/**Function*************************************************************
Synopsis [Performs structural hashing on the LUT functions.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void * Dsm_ManDeriveGia( void * pGia, int fUseMuxes )
{
Gia_Man_t * p = (Gia_Man_t *)pGia;
Gia_Man_t * pNew, * pTemp;
Vec_Int_t * vCover, * vLeaves;
Gia_Obj_t * pObj;
int k, i, iLut, iVar;
word * pTruth;
assert( Gia_ManHasMapping(p) );
// create new manager
pNew = Gia_ManStart( 6*Gia_ManObjNum(p)/5 + 100 );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
pNew->vLevels = Vec_IntStart( 6*Gia_ManObjNum(p)/5 + 100 );
if ( fUseMuxes )
pNew->pMuxes = ABC_CALLOC( unsigned, pNew->nObjsAlloc );
// map primary inputs
Gia_ManFillValue(p);
Gia_ManConst0(p)->Value = 0;
Gia_ManForEachCi( p, pObj, i )
pObj->Value = Gia_ManAppendCi(pNew);
// iterate through nodes used in the mapping
vLeaves = Vec_IntAlloc( 16 );
vCover = Vec_IntAlloc( 1 << 16 );
Gia_ManHashStart( pNew );
Gia_ObjComputeTruthTableStart( p, Gia_ManLutSizeMax(p) );
Gia_ManForEachAnd( p, pObj, iLut )
{
if ( Gia_ObjIsBuf(pObj) )
{
pObj->Value = Gia_ManAppendBuf( pNew, Gia_ObjFanin0Copy(pObj) );
continue;
}
if ( !Gia_ObjIsLut(p, iLut) )
continue;
// collect leaves
Vec_IntClear( vLeaves );
Gia_LutForEachFanin( p, iLut, iVar, k )
Vec_IntPush( vLeaves, iVar );
pTruth = Gia_ObjComputeTruthTableCut( p, Gia_ManObj(p, iLut), vLeaves );
// collect incoming literals
Vec_IntClear( vLeaves );
Gia_LutForEachFanin( p, iLut, iVar, k )
Vec_IntPush( vLeaves, Gia_ManObj(p, iVar)->Value );
Gia_ManObj(p, iLut)->Value = Dsm_ManTruthToGia( pNew, pTruth, vLeaves, vCover );
}
Gia_ObjComputeTruthTableStop( p );
Gia_ManForEachCo( p, pObj, i )
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
Gia_ManHashStop( pNew );
Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
Vec_IntFree( vLeaves );
Vec_IntFree( vCover );
/*
Gia_ManForEachAnd( pNew, pObj, i )
{
int iLev = Gia_ObjLevelId(pNew, i);
int iLev0 = Gia_ObjLevelId(pNew, Gia_ObjFaninId0(pObj, i));
int iLev1 = Gia_ObjLevelId(pNew, Gia_ObjFaninId1(pObj, i));
assert( iLev == 1 + Abc_MaxInt(iLev0, iLev1) );
}
*/
// perform cleanup
pNew = Gia_ManCleanup( pTemp = pNew );
Gia_ManStop( pTemp );
return pNew;
}
/**Function*************************************************************
Synopsis [Performs AIG shrinking using the current mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManMapShrink4( Gia_Man_t * p, int fKeepLevel, int fVerbose )
{
Vec_Int_t * vLeaves, * vTruth, * vVisited, * vLeavesBest;
Gia_Man_t * pNew, * pTemp;
Gia_Obj_t * pObj, * pFanin;
unsigned * pTruth;
int i, k, iFan;
abctime clk = Abc_Clock();
// int ClassCounts[222] = {0};
int * pLutClass, Counter = 0;
assert( p->pMapping != NULL );
if ( Gia_ManLutSizeMax( p ) > 4 )
{
printf( "Resynthesis is not performed when nodes have more than 4 inputs.\n" );
return NULL;
}
pLutClass = ABC_CALLOC( int, Gia_ManObjNum(p) );
vLeaves = Vec_IntAlloc( 0 );
vTruth = Vec_IntAlloc( (1<<16) );
vVisited = Vec_IntAlloc( 0 );
vLeavesBest = Vec_IntAlloc( 4 );
// prepare the library
Dar_LibPrepare( 5 );
// clean the old manager
Gia_ManCleanTruth( p );
Gia_ManSetPhase( p );
Gia_ManFillValue( p );
Gia_ManConst0(p)->Value = 0;
// start the new manager
pNew = Gia_ManStart( Gia_ManObjNum(p) );
pNew->pName = Abc_UtilStrsav( p->pName );
pNew->pSpec = Abc_UtilStrsav( p->pSpec );
Gia_ManHashAlloc( pNew );
Gia_ManCleanLevels( pNew, Gia_ManObjNum(p) );
Gia_ManForEachObj1( p, pObj, i )
{
if ( Gia_ObjIsCi(pObj) )
{
pObj->Value = Gia_ManAppendCi( pNew );
if ( p->vLevels )
Gia_ObjSetLevel( pNew, Gia_ObjFromLit(pNew, Gia_ObjValue(pObj)), Gia_ObjLevel(p, pObj) );
}
else if ( Gia_ObjIsCo(pObj) )
{
pObj->Value = Gia_ManAppendCo( pNew, Gia_ObjFanin0Copy(pObj) );
}
else if ( Gia_ObjIsLut(p, i) )
{
Counter++;
// collect leaves of this gate
Vec_IntClear( vLeaves );
Gia_LutForEachFanin( p, i, iFan, k )
Vec_IntPush( vLeaves, iFan );
for ( ; k < 4; k++ )
Vec_IntPush( vLeaves, 0 );
//.compute the truth table
pTruth = Gia_ManConvertAigToTruth( p, pObj, vLeaves, vTruth, vVisited );
// change from node IDs to their literals
Gia_ManForEachObjVec( vLeaves, p, pFanin, k )
{
assert( Gia_ObjValue(pFanin) != ~0 );
Vec_IntWriteEntry( vLeaves, k, Gia_ObjValue(pFanin) );
}
// derive new structre
if ( Gia_ManTruthIsConst0(pTruth, Vec_IntSize(vLeaves)) )
pObj->Value = 0;
else if ( Gia_ManTruthIsConst1(pTruth, Vec_IntSize(vLeaves)) )
pObj->Value = 1;
else
{
pObj->Value = Dar_LibEvalBuild( pNew, vLeaves, 0xffff & *pTruth, fKeepLevel, vLeavesBest );
pObj->Value = Abc_LitNotCond( pObj->Value, Gia_ObjPhaseRealLit(pNew, pObj->Value) ^ pObj->fPhase );
}
}
}
