr, iNode, iPrev;
// collect classes
vCollected = Vec_IntAlloc( 100 );
Gia_ManForEachClass( p, iRepr )
{
Vec_IntPush( vCollected, iRepr );
/*
// check classes
if ( !fNowIncreasing )
{
iPrev = iRepr;
Gia_ClassForEachObj1( p, iRepr, iNode )
{
if ( iPrev < iNode )
{
printf( "Class %d : ", iRepr );
Gia_ClassForEachObj( p, iRepr, iNode )
printf( " %d", iNode );
printf( "\n" );
break;
}
iPrev = iNode;
}
}
*/
}
// correct each class
vClass = Vec_IntAlloc( 100 );
Vec_IntForEachEntry( vCollected, iRepr, i )
{
Vec_IntClear( vClass );
Vec_IntPush( vClass, iRepr );
Gia_ClassForEachObj1( p, iRepr, iNode )
{
if ( fNowIncreasing )
assert( iRepr < iNode );
// else
// assert( iRepr > iNode );
Vec_IntPush( vClass, iNode );
}
if ( !fNowIncreasing )
Vec_IntSort( vClass, 1 );
// if ( iRepr == 129720 || iRepr == 129737 )
// Vec_IntPrint( vClass );
// reverse the class
iPrev = 0;
iRepr = Vec_IntEntryLast( vClass );
Vec_IntForEachEntry( vClass, iNode, k )
{
if ( fNowIncreasing )
Gia_ObjSetReprRev( p, iNode, iNode == iRepr ? GIA_VOID : iRepr );
else
Gia_ObjSetRepr( p, iNode, iNode == iRepr ? GIA_VOID : iRepr );
Gia_ObjSetNext( p, iNode, iPrev );
iPrev = iNode;
}
}
Vec_IntFree( vCollected );
Vec_IntFree( vClass );
// verify
Gia_ManForEachClass( p, iRepr )
Gia_ClassForEachObj1( p, iRepr, iNode )
if ( fNowIncreasing )
assert( Gia_ObjRepr(p, iNode) == iRepr && iRepr > iNode );
else
assert( Gia_ObjRepr(p, iNode) == iRepr && iRepr < iNode );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManVerifyChoices( Gia_Man_t * p )
{
Gia_Obj_t * pObj;
int i, iRepr, iNode, fProb = 0;
assert( p->pReprs );
// mark nodes
Gia_ManCleanMark0(p);
Gia_ManForEachClass( p, iRepr )
Gia_ClassForEachObj1( p, iRepr, iNode )
{
if ( Gia_ObjIsHead(p, iNode) )
printf( "Member %d of choice class %d is a representative.\n", iNode, iRepr ), fProb = 1;
if ( Gia_ManObj( p, iNode )->fMark0 == 1 )
printf( "Node %d participates in more than one choice node.\n", iNode ), fProb = 1;
Gia_ManObj( p, iNode )->fMark0 = 1;
}
Gia_ManCleanMark0(p);
Gia_ManForEachObj( p, pObj, i )
{
if ( Gia_ObjIsAnd(pObj) )
{
if ( Gia_ObjHasRepr(p, Gia_ObjFaninId0(pObj, i)) )
printf( "Fanin 0 of AND node %d has a repr.\n", i ), fProb = 1;
if ( Gia_ObjHasRepr(p, Gia_ObjFaninId1(pObj, i)) )
printf( "Fanin 1 of AND node %d has a repr.\n", i ), fProb = 1;
}
else if ( Gia_ObjIsCo(pObj) )
{
if ( Gia_ObjHasRepr(p, Gia_ObjFaninId0(pObj, i)) )
printf( "Fanin 0 of CO node %d has a repr.\n", i ), fProb = 1;
}
}
if ( !fProb )
printf( "GIA with choices is correct.\n" );
}
/**Function*************************************************************
Synopsis [Make sure reprsentative nodes do not have representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Gia_ManCheckReprs( Gia_Man_t * p )
{
Gia_Obj_t * pObj;
int i, fProb = 0;
Gia_ManForEachObj( p, pObj, i )
{
if ( !Gia_ObjHasRepr(p, i) )
continue;
if ( !Gia_ObjIsAnd(pObj) )
printf( "Obj %d is not an AND but it has a repr %d.\n", i, Gia_ObjRepr(p, i) ), fProb = 1;
else if ( Gia_ObjHasRepr( p, Gia_ObjRepr(p, i) ) )
printf( "Obj %d has repr %d with a repr %d.\n", i, Gia_ObjRepr(p, i), Gia_ObjRepr(p, Gia_ObjRepr(p, i)) ), fProb = 1;
}
if ( !fProb )
printf( "GIA \"%s\": Representive verification successful.\n", Gia_ManName(p) );
}
/**Function*************************************************************
Synopsis [Find minimum level of each node using representatives.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Gia_ManMinLevelRepr_rec( Gia_Man_t * p, Gia_Obj_t * pObj )
{
int levMin, levCur, objId, reprId;
// skip visited nodes
if ( Gia_ObjIsTravIdCurrent(p, pObj) )
return Gia_ObjLevel(p, pObj);
Gia_ObjSetTravIdCurrent(p, pObj);
// skip CI nodes
if ( Gia_ObjIsCi(pObj) )
return Gia_ObjLevel(p, pObj);
assert( Gia_ObjIsAnd(pObj) );
objId = Gia_ObjId(p, pObj);
if ( Gia_ObjIsNone(p, objId) )
{
// not part of the equivalence class
Gia_ManMinLevelRepr_rec( p, Gia_ObjFanin0(pObj) );
Gia_ManMinLevelRepr_rec( p, Gia_ObjFanin1(pObj) );
Gia_ObjSetAndLevel( p, pObj );
return Gia_ObjLevel(p, pObj);
}
// has equivalences defined
assert( Gia_ObjHasRepr(p, objId) || Gia_ObjIsHead(p, objId) );
reprId = Gia_ObjHasRepr(p, objId) ? Gia_ObjRepr(p, objId) : objId;
// iterate through objects
levMin = ABC_INFINITY;
Gia_ClassForEachObj( p, reprId, objId )
{
levCur = Gia_ManMinLevelRepr_rec( p, Gia_ManObj(p, objId) );
levMin = Abc_MinInt( levMin, levCur );
}
assert( levMin < ABC_INFINITY );
// assign minimum level to all
Gia_ClassForEachObj( p, reprId, objId )
Gia_ObjSetLevelId( p, objId, levMin );
return levMin;
}
int Gia_ManMinLevelRepr( Gia_Man_t * p )
{
Gia_Obj_t * pObj;
int i, LevelCur, LevelMax = 0;
assert( Gia_ManRegNum(p) == 0 );
Gia_ManCleanLevels( p, Gia_ManObjNum(p) );
Gia_ManIncrementTravId( p );
Gia_ManForEachAnd( p, pObj, i )
{
assert( !Gia_ObjIsConst(p, i) );
LevelCur = Gia_ManMinLevelRepr_rec( p, pObj );
LevelMax = Abc_MaxInt( LevelMax, LevelCur );
}
printf( "Max level %d\n", LevelMax );
return LevelMax;
}
/**Function*************************************************************
Synopsis [Returns mapping of each old repr into new repr.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int * Gia_ManFindMinLevelMap( Gia_Man_t * p )
{
Gia_Obj_t * pObj;
int reprId, objId, levFan0, levFan1;
int levMin, levMinOld, levMax, reprBest;
int * pReprMap, * pMinLevels, iFanin;
int i, fChange = 1;
Gia_ManLevelNum( p );
pMinLevels = ABC_ALLOC( int, Gia_ManObjNum(p) );
while ( fChange )
{
fChange = 0;
// clean min-levels
memset( pMinLevels, 0xFF, sizeof(int) * Gia_ManObjNum(p) );
// for each class find min level
Gia_ManForEachClass( p, reprId )
{
levMin = ABC_INFINITY;
Gia_ClassForEachObj( p, reprId, objId )
levMin = Abc_MinInt( levMin, Gia_ObjLevelId(p, objId) );
assert( levMin >= 0 && levMin < ABC_INFINITY );
Gia_ClassForEachObj( p, reprId, objId )
{
assert( pMinLevels[objId] == -1 );
pMinLevels[objId] = levMin;
}
}
// recompute levels
levMax = 0;
Gia_ManForEachAnd( p, pObj, i )
{
iFanin = Gia_ObjFaninId0(pObj, i);
if ( Gia_ObjIsNone(p, iFanin) )
levFan0 = Gia_ObjLevelId(p, iFanin);
else if ( Gia_ObjIsConst(p, iFanin) )
levFan0 = 0;
else
{
assert( Gia_ObjIsClass( p, iFanin ) );
assert( pMinLevels[iFanin] >= 0 );
levFan0 = pMinLevels[iFanin];
}
iFanin = Gia_ObjFaninId1(pObj, i);
if ( Gia_ObjIsNone(p, iFanin) )
levFan1 = Gia_ObjLevelId(p, iFanin);
else if ( Gia_ObjIsConst(p, iFanin) )
levFan1 = 0;
else
{
assert( Gia_ObjIsClass( p, iFanin ) );
assert( pMinLevels[iFanin] >= 0 );
levFan1 = pMinLevels[iFanin];
}
levMinOld = Gia_ObjLevelId(p, i);
levMin = 1 + Abc_MaxInt( levFan0, levFan1 );
Gia_ObjSetLevelId( p, i, levMin );
assert( levMin <= levMinOld );
if ( levMin < levMinOld )
fChange = 1;
levMax = Abc_MaxInt( levMax, levMin );
}
printf( "%d ", levMax );
}
ABC_FREE( pMinLevels );
printf( "\n" );
// create repr map
pReprMap = ABC_FALLOC( int, Gia_ManObjNum(p) );
Gia_ManForEachAnd( p, pObj, i )
if ( Gia_ObjIsConst(p, i) )
pReprMap[i] = 0;
Gia_ManForEachClass( p, reprId )
{
// find min-level repr
reprBest = -1;
levMin = ABC_INFINITY;
Gia_ClassForEachObj( p, reprId, objId )
if ( levMin > Gia_ObjLevelId(p, objId) )
{
levMin = Gia_ObjLevelId(p, objId);
reprBest = objId;
}
assert( reprBest > 0 );
Gia_ClassForEachObj( p, reprId, objId )
pReprMap[objId] = reprBest;
}
return pReprMap;
}
/**Function*************************************************************
Synopsis [Find terminal AND nodes]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Gia_ManDanglingAndNodes( Gia_Man_t * p )
{
Vec_Int_t * vTerms;
Gia_Obj_t * pObj;
int i;
Gia_ManCleanMark0( p );
Gia_ManForEachAnd( p, pObj, i )
{
Gia_ObjFanin0(pObj)->fMark0 = 1;
Gia_ObjFanin1(pObj)->fMark1 = 1;
}
vTerms = Vec_IntAlloc( 1000 );
Gia_ManForEachAnd( p, pObj, i )
if ( !pObj->fMark0 )
Vec_IntPush( vTerms, i );
Gia_ManCleanMark0( p );
return vTerms;
}
/**Function*************************************************************
Synopsis [Reconstruct AIG starting with terminals.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Gia_ManRebuidRepr_rec( Gia_Man_t * pNew, Gia_Man_t * p, Gia_Obj_t * pObj, int * pReprMap )
{
int objId, reprLit = -1;
if ( ~pObj->Value )
return pObj->Value;
assert( Gia_ObjIsAnd(pObj) );
objId = Gia_ObjId( p, pObj );
if ( Gia_ObjIsClass(p, objId) )
{
assert( pReprMap[objId] > 0 );
reprLit = Gia_ManRebuidRepr_rec( pNew, p, Gia_ManObj(p, pReprMap[objId]), pReprMap );
assert( reprLit > 1 );
}
else
assert( Gia_ObjIsNone(p, objId) );
Gia_ManRebuidRepr_rec( pNew, p, Gia_ObjFanin0(pObj), pReprMap );
Gia_ManRebuidRepr_rec( pNew, p, Gia_ObjFanin1(pObj), pReprMap );
pObj->Value = Gia_ManAppendAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
assert( reprLit != (int)pObj->Value );
if ( reprLit > 1 )
pNew->pReprs[ Abc_Lit2Var(pObj->Value) ].iRepr = Abc_Lit2Var(reprLit);
return pObj->Value;
}
Gia_Man_t * Gia_ManRebuidRepr( Gia_Man_t * p, int * pReprMap )
{
Vec_Int_t * vTerms;
Gia_Man_t * pNew;
Gia_Obj_t * pObj;
int i;
Gia_ManFillValue( p );
pNew = Gia_ManStart( Gia_ManObjNum(p) );
Gia_ManConst0(p)->Value = 0;
Gia_ManForEachCi( p, pObj, i )
pObj->Value = Gia_ManAppendCi(pNew);
vTerms = Gia_ManDanglingAndNodes( p );
Gia_ManForEachObjVec( vTerms, p, pObj, i )
Gia_ManRebuidRepr_rec( pNew, p, pObj, pReprMap );
Vec_IntFree( vTerms );
Gia_ManForEachCo( p, pObj, i )
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
return pNew;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Gia_ManNormalizeChoices( Aig_Man_t * pAig )
{
int * pReprMap;
Aig_Man_t * pNew;
Gia_Man_t * pGia, * pTemp;
// create GIA with representatives
assert( Aig_ManRegNum(pAig) == 0 );
assert( pAig->pReprs != NULL );
pGia = Gia_ManFromAigSimple( pAig );
Gia_ManReprFromAigRepr2( pAig, pGia );
// verify that representatives are correct
Gia_ManCheckReprs( pGia );
// find min-level repr for each class
pReprMap = Gia_ManFindMinLevelMap( pGia );
// reconstruct using correct order
pGia = Gia_ManRebuidRepr( pTemp = pGia, pReprMap );
Gia_ManStop( pTemp );
ABC_FREE( pReprMap );
// create choices
// verify that choices are correct
// Gia_ManVerifyChoices( pGia );
// copy the result back into AIG
pNew = Gia_ManToAigSimple( pGia );
Gia_ManReprToAigRepr( pNew, pGia );
return pNew;
}
void Gia_ManNormalizeChoicesTest( Aig_Man_t * pAig )
{
Aig_Man_t * pNew = Gia_ManNormalizeChoices( pAig );
Aig_ManStop( pNew );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
