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/**CFile****************************************************************
FileName [abcCut.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Interface to cut computation.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcCut.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
#include "cut.h"
#include "seqInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Abc_NtkPrintCuts( void * p, Abc_Ntk_t * pNtk, int fSeq );
static void Abc_NtkPrintCuts_( void * p, Abc_Ntk_t * pNtk, int fSeq );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Man_t * Abc_NtkCuts( Abc_Ntk_t * pNtk, Cut_Params_t * pParams )
{
Cut_Man_t * p;
Abc_Obj_t * pObj, * pNode;
Vec_Ptr_t * vNodes;
Vec_Int_t * vChoices;
int i;
int clk = clock();
extern void Abc_NtkBalanceAttach( Abc_Ntk_t * pNtk );
extern void Abc_NtkBalanceDetach( Abc_Ntk_t * pNtk );
assert( Abc_NtkIsStrash(pNtk) );
/*
if ( pParams->fMulti )
{
Abc_Obj_t * pNode, * pNodeA, * pNodeB, * pNodeC;
int nFactors;
// lebel the nodes, which will be the roots of factor-cuts
// mark the multiple-fanout nodes
Abc_AigForEachAnd( pNtk, pNode, i )
if ( pNode->vFanouts.nSize > 1 )
pNode->fMarkB = 1;
// unmark the control inputs of MUXes and inputs of EXOR gates
Abc_AigForEachAnd( pNtk, pNode, i )
{
if ( !Abc_NodeIsMuxType(pNode) )
continue;
pNodeC = Abc_NodeRecognizeMux( pNode, &pNodeA, &pNodeB );
// if real children are used, skip
if ( Abc_ObjFanin0(pNode)->vFanouts.nSize > 1 || Abc_ObjFanin1(pNode)->vFanouts.nSize > 1 )
continue;
if ( pNodeC->vFanouts.nSize == 2 )
pNodeC->fMarkB = 0;
if ( Abc_ObjRegular(pNodeA) == Abc_ObjRegular(pNodeB) && Abc_ObjRegular(pNodeA)->vFanouts.nSize == 2 )
Abc_ObjRegular(pNodeA)->fMarkB = 0;
}
// mark the PO drivers
// Abc_NtkForEachCo( pNtk, pNode, i )
// Abc_ObjFanin0(pNode)->fMarkB = 1;
nFactors = 0;
Abc_AigForEachAnd( pNtk, pNode, i )
nFactors += pNode->fMarkB;
printf( "Total nodes = %6d. Total factors = %6d.\n", Abc_NtkNodeNum(pNtk), nFactors );
}
*/
// start the manager
pParams->nIdsMax = Abc_NtkObjNumMax( pNtk );
p = Cut_ManStart( pParams );
if ( pParams->fDrop )
Cut_ManSetFanoutCounts( p, Abc_NtkFanoutCounts(pNtk) );
// set cuts for PIs
Abc_NtkForEachCi( pNtk, pObj, i )
if ( Abc_ObjFanoutNum(pObj) > 0 )
Cut_NodeSetTriv( p, pObj->Id );
// compute cuts for internal nodes
vNodes = Abc_AigDfs( pNtk, 0, 1 ); // collects POs
vChoices = Vec_IntAlloc( 100 );
Vec_PtrForEachEntry( vNodes, pObj, i )
{
// when we reached a CO, it is time to deallocate the cuts
if ( Abc_ObjIsCo(pObj) )
{
if ( pParams->fDrop )
Cut_NodeTryDroppingCuts( p, Abc_ObjFaninId0(pObj) );
continue;
}
// skip constant node, it has no cuts
if ( Abc_NodeIsConst(pObj) )
continue;
// compute the cuts to the internal node
Abc_NodeGetCuts( p, pObj, pParams->fMulti );
// consider dropping the fanins cuts
if ( pParams->fDrop )
{
Cut_NodeTryDroppingCuts( p, Abc_ObjFaninId0(pObj) );
Cut_NodeTryDroppingCuts( p, Abc_ObjFaninId1(pObj) );
}
// add cuts due to choices
if ( Abc_NodeIsAigChoice(pObj) )
{
Vec_IntClear( vChoices );
for ( pNode = pObj; pNode; pNode = pNode->pData )
Vec_IntPush( vChoices, pNode->Id );
Cut_NodeUnionCuts( p, vChoices );
}
}
Vec_PtrFree( vNodes );
Vec_IntFree( vChoices );
/*
if ( pParams->fMulti )
{
Abc_NtkForEachObj( pNtk, pNode, i )
pNode->fMarkB = 0;
}
*/
PRT( "Total", clock() - clk );
//Abc_NtkPrintCuts_( p, pNtk, 0 );
// Cut_ManPrintStatsToFile( p, pNtk->pSpec, clock() - clk );
return p;
}
/**Function*************************************************************
Synopsis [Cut computation using the oracle.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkCutsOracle( Abc_Ntk_t * pNtk, Cut_Oracle_t * p )
{
Abc_Obj_t * pObj;
Vec_Ptr_t * vNodes;
int i, clk = clock();
int fDrop = Cut_OracleReadDrop(p);
assert( Abc_NtkIsStrash(pNtk) );
// prepare cut droppping
if ( fDrop )
Cut_OracleSetFanoutCounts( p, Abc_NtkFanoutCounts(pNtk) );
// set cuts for PIs
Abc_NtkForEachCi( pNtk, pObj, i )
if ( Abc_ObjFanoutNum(pObj) > 0 )
Cut_OracleNodeSetTriv( p, pObj->Id );
// compute cuts for internal nodes
vNodes = Abc_AigDfs( pNtk, 0, 1 ); // collects POs
Vec_PtrForEachEntry( vNodes, pObj, i )
{
// when we reached a CO, it is time to deallocate the cuts
if ( Abc_ObjIsCo(pObj) )
{
if ( fDrop )
Cut_OracleTryDroppingCuts( p, Abc_ObjFaninId0(pObj) );
continue;
}
// skip constant node, it has no cuts
if ( Abc_NodeIsConst(pObj) )
continue;
// compute the cuts to the internal node
Cut_OracleComputeCuts( p, pObj->Id, Abc_ObjFaninId0(pObj), Abc_ObjFaninId1(pObj),
Abc_ObjFaninC0(pObj), Abc_ObjFaninC1(pObj) );
// consider dropping the fanins cuts
if ( fDrop )
{
Cut_OracleTryDroppingCuts( p, Abc_ObjFaninId0(pObj) );
Cut_OracleTryDroppingCuts( p, Abc_ObjFaninId1(pObj) );
}
}
Vec_PtrFree( vNodes );
//PRT( "Total", clock() - clk );
//Abc_NtkPrintCuts_( p, pNtk, 0 );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cut_Man_t * Abc_NtkSeqCuts( Abc_Ntk_t * pNtk, Cut_Params_t * pParams )
{
Cut_Man_t * p;
Abc_Obj_t * pObj, * pNode;
int i, nIters, fStatus;
Vec_Int_t * vChoices;
int clk = clock();
assert( Abc_NtkIsSeq(pNtk) );
assert( pParams->fSeq );
// assert( Abc_NtkIsDfsOrdered(pNtk) );
// start the manager
pParams->nIdsMax = Abc_NtkObjNumMax( pNtk );
pParams->nCutSet = Abc_NtkCutSetNodeNum( pNtk );
p = Cut_ManStart( pParams );
// set cuts for the constant node and the PIs
pObj = Abc_NtkConst1(pNtk);
if ( Abc_ObjFanoutNum(pObj) > 0 )
Cut_NodeSetTriv( p, pObj->Id );
Abc_NtkForEachPi( pNtk, pObj, i )
{
//printf( "Setting trivial cut %d.\n", pObj->Id );
Cut_NodeSetTriv( p, pObj->Id );
}
// label the cutset nodes and set their number in the array
// assign the elementary cuts to the cutset nodes
Abc_SeqForEachCutsetNode( pNtk, pObj, i )
{
assert( pObj->fMarkC == 0 );
pObj->fMarkC = 1;
pObj->pCopy = (Abc_Obj_t *)i;
Cut_NodeSetTriv( p, pObj->Id );
//printf( "Setting trivial cut %d.\n", pObj->Id );
}
// process the nodes
vChoices = Vec_IntAlloc( 100 );
for ( nIters = 0; nIters < 10; nIters++ )
{
//printf( "ITERATION %d:\n", nIters );
// compute the cuts for the internal nodes
Abc_AigForEachAnd( pNtk, pObj, i )
{
Abc_NodeGetCutsSeq( p, pObj, nIters==0 );
// add cuts due to choices
if ( Abc_NodeIsAigChoice(pObj) )
{
Vec_IntClear( vChoices );
for ( pNode = pObj; pNode; pNode = pNode->pData )
Vec_IntPush( vChoices, pNode->Id );
Cut_NodeUnionCutsSeq( p, vChoices, (pObj->fMarkC ? (int)pObj->pCopy : -1), nIters==0 );
}
}
// merge the new cuts with the old cuts
Abc_NtkForEachPi( pNtk, pObj, i )
Cut_NodeNewMergeWithOld( p, pObj->Id );
Abc_AigForEachAnd( pNtk, pObj, i )
Cut_NodeNewMergeWithOld( p, pObj->Id );
// for the cutset, transfer temp cuts to new cuts
fStatus = 0;
Abc_SeqForEachCutsetNode( pNtk, pObj, i )
fStatus |= Cut_NodeTempTransferToNew( p, pObj->Id, i );
if ( fStatus == 0 )
break;
}
Vec_IntFree( vChoices );
// if the status is not finished, transfer new to old for the cutset
Abc_SeqForEachCutsetNode( pNtk, pObj, i )
Cut_NodeNewMergeWithOld( p, pObj->Id );
// transfer the old cuts to the new positions
Abc_NtkForEachObj( pNtk, pObj, i )
Cut_NodeOldTransferToNew( p, pObj->Id );
// unlabel the cutset nodes
Abc_SeqForEachCutsetNode( pNtk, pObj, i )
pObj->fMarkC = 0;
if ( pParams->fVerbose )
{
PRT( "Total", clock() - clk );
printf( "Converged after %d iterations.\n", nIters );
}
//Abc_NtkPrintCuts( p, pNtk, 1 );
return p;
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void * Abc_NodeGetCutsRecursive( void * p, Abc_Obj_t * pObj, int fMulti )
{
void * pList;
if ( pList = Abc_NodeReadCuts( p, pObj ) )
return pList;
Abc_NodeGetCutsRecursive( p, Abc_ObjFanin0(pObj), fMulti );
Abc_NodeGetCutsRecursive( p, Abc_ObjFanin1(pObj), fMulti );
return Abc_NodeGetCuts( p, pObj, fMulti );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void * Abc_NodeGetCuts( void * p, Abc_Obj_t * pObj, int fMulti )
{
// int fTriv = (!fMulti) || pObj->fMarkB;
int fTriv = (!fMulti) || (pObj->vFanouts.nSize > 1 && !Abc_NodeIsMuxControlType(pObj));
assert( Abc_NtkIsStrash(pObj->pNtk) );
assert( Abc_ObjFaninNum(pObj) == 2 );
return Cut_NodeComputeCuts( p, pObj->Id, Abc_ObjFaninId0(pObj), Abc_ObjFaninId1(pObj),
Abc_ObjFaninC0(pObj), Abc_ObjFaninC1(pObj), fTriv );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NodeGetCutsSeq( void * p, Abc_Obj_t * pObj, int fTriv )
{
int CutSetNum;
assert( Abc_NtkIsSeq(pObj->pNtk) );
assert( Abc_ObjFaninNum(pObj) == 2 );
fTriv = pObj->fMarkC ? 0 : fTriv;
CutSetNum = pObj->fMarkC ? (int)pObj->pCopy : -1;
Cut_NodeComputeCutsSeq( p, pObj->Id, Abc_ObjFaninId0(pObj), Abc_ObjFaninId1(pObj),
Abc_ObjFaninC0(pObj), Abc_ObjFaninC1(pObj), Seq_ObjFaninL0(pObj), Seq_ObjFaninL1(pObj), fTriv, CutSetNum );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void * Abc_NodeReadCuts( void * p, Abc_Obj_t * pObj )
{
return Cut_NodeReadCutsNew( p, pObj->Id );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NodeFreeCuts( void * p, Abc_Obj_t * pObj )
{
Cut_NodeFreeCuts( p, pObj->Id );
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkPrintCuts( void * p, Abc_Ntk_t * pNtk, int fSeq )
{
Cut_Man_t * pMan = p;
Cut_Cut_t * pList;
Abc_Obj_t * pObj;
int i;
printf( "Cuts of the network:\n" );
Abc_NtkForEachObj( pNtk, pObj, i )
{
pList = Abc_NodeReadCuts( p, pObj );
printf( "Node %s:\n", Abc_ObjName(pObj) );
Cut_CutPrintList( pList, fSeq );
}
}
/**Function*************************************************************
Synopsis [Computes the cuts for the network.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkPrintCuts_( void * p, Abc_Ntk_t * pNtk, int fSeq )
{
Cut_Man_t * pMan = p;
Cut_Cut_t * pList;
Abc_Obj_t * pObj;
pObj = Abc_NtkObj( pNtk, 2 * Abc_NtkObjNum(pNtk) / 3 );
pList = Abc_NodeReadCuts( p, pObj );
printf( "Node %s:\n", Abc_ObjName(pObj) );
Cut_CutPrintList( pList, fSeq );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
