diff src/fftw-3.3.5/rdft/nop2.c @ 42:2cd0e3b3e1fd

Current fftw source

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.5/rdft/nop2.c	Tue Oct 18 13:40:26 2016 +0100
@@ -0,0 +1,90 @@
+/*
+ * 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
+ *
+ */
+
+
+/* plans for vrank -infty RDFT2s (nothing to do), as well as in-place
+   rank-0 HC2R.  Note that in-place rank-0 R2HC is *not* a no-op, because
+   we have to set the imaginary parts of the output to zero. */
+
+#include "rdft.h"
+
+static void apply(const plan *ego_, R *r0, R *r1, R *cr, R *ci)
+{
+     UNUSED(ego_);
+     UNUSED(r0);
+     UNUSED(r1);
+     UNUSED(cr);
+     UNUSED(ci);
+}
+
+static int applicable(const solver *ego_, const problem *p_)
+{
+     const problem_rdft2 *p = (const problem_rdft2 *) p_;
+     UNUSED(ego_);
+
+     return(0
+	    /* case 1 : -infty vector rank */
+	    || (p->vecsz->rnk == RNK_MINFTY)
+		 
+	    /* case 2 : rank-0 in-place rdft, except that
+	       R2HC is not a no-op because it sets the imaginary
+	       part to 0 */
+	    || (1
+		&& p->kind != R2HC
+		&& p->sz->rnk == 0
+		&& FINITE_RNK(p->vecsz->rnk)
+		&& (p->r0 == p->cr)
+		&& X(rdft2_inplace_strides)(p, RNK_MINFTY)
+		 ));
+}
+
+static void print(const plan *ego, printer *p)
+{
+     UNUSED(ego);
+     p->print(p, "(rdft2-nop)");
+}
+
+static plan *mkplan(const solver *ego, const problem *p, planner *plnr)
+{
+     static const plan_adt padt = {
+	  X(rdft2_solve), X(null_awake), print, X(plan_null_destroy)
+     };
+     plan_rdft2 *pln;
+
+     UNUSED(plnr);
+
+     if (!applicable(ego, p))
+          return (plan *) 0;
+     pln = MKPLAN_RDFT2(plan_rdft2, &padt, apply);
+     X(ops_zero)(&pln->super.ops);
+
+     return &(pln->super);
+}
+
+static solver *mksolver(void)
+{
+     static const solver_adt sadt = { PROBLEM_RDFT2, mkplan, 0 };
+     return MKSOLVER(solver, &sadt);
+}
+
+void X(rdft2_nop_register)(planner *p)
+{
+     REGISTER_SOLVER(p, mksolver());
+}