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/**CFile****************************************************************
FileName [npn.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName []
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: npn.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "extra.h"
#include "npn.h"
#include "vec.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static int Npn_CompareVecs( void ** p0, void ** p1 );
static Vec_Int_t * Npn_GetSignature( unsigned uTruth, int nVars );
static void Npn_VecPrint( FILE * pFile, Vec_Int_t * vVec );
static int Npn_VecProperty( Vec_Int_t * vVec );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Npn_Experiment()
{
Vec_Int_t ** pVecs;
FILE * pFile;
int nFuncs, Num, i;
pFile = fopen( "npn5.txt", "r" );
pVecs = ALLOC( Vec_Int_t *, 1000000 );
for ( i = 0; ; i++ )
{
if ( fscanf( pFile, "%x", &Num ) != 1 )
break;
pVecs[i] = Npn_GetSignature( Num, 5 );
if ( Npn_VecProperty( pVecs[i] ) )
{
printf( "1s = %2d. ", Extra_CountOnes((unsigned char *)&Num, (1 << 5) / 8) );
Extra_PrintHex( stdout, Num, 5 ); fprintf( stdout, "\n" );
}
}
nFuncs = i;
printf( "Read %d numbers.\n", nFuncs );
fclose( pFile );
/*
// sort the vectors
qsort( (void *)pVecs, nFuncs, sizeof(void *),
(int (*)(const void *, const void *)) Npn_CompareVecs );
pFile = fopen( "npn5ar.txt", "w" );
for ( i = 0; i < nFuncs; i++ )
{
Npn_VecPrint( pFile, pVecs[i] );
Vec_IntFree( pVecs[i] );
}
fclose( pFile );
*/
free( pVecs );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Npn_GetSignature( unsigned uTruth, int nVars )
{
// elementary truth tables
static unsigned Signs[5] = {
0xAAAAAAAA, // 1010 1010 1010 1010 1010 1010 1010 1010
0xCCCCCCCC, // 1010 1010 1010 1010 1010 1010 1010 1010
0xF0F0F0F0, // 1111 0000 1111 0000 1111 0000 1111 0000
0xFF00FF00, // 1111 1111 0000 0000 1111 1111 0000 0000
0xFFFF0000 // 1111 1111 1111 1111 0000 0000 0000 0000
};
Vec_Int_t * vVec;
unsigned uCofactor;
int Count0, Count1, i;
int nBytes = (1 << nVars) / 8;
// collect the number of 1s in each cofactor
vVec = Vec_IntAlloc( 5 );
for ( i = 0; i < nVars; i++ )
{
uCofactor = uTruth & ~Signs[i];
Count0 = Extra_CountOnes( (unsigned char *)&uCofactor, nBytes );
uCofactor = uTruth & Signs[i];
Count1 = Extra_CountOnes( (unsigned char *)&uCofactor, nBytes );
if ( Count0 < Count1 )
Vec_IntPush( vVec, Count0 );
else
Vec_IntPush( vVec, Count1 );
}
// sort them
Vec_IntSort( vVec, 0 );
return vVec;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Npn_CompareVecs( void ** p0, void ** p1 )
{
Vec_Int_t * vVec0 = *p0;
Vec_Int_t * vVec1 = *p1;
int i;
assert( vVec0->nSize == vVec1->nSize );
for ( i = 0; i < vVec0->nSize; i++ )
if ( vVec0->pArray[i] < vVec1->pArray[i] )
return -1;
else if ( vVec0->pArray[i] > vVec1->pArray[i] )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Npn_VecPrint( FILE * pFile, Vec_Int_t * vVec )
{
int i;
for ( i = 0; i < vVec->nSize; i++ )
fprintf( pFile, "%2d ", vVec->pArray[i] );
fprintf( pFile, "\n" );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Npn_VecProperty( Vec_Int_t * vVec )
{
int i;
for ( i = 0; i < vVec->nSize; i++ )
if ( vVec->pArray[i] != i + 1 )
return 0;
return 1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
