src/bdd/cudd/cuddRead.c File Reference

#include "util_hack.h"
#include "cuddInt.h"

Include dependency graph for cuddRead.c:

Go to the source code of this file.

Functions
int	Cudd_addRead (FILE *fp, DdManager *dd, DdNode **E, DdNode ***x, DdNode ***y, DdNode ***xn, DdNode ***yn_, int *nx, int *ny, int *m, int *n, int bx, int sx, int by, int sy)
int	Cudd_bddRead (FILE *fp, DdManager *dd, DdNode **E, DdNode ***x, DdNode ***y, int *nx, int *ny, int *m, int *n, int bx, int sx, int by, int sy)
Variables
static char rcsid[]	DD_UNUSED = "$Id: cuddRead.c,v 1.1.1.1 2003/02/24 22:23:52 wjiang Exp $"

---

Function Documentation

int Cudd_addRead	(	FILE *	fp,
		DdManager *	dd,
		DdNode **	E,
		DdNode ***	x,
		DdNode ***	y,
		DdNode ***	xn,
		DdNode ***	yn_,
		int *	nx,
		int *	ny,
		int *	m,
		int *	n,
		int	bx,
		int	sx,
		int	by,
		int	sy
	)

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

Synopsis [Reads in a sparse matrix.]

Description [Reads in a sparse matrix specified in a simple format. The first line of the input contains the numbers of rows and columns. The remaining lines contain the elements of the matrix, one per line. Given a background value (specified by the background field of the manager), only the values different from it are explicitly listed. Each foreground element is described by two integers, i.e., the row and column number, and a real number, i.e., the value.

Cudd_addRead produces an ADD that depends on two sets of variables: x and y. The x variables (x\[0\] ... x\[nx-1\]) encode the row index and the y variables (y\[0\] ... y\[ny-1\]) encode the column index. x\[0\] and y\[0\] are the most significant bits in the indices. The variables may already exist or may be created by the function. The index of x\[i\] is bx+i*sx, and the index of y\[i\] is by+i*sy.

On input, nx and ny hold the numbers of row and column variables already in existence. On output, they hold the numbers of row and column variables actually used by the matrix. When Cudd_addRead creates the variable arrays, the index of x\[i\] is bx+i*sx, and the index of y\[i\] is by+i*sy. When some variables already exist Cudd_addRead expects the indices of the existing x variables to be bx+i*sx, and the indices of the existing y variables to be by+i*sy.

m and n are set to the numbers of rows and columns of the matrix. Their values on input are immaterial. The ADD for the sparse matrix is returned in E, and its reference count is > 0. Cudd_addRead returns 1 in case of success; 0 otherwise.]

SideEffects [nx and ny are set to the numbers of row and column variables. m and n are set to the numbers of rows and columns. x and y are possibly extended to represent the array of row and column variables. Similarly for xn and yn_, which hold on return from Cudd_addRead the complements of the row and column variables.]

SeeAlso [Cudd_addHarwell Cudd_bddRead]

Definition at line 115 of file cuddRead.c.

{
    DdNode *one, *zero;
    DdNode *w, *neW;
    DdNode *minterm1;
    int u, v, err, i, nv;
    int lnx, lny;
    CUDD_VALUE_TYPE val;
    DdNode **lx, **ly, **lxn, **lyn;

    one = DD_ONE(dd);
    zero = DD_ZERO(dd);

    err = fscanf(fp, "%d %d", &u, &v);
    if (err == EOF) {
        return(0);
    } else if (err != 2) {
        return(0);
    }

    *m = u;
    /* Compute the number of x variables. */
    lx = *x; lxn = *xn;
    u--;        /* row and column numbers start from 0 */
    for (lnx=0; u > 0; lnx++) {
        u >>= 1;
    }
    /* Here we rely on the fact that REALLOC of a null pointer is
    ** translates to an ALLOC.
    */
    if (lnx > *nx) {
        *x = lx = REALLOC(DdNode *, *x, lnx);
        if (lx == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
        *xn = lxn =  REALLOC(DdNode *, *xn, lnx);
        if (lxn == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
    }

    *n = v;
    /* Compute the number of y variables. */
    ly = *y; lyn = *yn_;
    v--;        /* row and column numbers start from 0 */
    for (lny=0; v > 0; lny++) {
        v >>= 1;
    }
    /* Here we rely on the fact that REALLOC of a null pointer is
    ** translates to an ALLOC.
    */
    if (lny > *ny) {
        *y = ly = REALLOC(DdNode *, *y, lny);
        if (ly == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
        *yn_ = lyn =  REALLOC(DdNode *, *yn_, lny);
        if (lyn == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
    }

    /* Create all new variables. */
    for (i = *nx, nv = bx + (*nx) * sx; i < lnx; i++, nv += sx) {
        do {
            dd->reordered = 0;
            lx[i] = cuddUniqueInter(dd, nv, one, zero);
        } while (dd->reordered == 1);
        if (lx[i] == NULL) return(0);
        cuddRef(lx[i]);
        do {
            dd->reordered = 0;
            lxn[i] = cuddUniqueInter(dd, nv, zero, one);
        } while (dd->reordered == 1);
        if (lxn[i] == NULL) return(0);
        cuddRef(lxn[i]);
    }
    for (i = *ny, nv = by + (*ny) * sy; i < lny; i++, nv += sy) {
        do {
            dd->reordered = 0;
            ly[i] = cuddUniqueInter(dd, nv, one, zero);
        } while (dd->reordered == 1);
        if (ly[i] == NULL) return(0);
        cuddRef(ly[i]);
        do {
            dd->reordered = 0;
            lyn[i] = cuddUniqueInter(dd, nv, zero, one);
        } while (dd->reordered == 1);
        if (lyn[i] == NULL) return(0);
        cuddRef(lyn[i]);
    }
    *nx = lnx;
    *ny = lny;

    *E = dd->background; /* this call will never cause reordering */
    cuddRef(*E);

    while (! feof(fp)) {
        err = fscanf(fp, "%d %d %lf", &u, &v, &val);
        if (err == EOF) {
            break;
        } else if (err != 3) {
            return(0);
        } else if (u >= *m || v >= *n || u < 0 || v < 0) {
            return(0);
        }
 
        minterm1 = one; cuddRef(minterm1);

        /* Build minterm1 corresponding to this arc */
        for (i = lnx - 1; i>=0; i--) {
            if (u & 1) {
                w = Cudd_addApply(dd, Cudd_addTimes, minterm1, lx[i]);
            } else {
                w = Cudd_addApply(dd, Cudd_addTimes, minterm1, lxn[i]);
            }
            if (w == NULL) {
                Cudd_RecursiveDeref(dd, minterm1);
                return(0);
            }
            cuddRef(w);
            Cudd_RecursiveDeref(dd, minterm1);
            minterm1 = w;
            u >>= 1;
        }
        for (i = lny - 1; i>=0; i--) {
            if (v & 1) {
                w = Cudd_addApply(dd, Cudd_addTimes, minterm1, ly[i]);
            } else {
                w = Cudd_addApply(dd, Cudd_addTimes, minterm1, lyn[i]);
            }
            if (w == NULL) {
                Cudd_RecursiveDeref(dd, minterm1);
                return(0);
            }
            cuddRef(w);
            Cudd_RecursiveDeref(dd, minterm1);
            minterm1 = w;
            v >>= 1;
        }
        /* Create new constant node if necessary.
        ** This call will never cause reordering.
        */
        neW = cuddUniqueConst(dd, val);
        if (neW == NULL) {
            Cudd_RecursiveDeref(dd, minterm1);
            return(0);
        }
        cuddRef(neW);

        w = Cudd_addIte(dd, minterm1, neW, *E);
        if (w == NULL) {
            Cudd_RecursiveDeref(dd, minterm1);
            Cudd_RecursiveDeref(dd, neW);
            return(0);
        }
        cuddRef(w);
        Cudd_RecursiveDeref(dd, minterm1);
        Cudd_RecursiveDeref(dd, neW);
        Cudd_RecursiveDeref(dd, *E);
        *E = w;
    }
    return(1);

} /* end of Cudd_addRead */

int Cudd_bddRead	(	FILE *	fp,
		DdManager *	dd,
		DdNode **	E,
		DdNode ***	x,
		DdNode ***	y,
		int *	nx,
		int *	ny,
		int *	m,
		int *	n,
		int	bx,
		int	sx,
		int	by,
		int	sy
	)

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

Synopsis [Reads in a graph (without labels) given as a list of arcs.]

Description [Reads in a graph (without labels) given as an adjacency matrix. The first line of the input contains the numbers of rows and columns of the adjacency matrix. The remaining lines contain the arcs of the graph, one per line. Each arc is described by two integers, i.e., the row and column number, or the indices of the two endpoints. Cudd_bddRead produces a BDD that depends on two sets of variables: x and y. The x variables (x\[0\] ... x\[nx-1\]) encode the row index and the y variables (y\[0\] ... y\[ny-1\]) encode the column index. x\[0\] and y\[0\] are the most significant bits in the indices. The variables may already exist or may be created by the function. The index of x\[i\] is bx+i*sx, and the index of y\[i\] is by+i*sy.

On input, nx and ny hold the numbers of row and column variables already in existence. On output, they hold the numbers of row and column variables actually used by the matrix. When Cudd_bddRead creates the variable arrays, the index of x\[i\] is bx+i*sx, and the index of y\[i\] is by+i*sy. When some variables already exist, Cudd_bddRead expects the indices of the existing x variables to be bx+i*sx, and the indices of the existing y variables to be by+i*sy.

m and n are set to the numbers of rows and columns of the matrix. Their values on input are immaterial. The BDD for the graph is returned in E, and its reference count is > 0. Cudd_bddRead returns 1 in case of success; 0 otherwise.]

SideEffects [nx and ny are set to the numbers of row and column variables. m and n are set to the numbers of rows and columns. x and y are possibly extended to represent the array of row and column variables.]

SeeAlso [Cudd_addHarwell Cudd_addRead]

Definition at line 338 of file cuddRead.c.

{
    DdNode *one, *zero;
    DdNode *w;
    DdNode *minterm1;
    int u, v, err, i, nv;
    int lnx, lny;
    DdNode **lx, **ly;

    one = DD_ONE(dd);
    zero = Cudd_Not(one);

    err = fscanf(fp, "%d %d", &u, &v);
    if (err == EOF) {
        return(0);
    } else if (err != 2) {
        return(0);
    }

    *m = u;
    /* Compute the number of x variables. */
    lx = *x;
    u--;        /* row and column numbers start from 0 */
    for (lnx=0; u > 0; lnx++) {
        u >>= 1;
    }
    if (lnx > *nx) {
        *x = lx = REALLOC(DdNode *, *x, lnx);
        if (lx == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
    }

    *n = v;
    /* Compute the number of y variables. */
    ly = *y;
    v--;        /* row and column numbers start from 0 */
    for (lny=0; v > 0; lny++) {
        v >>= 1;
    }
    if (lny > *ny) {
        *y = ly = REALLOC(DdNode *, *y, lny);
        if (ly == NULL) {
            dd->errorCode = CUDD_MEMORY_OUT;
            return(0);
        }
    }

    /* Create all new variables. */
    for (i = *nx, nv = bx + (*nx) * sx; i < lnx; i++, nv += sx) {
        do {
            dd->reordered = 0;
            lx[i] = cuddUniqueInter(dd, nv, one, zero);
        } while (dd->reordered == 1);
        if (lx[i] == NULL) return(0);
        cuddRef(lx[i]);
    }
    for (i = *ny, nv = by + (*ny) * sy; i < lny; i++, nv += sy) {
        do {
            dd->reordered = 0;
            ly[i] = cuddUniqueInter(dd, nv, one, zero);
        } while (dd->reordered == 1);
        if (ly[i] == NULL) return(0);
        cuddRef(ly[i]);
    }
    *nx = lnx;
    *ny = lny;

    *E = zero; /* this call will never cause reordering */
    cuddRef(*E);

    while (! feof(fp)) {
        err = fscanf(fp, "%d %d", &u, &v);
        if (err == EOF) {
            break;
        } else if (err != 2) {
            return(0);
        } else if (u >= *m || v >= *n || u < 0 || v < 0) {
            return(0);
        }
 
        minterm1 = one; cuddRef(minterm1);

        /* Build minterm1 corresponding to this arc. */
        for (i = lnx - 1; i>=0; i--) {
            if (u & 1) {
                w = Cudd_bddAnd(dd, minterm1, lx[i]);
            } else {
                w = Cudd_bddAnd(dd, minterm1, Cudd_Not(lx[i]));
            }
            if (w == NULL) {
                Cudd_RecursiveDeref(dd, minterm1);
                return(0);
            }
            cuddRef(w);
            Cudd_RecursiveDeref(dd,minterm1);
            minterm1 = w;
            u >>= 1;
        }
        for (i = lny - 1; i>=0; i--) {
            if (v & 1) {
                w = Cudd_bddAnd(dd, minterm1, ly[i]);
            } else {
                w = Cudd_bddAnd(dd, minterm1, Cudd_Not(ly[i]));
            }
            if (w == NULL) {
                Cudd_RecursiveDeref(dd, minterm1);
                return(0);
            }
            cuddRef(w);
            Cudd_RecursiveDeref(dd, minterm1);
            minterm1 = w;
            v >>= 1;
        }

        w = Cudd_bddAnd(dd, Cudd_Not(minterm1), Cudd_Not(*E));
        if (w == NULL) {
            Cudd_RecursiveDeref(dd, minterm1);
            return(0);
        }
        w = Cudd_Not(w);
        cuddRef(w);
        Cudd_RecursiveDeref(dd, minterm1);
        Cudd_RecursiveDeref(dd, *E);
        *E = w;
    }
    return(1);

} /* end of Cudd_bddRead */

---

Variable Documentation

char rcsid [] DD_UNUSED = "$Id: cuddRead.c,v 1.1.1.1 2003/02/24 22:23:52 wjiang Exp $" [static]

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

FileName [cuddRead.c]

PackageName [cudd]

Synopsis [Functions to read in a matrix]

Description [External procedures included in this module:

• Cudd_addRead()
• Cudd_bddRead()

]

SeeAlso [cudd_addHarwell.c]

Author [Fabio Somenzi]

Copyright [ This file was created at the University of Colorado at Boulder. The University of Colorado at Boulder makes no warranty about the suitability of this software for any purpose. It is presented on an AS IS basis.]

Definition at line 50 of file cuddRead.c.