diff src/fftw-3.3.8/rdft/direct2.c @ 167:bd3cc4d1df30

Add FFTW 3.3.8 source, and a Linux build

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.8/rdft/direct2.c	Tue Nov 19 14:52:55 2019 +0000
@@ -0,0 +1,171 @@
+/*
+ * 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
+ *
+ */
+
+
+/* direct RDFT2 R2HC/HC2R solver, if we have a codelet */
+
+#include "rdft/rdft.h"
+
+typedef struct {
+     solver super;
+     const kr2c_desc *desc;
+     kr2c k;
+} S;
+
+typedef struct {
+     plan_rdft2 super;
+
+     stride rs, cs;
+     INT vl;
+     INT ivs, ovs;
+     kr2c k;
+     const S *slv;
+     INT ilast;
+} P;
+
+static void apply(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
+{
+     const P *ego = (const P *) ego_;
+     ASSERT_ALIGNED_DOUBLE;
+     ego->k(r0, r1, cr, ci,
+	    ego->rs, ego->cs, ego->cs,
+	    ego->vl, ego->ivs, ego->ovs);
+}
+
+static void apply_r2hc(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
+{
+     const P *ego = (const P *) ego_;
+     INT i, vl = ego->vl, ovs = ego->ovs;
+     ASSERT_ALIGNED_DOUBLE;
+     ego->k(r0, r1, cr, ci,
+	    ego->rs, ego->cs, ego->cs,
+	    vl, ego->ivs, ovs);
+     for (i = 0; i < vl; ++i, ci += ovs)
+	  ci[0] = ci[ego->ilast] = 0;
+}
+
+static void destroy(plan *ego_)
+{
+     P *ego = (P *) ego_;
+     X(stride_destroy)(ego->rs);
+     X(stride_destroy)(ego->cs);
+}
+
+static void print(const plan *ego_, printer *p)
+{
+     const P *ego = (const P *) ego_;
+     const S *s = ego->slv;
+
+     p->print(p, "(rdft2-%s-direct-%D%v \"%s\")", 
+	      X(rdft_kind_str)(s->desc->genus->kind), s->desc->n, 
+	      ego->vl, s->desc->nam);
+}
+
+static int applicable(const solver *ego_, const problem *p_)
+{
+     const S *ego = (const S *) ego_;
+     const kr2c_desc *desc = ego->desc;
+     const problem_rdft2 *p = (const problem_rdft2 *) p_;
+     INT vl;
+     INT ivs, ovs;
+
+     return (
+	  1
+	  && p->sz->rnk == 1
+	  && p->vecsz->rnk <= 1
+	  && p->sz->dims[0].n == desc->n
+	  && p->kind == desc->genus->kind
+
+	  /* check strides etc */
+	  && X(tensor_tornk1)(p->vecsz, &vl, &ivs, &ovs)
+
+	  && (0
+	      /* can operate out-of-place */
+	      || p->r0 != p->cr
+
+	      /*
+	       * can compute one transform in-place, no matter
+	       * what the strides are.
+	       */
+	      || p->vecsz->rnk == 0
+
+	      /* can operate in-place as long as strides are the same */
+	      || X(rdft2_inplace_strides)(p, RNK_MINFTY)
+	       )
+	  );
+}
+
+static plan *mkplan(const solver *ego_, const problem *p_, planner *plnr)
+{
+     const S *ego = (const S *) ego_;
+     P *pln;
+     const problem_rdft2 *p;
+     iodim *d;
+     int r2hc_kindp;
+
+     static const plan_adt padt = {
+	  X(rdft2_solve), X(null_awake), print, destroy
+     };
+
+     UNUSED(plnr);
+
+     if (!applicable(ego_, p_))
+          return (plan *)0;
+
+     p = (const problem_rdft2 *) p_;
+
+     r2hc_kindp = R2HC_KINDP(p->kind);
+     A(r2hc_kindp || HC2R_KINDP(p->kind));
+
+     pln = MKPLAN_RDFT2(P, &padt, p->kind == R2HC ? apply_r2hc : apply);
+
+     d = p->sz->dims;
+
+     pln->k = ego->k;
+
+     pln->rs = X(mkstride)(d->n, r2hc_kindp ? d->is : d->os);
+     pln->cs = X(mkstride)(d->n, r2hc_kindp ? d->os : d->is);
+
+     X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs);
+
+     /* Nyquist freq., if any */
+     pln->ilast = (d->n % 2) ? 0 : (d->n/2) * d->os;
+
+     pln->slv = ego;
+     X(ops_zero)(&pln->super.super.ops);
+     X(ops_madd2)(pln->vl / ego->desc->genus->vl,
+		  &ego->desc->ops,
+		  &pln->super.super.ops);
+     if (p->kind == R2HC)
+	  pln->super.super.ops.other += 2 * pln->vl; /* + 2 stores */
+
+     pln->super.super.could_prune_now_p = 1;
+     return &(pln->super.super);
+}
+
+/* constructor */
+solver *X(mksolver_rdft2_direct)(kr2c k, const kr2c_desc *desc)
+{
+     static const solver_adt sadt = { PROBLEM_RDFT2, mkplan, 0 };
+     S *slv = MKSOLVER(S, &sadt);
+     slv->k = k;
+     slv->desc = desc;
+     return &(slv->super);
+}