comparison src/fftw-3.3.3/api/apiplan.c @ 10:37bf6b4a2645

Add FFTW3

+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 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 "api.h"
+
+static plan *mkplan0(planner *plnr, unsigned flags, 
+		     const problem *prb, int hash_info, 
+		     wisdom_state_t wisdom_state)
+{
+     /* map API flags into FFTW flags */
+     X(mapflags)(plnr, flags);
+
+     plnr->flags.hash_info = hash_info;
+     plnr->wisdom_state = wisdom_state;
+
+     /* create plan */
+     return plnr->adt->mkplan(plnr, prb);
+}
+
+static unsigned force_estimator(unsigned flags)
+{
+     flags &= ~(FFTW_MEASURE | FFTW_PATIENT | FFTW_EXHAUSTIVE);
+     return (flags | FFTW_ESTIMATE);
+}
+
+static plan *mkplan(planner *plnr, unsigned flags, 
+		    const problem *prb, int hash_info)
+{
+     plan *pln;
+
+     pln = mkplan0(plnr, flags, prb, hash_info, WISDOM_NORMAL);
+
+     if (plnr->wisdom_state == WISDOM_NORMAL && !pln) {
+	  /* maybe the planner failed because of inconsistent wisdom;
+	     plan again ignoring infeasible wisdom */
+	  pln = mkplan0(plnr, force_estimator(flags), prb, 
+			hash_info, WISDOM_IGNORE_INFEASIBLE);
+     }
+
+     if (plnr->wisdom_state == WISDOM_IS_BOGUS) {
+	  /* if the planner detected a wisdom inconsistency,
+	     forget all wisdom and plan again */
+	  plnr->adt->forget(plnr, FORGET_EVERYTHING);
+
+	  A(!pln);
+	  pln = mkplan0(plnr, flags, prb, hash_info, WISDOM_NORMAL);
+
+	  if (plnr->wisdom_state == WISDOM_IS_BOGUS) {
+	       /* if it still fails, plan without wisdom */
+	       plnr->adt->forget(plnr, FORGET_EVERYTHING);
+
+	       A(!pln);
+	       pln = mkplan0(plnr, force_estimator(flags), 
+			     prb, hash_info, WISDOM_IGNORE_ALL);
+	  }
+     }
+
+     return pln;
+}
+
+apiplan *X(mkapiplan)(int sign, unsigned flags, problem *prb)
+{
+     apiplan *p = 0;
+     plan *pln;
+     unsigned flags_used_for_planning;
+     planner *plnr = X(the_planner)();
+     unsigned int pats[] = {FFTW_ESTIMATE, FFTW_MEASURE,
+			    FFTW_PATIENT, FFTW_EXHAUSTIVE};
+     int pat, pat_max;
+     double pcost = 0;
+
+     if (flags & FFTW_WISDOM_ONLY) {
+	  /* Special mode that returns a plan only if wisdom is present,
+	     and returns 0 otherwise.  This is now documented in the manual,
+	     as a way to detect whether wisdom is available for a problem. */
+	  flags_used_for_planning = flags;
+	  pln = mkplan0(plnr, flags, prb, 0, WISDOM_ONLY);
+     } else {
+	  pat_max = flags & FFTW_ESTIMATE ? 0 :
+	       (flags & FFTW_EXHAUSTIVE ? 3 :
+		(flags & FFTW_PATIENT ? 2 : 1));
+	  pat = plnr->timelimit >= 0 ? 0 : pat_max;
+
+	  flags &= ~(FFTW_ESTIMATE | FFTW_MEASURE | 
+		     FFTW_PATIENT | FFTW_EXHAUSTIVE);
+
+	  plnr->start_time = X(get_crude_time)();
+	  
+	  /* plan at incrementally increasing patience until we run
+	     out of time */
+	  for (pln = 0, flags_used_for_planning = 0; pat <= pat_max; ++pat) {
+	       plan *pln1;
+	       unsigned tmpflags = flags | pats[pat];
+	       pln1 = mkplan(plnr, tmpflags, prb, 0);
+
+	       if (!pln1) {
+		    /* don't bother continuing if planner failed or timed out */
+		    A(!pln || plnr->timed_out);
+		    break;
+	       }
+
+	       X(plan_destroy_internal)(pln);
+	       pln = pln1;
+	       flags_used_for_planning = tmpflags;
+	       pcost = pln->pcost;
+	  }
+     }
+
+     if (pln) {
+	  /* build apiplan */
+	  p = (apiplan *) MALLOC(sizeof(apiplan), PLANS);
+	  p->prb = prb;
+	  p->sign = sign; /* cache for execute_dft */
+	  
+	  /* re-create plan from wisdom, adding blessing */
+	  p->pln = mkplan(plnr, flags_used_for_planning, prb, BLESSING);
+
+	  /* record pcost from most recent measurement for use in X(cost) */
+	  p->pln->pcost = pcost;
+
+	  if (sizeof(trigreal) > sizeof(R)) {
+	       /* this is probably faster, and we have enough trigreal
+		  bits to maintain accuracy */
+	       X(plan_awake)(p->pln, AWAKE_SQRTN_TABLE);
+	  } else {
+	       /* more accurate */
+	       X(plan_awake)(p->pln, AWAKE_SINCOS);
+	  }
+	  
+	  /* we don't use pln for p->pln, above, since by re-creating the
+	     plan we might use more patient wisdom from a timed-out mkplan */
+	  X(plan_destroy_internal)(pln);
+     } else
+	  X(problem_destroy)(prb);
+     
+     /* discard all information not necessary to reconstruct the plan */
+     plnr->adt->forget(plnr, FORGET_ACCURSED);
+
+#ifdef FFTW_RANDOM_ESTIMATOR
+     X(random_estimate_seed)++; /* subsequent "random" plans are distinct */
+#endif
+     
+     return p;
+}
+
+void X(destroy_plan)(X(plan) p)
+{
+     if (p) {
+          X(plan_awake)(p->pln, SLEEPY);
+          X(plan_destroy_internal)(p->pln);
+          X(problem_destroy)(p->prb);
+          X(ifree)(p);
+     }
+}