view Lib/fftw-3.2.1/genfft/gen_twiddle_c.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


type ditdif = DIT | DIF
let ditdif = ref DIT
let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number> [ -dit | -dif ]"

let urs = ref Stride_variable
let ums = ref Stride_variable

let speclist = [
  "-dit",
  Arg.Unit(fun () -> ditdif := DIT),
  " generate a DIT codelet";

  "-dif",
  Arg.Unit(fun () -> ditdif := DIF),
  " generate a DIF codelet";

  "-with-rs",
  Arg.String(fun x -> urs := arg_to_stride x),
  " specialize for given i/o stride";

  "-with-ms",
  Arg.String(fun x -> ums := arg_to_stride x),
  " specialize for given ms"
]

let generate n =
  let rioarray = "x"
  and rs = "rs"
  and twarray = "W"
  and m = "m" and mb = "mb" and me = "me" and ms = "ms" in

  let sign = !Genutil.sign 
  and name = !Magic.codelet_name 
  and byvl x = choose_simd x (ctimes (CVar "VL", x)) 
  and bytwvl x = choose_simd x (ctimes (CVar "TWVL", x))
  and bytwvl_vl x = choose_simd x (ctimes (CVar "(TWVL/VL)", x)) in
  let ename = expand_name name in

  let (bytwiddle, num_twiddles, twdesc) = Twiddle.twiddle_policy 0 true in
  let nt = num_twiddles n in

  let byw = bytwiddle n sign (twiddle_array nt twarray) in

  let vrs = either_stride (!urs) (C.SVar rs) in
  let sms = stride_to_string "ms" !ums in

  let locations = unique_array_c n in
  let iloc = 
    locative_array_c n 
      (C.array_subscript rioarray vrs)
      (C.array_subscript "BUG" vrs)
      locations sms
  and oloc = 
    locative_array_c n 
      (C.array_subscript rioarray vrs)
      (C.array_subscript "BUG" vrs)
      locations sms
  in
  let liloc = load_array_r n iloc in
  let fft = Trig.dft_via_rdft  in
  let output =
    match !ditdif with
    | DIT -> array n (fft sign n (byw liloc))
    | DIF -> array n (byw (fft sign n liloc))
  in
  let odag = store_array_r n oloc output in
  let annot = standard_optimizer odag in

  let vm = CVar m and vmb = CVar mb and vme = CVar me in

  let body = Block (
    [Decl ("INT", m);
     Decl (C.realtypep, rioarray)],
    [Stmt_assign (CVar rioarray,
		  CVar (if (sign < 0) then "ri" else "ii"));
     For (list_to_comma
	    [Expr_assign (vm, vmb);
	     Expr_assign (CVar twarray, 
			  CPlus [CVar twarray; 
				 ctimes (vmb, 
					 bytwvl_vl (Integer nt))])],
	  Binop (" < ", vm, vme),
	  list_to_comma 
	    [Expr_assign (vm, CPlus [vm; byvl (Integer 1)]);
	     Expr_assign (CVar rioarray, CPlus [CVar rioarray; 
						byvl (CVar sms)]);
	     Expr_assign (CVar twarray, CPlus [CVar twarray; 
					       bytwvl (Integer nt)]);
	     make_volatile_stride (CVar rs)
	    ],
	  Asch annot)])
  in

  let tree = 
    Fcn (((if !Magic.standalone then "" else "static ") ^ "void"),
	 ename,
	 [Decl (C.realtypep, "ri");
	  Decl (C.realtypep, "ii");
	  Decl (C.constrealtypep, twarray);
	  Decl (C.stridetype, rs);
	  Decl ("INT", mb);
	  Decl ("INT", me);
	  Decl ("INT", ms)],
         add_constants body)
  in
  let twinstr = 
    Printf.sprintf "static const tw_instr twinstr[] = %s;\n\n" 
      (twinstr_to_string "VL" (twdesc n))
  and desc = 
    Printf.sprintf
      "static const ct_desc desc = {%d, %s, twinstr, &GENUS, %s, %s, %s, %s};\n\n"
      n (stringify name) (flops_of tree) 
      (stride_to_solverparm !urs) "0"
      (stride_to_solverparm !ums) 
  and register = 
    match !ditdif with
    | DIT -> "X(kdft_dit_register)"
    | DIF -> "X(kdft_dif_register)"

  in
  let init =
    "\n" ^
    twinstr ^ 
    desc ^
    (declare_register_fcn name) ^
    (Printf.sprintf "{\n%s(p, %s, &desc);\n}" register ename)
  in

  (unparse tree) ^ "\n" ^ (if !Magic.standalone then "" else init)


let main () =
  begin 
    Simdmagic.simd_mode := true;
    parse (speclist @ Twiddle.speclist) usage;
    print_string (generate (check_size ()));
  end

let _ = main()