Chris@10: /*
Chris@10:  * Copyright (c) 2003, 2007-11 Matteo Frigo
Chris@10:  * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
Chris@10:  *
Chris@10:  * This program is free software; you can redistribute it and/or modify
Chris@10:  * it under the terms of the GNU General Public License as published by
Chris@10:  * the Free Software Foundation; either version 2 of the License, or
Chris@10:  * (at your option) any later version.
Chris@10:  *
Chris@10:  * This program is distributed in the hope that it will be useful,
Chris@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@10:  * GNU General Public License for more details.
Chris@10:  *
Chris@10:  * You should have received a copy of the GNU General Public License
Chris@10:  * along with this program; if not, write to the Free Software
Chris@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@10:  *
Chris@10:  */
Chris@10: 
Chris@10: 
Chris@10: #include "rdft.h"
Chris@10: 
Chris@10: typedef struct {
Chris@10:      solver super;
Chris@10:      int maxnbuf_ndx;
Chris@10: } S;
Chris@10: 
Chris@10: static const INT maxnbufs[] = { 8, 256 };
Chris@10: 
Chris@10: typedef struct {
Chris@10:      plan_rdft super;
Chris@10: 
Chris@10:      plan *cld, *cldcpy, *cldrest;
Chris@10:      INT n, vl, nbuf, bufdist;
Chris@10:      INT ivs_by_nbuf, ovs_by_nbuf;
Chris@10: } P;
Chris@10: 
Chris@10: /* transform a vector input with the help of bufs */
Chris@10: static void apply(const plan *ego_, R *I, R *O)
Chris@10: {
Chris@10:      const P *ego = (const P *) ego_;
Chris@10:      plan_rdft *cld = (plan_rdft *) ego->cld;
Chris@10:      plan_rdft *cldcpy = (plan_rdft *) ego->cldcpy;
Chris@10:      plan_rdft *cldrest;
Chris@10:      INT i, vl = ego->vl, nbuf = ego->nbuf;
Chris@10:      INT ivs_by_nbuf = ego->ivs_by_nbuf, ovs_by_nbuf = ego->ovs_by_nbuf;
Chris@10:      R *bufs;
Chris@10: 
Chris@10:      bufs = (R *)MALLOC(sizeof(R) * nbuf * ego->bufdist, BUFFERS);
Chris@10: 
Chris@10:      for (i = nbuf; i <= vl; i += nbuf) {
Chris@10:           /* transform to bufs: */
Chris@10:           cld->apply((plan *) cld, I, bufs);
Chris@10: 	  I += ivs_by_nbuf;
Chris@10: 
Chris@10:           /* copy back */
Chris@10:           cldcpy->apply((plan *) cldcpy, bufs, O);
Chris@10: 	  O += ovs_by_nbuf;
Chris@10:      }
Chris@10: 
Chris@10:      X(ifree)(bufs);
Chris@10: 
Chris@10:      /* Do the remaining transforms, if any: */
Chris@10:      cldrest = (plan_rdft *) ego->cldrest;
Chris@10:      cldrest->apply((plan *) cldrest, I, O);
Chris@10: }
Chris@10: 
Chris@10: /* for hc2r problems, copy the input into buffer, and then
Chris@10:    transform buffer->output, which allows for destruction of the
Chris@10:    buffer */
Chris@10: static void apply_hc2r(const plan *ego_, R *I, R *O)
Chris@10: {
Chris@10:      const P *ego = (const P *) ego_;
Chris@10:      plan_rdft *cld = (plan_rdft *) ego->cld;
Chris@10:      plan_rdft *cldcpy = (plan_rdft *) ego->cldcpy;
Chris@10:      plan_rdft *cldrest;
Chris@10:      INT i, vl = ego->vl, nbuf = ego->nbuf;
Chris@10:      INT ivs_by_nbuf = ego->ivs_by_nbuf, ovs_by_nbuf = ego->ovs_by_nbuf;
Chris@10:      R *bufs;
Chris@10: 
Chris@10:      bufs = (R *)MALLOC(sizeof(R) * nbuf * ego->bufdist, BUFFERS);
Chris@10: 
Chris@10:      for (i = nbuf; i <= vl; i += nbuf) {
Chris@10:           /* copy input into bufs: */
Chris@10:           cldcpy->apply((plan *) cldcpy, I, bufs);
Chris@10: 	  I += ivs_by_nbuf;
Chris@10: 
Chris@10:           /* transform to output */
Chris@10:           cld->apply((plan *) cld, bufs, O);
Chris@10: 	  O += ovs_by_nbuf;
Chris@10:      }
Chris@10: 
Chris@10:      X(ifree)(bufs);
Chris@10: 
Chris@10:      /* Do the remaining transforms, if any: */
Chris@10:      cldrest = (plan_rdft *) ego->cldrest;
Chris@10:      cldrest->apply((plan *) cldrest, I, O);
Chris@10: }
Chris@10: 
Chris@10: 
Chris@10: static void awake(plan *ego_, enum wakefulness wakefulness)
Chris@10: {
Chris@10:      P *ego = (P *) ego_;
Chris@10: 
Chris@10:      X(plan_awake)(ego->cld, wakefulness);
Chris@10:      X(plan_awake)(ego->cldcpy, wakefulness);
Chris@10:      X(plan_awake)(ego->cldrest, wakefulness);
Chris@10: }
Chris@10: 
Chris@10: static void destroy(plan *ego_)
Chris@10: {
Chris@10:      P *ego = (P *) ego_;
Chris@10:      X(plan_destroy_internal)(ego->cldrest);
Chris@10:      X(plan_destroy_internal)(ego->cldcpy);
Chris@10:      X(plan_destroy_internal)(ego->cld);
Chris@10: }
Chris@10: 
Chris@10: static void print(const plan *ego_, printer *p)
Chris@10: {
Chris@10:      const P *ego = (const P *) ego_;
Chris@10:      p->print(p, "(rdft-buffered-%D%v/%D-%D%(%p%)%(%p%)%(%p%))",
Chris@10:               ego->n, ego->nbuf,
Chris@10:               ego->vl, ego->bufdist % ego->n,
Chris@10:               ego->cld, ego->cldcpy, ego->cldrest);
Chris@10: }
Chris@10: 
Chris@10: static int applicable0(const S *ego, const problem *p_, const planner *plnr)
Chris@10: {
Chris@10:      const problem_rdft *p = (const problem_rdft *) p_;
Chris@10:      iodim *d = p->sz->dims;
Chris@10: 
Chris@10:      if (1
Chris@10: 	 && p->vecsz->rnk <= 1
Chris@10: 	 && p->sz->rnk == 1
Chris@10: 	  ) {
Chris@10: 	  INT vl, ivs, ovs;
Chris@10: 	  X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs);
Chris@10: 
Chris@10: 	  if (X(toobig)(d[0].n) && CONSERVE_MEMORYP(plnr))
Chris@10: 	       return 0;
Chris@10: 
Chris@10: 	  /* if this solver is redundant, in the sense that a solver
Chris@10: 	     of lower index generates the same plan, then prune this
Chris@10: 	     solver */
Chris@10: 	  if (X(nbuf_redundant)(d[0].n, vl,
Chris@10: 				ego->maxnbuf_ndx,
Chris@10: 				maxnbufs, NELEM(maxnbufs)))
Chris@10: 	       return 0;
Chris@10: 
Chris@10: 	  if (p->I != p->O) {
Chris@10: 	       if (p->kind[0] == HC2R) {
Chris@10: 		    /* Allow HC2R problems only if the input is to be
Chris@10: 		       preserved.  This solver sets NO_DESTROY_INPUT,
Chris@10: 		       which prevents infinite loops */
Chris@10: 		    return (NO_DESTROY_INPUTP(plnr));
Chris@10: 	       } else {
Chris@10: 		    /*
Chris@10: 		      In principle, the buffered transforms might be useful
Chris@10: 		      when working out of place.  However, in order to
Chris@10: 		      prevent infinite loops in the planner, we require
Chris@10: 		      that the output stride of the buffered transforms be
Chris@10: 		      greater than 1.
Chris@10: 		    */
Chris@10: 		    return (d[0].os > 1);
Chris@10: 	       }
Chris@10: 	  }
Chris@10: 
Chris@10: 	  /*
Chris@10: 	   * If the problem is in place, the input/output strides must
Chris@10: 	   * be the same or the whole thing must fit in the buffer.
Chris@10: 	   */
Chris@10: 	  if (X(tensor_inplace_strides2)(p->sz, p->vecsz))
Chris@10: 	       return 1;
Chris@10: 
Chris@10: 	  if (/* fits into buffer: */
Chris@10: 	       ((p->vecsz->rnk == 0)
Chris@10: 		||
Chris@10: 		(X(nbuf)(d[0].n, p->vecsz->dims[0].n, 
Chris@10: 			 maxnbufs[ego->maxnbuf_ndx]) 
Chris@10: 		 == p->vecsz->dims[0].n)))
Chris@10: 	       return 1;
Chris@10:      }
Chris@10: 
Chris@10:      return 0;
Chris@10: }
Chris@10: 
Chris@10: static int applicable(const S *ego, const problem *p_, const planner *plnr)
Chris@10: {
Chris@10:      const problem_rdft *p;
Chris@10: 
Chris@10:      if (NO_BUFFERINGP(plnr)) return 0;
Chris@10: 
Chris@10:      if (!applicable0(ego, p_, plnr)) return 0;
Chris@10: 
Chris@10:      p = (const problem_rdft *) p_;
Chris@10:      if (p->kind[0] == HC2R) {
Chris@10: 	  if (NO_UGLYP(plnr)) {
Chris@10: 	       /* UGLY if in-place and too big, since the problem
Chris@10: 		  could be solved via transpositions */
Chris@10: 	       if (p->I == p->O && X(toobig)(p->sz->dims[0].n)) 
Chris@10: 		    return 0;
Chris@10: 	  }
Chris@10:      } else {
Chris@10: 	  if (NO_UGLYP(plnr)) {
Chris@10: 	       if (p->I != p->O) return 0;
Chris@10: 	       if (X(toobig)(p->sz->dims[0].n)) return 0;
Chris@10: 	  }
Chris@10:      }
Chris@10:      return 1;
Chris@10: }
Chris@10: 
Chris@10: static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
Chris@10: {
Chris@10:      P *pln;
Chris@10:      const S *ego = (const S *)ego_;
Chris@10:      plan *cld = (plan *) 0;
Chris@10:      plan *cldcpy = (plan *) 0;
Chris@10:      plan *cldrest = (plan *) 0;
Chris@10:      const problem_rdft *p = (const problem_rdft *) p_;
Chris@10:      R *bufs = (R *) 0;
Chris@10:      INT nbuf = 0, bufdist, n, vl;
Chris@10:      INT ivs, ovs;
Chris@10:      int hc2rp;
Chris@10: 
Chris@10:      static const plan_adt padt = {
Chris@10: 	  X(rdft_solve), awake, print, destroy
Chris@10:      };
Chris@10: 
Chris@10:      if (!applicable(ego, p_, plnr))
Chris@10:           goto nada;
Chris@10: 
Chris@10:      n = X(tensor_sz)(p->sz);
Chris@10:      X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs);
Chris@10:      hc2rp = (p->kind[0] == HC2R);
Chris@10: 
Chris@10:      nbuf = X(nbuf)(n, vl, maxnbufs[ego->maxnbuf_ndx]);
Chris@10:      bufdist = X(bufdist)(n, vl);
Chris@10:      A(nbuf > 0);
Chris@10: 
Chris@10:      /* initial allocation for the purpose of planning */
Chris@10:      bufs = (R *) MALLOC(sizeof(R) * nbuf * bufdist, BUFFERS);
Chris@10: 
Chris@10:      if (hc2rp) {
Chris@10: 	  /* allow destruction of buffer */
Chris@10: 	  cld = X(mkplan_f_d)(plnr, 
Chris@10: 			      X(mkproblem_rdft_d)(
Chris@10: 				   X(mktensor_1d)(n, 1, p->sz->dims[0].os),
Chris@10: 				   X(mktensor_1d)(nbuf, bufdist, ovs),
Chris@10: 				   bufs, TAINT(p->O, ovs * nbuf), p->kind),
Chris@10: 			      0, 0, NO_DESTROY_INPUT);
Chris@10: 	  if (!cld) goto nada;
Chris@10: 
Chris@10: 	  /* copying input into buffer buffer is a rank-0 transform: */
Chris@10: 	  cldcpy = X(mkplan_d)(plnr, 
Chris@10: 			       X(mkproblem_rdft_0_d)(
Chris@10: 				    X(mktensor_2d)(nbuf, ivs, bufdist,
Chris@10: 						   n, p->sz->dims[0].is, 1),
Chris@10: 				    TAINT(p->I, ivs * nbuf), bufs));
Chris@10: 	  if (!cldcpy) goto nada;
Chris@10:      } else {
Chris@10: 	  /* allow destruction of input if problem is in place */
Chris@10: 	  cld = X(mkplan_f_d)(plnr, 
Chris@10: 			      X(mkproblem_rdft_d)(
Chris@10: 				   X(mktensor_1d)(n, p->sz->dims[0].is, 1),
Chris@10: 				   X(mktensor_1d)(nbuf, ivs, bufdist),
Chris@10: 				   TAINT(p->I, ivs * nbuf), bufs, p->kind),
Chris@10: 			      0, 0, (p->I == p->O) ? NO_DESTROY_INPUT : 0);
Chris@10: 	  if (!cld) goto nada;
Chris@10: 
Chris@10: 	  /* copying back from the buffer is a rank-0 transform: */
Chris@10: 	  cldcpy = X(mkplan_d)(plnr, 
Chris@10: 			       X(mkproblem_rdft_0_d)(
Chris@10: 				    X(mktensor_2d)(nbuf, bufdist, ovs,
Chris@10: 						   n, 1, p->sz->dims[0].os),
Chris@10: 				    bufs, TAINT(p->O, ovs * nbuf)));
Chris@10: 	  if (!cldcpy) goto nada;
Chris@10:      }
Chris@10: 
Chris@10:      /* deallocate buffers, let apply() allocate them for real */
Chris@10:      X(ifree)(bufs);
Chris@10:      bufs = 0;
Chris@10: 
Chris@10:      /* plan the leftover transforms (cldrest): */
Chris@10:      {
Chris@10: 	  INT id = ivs * (nbuf * (vl / nbuf));
Chris@10: 	  INT od = ovs * (nbuf * (vl / nbuf));
Chris@10: 	  cldrest = X(mkplan_d)(plnr, 
Chris@10: 				X(mkproblem_rdft_d)(
Chris@10: 				     X(tensor_copy)(p->sz),
Chris@10: 				     X(mktensor_1d)(vl % nbuf, ivs, ovs),
Chris@10: 				     p->I + id, p->O + od, p->kind));
Chris@10:      }
Chris@10:      if (!cldrest) goto nada;
Chris@10: 
Chris@10:      pln = MKPLAN_RDFT(P, &padt, hc2rp ? apply_hc2r : apply);
Chris@10:      pln->cld = cld;
Chris@10:      pln->cldcpy = cldcpy;
Chris@10:      pln->cldrest = cldrest;
Chris@10:      pln->n = n;
Chris@10:      pln->vl = vl;
Chris@10:      pln->ivs_by_nbuf = ivs * nbuf;
Chris@10:      pln->ovs_by_nbuf = ovs * nbuf;
Chris@10: 
Chris@10:      pln->nbuf = nbuf;
Chris@10:      pln->bufdist = bufdist;
Chris@10: 
Chris@10:      {
Chris@10: 	  opcnt t;
Chris@10: 	  X(ops_add)(&cld->ops, &cldcpy->ops, &t);
Chris@10: 	  X(ops_madd)(vl / nbuf, &t, &cldrest->ops, &pln->super.super.ops);
Chris@10:      }
Chris@10: 
Chris@10:      return &(pln->super.super);
Chris@10: 
Chris@10:  nada:
Chris@10:      X(ifree0)(bufs);
Chris@10:      X(plan_destroy_internal)(cldrest);
Chris@10:      X(plan_destroy_internal)(cldcpy);
Chris@10:      X(plan_destroy_internal)(cld);
Chris@10:      return (plan *) 0;
Chris@10: }
Chris@10: 
Chris@10: static solver *mksolver(int maxnbuf_ndx)
Chris@10: {
Chris@10:      static const solver_adt sadt = { PROBLEM_RDFT, mkplan, 0 };
Chris@10:      S *slv = MKSOLVER(S, &sadt);
Chris@10:      slv->maxnbuf_ndx = maxnbuf_ndx;
Chris@10:      return &(slv->super);
Chris@10: }
Chris@10: 
Chris@10: void X(rdft_buffered_register)(planner *p)
Chris@10: {
Chris@10:      size_t i;
Chris@10:      for (i = 0; i < NELEM(maxnbufs); ++i)
Chris@10: 	  REGISTER_SOLVER(p, mksolver(i));
Chris@10: }