view Lib/fftw-3.2.1/api/.svn/text-base/mapflags.c.svn-base @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

/*
 * Copyright (c) 2003, 2007-8 Matteo Frigo
 * Copyright (c) 2003, 2007-8 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
 *
 */

#include "api.h"
#include <math.h>

/* a flag operation: x is either a flag, in which case xm == 0, or
   a mask, in which case xm == x; using this we can compactly code
   the various bit operations via (flags & x) ^ xm or (flags | x) ^ xm. */
typedef struct {
     unsigned x, xm;
} flagmask;

typedef struct {
     flagmask flag;
     flagmask op;
} flagop;

#define FLAGP(f, msk)(((f) & (msk).x) ^ (msk).xm)
#define OP(f, msk)(((f) | (msk).x) ^ (msk).xm)

#define YES(x) {x, 0}
#define NO(x) {x, x}
#define IMPLIES(predicate, consequence) { predicate, consequence }
#define EQV(a, b) IMPLIES(YES(a), YES(b)), IMPLIES(NO(a), NO(b))
#define NEQV(a, b) IMPLIES(YES(a), NO(b)), IMPLIES(NO(a), YES(b))

static void map_flags(unsigned *iflags, unsigned *oflags,
		      const flagop flagmap[], int nmap)
{
     int i;
     for (i = 0; i < nmap; ++i)
          if (FLAGP(*iflags, flagmap[i].flag))
               *oflags = OP(*oflags, flagmap[i].op);
}

/* encoding of the planner timelimit into a BITS_FOR_TIMELIMIT-bits
   nonnegative integer, such that we can still view the integer as
   ``impatience'': higher means *lower* time limit, and 0 is the
   highest possible value (about 1 year of calendar time) */
static unsigned timelimit_to_flags(double timelimit)
{
     const double tmax = 365 * 24 * 3600;
     const double tstep = 1.05;
     const int nsteps = (1 << BITS_FOR_TIMELIMIT);
     int x;
     
     if (timelimit >= tmax)
	  return 0;
     if (timelimit <= 1.0e-10)
	  return nsteps - 1;
     
     x = (int) (0.5 + (log(tmax / timelimit) / log(tstep)));

     if (x < 0) x = 0;
     if (x >= nsteps) x = nsteps - 1;
     return x;
}

void X(mapflags)(planner *plnr, unsigned flags)
{
     unsigned l, u, t;

     /* map of api flags -> api flags, to implement consistency rules
        and combination flags */
     const flagop self_flagmap[] = {
	  /* in some cases (notably for halfcomplex->real transforms),
	     DESTROY_INPUT is the default, so we need to support
	     an inverse flag to disable it.

	     (PRESERVE, DESTROY)   ->   (PRESERVE, DESTROY)
               (0, 0)                       (1, 0)
               (0, 1)                       (0, 1)
               (1, 0)                       (1, 0)
               (1, 1)                       (1, 0)
	  */
	  IMPLIES(YES(FFTW_PRESERVE_INPUT), NO(FFTW_DESTROY_INPUT)),
	  IMPLIES(NO(FFTW_DESTROY_INPUT), YES(FFTW_PRESERVE_INPUT)),

	  IMPLIES(YES(FFTW_EXHAUSTIVE), YES(FFTW_PATIENT)),

	  IMPLIES(YES(FFTW_ESTIMATE), NO(FFTW_PATIENT)),
	  IMPLIES(YES(FFTW_ESTIMATE),
		  YES(FFTW_ESTIMATE_PATIENT 
		      | FFTW_NO_INDIRECT_OP
		      | FFTW_ALLOW_PRUNING)),

	  IMPLIES(NO(FFTW_EXHAUSTIVE), 
		  YES(FFTW_NO_SLOW)),

	  /* a canonical set of fftw2-like impatience flags */
	  IMPLIES(NO(FFTW_PATIENT),
		  YES(FFTW_NO_VRECURSE
		      | FFTW_NO_RANK_SPLITS
		      | FFTW_NO_VRANK_SPLITS
		      | FFTW_NO_NONTHREADED
		      | FFTW_NO_DFT_R2HC
		      | FFTW_NO_FIXED_RADIX_LARGE_N
		      | FFTW_BELIEVE_PCOST))
     };

     /* map of (processed) api flags to internal problem/planner flags */
     const flagop l_flagmap[] = {
	  EQV(FFTW_PRESERVE_INPUT, NO_DESTROY_INPUT),
	  EQV(FFTW_NO_SIMD, NO_SIMD),
	  EQV(FFTW_CONSERVE_MEMORY, CONSERVE_MEMORY),
	  EQV(FFTW_NO_BUFFERING, NO_BUFFERING),
	  NEQV(FFTW_ALLOW_LARGE_GENERIC, NO_LARGE_GENERIC)
     };

     const flagop u_flagmap[] = {
	  IMPLIES(YES(FFTW_EXHAUSTIVE), NO(0xFFFFFFFF)),
	  IMPLIES(NO(FFTW_EXHAUSTIVE), YES(NO_UGLY)),

	  /* the following are undocumented, "beyond-guru" flags that
	     require some understanding of FFTW internals */
	  EQV(FFTW_ESTIMATE_PATIENT, ESTIMATE),
	  EQV(FFTW_ALLOW_PRUNING, ALLOW_PRUNING),
	  EQV(FFTW_BELIEVE_PCOST, BELIEVE_PCOST),
	  EQV(FFTW_NO_DFT_R2HC, NO_DFT_R2HC),
	  EQV(FFTW_NO_NONTHREADED, NO_NONTHREADED),
	  EQV(FFTW_NO_INDIRECT_OP, NO_INDIRECT_OP),
	  EQV(FFTW_NO_RANK_SPLITS, NO_RANK_SPLITS),
	  EQV(FFTW_NO_VRANK_SPLITS, NO_VRANK_SPLITS),
	  EQV(FFTW_NO_VRECURSE, NO_VRECURSE),
	  EQV(FFTW_NO_SLOW, NO_SLOW),
	  EQV(FFTW_NO_FIXED_RADIX_LARGE_N, NO_FIXED_RADIX_LARGE_N)
     };

     map_flags(&flags, &flags, self_flagmap, NELEM(self_flagmap));

     l = u = 0;
     map_flags(&flags, &l, l_flagmap, NELEM(l_flagmap));
     map_flags(&flags, &u, u_flagmap, NELEM(u_flagmap));

     /* enforce l <= u  */
     PLNR_L(plnr) = l;
     PLNR_U(plnr) = u | l;

     /* assert that the conversion didn't lose bits */
     A(PLNR_L(plnr) == l);
     A(PLNR_U(plnr) == (u | l));

     /* compute flags representation of the timelimit */
     t = timelimit_to_flags(plnr->timelimit);

     PLNR_TIMELIMIT_IMPATIENCE(plnr) = t;
     A(PLNR_TIMELIMIT_IMPATIENCE(plnr) == t);
}