Chris@19: (*
Chris@19:  * Copyright (c) 1997-1999 Massachusetts Institute of Technology
Chris@19:  * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@19:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@19:  *
Chris@19:  * This program is free software; you can redistribute it and/or modify
Chris@19:  * it under the terms of the GNU General Public License as published by
Chris@19:  * the Free Software Foundation; either version 2 of the License, or
Chris@19:  * (at your option) any later version.
Chris@19:  *
Chris@19:  * This program is distributed in the hope that it will be useful,
Chris@19:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@19:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@19:  * GNU General Public License for more details.
Chris@19:  *
Chris@19:  * You should have received a copy of the GNU General Public License
Chris@19:  * along with this program; if not, write to the Free Software
Chris@19:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@19:  *
Chris@19:  *)
Chris@19: 
Chris@19: open Util
Chris@19: open Genutil
Chris@19: open C
Chris@19: 
Chris@19: type ditdif = DIT | DIF
Chris@19: let ditdif = ref DIT
Chris@19: 
Chris@19: let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number> [ -dit | -dif ]"
Chris@19: 
Chris@19: let reload_twiddle = ref false
Chris@19: 
Chris@19: let urs = ref Stride_variable
Chris@19: let uvs = ref Stride_variable
Chris@19: let ums = ref Stride_variable
Chris@19: 
Chris@19: let speclist = [
Chris@19:   "-dit",
Chris@19:   Arg.Unit(fun () -> ditdif := DIT),
Chris@19:   " generate a DIT codelet";
Chris@19: 
Chris@19:   "-dif",
Chris@19:   Arg.Unit(fun () -> ditdif := DIF),
Chris@19:   " generate a DIF codelet";
Chris@19: 
Chris@19:   "-reload-twiddle",
Chris@19:   Arg.Unit(fun () -> reload_twiddle := true),
Chris@19:   " do not collect common twiddle factors";
Chris@19: 
Chris@19:   "-with-rs",
Chris@19:   Arg.String(fun x -> urs := arg_to_stride x),
Chris@19:   " specialize for given input stride";
Chris@19: 
Chris@19:   "-with-vs",
Chris@19:   Arg.String(fun x -> uvs := arg_to_stride x),
Chris@19:   " specialize for given vector stride";
Chris@19: 
Chris@19:   "-with-ms",
Chris@19:   Arg.String(fun x -> ums := arg_to_stride x),
Chris@19:   " specialize for given ms"
Chris@19: ]
Chris@19: 
Chris@19: let generate n =
Chris@19:   let rioarray = "x"
Chris@19:   and rs = "rs" and vs = "vs"
Chris@19:   and twarray = "W" 
Chris@19:   and m = "m" and mb = "mb" and me = "me" and ms = "ms" in
Chris@19: 
Chris@19:   let sign = !Genutil.sign 
Chris@19:   and name = !Magic.codelet_name 
Chris@19:   and byvl x = choose_simd x (ctimes (CVar "VL", x)) 
Chris@19:   and bytwvl x = choose_simd x (ctimes (CVar "TWVL", x)) 
Chris@19:   and bytwvl_vl x = choose_simd x (ctimes (CVar "(TWVL/VL)", x)) in
Chris@19:   let ename = expand_name name in
Chris@19: 
Chris@19:   let (bytwiddle, num_twiddles, twdesc) = Twiddle.twiddle_policy 0 true in
Chris@19:   let nt = num_twiddles n in
Chris@19: 
Chris@19:   let svs = either_stride (!uvs) (C.SVar vs)
Chris@19:   and srs = either_stride (!urs) (C.SVar rs) in
Chris@19:   let sms = stride_to_string "ms" !ums in
Chris@19: 
Chris@19:   let byw =
Chris@19:     if !reload_twiddle then
Chris@19:       array n (fun v -> bytwiddle n sign (twiddle_array nt twarray))
Chris@19:     else
Chris@19:       let a = bytwiddle n sign (twiddle_array nt twarray)
Chris@19:       in fun v -> a
Chris@19:   in
Chris@19: 
Chris@19:   let locations = unique_v_array_c n n in
Chris@19: 
Chris@19:   let ioi = 
Chris@19:     locative_v_array_c n n 
Chris@19:       (C.varray_subscript rioarray svs srs) 
Chris@19:       (C.varray_subscript "BUG" svs srs) 
Chris@19:       locations sms
Chris@19:   and ioo = 
Chris@19:     locative_v_array_c n n 
Chris@19:       (C.varray_subscript rioarray svs srs) 
Chris@19:       (C.varray_subscript "BUG" svs srs) 
Chris@19:       locations sms
Chris@19:   in
Chris@19: 
Chris@19:   let lioi = load_v_array_c n n ioi in
Chris@19:   let fft = Trig.dft_via_rdft  in
Chris@19:   let output =
Chris@19:     match !ditdif with
Chris@19:     | DIT -> array n (fun v -> fft sign n (byw v (lioi v)))
Chris@19:     | DIF -> array n (fun v -> byw v (fft sign n (lioi v)))
Chris@19:   in
Chris@19: 
Chris@19:   let odag = store_v_array_c n n ioo (transpose output) in
Chris@19:   let annot = standard_optimizer odag in
Chris@19: 
Chris@19:   let vm = CVar m and vmb = CVar mb and vme = CVar me in
Chris@19: 
Chris@19:   let body = Block (
Chris@19:     [Decl ("INT", m);
Chris@19:      Decl (C.realtypep, rioarray)],
Chris@19:     [Stmt_assign (CVar rioarray,
Chris@19: 		  CVar (if (sign < 0) then "ri" else "ii"));
Chris@19:      For (list_to_comma
Chris@19: 	    [Expr_assign (vm, vmb);
Chris@19: 	     Expr_assign (CVar twarray, 
Chris@19: 			  CPlus [CVar twarray; 
Chris@19: 				 ctimes (vmb, 
Chris@19: 					 bytwvl_vl (Integer nt))])],
Chris@19: 	  Binop (" < ", vm, vme),
Chris@19: 	  list_to_comma 
Chris@19: 	    [Expr_assign (vm, CPlus [vm; byvl (Integer 1)]);
Chris@19: 	     Expr_assign (CVar rioarray, CPlus [CVar rioarray; 
Chris@19: 						byvl (CVar sms)]);
Chris@19: 	     Expr_assign (CVar twarray, CPlus [CVar twarray; 
Chris@19: 					       bytwvl (Integer nt)]);
Chris@19: 	     make_volatile_stride (2*n) (CVar rs);
Chris@19: 	     make_volatile_stride (2*n) (CVar vs)
Chris@19: 	   ],
Chris@19: 	  Asch annot)]) in
Chris@19: 
Chris@19:   let tree = 
Chris@19:     Fcn (("static void"), ename,
Chris@19: 	 [Decl (C.realtypep, "ri");
Chris@19: 	  Decl (C.realtypep, "ii");
Chris@19: 	  Decl (C.constrealtypep, twarray);
Chris@19: 	  Decl (C.stridetype, rs);
Chris@19: 	  Decl (C.stridetype, vs);
Chris@19: 	  Decl ("INT", mb);
Chris@19: 	  Decl ("INT", me);
Chris@19: 	  Decl ("INT", ms)],
Chris@19:          finalize_fcn body)
Chris@19:   in
Chris@19:   let twinstr = 
Chris@19:     Printf.sprintf "static const tw_instr twinstr[] = %s;\n\n" 
Chris@19:       (twinstr_to_string "VL" (twdesc n))
Chris@19: 
Chris@19:   and desc = 
Chris@19:     Printf.sprintf
Chris@19:       "static const ct_desc desc = {%d, %s, twinstr, &GENUS, %s, %s, %s, %s};\n\n"
Chris@19:       n (stringify name) (flops_of tree) 
Chris@19:       (stride_to_solverparm !urs) 
Chris@19:       (stride_to_solverparm !uvs)
Chris@19:       (stride_to_solverparm !ums) 
Chris@19: 
Chris@19:   and register = 
Chris@19:     match !ditdif with
Chris@19:     | DIT -> "X(kdft_ditsq_register)"
Chris@19:     | DIF -> "X(kdft_difsq_register)"
Chris@19:   in
Chris@19:   let init =
Chris@19:     "\n" ^ 
Chris@19:     twinstr ^ 
Chris@19:     desc ^
Chris@19:     (declare_register_fcn name) ^
Chris@19:     (Printf.sprintf "{\n%s(p, %s, &desc);\n}" register ename)
Chris@19:   in
Chris@19: 
Chris@19:   (unparse tree) ^ "\n" ^ init
Chris@19: 
Chris@19: 
Chris@19: let main () =
Chris@19:   begin
Chris@19:     parse (speclist @ Twiddle.speclist) usage;
Chris@19:     print_string (generate (check_size ()));
Chris@19:   end
Chris@19: 
Chris@19: let _ = main()