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/**CFile****************************************************************
FileName [nwkBidec.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Logic network representation.]
Synopsis [Bi-decomposition of local functions.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: nwkBidec.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "nwk.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static inline int Extra_TruthWordNum( int nVars ) { return nVars <= 5 ? 1 : (1 << (nVars - 5)); }
static inline void Extra_TruthNot( unsigned * pOut, unsigned * pIn, int nVars )
{
int w;
for ( w = Extra_TruthWordNum(nVars)-1; w >= 0; w-- )
pOut[w] = ~pIn[w];
}
static inline void Extra_TruthOr( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
{
int w;
for ( w = Extra_TruthWordNum(nVars)-1; w >= 0; w-- )
pOut[w] = pIn0[w] | pIn1[w];
}
static inline void Extra_TruthSharp( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
{
int w;
for ( w = Extra_TruthWordNum(nVars)-1; w >= 0; w-- )
pOut[w] = pIn0[w] & ~pIn1[w];
}
static inline Hop_Obj_t * Bdc_FunCopyHop( Bdc_Fun_t * pObj ) { return Hop_NotCond( (Hop_Obj_t *)Bdc_FuncCopy(Bdc_Regular(pObj)), Bdc_IsComplement(pObj) ); }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Resynthesizes nodes using bi-decomposition.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Hop_Obj_t * Nwk_NodeIfNodeResyn( Bdc_Man_t * p, Hop_Man_t * pHop, Hop_Obj_t * pRoot, int nVars, Vec_Int_t * vTruth, unsigned * puCare, float dProb )
{
unsigned * pTruth;
Bdc_Fun_t * pFunc;
int nNodes, i;
assert( nVars <= 16 );
// derive truth table
pTruth = Hop_ManConvertAigToTruth( pHop, Hop_Regular(pRoot), nVars, vTruth, 0 );
if ( Hop_IsComplement(pRoot) )
for ( i = Abc_TruthWordNum(nVars)-1; i >= 0; i-- )
pTruth[i] = ~pTruth[i];
// perform power-aware decomposition
if ( dProb >= 0.0 )
{
float Prob = (float)2.0 * dProb * (1.0 - dProb);
assert( Prob >= 0.0 && Prob <= 0.5 );
if ( Prob >= 0.4 )
{
Extra_TruthNot( puCare, puCare, nVars );
if ( dProb > 0.5 ) // more 1s than 0s
Extra_TruthOr( pTruth, pTruth, puCare, nVars );
else
Extra_TruthSharp( pTruth, pTruth, puCare, nVars );
Extra_TruthNot( puCare, puCare, nVars );
// decompose truth table
Bdc_ManDecompose( p, pTruth, NULL, nVars, NULL, 1000 );
}
else
{
// decompose truth table
Bdc_ManDecompose( p, pTruth, puCare, nVars, NULL, 1000 );
}
}
else
{
// decompose truth table
Bdc_ManDecompose( p, pTruth, puCare, nVars, NULL, 1000 );
}
// convert back into HOP
Bdc_FuncSetCopy( Bdc_ManFunc( p, 0 ), Hop_ManConst1( pHop ) );
for ( i = 0; i < nVars; i++ )
Bdc_FuncSetCopy( Bdc_ManFunc( p, i+1 ), Hop_ManPi( pHop, i ) );
nNodes = Bdc_ManNodeNum(p);
for ( i = nVars + 1; i < nNodes; i++ )
{
pFunc = Bdc_ManFunc( p, i );
Bdc_FuncSetCopy( pFunc, Hop_And( pHop, Bdc_FunCopyHop(Bdc_FuncFanin0(pFunc)), Bdc_FunCopyHop(Bdc_FuncFanin1(pFunc)) ) );
}
return Bdc_FunCopyHop( Bdc_ManRoot(p) );
}
/**Function*************************************************************
Synopsis [Resynthesizes nodes using bi-decomposition.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Nwk_ManBidecResyn( Nwk_Man_t * pNtk, int fVerbose )
{
Bdc_Par_t Pars = {0}, * pPars = &Pars;
Bdc_Man_t * p;
Nwk_Obj_t * pObj;
Vec_Int_t * vTruth;
int i, nGainTotal = 0, nNodes1, nNodes2;
clock_t clk = clock();
pPars->nVarsMax = Nwk_ManGetFaninMax( pNtk );
pPars->fVerbose = fVerbose;
if ( pPars->nVarsMax < 2 )
{
printf( "Resynthesis is not performed for networks whose nodes are less than 2 inputs.\n" );
return;
}
if ( pPars->nVarsMax > 15 )
{
if ( fVerbose )
printf( "Resynthesis is not performed for nodes with more than 15 inputs.\n" );
pPars->nVarsMax = 15;
}
vTruth = Vec_IntAlloc( 0 );
p = Bdc_ManAlloc( pPars );
Nwk_ManForEachNode( pNtk, pObj, i )
{
if ( Nwk_ObjFaninNum(pObj) > 15 )
continue;
nNodes1 = Hop_DagSize(pObj->pFunc);
pObj->pFunc = Nwk_NodeIfNodeResyn( p, pNtk->pManHop, pObj->pFunc, Nwk_ObjFaninNum(pObj), vTruth, NULL, -1.0 );
nNodes2 = Hop_DagSize(pObj->pFunc);
nGainTotal += nNodes1 - nNodes2;
}
Bdc_ManFree( p );
Vec_IntFree( vTruth );
if ( fVerbose )
{
printf( "Total gain in AIG nodes = %d. ", nGainTotal );
ABC_PRT( "Total runtime", clock() - clk );
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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