/*

 * Copyright (c) 2003, 2007-14 Matteo Frigo

 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#include "kernel/ifftw.h"

/*

  common routines for Rader solvers 

*/

/* shared twiddle and omega lists, keyed by two/three integers. */

struct rader_tls {

     INT k1, k2, k3;

     R *W;

     int refcnt;

     rader_tl *cdr; 

};

void X(rader_tl_insert)(INT k1, INT k2, INT k3, R *W, rader_tl **tl)

{

     rader_tl *t = (rader_tl *) MALLOC(sizeof(rader_tl), TWIDDLES);

     t->k1 = k1; t->k2 = k2; t->k3 = k3; t->W = W;

     t->refcnt = 1; t->cdr = *tl; *tl = t;

}

R *X(rader_tl_find)(INT k1, INT k2, INT k3, rader_tl *t)

{

     while (t && (t->k1 != k1 || t->k2 != k2 || t->k3 != k3))

    t = t->cdr;

     if (t) {

    ++t->refcnt;

    return t->W;

     } else 

    return 0;

}

void X(rader_tl_delete)(R *W, rader_tl **tl)

{

     if (W) {

    rader_tl **tp, *t;

    for (tp = tl; (t = *tp) && t->W != W; tp = &t->cdr)

         ;

    if (t && --t->refcnt <= 0) {

         *tp = t->cdr;

         X(ifree)(t->W);

         X(ifree)(t);

    }

     }

}