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/**CFile****************************************************************
FileName [extraUtilBitMatrix.c]
PackageName [extra]
Synopsis [Various reusable software utilities.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - September 1, 2003.]
Revision [$Id: extraUtilBitMatrix.c,v 1.0 2003/09/01 00:00:00 alanmi Exp $]
***********************************************************************/
#include "extra.h"
/*---------------------------------------------------------------------------*/
/* Constant declarations */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* Stucture declarations */
/*---------------------------------------------------------------------------*/
struct Extra_BitMat_t_
{
unsigned ** ppData; // bit data
int nSize; // the number of bits in one dimension
int nWords; // the number of words in one dimension
int nBitShift; // the number of bits to shift to get words
unsigned uMask; // the mask to get the number of bits in the word
int nLookups; // the number of lookups
int nInserts; // the number of inserts
int nDeletes; // the number of deletions
};
/*---------------------------------------------------------------------------*/
/* Type declarations */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* Variable declarations */
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* Macro declarations */
/*---------------------------------------------------------------------------*/
/**AutomaticStart*************************************************************/
/*---------------------------------------------------------------------------*/
/* Static function prototypes */
/*---------------------------------------------------------------------------*/
/**AutomaticEnd***************************************************************/
/*---------------------------------------------------------------------------*/
/* Definition of exported functions */
/*---------------------------------------------------------------------------*/
/**Function*************************************************************
Synopsis [Starts the bit matrix.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Extra_BitMat_t * Extra_BitMatrixStart( int nSize )
{
Extra_BitMat_t * p;
int i;
p = ALLOC( Extra_BitMat_t, 1 );
memset( p, 0, sizeof(Extra_BitMat_t) );
p->nSize = nSize;
p->nBitShift = (sizeof(unsigned) == 4) ? 5: 6;
p->uMask = (sizeof(unsigned) == 4) ? 31: 63;
p->nWords = nSize / (8 * sizeof(unsigned)) + ((nSize % (8 * sizeof(unsigned))) > 0);
p->ppData = ALLOC( unsigned *, nSize );
p->ppData[0] = ALLOC( unsigned, nSize * p->nWords );
memset( p->ppData[0], 0, sizeof(unsigned) * nSize * p->nWords );
for ( i = 1; i < nSize; i++ )
p->ppData[i] = p->ppData[i-1] + p->nWords;
return p;
}
/**Function*************************************************************
Synopsis [Stops the bit matrix.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixClean( Extra_BitMat_t * p )
{
memset( p->ppData[0], 0, sizeof(unsigned) * p->nSize * p->nWords );
}
/**Function*************************************************************
Synopsis [Stops the bit matrix.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixStop( Extra_BitMat_t * p )
{
FREE( p->ppData[0] );
FREE( p->ppData );
FREE( p );
}
/**Function*************************************************************
Synopsis [Prints the bit-matrix.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixPrint( Extra_BitMat_t * pMat )
{
int i, k, nVars;
printf( "\n" );
nVars = Extra_BitMatrixReadSize( pMat );
for ( i = 0; i < nVars; i++ )
{
for ( k = 0; k <= i; k++ )
printf( " " );
for ( k = i+1; k < nVars; k++ )
if ( Extra_BitMatrixLookup1( pMat, i, k ) )
printf( "1" );
else
printf( "." );
printf( "\n" );
}
}
/**Function*************************************************************
Synopsis [Reads the matrix size.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixReadSize( Extra_BitMat_t * p )
{
return p->nSize;
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixInsert1( Extra_BitMat_t * p, int i, int k )
{
p->nInserts++;
if ( i < k )
p->ppData[i][k>>p->nBitShift] |= (1<<(k & p->uMask));
else
p->ppData[k][i>>p->nBitShift] |= (1<<(i & p->uMask));
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixLookup1( Extra_BitMat_t * p, int i, int k )
{
p->nLookups++;
if ( i < k )
return ((p->ppData[i][k>>p->nBitShift] & (1<<(k & p->uMask))) > 0);
else
return ((p->ppData[k][i>>p->nBitShift] & (1<<(i & p->uMask))) > 0);
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixDelete1( Extra_BitMat_t * p, int i, int k )
{
p->nDeletes++;
if ( i < k )
p->ppData[i][k>>p->nBitShift] &= ~(1<<(k & p->uMask));
else
p->ppData[k][i>>p->nBitShift] &= ~(1<<(i & p->uMask));
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixInsert2( Extra_BitMat_t * p, int i, int k )
{
p->nInserts++;
if ( i > k )
p->ppData[i][k>>p->nBitShift] |= (1<<(k & p->uMask));
else
p->ppData[k][i>>p->nBitShift] |= (1<<(i & p->uMask));
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixLookup2( Extra_BitMat_t * p, int i, int k )
{
p->nLookups++;
if ( i > k )
return ((p->ppData[i][k>>p->nBitShift] & (1<<(k & p->uMask))) > 0);
else
return ((p->ppData[k][i>>p->nBitShift] & (1<<(i & p->uMask))) > 0);
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixDelete2( Extra_BitMat_t * p, int i, int k )
{
p->nDeletes++;
if ( i > k )
p->ppData[i][k>>p->nBitShift] &= ~(1<<(k & p->uMask));
else
p->ppData[k][i>>p->nBitShift] &= ~(1<<(i & p->uMask));
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixOr( Extra_BitMat_t * p, int i, unsigned * pInfo )
{
int w;
for ( w = 0; w < p->nWords; w++ )
p->ppData[i][w] |= pInfo[w];
}
/**Function*************************************************************
Synopsis [Inserts the element into the upper part.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Extra_BitMatrixOrTwo( Extra_BitMat_t * p, int i, int j )
{
int w;
for ( w = 0; w < p->nWords; w++ )
p->ppData[i][w] = p->ppData[j][w] = (p->ppData[i][w] | p->ppData[j][w]);
}
/**Function*************************************************************
Synopsis [Counts the number of 1's in the upper rectangle.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixCountOnesUpper( Extra_BitMat_t * p )
{
int i, k, nTotal = 0;
for ( i = 0; i < p->nSize; i++ )
for ( k = i + 1; k < p->nSize; k++ )
nTotal += ( (p->ppData[i][k/32] & (1 << (k%32))) > 0 );
return nTotal;
}
/**Function*************************************************************
Synopsis [Returns 1 if the matrices have no entries in common.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixIsDisjoint( Extra_BitMat_t * p1, Extra_BitMat_t * p2 )
{
int i, w;
assert( p1->nSize == p2->nSize );
for ( i = 0; i < p1->nSize; i++ )
for ( w = 0; w < p1->nWords; w++ )
if ( p1->ppData[i][w] & p2->ppData[i][w] )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Returns 1 if the matrix is a set of cliques.]
Description [For example pairwise symmetry info should satisfy this property.]
SideEffects []
SeeAlso []
***********************************************************************/
int Extra_BitMatrixIsClique( Extra_BitMat_t * pMat )
{
int v, u, i;
for ( v = 0; v < pMat->nSize; v++ )
for ( u = v+1; u < pMat->nSize; u++ )
{
if ( !Extra_BitMatrixLookup1( pMat, v, u ) )
continue;
// v and u are symmetric
for ( i = 0; i < pMat->nSize; i++ )
{
if ( i == v || i == u )
continue;
// i is neither v nor u
// the symmetry status of i is the same w.r.t. to v and u
if ( Extra_BitMatrixLookup1( pMat, i, v ) != Extra_BitMatrixLookup1( pMat, i, u ) )
return 0;
}
}
return 1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
