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/**CFile****************************************************************
FileName [aigNewAig.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Strashing of the current network.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: aigNewAig.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
#include "extra.h"
#include "dec.h"
#include "aig.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static Abc_Ntk_t * Abc_NtkFromAig( Abc_Ntk_t * pNtkOld, Aig_Man_t * pMan );
static Aig_Man_t * Abc_NtkToAig( Abc_Ntk_t * pNtkOld );
static void Abc_NtkStrashPerformAig( Abc_Ntk_t * pNtk, Aig_Man_t * pMan );
static Aig_Node_t * Abc_NodeStrashAig( Aig_Man_t * pMan, Abc_Obj_t * pNode );
static Aig_Node_t * Abc_NodeStrashAigSopAig( Aig_Man_t * pMan, Abc_Obj_t * pNode, char * pSop );
static Aig_Node_t * Abc_NodeStrashAigExorAig( Aig_Man_t * pMan, Abc_Obj_t * pNode, char * pSop );
static Aig_Node_t * Abc_NodeStrashAigFactorAig( Aig_Man_t * pMan, Abc_Obj_t * pNode, char * pSop );
extern char * Mio_GateReadSop( void * pGate );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Gives the current ABC network to AIG manager for processing.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkNewAig( Abc_Ntk_t * pNtk )
{
Aig_Man_t * pMan;
Abc_Ntk_t * pNtkAig;
// Aig_ProofType_t RetValue;
int fCleanup = 1;
int nNodes;
extern void Aig_MffcTest( Aig_Man_t * pMan );
assert( !Abc_NtkIsNetlist(pNtk) );
assert( !Abc_NtkIsSeq(pNtk) );
if ( Abc_NtkIsBddLogic(pNtk) )
{
if ( !Abc_NtkBddToSop(pNtk, 0) )
{
printf( "Converting to SOPs has failed.\n" );
return;
}
}
// print warning about choice nodes
if ( Abc_NtkGetChoiceNum( pNtk ) )
printf( "Warning: The choice nodes in the initial AIG are removed by strashing.\n" );
// convert to the AIG manager
pMan = Abc_NtkToAig( pNtk );
Aig_MffcTest( pMan );
/*
// execute a command in the AIG manager
RetValue = Aig_FraigProve( pMan );
if ( RetValue == AIG_PROOF_SAT )
printf( "Satisfiable.\n" );
else if ( RetValue == AIG_PROOF_UNSAT )
printf( "Unsatisfiable.\n" );
else if ( RetValue == AIG_PROOF_TIMEOUT )
printf( "Undecided.\n" );
else
assert( 0 );
*/
// convert from the AIG manager
pNtkAig = Abc_NtkFromAig( pNtk, pMan );
Aig_ManStop( pMan );
// report the cleanup results
if ( fCleanup && (nNodes = Abc_AigCleanup(pNtkAig->pManFunc)) )
printf( "Warning: AIG cleanup removed %d nodes (this is not a bug).\n", nNodes );
// duplicate EXDC
if ( pNtk->pExdc )
pNtkAig->pExdc = Abc_NtkDup( pNtk->pExdc );
// make sure everything is okay
if ( !Abc_NtkCheck( pNtkAig ) )
{
printf( "Abc_NtkStrash: The network check has failed.\n" );
Abc_NtkDelete( pNtkAig );
return NULL;
}
return pNtkAig;
}
/**Function*************************************************************
Synopsis [Converts the network from the AIG manager into ABC.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkFromAig( Abc_Ntk_t * pNtkOld, Aig_Man_t * pMan )
{
Abc_Ntk_t * pNtk;
Abc_Obj_t * pObj, * pObjNew, * pFaninNew, * pFaninNew0, * pFaninNew1;
Aig_Node_t * pAnd;
int i;
// perform strashing
pNtk = Abc_NtkStartFrom( pNtkOld, ABC_NTK_STRASH, ABC_FUNC_AIG );
// transfer the pointers to the basic nodes
Aig_ManConst1(pMan)->Data = Abc_NtkConst1(pNtk)->Id;
Abc_NtkForEachCi( pNtkOld, pObj, i )
Aig_ManPi(pMan, i)->Data = pObj->pCopy->Id;
// rebuild the AIG
Aig_ManForEachAnd( pMan, pAnd, i )
{
// add the first fanins
pFaninNew0 = Abc_NtkObj( pNtk, Aig_NodeFanin0(pAnd)->Data );
pFaninNew0 = Abc_ObjNotCond( pFaninNew0, Aig_NodeFaninC0(pAnd) );
// add the first second
pFaninNew1 = Abc_NtkObj( pNtk, Aig_NodeFanin1(pAnd)->Data );
pFaninNew1 = Abc_ObjNotCond( pFaninNew1, Aig_NodeFaninC1(pAnd) );
// create the new node
pObjNew = Abc_AigAnd( pNtk->pManFunc, pFaninNew0, pFaninNew1 );
pAnd->Data = pObjNew->Id;
}
// connect the PO nodes
Abc_NtkForEachCo( pNtkOld, pObj, i )
{
pAnd = Aig_ManPo( pMan, i );
pFaninNew = Abc_NtkObj( pNtk, Aig_NodeFanin0(pAnd)->Data );
pFaninNew = Abc_ObjNotCond( pFaninNew, Aig_NodeFaninC0(pAnd) );
Abc_ObjAddFanin( pObj->pCopy, pFaninNew );
}
return pNtk;
}
/**Function*************************************************************
Synopsis [Converts the network from the AIG manager into ABC.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Abc_NtkToAig( Abc_Ntk_t * pNtkOld )
{
Aig_Param_t Params;
Aig_Man_t * pMan;
Abc_Obj_t * pObj;
Aig_Node_t * pFanin;
int i;
// create the manager
Aig_ManSetDefaultParams( &Params );
pMan = Aig_ManStart( &Params );
// create the PIs
Abc_NtkConst1(pNtkOld)->pCopy = (Abc_Obj_t *)Aig_ManConst1(pMan);
Abc_NtkForEachCi( pNtkOld, pObj, i )
pObj->pCopy = (Abc_Obj_t *)Aig_NodeCreatePi(pMan);
Abc_NtkForEachCo( pNtkOld, pObj, i )
pObj->pCopy = (Abc_Obj_t *)Aig_NodeCreatePo(pMan);
// perform the conversion of the internal nodes
Abc_NtkStrashPerformAig( pNtkOld, pMan );
// create the POs
Abc_NtkForEachCo( pNtkOld, pObj, i )
{
pFanin = (Aig_Node_t *)Abc_ObjFanin0(pObj)->pCopy;
pFanin = Aig_NotCond( pFanin, Abc_ObjFaninC0(pObj) );
Aig_NodeConnectPo( pMan, (Aig_Node_t *)pObj->pCopy, pFanin );
}
return pMan;
}
/**Function*************************************************************
Synopsis [Prepares the network for strashing.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkStrashPerformAig( Abc_Ntk_t * pNtk, Aig_Man_t * pMan )
{
// ProgressBar * pProgress;
Vec_Ptr_t * vNodes;
Abc_Obj_t * pNode;
int i;
vNodes = Abc_NtkDfs( pNtk, 0 );
// pProgress = Extra_ProgressBarStart( stdout, vNodes->nSize );
Vec_PtrForEachEntry( vNodes, pNode, i )
{
// Extra_ProgressBarUpdate( pProgress, i, NULL );
pNode->pCopy = (Abc_Obj_t *)Abc_NodeStrashAig( pMan, pNode );
}
// Extra_ProgressBarStop( pProgress );
Vec_PtrFree( vNodes );
}
/**Function*************************************************************
Synopsis [Strashes one logic node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Node_t * Abc_NodeStrashAig( Aig_Man_t * pMan, Abc_Obj_t * pNode )
{
int fUseFactor = 1;
char * pSop;
Aig_Node_t * pFanin0, * pFanin1;
extern int Abc_SopIsExorType( char * pSop );
assert( Abc_ObjIsNode(pNode) );
// consider the case when the graph is an AIG
if ( Abc_NtkIsStrash(pNode->pNtk) )
{
if ( Abc_NodeIsConst(pNode) )
return Aig_ManConst1(pMan);
pFanin0 = (Aig_Node_t *)Abc_ObjFanin0(pNode)->pCopy;
pFanin0 = Aig_NotCond( pFanin0, Abc_ObjFaninC0(pNode) );
pFanin1 = (Aig_Node_t *)Abc_ObjFanin1(pNode)->pCopy;
pFanin1 = Aig_NotCond( pFanin1, Abc_ObjFaninC1(pNode) );
return Aig_And( pMan, pFanin0, pFanin1 );
}
// get the SOP of the node
if ( Abc_NtkHasMapping(pNode->pNtk) )
pSop = Mio_GateReadSop(pNode->pData);
else
pSop = pNode->pData;
// consider the constant node
if ( Abc_NodeIsConst(pNode) )
return Aig_NotCond( Aig_ManConst1(pMan), Abc_SopIsConst0(pSop) );
// consider the special case of EXOR function
if ( Abc_SopIsExorType(pSop) )
return Abc_NodeStrashAigExorAig( pMan, pNode, pSop );
// decide when to use factoring
if ( fUseFactor && Abc_ObjFaninNum(pNode) > 2 && Abc_SopGetCubeNum(pSop) > 1 )
return Abc_NodeStrashAigFactorAig( pMan, pNode, pSop );
return Abc_NodeStrashAigSopAig( pMan, pNode, pSop );
}
/**Function*************************************************************
Synopsis [Strashes one logic node using its SOP.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Node_t * Abc_NodeStrashAigSopAig( Aig_Man_t * pMan, Abc_Obj_t * pNode, char * pSop )
{
Abc_Obj_t * pFanin;
Aig_Node_t * pAnd, * pSum;
char * pCube;
int i, nFanins;
// get the number of node's fanins
nFanins = Abc_ObjFaninNum( pNode );
assert( nFanins == Abc_SopGetVarNum(pSop) );
// go through the cubes of the node's SOP
pSum = Aig_Not( Aig_ManConst1(pMan) );
Abc_SopForEachCube( pSop, nFanins, pCube )
{
// create the AND of literals
pAnd = Aig_ManConst1(pMan);
Abc_ObjForEachFanin( pNode, pFanin, i ) // pFanin can be a net
{
if ( pCube[i] == '1' )
pAnd = Aig_And( pMan, pAnd, (Aig_Node_t *)pFanin->pCopy );
else if ( pCube[i] == '0' )
pAnd = Aig_And( pMan, pAnd, Aig_Not((Aig_Node_t *)pFanin->pCopy) );
}
// add to the sum of cubes
pSum = Aig_Or( pMan, pSum, pAnd );
}
// decide whether to complement the result
if ( Abc_SopIsComplement(pSop) )
pSum = Aig_Not(pSum);
return pSum;
}
/**Function*************************************************************
Synopsis [Strashed n-input XOR function.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Node_t * Abc_NodeStrashAigExorAig( Aig_Man_t * pMan, Abc_Obj_t * pNode, char * pSop )
{
Abc_Obj_t * pFanin;
Aig_Node_t * pSum;
int i, nFanins;
// get the number of node's fanins
nFanins = Abc_ObjFaninNum( pNode );
assert( nFanins == Abc_SopGetVarNum(pSop) );
// go through the cubes of the node's SOP
pSum = Aig_Not( Aig_ManConst1(pMan) );
for ( i = 0; i < nFanins; i++ )
{
pFanin = Abc_ObjFanin( pNode, i );
pSum = Aig_Xor( pMan, pSum, (Aig_Node_t *)pFanin->pCopy );
}
if ( Abc_SopIsComplement(pSop) )
pSum = Aig_Not(pSum);
return pSum;
}
/**Function*************************************************************
Synopsis [Strashes one logic node using its SOP.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Node_t * Abc_NodeStrashAigFactorAig( Aig_Man_t * pMan, Abc_Obj_t * pRoot, char * pSop )
{
Dec_Graph_t * pFForm;
Dec_Node_t * pNode;
Aig_Node_t * pAnd;
int i;
extern Aig_Node_t * Dec_GraphToNetworkAig( Aig_Man_t * pMan, Dec_Graph_t * pGraph );
// perform factoring
pFForm = Dec_Factor( pSop );
// collect the fanins
Dec_GraphForEachLeaf( pFForm, pNode, i )
pNode->pFunc = Abc_ObjFanin(pRoot,i)->pCopy;
// perform strashing
pAnd = Dec_GraphToNetworkAig( pMan, pFForm );
Dec_GraphFree( pFForm );
return pAnd;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
