diff src/fftw-3.3.5/mpi/rdft2-rank-geq2-transposed.c @ 42:2cd0e3b3e1fd

Current fftw source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.5/mpi/rdft2-rank-geq2-transposed.c	Tue Oct 18 13:40:26 2016 +0100
@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 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
+ *
+ */
+
+/* Real-input (r2c) DFTs of rank >= 2, for the case where we are distributed
+   across the first dimension only, and the output is transposed both
+   in data distribution and in ordering (for the first 2 dimensions).
+
+   Conversely, real-output (c2r) DFTs where the input is transposed.
+
+   We don't currently support transposed-input r2c or transposed-output
+   c2r transforms. */
+
+#include "mpi-rdft2.h"
+#include "mpi-transpose.h"
+#include "rdft.h"
+#include "dft.h"
+
+typedef struct {
+     solver super;
+     int preserve_input; /* preserve input even if DESTROY_INPUT was passed */
+} S;
+
+typedef struct {
+     plan_mpi_rdft2 super;
+
+     plan *cld1, *cldt, *cld2;
+     INT vn;
+     int preserve_input;
+} P;
+
+static void apply_r2c(const plan *ego_, R *I, R *O)
+{
+     const P *ego = (const P *) ego_;
+     plan_rdft2 *cld1;
+     plan_dft *cld2;
+     plan_rdft *cldt;
+     
+     /* RDFT2 local dimensions */
+     cld1 = (plan_rdft2 *) ego->cld1;
+     if (ego->preserve_input) {
+	  cld1->apply(ego->cld1, I, I+ego->vn, O, O+1);
+	  I = O;
+     }
+     else
+	  cld1->apply(ego->cld1, I, I+ego->vn, I, I+1);
+
+     /* global transpose */
+     cldt = (plan_rdft *) ego->cldt;
+     cldt->apply(ego->cldt, I, O);
+
+     /* DFT final local dimension */
+     cld2 = (plan_dft *) ego->cld2;
+     cld2->apply(ego->cld2, O, O+1, O, O+1);
+}
+
+static void apply_c2r(const plan *ego_, R *I, R *O)
+{
+     const P *ego = (const P *) ego_;
+     plan_rdft2 *cld1;
+     plan_dft *cld2;
+     plan_rdft *cldt;
+     
+     /* IDFT local dimensions */
+     cld2 = (plan_dft *) ego->cld2;
+     if (ego->preserve_input) {
+	  cld2->apply(ego->cld2, I+1, I, O+1, O);
+	  I = O;
+     }
+     else
+	  cld2->apply(ego->cld2, I+1, I, I+1, I);
+
+     /* global transpose */
+     cldt = (plan_rdft *) ego->cldt;
+     cldt->apply(ego->cldt, I, O);
+
+     /* RDFT2 final local dimension */
+     cld1 = (plan_rdft2 *) ego->cld1;
+     cld1->apply(ego->cld1, O, O+ego->vn, O, O+1);
+}
+
+static int applicable(const S *ego, const problem *p_,
+		      const planner *plnr)
+{
+     const problem_mpi_rdft2 *p = (const problem_mpi_rdft2 *) p_;
+     return (1
+	     && p->sz->rnk > 1
+	     && (!ego->preserve_input || (!NO_DESTROY_INPUTP(plnr)
+					  && p->I != p->O))
+	     && ((p->flags == TRANSPOSED_OUT && p->kind == R2HC
+		  && XM(is_local_after)(1, p->sz, IB)
+		  && XM(is_local_after)(2, p->sz, OB)
+		  && XM(num_blocks)(p->sz->dims[0].n, 
+				    p->sz->dims[0].b[OB]) == 1)
+		 || 
+		 (p->flags == TRANSPOSED_IN && p->kind == HC2R
+		  && XM(is_local_after)(1, p->sz, OB)
+		  && XM(is_local_after)(2, p->sz, IB)
+		  && XM(num_blocks)(p->sz->dims[0].n, 
+				    p->sz->dims[0].b[IB]) == 1))
+	     && (!NO_SLOWP(plnr) /* slow if rdft2-serial is applicable */
+		 || !XM(rdft2_serial_applicable)(p))
+	  );
+}
+
+static void awake(plan *ego_, enum wakefulness wakefulness)
+{
+     P *ego = (P *) ego_;
+     X(plan_awake)(ego->cld1, wakefulness);
+     X(plan_awake)(ego->cldt, wakefulness);
+     X(plan_awake)(ego->cld2, wakefulness);
+}
+
+static void destroy(plan *ego_)
+{
+     P *ego = (P *) ego_;
+     X(plan_destroy_internal)(ego->cld2);
+     X(plan_destroy_internal)(ego->cldt);
+     X(plan_destroy_internal)(ego->cld1);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+     const P *ego = (const P *) ego_;
+     p->print(p, "(mpi-rdft2-rank-geq2-transposed%s%(%p%)%(%p%)%(%p%))", 
+	      ego->preserve_input==2 ?"/p":"",
+	      ego->cld1, ego->cldt, ego->cld2);
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+     const S *ego = (const S *) ego_;
+     const problem_mpi_rdft2 *p;
+     P *pln;
+     plan *cld1 = 0, *cldt = 0, *cld2 = 0;
+     R *r0, *r1, *cr, *ci, *ri, *ii, *ro, *io, *I, *O;
+     tensor *sz;
+     int i, my_pe, n_pes;
+     INT nrest, n1, b1;
+     static const plan_adt padt = {
+          XM(rdft2_solve), awake, print, destroy
+     };
+     block_kind k1, k2;
+
+     UNUSED(ego);
+
+     if (!applicable(ego, p_, plnr))
+          return (plan *) 0;
+
+     p = (const problem_mpi_rdft2 *) p_;
+
+     I = p->I; O = p->O;
+     if (p->kind == R2HC) {
+	  k1 = IB; k2 = OB;
+          r1 = (r0 = I) + p->vn;
+	  if (ego->preserve_input || NO_DESTROY_INPUTP(plnr)) {
+	       ci = (cr = O) + 1;
+	       I = O; 
+	  }
+	  else 
+	       ci = (cr = I) + 1;
+	  io = ii = (ro = ri = O) + 1;
+     }
+     else {
+	  k1 = OB; k2 = IB;
+	  r1 = (r0 = O) + p->vn;
+	  ci = (cr = O) + 1;
+	  if (ego->preserve_input || NO_DESTROY_INPUTP(plnr)) {
+	       ri = (ii = I) + 1;
+	       ro = (io = O) + 1;
+	       I = O;
+	  }
+	  else
+	       ro = ri = (io = ii = I) + 1;
+     }
+
+     MPI_Comm_rank(p->comm, &my_pe);
+     MPI_Comm_size(p->comm, &n_pes);
+
+     sz = X(mktensor)(p->sz->rnk - 1); /* tensor of last rnk-1 dimensions */
+     i = p->sz->rnk - 2; A(i >= 0);
+     sz->dims[i].n = p->sz->dims[i+1].n / 2 + 1;
+     sz->dims[i].is = sz->dims[i].os = 2 * p->vn;
+     for (--i; i >= 0; --i) {
+	  sz->dims[i].n = p->sz->dims[i+1].n;
+	  sz->dims[i].is = sz->dims[i].os = sz->dims[i+1].n * sz->dims[i+1].is;
+     }
+     nrest = 1; for (i = 1; i < sz->rnk; ++i) nrest *= sz->dims[i].n;
+     {
+	  INT ivs = 1 + (p->kind == HC2R), ovs = 1 + (p->kind == R2HC);
+          INT is = sz->dims[0].n * sz->dims[0].is;
+          INT b = XM(block)(p->sz->dims[0].n, p->sz->dims[0].b[k1], my_pe);
+	  sz->dims[p->sz->rnk - 2].n = p->sz->dims[p->sz->rnk - 1].n;
+	  cld1 = X(mkplan_d)(plnr,
+                             X(mkproblem_rdft2_d)(sz,
+						  X(mktensor_2d)(b, is, is,
+								p->vn,ivs,ovs),
+						  r0, r1, cr, ci, p->kind));
+	  if (XM(any_true)(!cld1, p->comm)) goto nada;
+     }
+
+     nrest *= p->vn;
+     n1 = p->sz->dims[1].n;
+     b1 = p->sz->dims[1].b[k2];
+     if (p->sz->rnk == 2) { /* n1 dimension is cut in ~half */
+	  n1 = n1 / 2 + 1;
+	  b1 = b1 == p->sz->dims[1].n ? n1 : b1;
+     }
+
+     if (p->kind == R2HC)
+	  cldt = X(mkplan_d)(plnr,
+			     XM(mkproblem_transpose)(
+				  p->sz->dims[0].n, n1, nrest * 2,
+				  I, O,
+				  p->sz->dims[0].b[IB], b1,
+				  p->comm, 0));
+     else
+	  cldt = X(mkplan_d)(plnr,
+			     XM(mkproblem_transpose)(
+				  n1, p->sz->dims[0].n, nrest * 2,
+				  I, O,
+				  b1, p->sz->dims[0].b[OB], 
+				  p->comm, 0));
+     if (XM(any_true)(!cldt, p->comm)) goto nada;
+
+     {
+	  INT is = p->sz->dims[0].n * nrest * 2;
+	  INT b = XM(block)(n1, b1, my_pe);
+	  cld2 = X(mkplan_d)(plnr,
+			     X(mkproblem_dft_d)(X(mktensor_1d)(
+						     p->sz->dims[0].n,
+						     nrest * 2, nrest * 2),
+						X(mktensor_2d)(b, is, is,
+							       nrest, 2, 2),
+						ri, ii, ro, io));
+	  if (XM(any_true)(!cld2, p->comm)) goto nada;
+     }
+
+     pln = MKPLAN_MPI_RDFT2(P, &padt, p->kind == R2HC ? apply_r2c : apply_c2r);
+     pln->cld1 = cld1;
+     pln->cldt = cldt;
+     pln->cld2 = cld2;
+     pln->preserve_input = ego->preserve_input ? 2 : NO_DESTROY_INPUTP(plnr);
+     pln->vn = p->vn;
+
+     X(ops_add)(&cld1->ops, &cld2->ops, &pln->super.super.ops);
+     X(ops_add2)(&cldt->ops, &pln->super.super.ops);
+
+     return &(pln->super.super);
+
+ nada:
+     X(plan_destroy_internal)(cld2);
+     X(plan_destroy_internal)(cldt);
+     X(plan_destroy_internal)(cld1);
+     return (plan *) 0;
+}
+
+static solver *mksolver(int preserve_input)
+{
+     static const solver_adt sadt = { PROBLEM_MPI_RDFT2, mkplan, 0 };
+     S *slv = MKSOLVER(S, &sadt);
+     slv->preserve_input = preserve_input;
+     return &(slv->super);
+}
+
+void XM(rdft2_rank_geq2_transposed_register)(planner *p)
+{
+     int preserve_input;
+     for (preserve_input = 0; preserve_input <= 1; ++preserve_input)
+	  REGISTER_SOLVER(p, mksolver(preserve_input));
+}