cuddBddCorr.c File Reference

Correlation between BDDs. More...

#include "util.h"
#include "cuddInt.h"

Include dependency graph for cuddBddCorr.c:

Data Structures
struct	hashEntry

Typedefs
typedef struct hashEntry	HashEntry

Functions
double	Cudd_bddCorrelation (DdManager *manager, DdNode *f, DdNode *g)
	Computes the correlation of f and g. More...
double	Cudd_bddCorrelationWeights (DdManager *manager, DdNode *f, DdNode *g, double *prob)
	Computes the correlation of f and g for given input probabilities. More...
static double	bddCorrelationAux (DdManager *dd, DdNode *f, DdNode *g, st_table *table)
	Performs the recursive step of Cudd_bddCorrelation. More...
static double	bddCorrelationWeightsAux (DdManager *dd, DdNode *f, DdNode *g, double *prob, st_table *table)
	Performs the recursive step of Cudd_bddCorrelationWeigths. More...
static int	CorrelCompare (void const *key1, void const *key2)
	Compares two hash table entries. More...
static int	CorrelHash (void const *key, int modulus)
	Hashes a hash table entry. More...
static enum st_retval	CorrelCleanUp (void *key, void *value, void *arg)
	Frees memory associated with hash table. More...

Detailed Description

Correlation between BDDs.

Author

Fabio Somenzi

Copyright

Copyright (c) 1995-2015, Regents of the University of Colorado

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

Neither the name of the University of Colorado nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Typedef Documentation

HashEntry

typedef struct hashEntry HashEntry

Type of hash-table key.

Function Documentation

bddCorrelationAux()

static double bddCorrelationAux ( DdManager *  dd, DdNode *  f, DdNode *  g, st_table *  table  )

static

Performs the recursive step of Cudd_bddCorrelation.

Returns

the fraction of minterms in the ON-set of the EXNOR of f and g.

Side effects None

See also

bddCorrelationWeightsAux

bddCorrelationWeightsAux()

static double bddCorrelationWeightsAux ( DdManager *  dd, DdNode *  f, DdNode *  g, double *  prob, st_table *  table  )

static

Performs the recursive step of Cudd_bddCorrelationWeigths.

Side effects None

See also

bddCorrelationAux

CorrelCleanUp()

static enum st_retval CorrelCleanUp ( void *  key, void *  value, void *  arg  )

static

Frees memory associated with hash table.

Returns

ST_CONTINUE.

Side effects None

CorrelCompare()

static int CorrelCompare ( void const *  key1, void const *  key2  )

static

Compares two hash table entries.

Returns

0 if they are identical; 1 otherwise.

Side effects None

CorrelHash()

static int CorrelHash ( void const *  key, int  modulus  )

static

Hashes a hash table entry.

It is patterned after st_strhash.

Returns

a value between 0 and modulus.

Side effects None

Cudd_bddCorrelation()

double Cudd_bddCorrelation	(	DdManager *	manager,
		DdNode *	f,
		DdNode *	g
	)

Computes the correlation of f and g.

If f == g, their correlation is 1. If f == g', their correlation is 0.

Returns

the fraction of minterms in the ON-set of the EXNOR of f and g. If it runs out of memory, returns (double)CUDD_OUT_OF_MEM.

Side effects None

See also

Cudd_bddCorrelationWeights

Cudd_bddCorrelationWeights()

double Cudd_bddCorrelationWeights	(	DdManager *	manager,
		DdNode *	f,
		DdNode *	g,
		double *	prob
	)

Computes the correlation of f and g for given input probabilities.

On input, prob[i] is supposed to contain the probability of the i-th input variable to be 1. If f == g, their correlation is

1. If f == g', their correlation is 0. The correlation of f and the constant one gives the probability of f.

Returns

the probability that f and g have the same value. If it runs out of memory, returns (double)CUDD_OUT_OF_MEM.

Side effects None

See also

Cudd_bddCorrelation