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/**CFile****************************************************************
FileName [amapGraph.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Technology mapper for standard cells.]
Synopsis [Internal AIG manager.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: amapGraph.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "amapInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Creates object.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManSetupObj( Amap_Man_t * p )
{
Amap_Obj_t * pObj;
pObj = (Amap_Obj_t *)Aig_MmFixedEntryFetch( p->pMemObj );
memset( pObj, 0, sizeof(Amap_Obj_t) );
pObj->nFouts[0] = 1; // needed for flow to work in the first pass
pObj->Id = Vec_PtrSize(p->vObjs);
Vec_PtrPush( p->vObjs, pObj );
return pObj;
}
/**Function*************************************************************
Synopsis [Creates constant 1 node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreateConst1( Amap_Man_t * p )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->Type = AMAP_OBJ_CONST1;
pObj->fPhase = 1;
p->nObjs[AMAP_OBJ_CONST1]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Creates primary input.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreatePi( Amap_Man_t * p )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->Type = AMAP_OBJ_PI;
pObj->IdPio = Vec_PtrSize( p->vPis );
Vec_PtrPush( p->vPis, pObj );
p->nObjs[AMAP_OBJ_PI]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Creates primary output with the given driver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreatePo( Amap_Man_t * p, Amap_Obj_t * pFan0 )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->IdPio = Vec_PtrSize( p->vPos );
Vec_PtrPush( p->vPos, pObj );
pObj->Type = AMAP_OBJ_PO;
pObj->Fan[0] = Amap_ObjToLit(pFan0); Amap_Regular(pFan0)->nRefs++;
pObj->Level = Amap_Regular(pFan0)->Level;
if ( p->nLevelMax < (int)pObj->Level )
p->nLevelMax = (int)pObj->Level;
assert( p->nLevelMax < 4094 ); // 2^12-2
p->nObjs[AMAP_OBJ_PO]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreateAnd( Amap_Man_t * p, Amap_Obj_t * pFan0, Amap_Obj_t * pFan1 )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->Type = AMAP_OBJ_AND;
pObj->Fan[0] = Amap_ObjToLit(pFan0); Amap_Regular(pFan0)->nRefs++;
pObj->Fan[1] = Amap_ObjToLit(pFan1); Amap_Regular(pFan1)->nRefs++;
assert( Abc_Lit2Var(pObj->Fan[0]) != Abc_Lit2Var(pObj->Fan[1]) );
pObj->fPhase = Amap_ObjPhaseReal(pFan0) & Amap_ObjPhaseReal(pFan1);
pObj->Level = 1 + Abc_MaxInt( Amap_Regular(pFan0)->Level, Amap_Regular(pFan1)->Level );
if ( p->nLevelMax < (int)pObj->Level )
p->nLevelMax = (int)pObj->Level;
assert( p->nLevelMax < 4094 ); // 2^12-2
p->nObjs[AMAP_OBJ_AND]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreateXor( Amap_Man_t * p, Amap_Obj_t * pFan0, Amap_Obj_t * pFan1 )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->Type = AMAP_OBJ_XOR;
pObj->Fan[0] = Amap_ObjToLit(pFan0); Amap_Regular(pFan0)->nRefs++;
pObj->Fan[1] = Amap_ObjToLit(pFan1); Amap_Regular(pFan1)->nRefs++;
pObj->fPhase = Amap_ObjPhaseReal(pFan0) ^ Amap_ObjPhaseReal(pFan1);
pObj->Level = 2 + Abc_MaxInt( Amap_Regular(pFan0)->Level, Amap_Regular(pFan1)->Level );
if ( p->nLevelMax < (int)pObj->Level )
p->nLevelMax = (int)pObj->Level;
assert( p->nLevelMax < 4094 ); // 2^12-2
p->nObjs[AMAP_OBJ_XOR]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManCreateMux( Amap_Man_t * p, Amap_Obj_t * pFan0, Amap_Obj_t * pFan1, Amap_Obj_t * pFanC )
{
Amap_Obj_t * pObj;
pObj = Amap_ManSetupObj( p );
pObj->Type = AMAP_OBJ_MUX;
pObj->Fan[0] = Amap_ObjToLit(pFan0); Amap_Regular(pFan0)->nRefs++;
pObj->Fan[1] = Amap_ObjToLit(pFan1); Amap_Regular(pFan1)->nRefs++;
pObj->Fan[2] = Amap_ObjToLit(pFanC); Amap_Regular(pFanC)->nRefs++;
pObj->fPhase = (Amap_ObjPhaseReal(pFan1) & Amap_ObjPhaseReal(pFanC)) |
(Amap_ObjPhaseReal(pFan0) & ~Amap_ObjPhaseReal(pFanC));
pObj->Level = Abc_MaxInt( Amap_Regular(pFan0)->Level, Amap_Regular(pFan1)->Level );
pObj->Level = 2 + Abc_MaxInt( pObj->Level, Amap_Regular(pFanC)->Level );
if ( p->nLevelMax < (int)pObj->Level )
p->nLevelMax = (int)pObj->Level;
assert( p->nLevelMax < 4094 ); // 2^12-2
p->nObjs[AMAP_OBJ_MUX]++;
return pObj;
}
/**Function*************************************************************
Synopsis [Creates the choice node.]
Description [Should be called after the equivalence class nodes are linked.]
SideEffects []
SeeAlso []
***********************************************************************/
void Amap_ManCreateChoice( Amap_Man_t * p, Amap_Obj_t * pObj )
{
Amap_Obj_t * pTemp;
// mark the node as a representative if its class
// assert( pObj->fRepr == 0 );
pObj->fRepr = 1;
// update the level of this node (needed for correct required time computation)
for ( pTemp = pObj; pTemp; pTemp = Amap_ObjChoice(p, pTemp) )
{
pObj->Level = Abc_MaxInt( pObj->Level, pTemp->Level );
// pTemp->nVisits++; pTemp->nVisitsCopy++;
}
// mark the largest level
if ( p->nLevelMax < (int)pObj->Level )
p->nLevelMax = (int)pObj->Level;
assert( p->nLevelMax < 4094 ); // 2^12-2
}
/**Function*************************************************************
Synopsis [Creates XOR/MUX choices for the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Amap_ManCreateXorChoices( Amap_Man_t * p, Amap_Obj_t * pFan0, Amap_Obj_t * pFan1, Amap_Obj_t * pChoices[] )
{
pChoices[0] = Amap_ManCreateXor( p, pFan0, pFan1 );
pChoices[1] = Amap_ManCreateXor( p, Amap_Not(pFan0), pFan1 );
pChoices[2] = Amap_ManCreateXor( p, pFan0, Amap_Not(pFan1) );
pChoices[3] = Amap_ManCreateXor( p, Amap_Not(pFan0), Amap_Not(pFan1) );
}
/**Function*************************************************************
Synopsis [Creates XOR/MUX choices for the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Amap_ManCreateMuxChoices( Amap_Man_t * p, Amap_Obj_t * pFan0, Amap_Obj_t * pFan1, Amap_Obj_t * pFanC, Amap_Obj_t * pChoices[] )
{
pChoices[0] = Amap_ManCreateMux( p, pFan0, pFan1, pFanC );
pChoices[1] = Amap_ManCreateMux( p, Amap_Not(pFan0), Amap_Not(pFan1), pFanC );
pChoices[2] = Amap_ManCreateMux( p, pFan1, pFan0, Amap_Not(pFanC) );
pChoices[3] = Amap_ManCreateMux( p, Amap_Not(pFan1), Amap_Not(pFan0), Amap_Not(pFanC) );
}
/**Function*************************************************************
Synopsis [Drags pointer out through the copy.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Amap_Obj_t * Amap_AndToObj( Aig_Obj_t * pObj )
{
return Amap_NotCond( (Amap_Obj_t *)Aig_Regular(pObj)->pData, Aig_IsComplement(pObj) );
}
/**Function*************************************************************
Synopsis [Starts the AIG manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Amap_Obj_t * Amap_ManGetLast_rec( Amap_Man_t * p, Amap_Obj_t * pObj )
{
if ( pObj->Equiv == 0 )
return pObj;
return Amap_ManGetLast_rec( p, Amap_ObjChoice(p, pObj) );
}
/**Function*************************************************************
Synopsis [Starts the AIG manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Amap_ManCreate( Amap_Man_t * p, Aig_Man_t * pAig )
{
Vec_Ptr_t * vNodes;
Amap_Obj_t * pChoices[4];
Aig_Obj_t * pObj, * pFanin, * pPrev, * pFan0, * pFan1, * pFanC;
int i, fChoices;
if ( pAig->pEquivs )
vNodes = Aig_ManDfsChoices( pAig );
else
vNodes = Aig_ManDfs( pAig, 1 );
p->pConst1 = Amap_ManCreateConst1( p );
// print warning about excessive memory usage
if ( p->pPars->fVerbose )
{
if ( 1.0 * Aig_ManObjNum(pAig) * sizeof(Amap_Obj_t) / (1<<30) > 0.1 )
printf( "Warning: Mapper allocates %.3f Gb for subject graph with %d objects.\n",
1.0 * Aig_ManObjNum(pAig) * sizeof(Amap_Obj_t) / (1<<30), Aig_ManObjNum(pAig) );
}
// create PIs and remember them in the old nodes
Aig_ManCleanData(pAig);
Aig_ManConst1(pAig)->pData = Amap_ManConst1( p );
Aig_ManForEachPi( pAig, pObj, i )
pObj->pData = Amap_ManCreatePi( p );
// load the AIG into the mapper
Vec_PtrForEachEntry( Aig_Obj_t *, vNodes, pObj, i )
{
fChoices = 0;
if ( p->fUseXor && Aig_ObjRecognizeExor(pObj, &pFan0, &pFan1 ) )
{
Amap_ManCreateXorChoices( p, Amap_AndToObj(pFan0), Amap_AndToObj(pFan1), pChoices );
fChoices = 1;
}
else if ( p->fUseMux && Aig_ObjIsMuxType(pObj) )
{
pFanC = Aig_ObjRecognizeMux( pObj, &pFan1, &pFan0 );
Amap_ManCreateMuxChoices( p, Amap_AndToObj(pFan0), Amap_AndToObj(pFan1), Amap_AndToObj(pFanC), pChoices );
fChoices = 1;
}
pObj->pData = Amap_ManCreateAnd( p, (Amap_Obj_t *)Aig_ObjChild0Copy(pObj), (Amap_Obj_t *)Aig_ObjChild1Copy(pObj) );
if ( fChoices )
{
p->nChoicesAdded++;
Amap_ObjSetChoice( (Amap_Obj_t *)pObj->pData, pChoices[0] );
Amap_ObjSetChoice( pChoices[0], pChoices[1] );
Amap_ObjSetChoice( pChoices[1], pChoices[2] );
Amap_ObjSetChoice( pChoices[2], pChoices[3] );
Amap_ManCreateChoice( p, (Amap_Obj_t *)pObj->pData );
}
if ( Aig_ObjIsChoice( pAig, pObj ) )
{
// assert( !fChoices );
p->nChoicesGiven++;
for ( pPrev = pObj, pFanin = Aig_ObjEquiv(pAig, pObj); pFanin; pPrev = pFanin, pFanin = Aig_ObjEquiv(pAig, pFanin) )
{
((Amap_Obj_t *)pFanin->pData)->fRepr = 0;
Amap_ObjSetChoice( Amap_ManGetLast_rec(p, (Amap_Obj_t *)pPrev->pData),
(Amap_Obj_t *)pFanin->pData );
}
Amap_ManCreateChoice( p, (Amap_Obj_t *)pObj->pData );
}
}
Vec_PtrFree( vNodes );
// set the primary outputs without copying the phase
Aig_ManForEachPo( pAig, pObj, i )
pObj->pData = Amap_ManCreatePo( p, (Amap_Obj_t *)Aig_ObjChild0Copy(pObj) );
if ( p->pPars->fVerbose )
printf( "Performing mapping with %d given and %d created choices.\n",
p->nChoicesGiven, p->nChoicesAdded );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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