view Lib/fftw-3.2.1/genfft/gen_r2cb.ml @ 1:e86e9c111b29

Updates stuff that potentially fixes the memory leak and also makes it work on Windows and Linux (Need to test). Still have to fix fftw include for linux in Jucer.

(*
 * Copyright (c) 1997-1999 Massachusetts Institute of Technology
 * Copyright (c) 2003, 2007-8 Matteo Frigo
 * Copyright (c) 2003, 2007-8 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
 *
 *)

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 (CVar rs);
	     make_volatile_stride (CVar csr);
	     make_volatile_stride (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")]),
	 add_constants 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()