ref: d6839757dffdf592ae300726a64e0f3199a9cd56
dir: /libfaad/fftw/putils.c/
/*
* Copyright (c) 1997-1999 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
*
*/
/*
* putils.c -- plan utilities shared by planner.c and rplanner.c
*/
/* $Id: putils.c,v 1.1 2002/04/07 21:26:05 menno Exp $ */
#ifdef FFTW_USING_CILK
#include <cilk.h>
#include <cilk-compat.h>
#endif
#include <fftw-int.h>
#include <stdlib.h>
#include <stdio.h>
int fftw_node_cnt = 0;
int fftw_plan_cnt = 0;
/*
* These two constants are used for the FFTW_ESTIMATE flag to help
* create a heuristic plan. They don't affect FFTW_MEASURE.
*/
#define NOTW_OPTIMAL_SIZE 32
#define TWIDDLE_OPTIMAL_SIZE 12
#define IS_POWER_OF_TWO(n) (((n) & ((n) - 1)) == 0)
/* constructors --- I wish I had ML */
fftw_plan_node *fftw_make_node(void)
{
fftw_plan_node *p = (fftw_plan_node *)
fftw_malloc(sizeof(fftw_plan_node));
p->refcnt = 0;
fftw_node_cnt++;
return p;
}
void fftw_use_node(fftw_plan_node *p)
{
++p->refcnt;
}
fftw_plan_node *fftw_make_node_notw(int size, const fftw_codelet_desc *config)
{
fftw_plan_node *p = fftw_make_node();
p->type = config->type;
p->nodeu.notw.size = size;
p->nodeu.notw.codelet = (fftw_notw_codelet *) config->codelet;
p->nodeu.notw.codelet_desc = config;
return p;
}
fftw_plan_node *fftw_make_node_real2hc(int size,
const fftw_codelet_desc *config)
{
fftw_plan_node *p = fftw_make_node();
p->type = config->type;
p->nodeu.real2hc.size = size;
p->nodeu.real2hc.codelet = (fftw_real2hc_codelet *) config->codelet;
p->nodeu.real2hc.codelet_desc = config;
return p;
}
fftw_plan_node *fftw_make_node_hc2real(int size,
const fftw_codelet_desc *config)
{
fftw_plan_node *p = fftw_make_node();
p->type = config->type;
p->nodeu.hc2real.size = size;
p->nodeu.hc2real.codelet = (fftw_hc2real_codelet *) config->codelet;
p->nodeu.hc2real.codelet_desc = config;
return p;
}
fftw_plan_node *fftw_make_node_twiddle(int n,
const fftw_codelet_desc *config,
fftw_plan_node *recurse,
int flags)
{
fftw_plan_node *p = fftw_make_node();
p->type = config->type;
p->nodeu.twiddle.size = config->size;
p->nodeu.twiddle.codelet = (fftw_twiddle_codelet *) config->codelet;
p->nodeu.twiddle.recurse = recurse;
p->nodeu.twiddle.codelet_desc = config;
fftw_use_node(recurse);
if (flags & FFTW_MEASURE)
p->nodeu.twiddle.tw = fftw_create_twiddle(n, config);
else
p->nodeu.twiddle.tw = 0;
return p;
}
fftw_plan_node *fftw_make_node_hc2hc(int n, fftw_direction dir,
const fftw_codelet_desc *config,
fftw_plan_node *recurse,
int flags)
{
fftw_plan_node *p = fftw_make_node();
p->type = config->type;
p->nodeu.hc2hc.size = config->size;
p->nodeu.hc2hc.dir = dir;
p->nodeu.hc2hc.codelet = (fftw_hc2hc_codelet *) config->codelet;
p->nodeu.hc2hc.recurse = recurse;
p->nodeu.hc2hc.codelet_desc = config;
fftw_use_node(recurse);
if (flags & FFTW_MEASURE)
p->nodeu.hc2hc.tw = fftw_create_twiddle(n, config);
else
p->nodeu.hc2hc.tw = 0;
return p;
}
fftw_plan_node *fftw_make_node_generic(int n, int size,
fftw_generic_codelet *codelet,
fftw_plan_node *recurse,
int flags)
{
fftw_plan_node *p = fftw_make_node();
p->type = FFTW_GENERIC;
p->nodeu.generic.size = size;
p->nodeu.generic.codelet = codelet;
p->nodeu.generic.recurse = recurse;
fftw_use_node(recurse);
if (flags & FFTW_MEASURE)
p->nodeu.generic.tw = fftw_create_twiddle(n,
(const fftw_codelet_desc *) 0);
else
p->nodeu.generic.tw = 0;
return p;
}
fftw_plan_node *fftw_make_node_rgeneric(int n, int size,
fftw_direction dir,
fftw_rgeneric_codelet *codelet,
fftw_plan_node *recurse,
int flags)
{
fftw_plan_node *p = fftw_make_node();
if (size % 2 == 0 || (n / size) % 2 == 0)
fftw_die("invalid size for rgeneric codelet\n");
p->type = FFTW_RGENERIC;
p->nodeu.rgeneric.size = size;
p->nodeu.rgeneric.dir = dir;
p->nodeu.rgeneric.codelet = codelet;
p->nodeu.rgeneric.recurse = recurse;
fftw_use_node(recurse);
if (flags & FFTW_MEASURE)
p->nodeu.rgeneric.tw = fftw_create_twiddle(n,
(const fftw_codelet_desc *) 0);
else
p->nodeu.rgeneric.tw = 0;
return p;
}
/*
* Note that these two Rader-related things must go here, rather than
* in rader.c, in order that putils.c (and rplanner.c) won't depend
* upon rader.c.
*/
fftw_rader_data *fftw_rader_top = NULL;
static void fftw_destroy_rader(fftw_rader_data * d)
{
if (d) {
d->refcount--;
if (d->refcount <= 0) {
fftw_rader_data *cur = fftw_rader_top, *prev = NULL;
while (cur && cur != d) {
prev = cur;
cur = cur->next;
}
if (!cur)
fftw_die("invalid Rader data pointer\n");
if (prev)
prev->next = d->next;
else
fftw_rader_top = d->next;
fftw_destroy_plan_internal(d->plan);
fftw_free(d->omega);
fftw_free(d->cdesc);
fftw_free(d);
}
}
}
static void destroy_tree(fftw_plan_node *p)
{
if (p) {
--p->refcnt;
if (p->refcnt == 0) {
switch (p->type) {
case FFTW_NOTW:
case FFTW_REAL2HC:
case FFTW_HC2REAL:
break;
case FFTW_TWIDDLE:
if (p->nodeu.twiddle.tw)
fftw_destroy_twiddle(p->nodeu.twiddle.tw);
destroy_tree(p->nodeu.twiddle.recurse);
break;
case FFTW_HC2HC:
if (p->nodeu.hc2hc.tw)
fftw_destroy_twiddle(p->nodeu.hc2hc.tw);
destroy_tree(p->nodeu.hc2hc.recurse);
break;
case FFTW_GENERIC:
if (p->nodeu.generic.tw)
fftw_destroy_twiddle(p->nodeu.generic.tw);
destroy_tree(p->nodeu.generic.recurse);
break;
case FFTW_RADER:
if (p->nodeu.rader.tw)
fftw_destroy_twiddle(p->nodeu.rader.tw);
if (p->nodeu.rader.rader_data)
fftw_destroy_rader(p->nodeu.rader.rader_data);
destroy_tree(p->nodeu.rader.recurse);
break;
case FFTW_RGENERIC:
if (p->nodeu.rgeneric.tw)
fftw_destroy_twiddle(p->nodeu.rgeneric.tw);
destroy_tree(p->nodeu.rgeneric.recurse);
break;
}
fftw_free(p);
fftw_node_cnt--;
}
}
}
/* create a plan with twiddle factors, and other bells and whistles */
fftw_plan fftw_make_plan(int n, fftw_direction dir,
fftw_plan_node *root, int flags,
enum fftw_node_type wisdom_type,
int wisdom_signature,
fftw_recurse_kind recurse_kind, int vector_size)
{
fftw_plan p = (fftw_plan) fftw_malloc(sizeof(struct fftw_plan_struct));
p->n = n;
p->dir = dir;
p->flags = flags;
fftw_use_node(root);
p->root = root;
p->cost = 0.0;
p->wisdom_type = wisdom_type;
p->wisdom_signature = wisdom_signature;
p->recurse_kind = recurse_kind;
p->vector_size = vector_size;
if (recurse_kind == FFTW_VECTOR_RECURSE && vector_size > 1)
fftw_die("invalid vector-recurse plan attempted\n");
p->next = (fftw_plan) 0;
p->refcnt = 0;
fftw_plan_cnt++;
return p;
}
/*
* complete with twiddle factors (because nodes don't have
* them when FFTW_ESTIMATE is set)
*/
void fftw_complete_twiddle(fftw_plan_node *p, int n)
{
int r;
switch (p->type) {
case FFTW_NOTW:
case FFTW_REAL2HC:
case FFTW_HC2REAL:
break;
case FFTW_TWIDDLE:
r = p->nodeu.twiddle.size;
if (!p->nodeu.twiddle.tw)
p->nodeu.twiddle.tw =
fftw_create_twiddle(n, p->nodeu.twiddle.codelet_desc);
fftw_complete_twiddle(p->nodeu.twiddle.recurse, n / r);
break;
case FFTW_HC2HC:
r = p->nodeu.hc2hc.size;
if (!p->nodeu.hc2hc.tw)
p->nodeu.hc2hc.tw =
fftw_create_twiddle(n, p->nodeu.hc2hc.codelet_desc);
fftw_complete_twiddle(p->nodeu.hc2hc.recurse, n / r);
break;
case FFTW_GENERIC:
r = p->nodeu.generic.size;
if (!p->nodeu.generic.tw)
p->nodeu.generic.tw =
fftw_create_twiddle(n, (const fftw_codelet_desc *) 0);
fftw_complete_twiddle(p->nodeu.generic.recurse, n / r);
break;
case FFTW_RADER:
r = p->nodeu.rader.size;
if (!p->nodeu.rader.tw)
p->nodeu.rader.tw =
fftw_create_twiddle(n, p->nodeu.rader.rader_data->cdesc);
fftw_complete_twiddle(p->nodeu.rader.recurse, n / r);
break;
case FFTW_RGENERIC:
r = p->nodeu.rgeneric.size;
if (!p->nodeu.rgeneric.tw)
p->nodeu.rgeneric.tw =
fftw_create_twiddle(n, (const fftw_codelet_desc *) 0);
fftw_complete_twiddle(p->nodeu.rgeneric.recurse, n / r);
break;
}
}
void fftw_use_plan(fftw_plan p)
{
++p->refcnt;
}
void fftw_destroy_plan_internal(fftw_plan p)
{
--p->refcnt;
if (p->refcnt == 0) {
destroy_tree(p->root);
fftw_plan_cnt--;
fftw_free(p);
}
}
/* end of constructors */
/* management of plan tables */
void fftw_make_empty_table(fftw_plan *table)
{
*table = (fftw_plan) 0;
}
void fftw_insert(fftw_plan *table, fftw_plan this_plan)
{
fftw_use_plan(this_plan);
this_plan->next = *table;
*table = this_plan;
}
fftw_plan fftw_lookup(fftw_plan *table, int n, int flags, int vector_size)
{
fftw_plan p;
for (p = *table; p &&
(p->n != n || p->flags != flags || p->vector_size != vector_size);
p = p->next);
return p;
}
void fftw_destroy_table(fftw_plan *table)
{
fftw_plan p, q;
for (p = *table; p; p = q) {
q = p->next;
fftw_destroy_plan_internal(p);
}
}
double fftw_estimate_node(fftw_plan_node *p)
{
int k;
switch (p->type) {
case FFTW_NOTW:
k = p->nodeu.notw.size;
goto common1;
case FFTW_REAL2HC:
k = p->nodeu.real2hc.size;
goto common1;
case FFTW_HC2REAL:
k = p->nodeu.hc2real.size;
common1:
return 1.0 + 0.1 * (k - NOTW_OPTIMAL_SIZE) *
(k - NOTW_OPTIMAL_SIZE);
case FFTW_TWIDDLE:
k = p->nodeu.twiddle.size;
return 1.0 + 0.1 * (k - TWIDDLE_OPTIMAL_SIZE) *
(k - TWIDDLE_OPTIMAL_SIZE)
+ fftw_estimate_node(p->nodeu.twiddle.recurse);
case FFTW_HC2HC:
k = p->nodeu.hc2hc.size;
return 1.0 + 0.1 * (k - TWIDDLE_OPTIMAL_SIZE) *
(k - TWIDDLE_OPTIMAL_SIZE)
+ fftw_estimate_node(p->nodeu.hc2hc.recurse);
case FFTW_GENERIC:
k = p->nodeu.generic.size;
return 10.0 + k * k
+ fftw_estimate_node(p->nodeu.generic.recurse);
case FFTW_RADER:
k = p->nodeu.rader.size;
return 10.0 + 10 * k
+ fftw_estimate_node(p->nodeu.rader.recurse);
case FFTW_RGENERIC:
k = p->nodeu.rgeneric.size;
return 10.0 + k * k
+ fftw_estimate_node(p->nodeu.rgeneric.recurse);
}
return 1.0E20;
}
/* pick the better of two plans and destroy the other one. */
fftw_plan fftw_pick_better(fftw_plan p1, fftw_plan p2)
{
if (!p1)
return p2;
if (!p2)
return p1;
if (p1->cost > p2->cost) {
fftw_destroy_plan_internal(p1);
return p2;
} else {
fftw_destroy_plan_internal(p2);
return p1;
}
}
/* find the smallest prime factor of n */
int fftw_factor(int n)
{
int r;
/* try 2 */
if ((n & 1) == 0)
return 2;
/* try odd numbers up to sqrt(n) */
for (r = 3; r * r <= n; r += 2)
if (n % r == 0)
return r;
/* n is prime */
return n;
}
static void print_node(FILE *f, fftw_plan_node *p, int indent)
{
if (p) {
switch (p->type) {
case FFTW_NOTW:
fprintf(f, "%*sFFTW_NOTW %d\n", indent, "",
p->nodeu.notw.size);
break;
case FFTW_REAL2HC:
fprintf(f, "%*sFFTW_REAL2HC %d\n", indent, "",
p->nodeu.real2hc.size);
break;
case FFTW_HC2REAL:
fprintf(f, "%*sFFTW_HC2REAL %d\n", indent, "",
p->nodeu.hc2real.size);
break;
case FFTW_TWIDDLE:
fprintf(f, "%*sFFTW_TWIDDLE %d\n", indent, "",
p->nodeu.twiddle.size);
print_node(f, p->nodeu.twiddle.recurse, indent);
break;
case FFTW_HC2HC:
fprintf(f, "%*sFFTW_HC2HC %d\n", indent, "",
p->nodeu.hc2hc.size);
print_node(f, p->nodeu.hc2hc.recurse, indent);
break;
case FFTW_GENERIC:
fprintf(f, "%*sFFTW_GENERIC %d\n", indent, "",
p->nodeu.generic.size);
print_node(f, p->nodeu.generic.recurse, indent);
break;
case FFTW_RADER:
fprintf(f, "%*sFFTW_RADER %d\n", indent, "",
p->nodeu.rader.size);
fprintf(f, "%*splan for size %d convolution:\n",
indent + 4, "", p->nodeu.rader.size - 1);
print_node(f, p->nodeu.rader.rader_data->plan->root,
indent + 6);
print_node(f, p->nodeu.rader.recurse, indent);
break;
case FFTW_RGENERIC:
fprintf(f, "%*sFFTW_RGENERIC %d\n", indent, "",
p->nodeu.rgeneric.size);
print_node(f, p->nodeu.rgeneric.recurse, indent);
break;
}
}
}
void fftw_fprint_plan(FILE *f, fftw_plan p)
{
fprintf(f, "plan: (cost = %e)\n", p->cost);
if (p->recurse_kind == FFTW_VECTOR_RECURSE)
fprintf(f, "(vector recursion)\n");
else if (p->vector_size > 1)
fprintf(f, "(vector-size %d)\n", p->vector_size);
print_node(f, p->root, 0);
}
void fftw_print_plan(fftw_plan p)
{
fftw_fprint_plan(stdout, p);
}
size_t fftw_sizeof_fftw_real(void)
{
return(sizeof(fftw_real));
}