cuddAddInv.c File Reference

#include "misc/util/util_hack.h"
#include "cuddInt.h"

Go to the source code of this file.

Functions
DdNode *	Cudd_addScalarInverse (DdManager *dd, DdNode *f, DdNode *epsilon)
DdNode *	cuddAddScalarInverseRecur (DdManager *dd, DdNode *f, DdNode *epsilon)

Variables
static ABC_NAMESPACE_IMPL_START char rcsid[]	DD_UNUSED = "$Id: cuddAddInv.c,v 1.9 2004/08/13 18:04:45 fabio Exp $"

Function Documentation

DdNode* Cudd_addScalarInverse	(	DdManager *	dd,
		DdNode *	f,
		DdNode *	epsilon
	)

AutomaticStart AutomaticEnd Function********************************************************************

Synopsis [Computes the scalar inverse of an ADD.]

Description [Computes an n ADD where the discriminants are the multiplicative inverses of the corresponding discriminants of the argument ADD. Returns a pointer to the resulting ADD in case of success. Returns NULL if any discriminants smaller than epsilon is encountered.]

SideEffects [None]

Definition at line 120 of file cuddAddInv.c.

{
    DdNode *res;

    if (!cuddIsConstant(epsilon)) {
        (void) fprintf(dd->err,"Invalid epsilon\n");
        return(NULL);
    }
    do {
        dd->reordered = 0;
        res  = cuddAddScalarInverseRecur(dd,f,epsilon);
    } while (dd->reordered == 1);
    return(res);

} /* end of Cudd_addScalarInverse */

DdNode* cuddAddScalarInverseRecur	(	DdManager *	dd,
		DdNode *	f,
		DdNode *	epsilon
	)

Function********************************************************************

Synopsis [Performs the recursive step of addScalarInverse.]

Description [Returns a pointer to the resulting ADD in case of success. Returns NULL if any discriminants smaller than epsilon is encountered.]

SideEffects [None]

Definition at line 156 of file cuddAddInv.c.

{
    DdNode *t, *e, *res;
    CUDD_VALUE_TYPE value;

    statLine(dd);
    if (cuddIsConstant(f)) {
        if (ddAbs(cuddV(f)) < cuddV(epsilon)) return(NULL);
        value = 1.0 / cuddV(f);
        res = cuddUniqueConst(dd,value);
        return(res);
    }

    res = cuddCacheLookup2(dd,Cudd_addScalarInverse,f,epsilon);
    if (res != NULL) return(res);

    t = cuddAddScalarInverseRecur(dd,cuddT(f),epsilon);
    if (t == NULL) return(NULL);
    cuddRef(t);

    e = cuddAddScalarInverseRecur(dd,cuddE(f),epsilon);
    if (e == NULL) {
        Cudd_RecursiveDeref(dd, t);
        return(NULL);
    }
    cuddRef(e);

    res = (t == e) ? t : cuddUniqueInter(dd,(int)f->index,t,e);
    if (res == NULL) {
        Cudd_RecursiveDeref(dd, t);
        Cudd_RecursiveDeref(dd, e);
        return(NULL);
    }
    cuddDeref(t);
    cuddDeref(e);

    cuddCacheInsert2(dd,Cudd_addScalarInverse,f,epsilon,res);

    return(res);

} /* end of cuddAddScalarInverseRecur */

Variable Documentation

ABC_NAMESPACE_IMPL_START char rcsid [] DD_UNUSED = "$Id: cuddAddInv.c,v 1.9 2004/08/13 18:04:45 fabio Exp $"

static

CFile***********************************************************************

FileName [cuddAddInv.c]

PackageName [cudd]

Synopsis [Function to compute the scalar inverse of an ADD.]

Description [External procedures included in this module:

• Cudd_addScalarInverse()

Internal procedures included in this module:

• cuddAddScalarInverseRecur()

]

Author [Fabio Somenzi]

Copyright [Copyright (c) 1995-2004, 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.]

Definition at line 82 of file cuddAddInv.c.