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/**CFile****************************************************************
FileName [lpkAbcUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Fast Boolean matching for LUT structures.]
Synopsis [Procedures working on decomposed functions.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: lpkAbcUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "lpkInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Allocates the function.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Lpk_Fun_t * Lpk_FunAlloc( int nVars )
{
Lpk_Fun_t * p;
p = (Lpk_Fun_t *)malloc( sizeof(Lpk_Fun_t) + sizeof(unsigned) * Kit_TruthWordNum(nVars) * 3 );
memset( p, 0, sizeof(Lpk_Fun_t) );
return p;
}
/**Function*************************************************************
Synopsis [Deletes the function]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Lpk_FunFree( Lpk_Fun_t * p )
{
free( p );
}
/**Function*************************************************************
Synopsis [Creates the starting function.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Lpk_Fun_t * Lpk_FunCreate( Abc_Ntk_t * pNtk, Vec_Ptr_t * vLeaves, unsigned * pTruth, int nLutK, int AreaLim, int DelayLim )
{
Lpk_Fun_t * p;
Abc_Obj_t * pNode;
int i;
p = Lpk_FunAlloc( Vec_PtrSize(vLeaves) );
p->Id = Vec_PtrSize(vLeaves);
p->vNodes = vLeaves;
p->nVars = Vec_PtrSize(vLeaves);
p->nLutK = nLutK;
p->nAreaLim = AreaLim;
p->nDelayLim = DelayLim;
p->uSupp = Kit_TruthSupport( pTruth, p->nVars );
Kit_TruthCopy( Lpk_FunTruth(p,0), pTruth, p->nVars );
Vec_PtrForEachEntry( vLeaves, pNode, i )
{
p->pFanins[i] = i;
p->pDelays[i] = pNode->Level;
}
Vec_PtrPush( p->vNodes, p );
return p;
}
/**Function*************************************************************
Synopsis [Creates the new function with the given truth table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Lpk_Fun_t * Lpk_FunDup( Lpk_Fun_t * p, unsigned * pTruth )
{
Lpk_Fun_t * pNew;
pNew = Lpk_FunAlloc( p->nVars );
pNew->Id = Vec_PtrSize(p->vNodes);
pNew->vNodes = p->vNodes;
pNew->nVars = p->nVars;
pNew->nLutK = p->nLutK;
pNew->nAreaLim = p->nAreaLim;
pNew->nDelayLim = p->nDelayLim;
pNew->uSupp = Kit_TruthSupport( pTruth, p->nVars );
Kit_TruthCopy( Lpk_FunTruth(pNew,0), pTruth, p->nVars );
memcpy( pNew->pFanins, p->pFanins, 16 );
memcpy( pNew->pDelays, p->pDelays, 16 );
Vec_PtrPush( p->vNodes, pNew );
return pNew;
}
/**Function*************************************************************
Synopsis [Minimizes support of the function.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Lpk_FunSuppMinimize( Lpk_Fun_t * p )
{
int i, k, nVarsNew;
// compress the truth table
if ( p->uSupp == Kit_BitMask(p->nVars) )
return 0;
// invalidate support info
p->fSupports = 0;
//Extra_PrintBinary( stdout, &p->uSupp, p->nVars ); printf( "\n" );
// minimize support
nVarsNew = Kit_WordCountOnes(p->uSupp);
Kit_TruthShrink( Lpk_FunTruth(p, 1), Lpk_FunTruth(p, 0), nVarsNew, p->nVars, p->uSupp, 1 );
k = 0;
Lpk_SuppForEachVar( p->uSupp, i )
{
p->pFanins[k] = p->pFanins[i];
p->pDelays[k] = p->pDelays[i];
/*
if ( p->fSupports )
{
p->puSupps[2*k+0] = p->puSupps[2*i+0];
p->puSupps[2*k+1] = p->puSupps[2*i+1];
}
*/
k++;
}
assert( k == nVarsNew );
p->nVars = k;
p->uSupp = Kit_BitMask(p->nVars);
return 1;
}
/**Function*************************************************************
Synopsis [Computes cofactors w.r.t. each variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Lpk_FunComputeCofSupps( Lpk_Fun_t * p )
{
unsigned * pTruth = Lpk_FunTruth( p, 0 );
unsigned * pTruth0 = Lpk_FunTruth( p, 1 );
unsigned * pTruth1 = Lpk_FunTruth( p, 2 );
int Var;
assert( p->fSupports == 0 );
// Lpk_SuppForEachVar( p->uSupp, Var )
for ( Var = 0; Var < (int)p->nVars; Var++ )
{
Kit_TruthCofactor0New( pTruth0, pTruth, p->nVars, Var );
Kit_TruthCofactor1New( pTruth1, pTruth, p->nVars, Var );
p->puSupps[2*Var+0] = Kit_TruthSupport( pTruth0, p->nVars );
p->puSupps[2*Var+1] = Kit_TruthSupport( pTruth1, p->nVars );
}
p->fSupports = 1;
}
/**Function*************************************************************
Synopsis [Get the delay of the bound set.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Lpk_SuppDelay( unsigned uSupp, char * pDelays )
{
int Delay, Var;
Delay = 0;
Lpk_SuppForEachVar( uSupp, Var )
Delay = ABC_MAX( Delay, pDelays[Var] );
return Delay + 1;
}
/**Function*************************************************************
Synopsis [Converts support into variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Lpk_SuppToVars( unsigned uBoundSet, char * pVars )
{
int i, nVars = 0;
Lpk_SuppForEachVar( uBoundSet, i )
pVars[nVars++] = i;
return nVars;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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