diff src/fftw-3.3.3/genfft/gen_r2cb.ml @ 10:37bf6b4a2645

Add FFTW3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.3/genfft/gen_r2cb.ml	Wed Mar 20 15:35:50 2013 +0000
@@ -0,0 +1,167 @@
+(*
+ * Copyright (c) 1997-1999 Massachusetts Institute of Technology
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 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
+ *
+ *)
+
+open Util
+open Genutil
+open C
+
+
+let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number>"
+
+let urs = ref Stride_variable
+let ucsr = ref Stride_variable
+let ucsi = ref Stride_variable
+let uivs = ref Stride_variable
+let uovs = ref Stride_variable
+let dftIII_flag = ref false
+
+let speclist = [
+  "-with-rs",
+  Arg.String(fun x -> urs := arg_to_stride x),
+  " specialize for given real-array stride";
+
+  "-with-csr",
+  Arg.String(fun x -> ucsr := arg_to_stride x),
+  " specialize for given complex-array real stride";
+
+  "-with-csi",
+  Arg.String(fun x -> ucsi := arg_to_stride x),
+  " specialize for given complex-array imaginary stride";
+
+  "-with-ivs",
+  Arg.String(fun x -> uivs := arg_to_stride x),
+  " specialize for given input vector stride";
+
+  "-with-ovs",
+  Arg.String(fun x -> uovs := arg_to_stride x),
+  " specialize for given output vector stride";
+
+  "-dft-III",
+  Arg.Unit(fun () -> dftIII_flag := true),
+  " produce shifted dftIII-style codelets"
+] 
+
+let hcdftIII sign n input =
+  let input' i =
+    if (i mod 2 == 0) then
+      Complex.zero
+    else
+      let i' = (i - 1) / 2 in
+      if (2 * i' < n - 1) then (input i')
+      else if (2 * i' == n - 1) then 
+	Complex.real (input i')
+      else 
+	Complex.conj (input (n - 1 - i')) 
+  in Fft.dft sign (2 * n) input'
+
+let generate n =
+  let ar0 = "R0" and ar1 = "R1" and acr = "Cr" and aci = "Ci"
+  and rs = "rs" and csr = "csr" and csi = "csi" 
+  and i = "i" and v = "v"
+  and transform = if !dftIII_flag then hcdftIII else Trig.hdft
+  in
+
+  let sign = !Genutil.sign 
+  and name = !Magic.codelet_name in
+
+  let vrs = either_stride (!urs) (C.SVar rs)
+  and vcsr = either_stride (!ucsr) (C.SVar csr)
+  and vcsi = either_stride (!ucsi) (C.SVar csi)
+  in
+
+  let sovs = stride_to_string "ovs" !uovs in
+  let sivs = stride_to_string "ivs" !uivs in
+
+  let locations = unique_array_c n in
+  let input = 
+    locative_array_c n 
+      (C.array_subscript acr vcsr)
+      (C.array_subscript aci vcsi)
+      locations sivs in
+  let output = transform sign n (load_array_hc n input) in
+  let oloce = 
+    locative_array_c n 
+      (C.array_subscript ar0 vrs)
+      (C.array_subscript "BUG" vrs)
+      locations sovs
+  and oloco = 
+    locative_array_c n 
+      (C.array_subscript ar1 vrs)
+      (C.array_subscript "BUG" vrs)
+      locations sovs in
+  let oloc i = if i mod 2 == 0 then oloce (i/2) else oloco ((i-1)/2) in
+  let odag = store_array_r n oloc output in
+  let annot = standard_optimizer odag in
+
+  let body = Block (
+    [Decl ("INT", i)],
+    [For (Expr_assign (CVar i, CVar v),
+	  Binop (" > ", CVar i, Integer 0),
+	  list_to_comma 
+	    [Expr_assign (CVar i, CPlus [CVar i; CUminus (Integer 1)]);
+	     Expr_assign (CVar ar0, CPlus [CVar ar0; CVar sovs]);
+	     Expr_assign (CVar ar1, CPlus [CVar ar1; CVar sovs]);
+	     Expr_assign (CVar acr, CPlus [CVar acr; CVar sivs]);
+	     Expr_assign (CVar aci, CPlus [CVar aci; CVar sivs]);
+	     make_volatile_stride (4*n) (CVar rs);
+	     make_volatile_stride (4*n) (CVar csr);
+	     make_volatile_stride (4*n) (CVar csi)
+	   ],
+	  Asch annot)
+   ])
+  in
+
+  let tree =
+    Fcn ((if !Magic.standalone then "void" else "static void"), name,
+	 ([Decl (C.realtypep, ar0);
+	   Decl (C.realtypep, ar1);
+	   Decl (C.realtypep, acr);
+	   Decl (C.realtypep, aci);
+	   Decl (C.stridetype, rs);
+	   Decl (C.stridetype, csr);
+	   Decl (C.stridetype, csi);
+	   Decl ("INT", v);
+	   Decl ("INT", "ivs");
+	   Decl ("INT", "ovs")]),
+	 finalize_fcn body)
+
+  in let desc = 
+    Printf.sprintf 
+      "static const kr2c_desc desc = { %d, \"%s\", %s, &GENUS };\n\n"
+      n name (flops_of tree) 
+
+  and init =
+    (declare_register_fcn name) ^
+    "{" ^
+    "  X(kr2c_register)(p, " ^ name ^ ", &desc);\n" ^
+    "}\n"
+
+  in
+  (unparse tree) ^ "\n" ^ (if !Magic.standalone then "" else desc ^ init)
+
+
+let main () =
+  begin
+    parse speclist usage;
+    print_string (generate (check_size ()));
+  end
+
+let _ = main()