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/*
* Copyright (c) 1997-1999, 2003 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*
* executor.c -- execute the fft
*/
/* $Id: executor.c,v 1.1 2008/10/17 06:13:18 scuri Exp $ */
#include "fftw-int.h"
#include <stdio.h>
#include <stdlib.h>
const char *fftw_version = "FFTW V" FFTW_VERSION " ($Id: executor.c,v 1.1 2008/10/17 06:13:18 scuri Exp $)";
/*
* This function is called in other files, so we cannot declare
* it static.
*/
void fftw_strided_copy(int n, fftw_complex *in, int ostride,
fftw_complex *out)
{
int i;
fftw_real r0, r1, i0, i1;
fftw_real r2, r3, i2, i3;
i = 0;
for (; i < (n & 3); ++i) {
out[i * ostride] = in[i];
}
for (; i < n; i += 4) {
r0 = c_re(in[i]);
i0 = c_im(in[i]);
r1 = c_re(in[i + 1]);
i1 = c_im(in[i + 1]);
r2 = c_re(in[i + 2]);
i2 = c_im(in[i + 2]);
r3 = c_re(in[i + 3]);
i3 = c_im(in[i + 3]);
c_re(out[i * ostride]) = r0;
c_im(out[i * ostride]) = i0;
c_re(out[(i + 1) * ostride]) = r1;
c_im(out[(i + 1) * ostride]) = i1;
c_re(out[(i + 2) * ostride]) = r2;
c_im(out[(i + 2) * ostride]) = i2;
c_re(out[(i + 3) * ostride]) = r3;
c_im(out[(i + 3) * ostride]) = i3;
}
}
static void executor_many(int n, const fftw_complex *in,
fftw_complex *out,
fftw_plan_node *p,
int istride,
int ostride,
int howmany, int idist, int odist,
fftw_recurse_kind recurse_kind)
{
int s;
switch (p->type) {
case FFTW_NOTW:
{
fftw_notw_codelet *codelet = p->nodeu.notw.codelet;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist,
out + s * odist,
istride, ostride);
break;
}
default:
for (s = 0; s < howmany; ++s)
fftw_executor_simple(n, in + s * idist,
out + s * odist,
p, istride, ostride,
recurse_kind);
}
}
#ifdef FFTW_ENABLE_VECTOR_RECURSE
/* executor_many_vector is like executor_many, but it pushes the
howmany loop down to the leaves of the transform: */
static void executor_many_vector(int n, const fftw_complex *in,
fftw_complex *out,
fftw_plan_node *p,
int istride,
int ostride,
int howmany, int idist, int odist)
{
int s;
switch (p->type) {
case FFTW_NOTW:
{
fftw_notw_codelet *codelet = p->nodeu.notw.codelet;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist,
out + s * odist,
istride, ostride);
break;
}
case FFTW_TWIDDLE:
{
int r = p->nodeu.twiddle.size;
int m = n / r;
fftw_twiddle_codelet *codelet;
fftw_complex *W;
for (s = 0; s < r; ++s)
executor_many_vector(m, in + s * istride,
out + s * (m * ostride),
p->nodeu.twiddle.recurse,
istride * r, ostride,
howmany, idist, odist);
codelet = p->nodeu.twiddle.codelet;
W = p->nodeu.twiddle.tw->twarray;
/* This may not be the right thing. We maybe should have
the howmany loop for the twiddle codelets at the
topmost level of the recursion, since odist is big;
i.e. separate recursions for twiddle and notwiddle. */
HACK_ALIGN_STACK_EVEN;
for (s = 0; s < howmany; ++s)
codelet(out + s * odist, W, m * ostride, m, ostride);
break;
}
case FFTW_GENERIC:
{
int r = p->nodeu.generic.size;
int m = n / r;
fftw_generic_codelet *codelet;
fftw_complex *W;
for (s = 0; s < r; ++s)
executor_many_vector(m, in + s * istride,
out + s * (m * ostride),
p->nodeu.generic.recurse,
istride * r, ostride,
howmany, idist, odist);
codelet = p->nodeu.generic.codelet;
W = p->nodeu.generic.tw->twarray;
for (s = 0; s < howmany; ++s)
codelet(out + s * odist, W, m, r, n, ostride);
break;
}
case FFTW_RADER:
{
int r = p->nodeu.rader.size;
int m = n / r;
fftw_rader_codelet *codelet;
fftw_complex *W;
for (s = 0; s < r; ++s)
executor_many_vector(m, in + s * istride,
out + s * (m * ostride),
p->nodeu.rader.recurse,
istride * r, ostride,
howmany, idist, odist);
codelet = p->nodeu.rader.codelet;
W = p->nodeu.rader.tw->twarray;
for (s = 0; s < howmany; ++s)
codelet(out + s * odist, W, m, r, ostride,
p->nodeu.rader.rader_data);
break;
}
default:
fftw_die("BUG in executor: invalid plan\n");
break;
}
}
#endif /* FFTW_ENABLE_VECTOR_RECURSE */
/*
* Do *not* declare simple executor static--we need to call it
* from other files...also, preface its name with "fftw_"
* to avoid any possible name collisions.
*/
void fftw_executor_simple(int n, const fftw_complex *in,
fftw_complex *out,
fftw_plan_node *p,
int istride,
int ostride,
fftw_recurse_kind recurse_kind)
{
switch (p->type) {
case FFTW_NOTW:
HACK_ALIGN_STACK_ODD;
(p->nodeu.notw.codelet)(in, out, istride, ostride);
break;
case FFTW_TWIDDLE:
{
int r = p->nodeu.twiddle.size;
int m = n / r;
fftw_twiddle_codelet *codelet;
fftw_complex *W;
#ifdef FFTW_ENABLE_VECTOR_RECURSE
if (recurse_kind == FFTW_NORMAL_RECURSE)
#endif
executor_many(m, in, out,
p->nodeu.twiddle.recurse,
istride * r, ostride,
r, istride, m * ostride,
FFTW_NORMAL_RECURSE);
#ifdef FFTW_ENABLE_VECTOR_RECURSE
else
executor_many_vector(m, in, out,
p->nodeu.twiddle.recurse,
istride * r, ostride,
r, istride, m * ostride);
#endif
codelet = p->nodeu.twiddle.codelet;
W = p->nodeu.twiddle.tw->twarray;
HACK_ALIGN_STACK_EVEN;
codelet(out, W, m * ostride, m, ostride);
break;
}
case FFTW_GENERIC:
{
int r = p->nodeu.generic.size;
int m = n / r;
fftw_generic_codelet *codelet;
fftw_complex *W;
#ifdef FFTW_ENABLE_VECTOR_RECURSE
if (recurse_kind == FFTW_NORMAL_RECURSE)
#endif
executor_many(m, in, out,
p->nodeu.generic.recurse,
istride * r, ostride,
r, istride, m * ostride,
FFTW_NORMAL_RECURSE);
#ifdef FFTW_ENABLE_VECTOR_RECURSE
else
executor_many_vector(m, in, out,
p->nodeu.generic.recurse,
istride * r, ostride,
r, istride, m * ostride);
#endif
codelet = p->nodeu.generic.codelet;
W = p->nodeu.generic.tw->twarray;
codelet(out, W, m, r, n, ostride);
break;
}
case FFTW_RADER:
{
int r = p->nodeu.rader.size;
int m = n / r;
fftw_rader_codelet *codelet;
fftw_complex *W;
#ifdef FFTW_ENABLE_VECTOR_RECURSE
if (recurse_kind == FFTW_NORMAL_RECURSE)
#endif
executor_many(m, in, out,
p->nodeu.rader.recurse,
istride * r, ostride,
r, istride, m * ostride,
FFTW_NORMAL_RECURSE);
#ifdef FFTW_ENABLE_VECTOR_RECURSE
else
executor_many_vector(m, in, out,
p->nodeu.rader.recurse,
istride * r, ostride,
r, istride, m * ostride);
#endif
codelet = p->nodeu.rader.codelet;
W = p->nodeu.rader.tw->twarray;
codelet(out, W, m, r, ostride,
p->nodeu.rader.rader_data);
break;
}
default:
fftw_die("BUG in executor: invalid plan\n");
break;
}
}
static void executor_simple_inplace(int n, fftw_complex *in,
fftw_complex *out,
fftw_plan_node *p,
int istride,
fftw_recurse_kind recurse_kind)
{
switch (p->type) {
case FFTW_NOTW:
HACK_ALIGN_STACK_ODD;
(p->nodeu.notw.codelet)(in, in, istride, istride);
break;
default:
{
fftw_complex *tmp;
if (out)
tmp = out;
else
tmp = (fftw_complex *)
fftw_malloc(n * sizeof(fftw_complex));
fftw_executor_simple(n, in, tmp, p, istride, 1,
recurse_kind);
fftw_strided_copy(n, tmp, istride, in);
if (!out)
fftw_free(tmp);
}
}
}
static void executor_many_inplace(int n, fftw_complex *in,
fftw_complex *out,
fftw_plan_node *p,
int istride,
int howmany, int idist,
fftw_recurse_kind recurse_kind)
{
switch (p->type) {
case FFTW_NOTW:
{
fftw_notw_codelet *codelet = p->nodeu.notw.codelet;
int s;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist,
in + s * idist,
istride, istride);
break;
}
default:
{
int s;
fftw_complex *tmp;
if (out)
tmp = out;
else
tmp = (fftw_complex *)
fftw_malloc(n * sizeof(fftw_complex));
for (s = 0; s < howmany; ++s) {
fftw_executor_simple(n,
in + s * idist,
tmp,
p, istride, 1, recurse_kind);
fftw_strided_copy(n, tmp, istride, in + s * idist);
}
if (!out)
fftw_free(tmp);
}
}
}
/* user interface */
void fftw(fftw_plan plan, int howmany, fftw_complex *in, int istride,
int idist, fftw_complex *out, int ostride, int odist)
{
int n = plan->n;
if (plan->flags & FFTW_IN_PLACE) {
if (howmany == 1) {
executor_simple_inplace(n, in, out, plan->root, istride,
plan->recurse_kind);
} else {
executor_many_inplace(n, in, out, plan->root, istride, howmany,
idist, plan->recurse_kind);
}
} else {
if (howmany == 1) {
fftw_executor_simple(n, in, out, plan->root, istride, ostride,
plan->recurse_kind);
} else {
#ifdef FFTW_ENABLE_VECTOR_RECURSE
int vector_size = plan->vector_size;
if (vector_size <= 1)
#endif
executor_many(n, in, out, plan->root, istride, ostride,
howmany, idist, odist, plan->recurse_kind);
#ifdef FFTW_ENABLE_VECTOR_RECURSE
else {
int s;
int num_vects = howmany / vector_size;
fftw_plan_node *root = plan->root;
for (s = 0; s < num_vects; ++s)
executor_many_vector(n,
in + s * (vector_size * idist),
out + s * (vector_size * odist),
root,
istride, ostride,
vector_size, idist, odist);
s = howmany % vector_size;
if (s > 0)
executor_many(n,
in + num_vects * (vector_size * idist),
out + num_vects * (vector_size * odist),
root,
istride, ostride,
s, idist, odist,
FFTW_NORMAL_RECURSE);
}
#endif
}
}
}
void fftw_one(fftw_plan plan, fftw_complex *in, fftw_complex *out)
{
int n = plan->n;
if (plan->flags & FFTW_IN_PLACE)
executor_simple_inplace(n, in, out, plan->root, 1,
plan->recurse_kind);
else
fftw_executor_simple(n, in, out, plan->root, 1, 1,
plan->recurse_kind);
}
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