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abc/src/base/abci/abcMfs.c

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/**CFile****************************************************************
FileName [abcMfs.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Optimization with don't-cares.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcMfs.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "base/abc/abc.h"
#include "bool/kit/kit.h"
#include "opt/sfm/sfm.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Unrolls logic network while dropping some next-state functions.]
Description [Returns the unrolled network.]
SideEffects []
SeeAlso []
***********************************************************************/
Abc_Ntk_t * Abc_NtkUnrollAndDrop( Abc_Ntk_t * p, int nFrames, Vec_Int_t * vFlops, int * piPivot )
{
Abc_Ntk_t * pNew;
Abc_Obj_t * pFanin, * pNode;
Vec_Ptr_t * vNodes;
int i, k, f, iObj;
assert( Abc_NtkIsLogic(pNtk) );
assert( Vec_IntSize(vFlops) <= Abc_NtkLatchNum(p) );
*piPivot = -1;
// start the network
pNew = Abc_NtkAlloc( p->ntkType, p->ntkFunc, 1 );
pNew->pName = Extra_UtilStrsav(Abc_NtkName(p));
// add the PIs corresponding to flop outputs
Abc_NtkForEachLatchOutput( p, pNode, i )
Abc_ObjFanout0(pNode)->pCopy = Abc_NtkCreatePi( pNew );
// iterate unrolling
vNodes = Abc_NtkDfs( p, 0 );
for ( f = 0; f < nFrames; f++ )
{
Abc_NtkForEachPi( p, pNode, i )
pNode->pCopy = Abc_NtkCreatePi( pNew );
Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pNode, i )
{
Abc_NtkDupObj( pNew, pNode, 0 );
Abc_ObjForEachFanin( pNode, pFanin, k )
Abc_ObjAddFanin( pNode->pCopy, pFanin->pCopy );
}
Abc_NtkForEachPo( p, pNode, i )
Abc_ObjAddFanin( Abc_NtkCreatePo(pNew), Abc_ObjFanin0(pNode)->pCopy );
// transfer to outputs
Abc_NtkForEachLatch( p, pNode, i )
Abc_ObjFanout0(pNode)->pCopy = Abc_ObjFanin0(pNode)->pCopy;
if ( f == 0 )
*piPivot = Abc_NtkObjNum(pNew);
}
Vec_PtrFree( vNodes );
// add final POs
Vec_IntForEachEntry( vFlops, iObj, i )
{
assert( iObj >= 0 && iObj < Abc_NtkLatchNum(p) );
pNode = Abc_NtkCo( p, Abc_NtkPiNum(p) + iObj );
Abc_ObjAddFanin( Abc_NtkCreatePo(pNew), Abc_ObjFanin0(pNode)->pCopy );
}
Abc_NtkAddDummyPiNames( pNew );
Abc_NtkAddDummyPoNames( pNew );
// perform combinational cleanup
Abc_NtkCleanup( pNew, 0 );
if ( !Abc_NtkCheck( pNew ) )
fprintf( stdout, "Abc_NtkCreateFromNode(): Network check has failed.\n" );
return pNew;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Abc_NtkAssignIDs( Abc_Ntk_t * pNtk )
{
Vec_Ptr_t * vNodes;
Abc_Obj_t * pObj;
int i;
vNodes = Abc_NtkDfs( pNtk, 0 );
Abc_NtkCleanCopy( pNtk );
Abc_NtkForEachCi( pNtk, pObj, i )
pObj->iTemp = i;
Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
{
pObj->iTemp = Abc_NtkCiNum(pNtk) + i;
//printf( "%d->%d ", pObj->Id, pObj->iTemp );
}
//printf( "\n" );
Abc_NtkForEachCo( pNtk, pObj, i )
pObj->iTemp = Abc_NtkCiNum(pNtk) + Vec_PtrSize(vNodes) + i;
return vNodes;
}
Vec_Ptr_t * Abc_NtkAssignIDs2( Abc_Ntk_t * pNtk )
{
Vec_Ptr_t * vNodes;
Abc_Obj_t * pObj;
int i;
Abc_NtkCleanCopy( pNtk );
Abc_NtkForEachCi( pNtk, pObj, i )
pObj->iTemp = i;
vNodes = Vec_PtrAlloc( Abc_NtkNodeNum(pNtk) );
Abc_NtkForEachNode( pNtk, pObj, i )
{
pObj->iTemp = Abc_NtkCiNum(pNtk) + Vec_PtrSize(vNodes);
Vec_PtrPush( vNodes, pObj );
}
assert( Vec_PtrSize(vNodes) == Abc_NtkNodeNum(pNtk) );
Abc_NtkForEachCo( pNtk, pObj, i )
pObj->iTemp = Abc_NtkCiNum(pNtk) + Vec_PtrSize(vNodes) + i;
return vNodes;
}
/**Function*************************************************************
Synopsis [Extracts information about the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Sfm_Ntk_t * Abc_NtkExtractMfs( Abc_Ntk_t * pNtk, int nFirstFixed )
{
Vec_Ptr_t * vNodes;
Vec_Wec_t * vFanins;
Vec_Str_t * vFixed;
Vec_Wrd_t * vTruths;
Vec_Int_t * vArray;
Abc_Obj_t * pObj, * pFanin;
int i, k, nObjs;
vNodes = nFirstFixed ? Abc_NtkAssignIDs2(pNtk) : Abc_NtkAssignIDs(pNtk);
nObjs = Abc_NtkCiNum(pNtk) + Vec_PtrSize(vNodes) + Abc_NtkCoNum(pNtk);
vFanins = Vec_WecStart( nObjs );
vFixed = Vec_StrStart( nObjs );
vTruths = Vec_WrdStart( nObjs );
Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
{
word uTruth = Abc_SopToTruth((char *)pObj->pData, Abc_ObjFaninNum(pObj));
Vec_WrdWriteEntry( vTruths, pObj->iTemp, uTruth );
if ( uTruth == 0 || ~uTruth == 0 )
continue;
vArray = Vec_WecEntry( vFanins, pObj->iTemp );
Vec_IntGrow( vArray, Abc_ObjFaninNum(pObj) );
Abc_ObjForEachFanin( pObj, pFanin, k )
Vec_IntPush( vArray, pFanin->iTemp );
}
Abc_NtkForEachCo( pNtk, pObj, i )
{
vArray = Vec_WecEntry( vFanins, pObj->iTemp );
Vec_IntGrow( vArray, Abc_ObjFaninNum(pObj) );
Abc_ObjForEachFanin( pObj, pFanin, k )
Vec_IntPush( vArray, pFanin->iTemp );
}
Vec_PtrFree( vNodes );
for ( i = Abc_NtkCiNum(pNtk); i < Abc_NtkCiNum(pNtk) + nFirstFixed; i++ )
Vec_StrWriteEntry( vFixed, i, (char)1 );
// update fixed
assert( nFirstFixed >= 0 && nFirstFixed < Abc_NtkNodeNum(pNtk) );
// for ( i = Abc_NtkCiNum(pNtk); i + Abc_NtkCoNum(pNtk) < Abc_NtkObjNum(pNtk); i++ )
// if ( rand() % 10 == 0 )
// Vec_StrWriteEntry( vFixed, i, (char)1 );
return Sfm_NtkConstruct( vFanins, Abc_NtkCiNum(pNtk), Abc_NtkCoNum(pNtk), vFixed, NULL, vTruths );
}
Sfm_Ntk_t * Abc_NtkExtractMfs2( Abc_Ntk_t * pNtk, int iPivot )
{
Vec_Ptr_t * vNodes;
Vec_Wec_t * vFanins;
Vec_Str_t * vFixed;
Vec_Wrd_t * vTruths;
Vec_Int_t * vArray;
Abc_Obj_t * pObj, * pFanin;
int i, k, nObjs;
vNodes = Abc_NtkAssignIDs2(pNtk);
nObjs = Abc_NtkCiNum(pNtk) + Vec_PtrSize(vNodes) + Abc_NtkCoNum(pNtk);
vFanins = Vec_WecStart( nObjs );
vFixed = Vec_StrStart( nObjs );
vTruths = Vec_WrdStart( nObjs );
Vec_PtrForEachEntry( Abc_Obj_t *, vNodes, pObj, i )
{
word uTruth = Abc_SopToTruth((char *)pObj->pData, Abc_ObjFaninNum(pObj));
Vec_WrdWriteEntry( vTruths, pObj->iTemp, uTruth );
if ( uTruth == 0 || ~uTruth == 0 )
continue;
vArray = Vec_WecEntry( vFanins, pObj->iTemp );
Vec_IntGrow( vArray, Abc_ObjFaninNum(pObj) );
Abc_ObjForEachFanin( pObj, pFanin, k )
Vec_IntPush( vArray, pFanin->iTemp );
}
Abc_NtkForEachCo( pNtk, pObj, i )
{
vArray = Vec_WecEntry( vFanins, pObj->iTemp );
Vec_IntGrow( vArray, Abc_ObjFaninNum(pObj) );
Abc_ObjForEachFanin( pObj, pFanin, k )
Vec_IntPush( vArray, pFanin->iTemp );
}
Vec_PtrFree( vNodes );
// set fixed attributes
Abc_NtkForEachNode( pNtk, pObj, i )
if ( i >= iPivot )
Vec_StrWriteEntry( vFixed, i, (char)1 );
return Sfm_NtkConstruct( vFanins, Abc_NtkCiNum(pNtk), Abc_NtkCoNum(pNtk), vFixed, NULL, vTruths );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkInsertMfs( Abc_Ntk_t * pNtk, Sfm_Ntk_t * p )
{
Vec_Int_t * vCover, * vMap, * vArray;
Abc_Obj_t * pNode;
word * pTruth;
int i, k, Fanin;
// map new IDs into old nodes
vMap = Vec_IntStart( Abc_NtkObjNumMax(pNtk) );
Abc_NtkForEachCi( pNtk, pNode, i )
Vec_IntWriteEntry( vMap, pNode->iTemp, Abc_ObjId(pNode) );
Abc_NtkForEachNode( pNtk, pNode, i )
if ( pNode->iTemp > 0 )
Vec_IntWriteEntry( vMap, pNode->iTemp, Abc_ObjId(pNode) );
// remove old fanins
Abc_NtkForEachNode( pNtk, pNode, i )
if ( !Sfm_NodeReadFixed(p, pNode->iTemp) )
Abc_ObjRemoveFanins( pNode );
// create new fanins
vCover = Vec_IntAlloc( 1 << 16 );
Abc_NtkForEachNode( pNtk, pNode, i )
{
if ( pNode->iTemp == 0 || Sfm_NodeReadFixed(p, pNode->iTemp) )
continue;
if ( !Sfm_NodeReadUsed(p, pNode->iTemp) )
{
Abc_NtkDeleteObj( pNode );
continue;
}
// update fanins
vArray = Sfm_NodeReadFanins( p, pNode->iTemp );
Vec_IntForEachEntry( vArray, Fanin, k )
Abc_ObjAddFanin( pNode, Abc_NtkObj(pNtk, Vec_IntEntry(vMap, Fanin)) );
// update function
pTruth = Sfm_NodeReadTruth( p, pNode->iTemp );
if ( pTruth[0] == 0 )
pNode->pData = Abc_SopRegister( (Mem_Flex_t *)pNtk->pManFunc, " 0\n" );
else if ( ~pTruth[0] == 0 )
pNode->pData = Abc_SopRegister( (Mem_Flex_t *)pNtk->pManFunc, " 1\n" );
else
{
int RetValue = Kit_TruthIsop( (unsigned *)pTruth, Vec_IntSize(vArray), vCover, 1 );
assert( Vec_IntSize(vArray) > 0 );
assert( RetValue == 0 || RetValue == 1 );
pNode->pData = Abc_SopCreateFromIsop( (Mem_Flex_t *)pNtk->pManFunc, Vec_IntSize(vArray), vCover );
if ( RetValue )
Abc_SopComplement( (char *)pNode->pData );
}
assert( Abc_SopGetVarNum((char *)pNode->pData) == Vec_IntSize(vArray) );
}
Vec_IntFree( vCover );
Vec_IntFree( vMap );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_NtkPerformMfs( Abc_Ntk_t * pNtk, Sfm_Par_t * pPars )
{
Sfm_Ntk_t * p;
int nFaninMax, nNodes;
assert( Abc_NtkIsLogic(pNtk) );
// count fanouts
nFaninMax = Abc_NtkGetFaninMax( pNtk );
if ( nFaninMax > 6 )
{
Abc_Print( 1, "Currently \"mfs\" cannot process the network containing nodes with more than 6 fanins.\n" );
return 0;
}
if ( !Abc_NtkHasSop(pNtk) )
Abc_NtkToSop( pNtk, 0 );
// collect information
p = Abc_NtkExtractMfs( pNtk, pPars->nFirstFixed );
// perform optimization
nNodes = Sfm_NtkPerform( p, pPars );
// call the fast extract procedure
if ( nNodes == 0 )
{
// Abc_Print( 1, "The network is not changed by \"mfs\".\n" );
}
else
{
Abc_NtkInsertMfs( pNtk, p );
if( pPars->fVerbose )
Abc_Print( 1, "The network has %d nodes changed by \"mfs\".\n", nNodes );
}
Sfm_NtkFree( p );
return 1;
}
/**Function*************************************************************
Synopsis [Performs MFS for the unrolled network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkMfsAfterICheck( Abc_Ntk_t * p, int nFrames, Vec_Int_t * vFlops, Sfm_Par_t * pPars )
{
Sfm_Ntk_t * pp;
int nFaninMax, nNodes;
Abc_Ntk_t * pNtk;
int iPivot;
assert( Abc_NtkIsLogic(p) );
// count fanouts
nFaninMax = Abc_NtkGetFaninMax( p );
if ( nFaninMax > 6 )
{
Abc_Print( 1, "Currently \"mfs\" cannot process the network containing nodes with more than 6 fanins.\n" );
return;
}
// derive unfolded network
pNtk = Abc_NtkUnrollAndDrop( p, nFrames, vFlops, &iPivot );
if ( !Abc_NtkHasSop(pNtk) )
Abc_NtkToSop( pNtk, 0 );
// collect information
pp = Abc_NtkExtractMfs2( pNtk, iPivot );
// perform optimization
nNodes = Sfm_NtkPerform( pp, pPars );
// call the fast extract procedure
if ( nNodes == 0 )
{
// Abc_Print( 1, "The network is not changed by \"mfs\".\n" );
}
else
{
Abc_NtkInsertMfs( pNtk, pp );
if( pPars->fVerbose )
Abc_Print( 1, "The network has %d nodes changed by \"mfs\".\n", nNodes );
}
Sfm_NtkFree( pp );
return;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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