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/**CFile****************************************************************
FileName [lpkMux.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Fast Boolean matching for LUT structures.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: lpkMux.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "lpkInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Find the best cofactoring variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Lpk_MapTreeBestVar( Lpk_Man_t * p, unsigned * pTruth, int nVars )
{
// Kit_DsdNtk_t * ppNtks[2], * pTemp;
unsigned * pCof0 = Vec_PtrEntry( p->vTtNodes, 0 );
unsigned * pCof1 = Vec_PtrEntry( p->vTtNodes, 1 );
int i, iBestVar, nSuppSizeCur0, nSuppSizeCur1, nSuppSizeCur, nSuppSizeMin;
// int nPrimeSizeCur0, nPrimeSizeCur1, nPrimeSizeCur, nPrimeSizeMin;
// iterate through variables
iBestVar = -1;
nSuppSizeMin = ABC_INFINITY;
// nPrimeSizeMin = ABC_INFINITY;
for ( i = 0; i < nVars; i++ )
{
// cofactor the functiona and get support sizes
Kit_TruthCofactor0New( pCof0, pTruth, nVars, i );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, i );
nSuppSizeCur0 = Kit_TruthSupportSize( pCof0, nVars );
nSuppSizeCur1 = Kit_TruthSupportSize( pCof1, nVars );
nSuppSizeCur = nSuppSizeCur0 + nSuppSizeCur1;
/*
// check the size of the largest prime components
ppNtks[0] = Kit_DsdDecompose( pCof0, nVars );
ppNtks[1] = Kit_DsdDecompose( pCof1, nVars );
// compute the largest non-decomp block
nPrimeSizeCur0 = Kit_DsdNonDsdSizeMax(ppNtks[0]);
nPrimeSizeCur1 = Kit_DsdNonDsdSizeMax(ppNtks[1]);
nPrimeSizeCur = KIT_MAX( nPrimeSizeCur0, nPrimeSizeCur1 );
printf( "Evaluating variable %c:\n", 'a'+i );
// Kit_DsdPrintExpanded( ppNtks[0] );
// Kit_DsdPrintExpanded( ppNtks[1] );
ppNtks[0] = Kit_DsdExpand( pTemp = ppNtks[0] );
Kit_DsdNtkFree( pTemp );
ppNtks[1] = Kit_DsdExpand( pTemp = ppNtks[1] );
Kit_DsdNtkFree( pTemp );
Kit_DsdPrint( stdout, ppNtks[0] );
Kit_DsdPrint( stdout, ppNtks[1] );
// Lpk_DsdEvalSets( p, ppNtks[0], ppNtks[1] );
// free the networks
Kit_DsdNtkFree( ppNtks[0] );
Kit_DsdNtkFree( ppNtks[1] );
*/
// compare this variable with other variables
if ( nSuppSizeMin > nSuppSizeCur ) //|| (nSuppSizeMin == nSuppSizeCur && nPrimeSizeMin > nPrimeSizeCur ) )
{
nSuppSizeMin = nSuppSizeCur;
// nPrimeSizeMin = nPrimeSizeCur;
iBestVar = i;
}
}
printf( "\n" );
assert( iBestVar != -1 );
return iBestVar;
}
/**Function*************************************************************
Synopsis [Maps the function by the best cofactoring.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Obj_t * Lpk_MapTreeMux_rec( Lpk_Man_t * p, unsigned * pTruth, int nVars, If_Obj_t ** ppLeaves )
{
If_Obj_t * pObj0, * pObj1;
Kit_DsdNtk_t * ppNtks[2];
unsigned * pCof0 = Vec_PtrEntry( p->vTtNodes, 0 );
unsigned * pCof1 = Vec_PtrEntry( p->vTtNodes, 1 );
int iBestVar;
assert( nVars > 3 );
p->fCalledOnce = 1;
// cofactor w.r.t. the best variable
iBestVar = Lpk_MapTreeBestVar( p, pTruth, nVars );
Kit_TruthCofactor0New( pCof0, pTruth, nVars, iBestVar );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, iBestVar );
// decompose the functions
ppNtks[0] = Kit_DsdDecompose( pCof0, nVars );
ppNtks[1] = Kit_DsdDecompose( pCof1, nVars );
if ( p->pPars->fVeryVerbose )
{
printf( "Cofactoring w.r.t. var %c (%d -> %d+%d supp vars):\n",
'a'+iBestVar, nVars, Kit_TruthSupportSize(pCof0, nVars), Kit_TruthSupportSize(pCof1, nVars) );
Kit_DsdPrintExpanded( ppNtks[0] );
Kit_DsdPrintExpanded( ppNtks[1] );
}
// map the DSD structures
pObj0 = Lpk_MapTree_rec( p, ppNtks[0], ppLeaves, ppNtks[0]->Root, NULL );
pObj1 = Lpk_MapTree_rec( p, ppNtks[1], ppLeaves, ppNtks[1]->Root, NULL );
Kit_DsdNtkFree( ppNtks[0] );
Kit_DsdNtkFree( ppNtks[1] );
return If_ManCreateMux( p->pIfMan, pObj0, pObj1, ppLeaves[iBestVar] );
}
/**Function*************************************************************
Synopsis [Implements support-reducing decomposition.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Obj_t * Lpk_MapSuppRedDec_rec( Lpk_Man_t * p, unsigned * pTruth, int nVars, If_Obj_t ** ppLeaves )
{
Kit_DsdNtk_t * pNtkDec, * pNtkComp;
If_Obj_t * pObjNew;
unsigned * pCof0 = Vec_PtrEntry( p->vTtNodes, 0 );
unsigned * pCof1 = Vec_PtrEntry( p->vTtNodes, 1 );
unsigned * pDec0 = Vec_PtrEntry( p->vTtNodes, 2 );
unsigned * pDec1 = Vec_PtrEntry( p->vTtNodes, 3 );
unsigned * pDec = Vec_PtrEntry( p->vTtNodes, 4 );
unsigned * pCo00 = Vec_PtrEntry( p->vTtNodes, 5 );
unsigned * pCo01 = Vec_PtrEntry( p->vTtNodes, 6 );
unsigned * pCo10 = Vec_PtrEntry( p->vTtNodes, 7 );
unsigned * pCo11 = Vec_PtrEntry( p->vTtNodes, 8 );
unsigned * pCo0 = Vec_PtrEntry( p->vTtNodes, 9 );
unsigned * pCo1 = Vec_PtrEntry( p->vTtNodes, 10 );
unsigned * pCo = Vec_PtrEntry( p->vTtNodes, 11 );
int TrueMint0, TrueMint1;
int uSubsets, uSubset0, uSubset1, iVar, iVarReused, i;
// determine if supp-red decomposition exists
uSubsets = Lpk_MapSuppRedDecSelect( p, pTruth, nVars, &iVar, &iVarReused );
if ( uSubsets == 0 )
return NULL;
// get the bound sets
uSubset0 = uSubsets & 0xFFFF;
uSubset1 = uSubsets >> 16;
// get the cofactors
Kit_TruthCofactor0New( pCof0, pTruth, nVars, iVar );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, iVar );
// find any true assignments of the cofactors
TrueMint0 = Kit_TruthFindFirstBit( pCof0, nVars );
TrueMint1 = Kit_TruthFindFirstBit( pCof1, nVars );
assert( TrueMint0 >= 0 && TrueMint1 >= 0 );
// cofactor the cofactors according to these minterms
Kit_TruthCopy( pDec0, pCof0, nVars );
Kit_TruthCopy( pDec1, pCof1, nVars );
for ( i = 0; i < nVars; i++ )
if ( !(uSubset0 & (1 << i)) )
{
if ( TrueMint0 & (1 << i) )
Kit_TruthCofactor1( pDec0, nVars, i );
else
Kit_TruthCofactor0( pDec0, nVars, i );
}
for ( i = 0; i < nVars; i++ )
if ( !(uSubset1 & (1 << i)) )
{
if ( TrueMint1 & (1 << i) )
Kit_TruthCofactor1( pDec1, nVars, i );
else
Kit_TruthCofactor0( pDec1, nVars, i );
}
// get the decomposed function
Kit_TruthMuxVar( pDec, pDec0, pDec1, nVars, iVar );
// derive the remainders
Kit_TruthAndPhase( pCo00, pCof0, pDec0, nVars, 0, 1 );
Kit_TruthAndPhase( pCo01, pCof0, pDec0, nVars, 0, 0 );
Kit_TruthAndPhase( pCo10, pCof1, pDec1, nVars, 0, 1 );
Kit_TruthAndPhase( pCo11, pCof1, pDec1, nVars, 0, 0 );
// quantify bound set variables
for ( i = 0; i < nVars; i++ )
if ( uSubset0 & (1 << i) )
{
Kit_TruthExist( pCo00, nVars, i );
Kit_TruthExist( pCo01, nVars, i );
}
for ( i = 0; i < nVars; i++ )
if ( uSubset1 & (1 << i) )
{
Kit_TruthExist( pCo10, nVars, i );
Kit_TruthExist( pCo11, nVars, i );
}
// derive the functions by composing them with the new variable (iVarReused)
Kit_TruthMuxVar( pCo0, pCo00, pCo01, nVars, iVarReused );
Kit_TruthMuxVar( pCo1, pCo10, pCo11, nVars, iVarReused );
// derive the composition function
Kit_TruthMuxVar( pCo , pCo0 , pCo1 , nVars, iVar );
// process the decomposed function
pNtkDec = Kit_DsdDecompose( pDec, nVars );
Kit_DsdPrint( stdout, pNtkDec );
ppLeaves[iVarReused] = Lpk_MapTree_rec( p, pNtkDec, ppLeaves, pNtkDec->Root, NULL );
Kit_DsdNtkFree( pNtkDec );
// process the composition function
pNtkComp = Kit_DsdDecompose( pCo, nVars );
Kit_DsdPrint( stdout, pNtkComp );
pObjNew = Lpk_MapTree_rec( p, pNtkComp, ppLeaves, pNtkComp->Root, NULL );
Kit_DsdNtkFree( pNtkComp );
return pObjNew;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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