mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-14 00:35:06 +00:00
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/*
|
|
* 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 "rdft/rdft.h"
|
|
|
|
/* Check if the vecsz/sz strides are consistent with the problem
|
|
being in-place for vecsz.dim[vdim], or for all dimensions
|
|
if vdim == RNK_MINFTY. We can't just use tensor_inplace_strides
|
|
because rdft transforms have the unfortunate property of
|
|
differing input and output sizes. This routine is not
|
|
exhaustive; we only return 1 for the most common case. */
|
|
int X(rdft2_inplace_strides)(const problem_rdft2 *p, int vdim)
|
|
{
|
|
INT N, Nc;
|
|
INT rs, cs;
|
|
int i;
|
|
|
|
for (i = 0; i + 1 < p->sz->rnk; ++i)
|
|
if (p->sz->dims[i].is != p->sz->dims[i].os)
|
|
return 0;
|
|
|
|
if (!FINITE_RNK(p->vecsz->rnk) || p->vecsz->rnk == 0)
|
|
return 1;
|
|
if (!FINITE_RNK(vdim)) { /* check all vector dimensions */
|
|
for (vdim = 0; vdim < p->vecsz->rnk; ++vdim)
|
|
if (!X(rdft2_inplace_strides)(p, vdim))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
A(vdim < p->vecsz->rnk);
|
|
if (p->sz->rnk == 0)
|
|
return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os);
|
|
|
|
N = X(tensor_sz)(p->sz);
|
|
Nc = (N / p->sz->dims[p->sz->rnk-1].n) *
|
|
(p->sz->dims[p->sz->rnk-1].n/2 + 1);
|
|
X(rdft2_strides)(p->kind, p->sz->dims + p->sz->rnk - 1, &rs, &cs);
|
|
|
|
/* the factor of 2 comes from the fact that RS is the stride
|
|
of p->r0 and p->r1, which is twice as large as the strides
|
|
in the r2r case */
|
|
return(p->vecsz->dims[vdim].is == p->vecsz->dims[vdim].os
|
|
&& (X(iabs)(2 * p->vecsz->dims[vdim].os)
|
|
>= X(imax)(2 * Nc * X(iabs)(cs), N * X(iabs)(rs))));
|
|
}
|