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-rw-r--r--src/fftw3/rdft/hc2hc.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/src/fftw3/rdft/hc2hc.c b/src/fftw3/rdft/hc2hc.c
new file mode 100644
index 0000000..926273c
--- /dev/null
+++ b/src/fftw3/rdft/hc2hc.c
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2003 Matteo Frigo
+ * Copyright (c) 2003 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
+ *
+ */
+
+/* $Id: hc2hc.c,v 1.1 2008/10/17 06:11:29 scuri Exp $ */
+
+/* generic Cooley-Tukey routines */
+#include "rdft.h"
+#include "hc2hc.h"
+
+static void destroy(plan *ego_)
+{
+ plan_hc2hc *ego = (plan_hc2hc *) ego_;
+
+ X(plan_destroy_internal)(ego->cld);
+ X(plan_destroy_internal)(ego->cld0);
+ X(plan_destroy_internal)(ego->cldm);
+ X(stride_destroy)(ego->ios);
+ X(stride_destroy)(ego->vs);
+}
+
+static void awake(plan *ego_, int flg)
+{
+ plan_hc2hc *ego = (plan_hc2hc *) ego_;
+
+ AWAKE(ego->cld, flg);
+ AWAKE(ego->cld0, flg);
+ AWAKE(ego->cldm, flg);
+
+ if (flg) {
+ const tw_instr *tw = ego->slv->desc->tw;
+ X(mktwiddle)(&ego->td, tw, ego->n, ego->r, (ego->m + 1) / 2);
+ /* 0th twiddle is handled by cld0: */
+ ego->W = ego->td->W + X(twiddle_length)(ego->r, tw);
+ } else {
+ X(twiddle_destroy)(&ego->td);
+ ego->W = 0;
+ }
+}
+
+static void print(const plan *ego_, printer *p)
+{
+ const plan_hc2hc *ego = (const plan_hc2hc *) ego_;
+ const solver_hc2hc *slv = ego->slv;
+ const hc2hc_desc *e = slv->desc;
+
+ p->print(p, "(%s-%d/%d%v \"%s\"%(%p%)%(%p%)%(%p%))",
+ slv->nam, ego->r, X(twiddle_length)(ego->r, e->tw),
+ ego->vl, e->nam, ego->cld0, ego->cldm, ego->cld);
+}
+
+#define divides(a, b) (((int)(b) % (int)(a)) == 0)
+
+int X(rdft_hc2hc_applicable)(const solver_hc2hc *ego, const problem *p_)
+{
+ if (RDFTP(p_)) {
+ const problem_rdft *p = (const problem_rdft *) p_;
+ const hc2hc_desc *d = ego->desc;
+ return (1
+ && p->sz->rnk == 1
+ && p->vecsz->rnk <= 1
+ && p->kind[0] == d->genus->kind
+ && divides(d->radix, p->sz->dims[0].n)
+ && d->radix < p->sz->dims[0].n /* avoid inf. loops in cld0 */
+ );
+ }
+ return 0;
+}
+
+
+static const plan_adt padt =
+{
+ X(rdft_solve),
+ awake,
+ print,
+ destroy
+};
+
+plan *X(mkplan_rdft_hc2hc)(const solver_hc2hc *ego,
+ const problem *p_,
+ planner *plnr,
+ const hc2hcadt *adt)
+{
+ plan_hc2hc *pln;
+ plan *cld = 0, *cld0 = 0, *cldm = 0;
+ int n, r, m;
+ problem *cldp = 0, *cld0p = 0, *cldmp = 0;
+ iodim *d;
+ const problem_rdft *p;
+ const hc2hc_desc *e = ego->desc;
+
+ if (!adt->applicable(ego, p_, plnr))
+ return (plan *) 0;
+
+ p = (const problem_rdft *) p_;
+ d = p->sz->dims;
+ n = d[0].n;
+ r = e->radix;
+ m = n / r;
+
+ adt->mkcldrn(ego, p, &cldp, &cld0p, &cldmp);
+
+ cld = X(mkplan_d)(plnr, cldp); cldp = 0;
+ if (!cld) goto nada;
+
+ cld0 = X(mkplan_d)(plnr, cld0p); cld0p = 0;
+ if (!cld0) goto nada;
+
+ cldm = X(mkplan_d)(plnr, cldmp); cldmp = 0;
+ if (!cldm) goto nada;
+
+ A(adt->pln_size >= sizeof(plan_hc2hc));
+ pln = (plan_hc2hc *) X(mkplan_rdft)(adt->pln_size, &padt, adt->apply);
+
+ pln->slv = ego;
+ pln->cld = cld;
+ pln->cld0 = cld0;
+ pln->cldm = cldm;
+ pln->k = ego->k;
+ pln->n = n;
+ pln->r = r;
+ pln->m = m;
+
+ pln->is = d[0].is;
+ pln->os = d[0].os;
+
+ pln->ios = pln->vs = 0;
+ X(tensor_tornk1)(p->vecsz, &pln->vl, &pln->ivs, &pln->ovs);
+ pln->td = 0;
+ adt->finish(pln);
+
+ return &(pln->super.super);
+
+ nada:
+ X(problem_destroy)(cldmp);
+ X(problem_destroy)(cld0p);
+ X(problem_destroy)(cldp);
+ X(plan_destroy_internal)(cldm);
+ X(plan_destroy_internal)(cld0);
+ X(plan_destroy_internal)(cld);
+ return (plan *) 0;
+}
+
+solver *X(mksolver_rdft_hc2hc)(khc2hc k, const hc2hc_desc *desc,
+ const char *nam, const solver_adt *adt)
+{
+ solver_hc2hc *slv;
+
+ slv = MKSOLVER(solver_hc2hc, adt);
+
+ slv->desc = desc;
+ slv->k = k;
+ slv->nam = nam;
+ return &(slv->super);
+}
+
+/* routines to create children are shared by many solvers */
+
+void X(rdft_mkcldrn_dit)(const solver_hc2hc *ego, const problem_rdft *p,
+ problem **cldp, problem **cld0p, problem **cldmp)
+{
+ iodim *d = p->sz->dims;
+ const hc2hc_desc *e = ego->desc;
+ int m = d[0].n / e->radix;
+ int omid = d[0].os * (m/2);
+
+ tensor *null, *radix = X(mktensor_1d)(e->radix, d[0].is, m * d[0].os);
+ tensor *cld_vec = X(tensor_append)(radix, p->vecsz);
+ X(tensor_destroy)(radix);
+ A(p->kind[0] == R2HC);
+
+ *cldp = X(mkproblem_rdft_d)(X(mktensor_1d)(m, e->radix*d[0].is, d[0].os),
+ cld_vec, p->I, p->O, p->kind);
+
+ radix = X(mktensor_1d)(e->radix, m * d[0].os, m * d[0].os);
+ null = X(mktensor_0d)();
+ *cld0p = X(mkproblem_rdft_1)(radix, null, p->O, p->O, R2HC);
+ *cldmp = X(mkproblem_rdft_1)(m%2 ? null : radix, null,
+ p->O + omid, p->O + omid, R2HCII);
+ X(tensor_destroy2)(null, radix);
+}
+
+
+void X(rdft_mkcldrn_dif)(const solver_hc2hc *ego, const problem_rdft *p,
+ problem **cldp, problem **cld0p, problem **cldmp)
+{
+ iodim *d = p->sz->dims;
+ const hc2hc_desc *e = ego->desc;
+ int m = d[0].n / e->radix;
+ int imid = d[0].is * (m/2);
+
+ tensor *null, *radix = X(mktensor_1d)(e->radix, m * d[0].is, d[0].os);
+ tensor *cld_vec = X(tensor_append)(radix, p->vecsz);
+ X(tensor_destroy)(radix);
+ A(p->kind[0] == HC2R);
+
+ *cldp = X(mkproblem_rdft_d)(X(mktensor_1d)(m, d[0].is, e->radix*d[0].os),
+ cld_vec, p->I, p->O, p->kind);
+
+ radix = X(mktensor_1d)(e->radix, m * d[0].is, m * d[0].is);
+ null = X(mktensor_0d)();
+ *cld0p = X(mkproblem_rdft_1)(radix, null, p->I, p->I, HC2R);
+ *cldmp = X(mkproblem_rdft_1)(m%2 ? null : radix, null,
+ p->I + imid, p->I + imid, HC2RIII);
+ X(tensor_destroy2)(null, radix);
+}
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