/*
* in: array of n/2 + 1 complex numbers (* howmany).
* out: array of n real numbers (* howmany).
* work: array of n real numbers (stride 1)
*
* We must have out != in if dist < stride.
*/
void rfftw_c2real_aux(fftw_plan plan, int howmany,
fftw_complex *in, int istride, int idist,
fftw_real *out, int ostride, int odist,
fftw_real *work)
{
fftw_plan_node *p = plan->root;
switch (p->type) {
case FFTW_HC2REAL:
{
fftw_hc2real_codelet *codelet = p->nodeu.hc2real.codelet;
int j;
HACK_ALIGN_STACK_ODD();
for (j = 0; j < howmany; ++j)
codelet(&c_re(*(in + j * idist)),
&c_im(*(in + j * idist)),
out + j * odist,
istride * 2, istride * 2, ostride);
break;
}
default:
{
int j, n = plan->n;
for (j = 0; j < howmany; ++j, in += idist, out += odist) {
rfftw_c2hc(n, in, istride, work);
rfftw_executor_simple(n, work, out, p, 1, ostride);
}
break;
}
}
}
static void rexecutor_many_inplace(int n, fftw_real *in,
fftw_real *out,
fftw_plan_node *p,
int istride,
int howmany, int idist,
fftw_recurse_kind recurse_kind)
{
switch (p->type) {
case FFTW_REAL2HC:
{
fftw_real2hc_codelet *codelet = p->nodeu.real2hc.codelet;
int s;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist, in + s * idist,
in + n * istride + s * idist,
istride, istride, -istride);
break;
}
case FFTW_HC2REAL:
{
fftw_hc2real_codelet *codelet = p->nodeu.hc2real.codelet;
int s;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist, in + n * istride + s * idist,
in + s * idist,
istride, -istride, istride);
break;
}
default:
{
int s;
fftw_real *tmp;
if (out)
tmp = out;
else
tmp = (fftw_real *) fftw_malloc(n * sizeof(fftw_real));
for (s = 0; s < howmany; ++s) {
rfftw_executor_simple(n,
in + s * idist,
tmp,
p, istride, 1, recurse_kind);
rfftw_strided_copy(n, tmp, istride, in + s * idist);
}
if (!out)
fftw_free(tmp);
}
}
}
void rfftw_one(fftw_plan plan, fftw_real *in, fftw_real *out)
{
int n = plan->n;
if (plan->flags & FFTW_IN_PLACE)
rexecutor_simple_inplace(n, in, out, plan->root, 1,
plan->recurse_kind);
else
rfftw_executor_simple(n, in, out, plan->root, 1, 1,
plan->recurse_kind);
}
/* user interface */
void rfftw(fftw_plan plan, int howmany, fftw_real *in, int istride,
int idist, fftw_real *out, int ostride, int odist)
{
int n = plan->n;
if (plan->flags & FFTW_IN_PLACE) {
if (howmany == 1) {
rexecutor_simple_inplace(n, in, out, plan->root, istride,
plan->recurse_kind);
} else {
rexecutor_many_inplace(n, in, out, plan->root, istride, howmany,
idist, plan->recurse_kind);
}
} else {
if (howmany == 1) {
rfftw_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
rexecutor_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)
rexecutor_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)
rexecutor_many(n,
in + num_vects * (vector_size*idist),
out + num_vects * (vector_size*odist),
root,
istride, ostride,
s, idist, odist,
FFTW_NORMAL_RECURSE);
}
#endif
}
}
}
static void rexecutor_many(int n, fftw_real *in,
fftw_real *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_REAL2HC:
{
fftw_real2hc_codelet *codelet = p->nodeu.real2hc.codelet;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist, out + s * odist,
out + n * ostride + s * odist,
istride, ostride, -ostride);
break;
}
case FFTW_HC2REAL:
{
fftw_hc2real_codelet *codelet = p->nodeu.hc2real.codelet;
HACK_ALIGN_STACK_ODD;
for (s = 0; s < howmany; ++s)
codelet(in + s * idist, in + n * istride + s * idist,
out + s * odist,
istride, -istride, ostride);
break;
}
default:
for (s = 0; s < howmany; ++s)
rfftw_executor_simple(n, in + s * idist,
out + s * odist,
p, istride, ostride,
recurse_kind);
}
}
/*
* in: array of n real numbers (* howmany).
* out: array of n/2 + 1 complex numbers (* howmany).
* work: array of n real numbers (stride 1)
*
* We must have out != in if dist < stride.
*/
void rfftw_real2c_aux(fftw_plan plan, int howmany,
fftw_real *in, int istride, int idist,
fftw_complex *out, int ostride, int odist,
fftw_real *work)
{
fftw_plan_node *p = plan->root;
int j;
switch (p->type) {
case FFTW_REAL2HC:
{
fftw_real2hc_codelet *codelet = p->nodeu.real2hc.codelet;
int n = plan->n;
int n2 = (n & 1) ? 0 : (n + 1) / 2;
HACK_ALIGN_STACK_ODD;
for (j = 0; j < howmany; ++j, out += odist) {
codelet(in + j * idist,
&c_re(*out),
&c_im(*out),
istride, ostride * 2, ostride * 2);
c_im(out[0]) = 0.0;
c_im(out[n2 * ostride]) = 0.0;
}
break;
}
default:
{
int n = plan->n;
fftw_recurse_kind recurse_kind = plan->recurse_kind;
for (j = 0; j < howmany; ++j, in += idist, out += odist) {
rfftw_executor_simple(n, in, work, p, istride, 1,
recurse_kind);
rfftw_hc2c(n, work, out, ostride);
}
break;
}
}
}
static void rexecutor_simple_inplace(int n, fftw_real *in,
fftw_real *out,
fftw_plan_node *p,
int istride,
fftw_recurse_kind recurse_kind)
{
switch (p->type) {
case FFTW_REAL2HC:
HACK_ALIGN_STACK_ODD;
(p->nodeu.real2hc.codelet) (in, in, in + n * istride,
istride, istride, -istride);
break;
case FFTW_HC2REAL:
HACK_ALIGN_STACK_ODD;
(p->nodeu.hc2real.codelet) (in, in + n * istride, in,
istride, -istride, istride);
break;
default:
{
fftw_real *tmp;
if (out)
tmp = out;
else
tmp = (fftw_real *) fftw_malloc(n * sizeof(fftw_real));
rfftw_executor_simple(n, in, tmp, p, istride, 1,
recurse_kind);
rfftw_strided_copy(n, tmp, istride, in);
if (!out)
fftw_free(tmp);
}
}
}
