cannam@167: (*
cannam@167:  * Copyright (c) 1997-1999 Massachusetts Institute of Technology
cannam@167:  * Copyright (c) 2003, 2007-14 Matteo Frigo
cannam@167:  * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
cannam@167:  *
cannam@167:  * This program is free software; you can redistribute it and/or modify
cannam@167:  * it under the terms of the GNU General Public License as published by
cannam@167:  * the Free Software Foundation; either version 2 of the License, or
cannam@167:  * (at your option) any later version.
cannam@167:  *
cannam@167:  * This program is distributed in the hope that it will be useful,
cannam@167:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@167:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@167:  * GNU General Public License for more details.
cannam@167:  *
cannam@167:  * You should have received a copy of the GNU General Public License
cannam@167:  * along with this program; if not, write to the Free Software
cannam@167:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@167:  *
cannam@167:  *)
cannam@167: 
cannam@167: open Util
cannam@167: open Genutil
cannam@167: open C
cannam@167: 
cannam@167: type ditdif = DIT | DIF
cannam@167: let ditdif = ref DIT
cannam@167: 
cannam@167: let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number> [ -dit | -dif ]"
cannam@167: 
cannam@167: let reload_twiddle = ref false
cannam@167: 
cannam@167: let urs = ref Stride_variable
cannam@167: let uvs = ref Stride_variable
cannam@167: let ums = ref Stride_variable
cannam@167: 
cannam@167: let speclist = [
cannam@167:   "-dit",
cannam@167:   Arg.Unit(fun () -> ditdif := DIT),
cannam@167:   " generate a DIT codelet";
cannam@167: 
cannam@167:   "-dif",
cannam@167:   Arg.Unit(fun () -> ditdif := DIF),
cannam@167:   " generate a DIF codelet";
cannam@167: 
cannam@167:   "-reload-twiddle",
cannam@167:   Arg.Unit(fun () -> reload_twiddle := true),
cannam@167:   " do not collect common twiddle factors";
cannam@167: 
cannam@167:   "-with-rs",
cannam@167:   Arg.String(fun x -> urs := arg_to_stride x),
cannam@167:   " specialize for given input stride";
cannam@167: 
cannam@167:   "-with-vs",
cannam@167:   Arg.String(fun x -> uvs := arg_to_stride x),
cannam@167:   " specialize for given vector stride";
cannam@167: 
cannam@167:   "-with-ms",
cannam@167:   Arg.String(fun x -> ums := arg_to_stride x),
cannam@167:   " specialize for given ms"
cannam@167: ]
cannam@167: 
cannam@167: let generate n =
cannam@167:   let rioarray = "x"
cannam@167:   and rs = "rs" and vs = "vs"
cannam@167:   and twarray = "W" 
cannam@167:   and m = "m" and mb = "mb" and me = "me" and ms = "ms" in
cannam@167: 
cannam@167:   let sign = !Genutil.sign 
cannam@167:   and name = !Magic.codelet_name 
cannam@167:   and byvl x = choose_simd x (ctimes (CVar "VL", x)) 
cannam@167:   and bytwvl x = choose_simd x (ctimes (CVar "TWVL", x)) 
cannam@167:   and bytwvl_vl x = choose_simd x (ctimes (CVar "(TWVL/VL)", x)) in
cannam@167:   let ename = expand_name name in
cannam@167: 
cannam@167:   let (bytwiddle, num_twiddles, twdesc) = Twiddle.twiddle_policy 0 true in
cannam@167:   let nt = num_twiddles n in
cannam@167: 
cannam@167:   let svs = either_stride (!uvs) (C.SVar vs)
cannam@167:   and srs = either_stride (!urs) (C.SVar rs) in
cannam@167:   let sms = stride_to_string "ms" !ums in
cannam@167: 
cannam@167:   let byw =
cannam@167:     if !reload_twiddle then
cannam@167:       array n (fun v -> bytwiddle n sign (twiddle_array nt twarray))
cannam@167:     else
cannam@167:       let a = bytwiddle n sign (twiddle_array nt twarray)
cannam@167:       in fun v -> a
cannam@167:   in
cannam@167: 
cannam@167:   let locations = unique_v_array_c n n in
cannam@167: 
cannam@167:   let ioi = 
cannam@167:     locative_v_array_c n n 
cannam@167:       (C.varray_subscript rioarray svs srs) 
cannam@167:       (C.varray_subscript "BUG" svs srs) 
cannam@167:       locations sms
cannam@167:   and ioo = 
cannam@167:     locative_v_array_c n n 
cannam@167:       (C.varray_subscript rioarray svs srs) 
cannam@167:       (C.varray_subscript "BUG" svs srs) 
cannam@167:       locations sms
cannam@167:   in
cannam@167: 
cannam@167:   let lioi = load_v_array_c n n ioi in
cannam@167:   let fft = Trig.dft_via_rdft  in
cannam@167:   let output =
cannam@167:     match !ditdif with
cannam@167:     | DIT -> array n (fun v -> fft sign n (byw v (lioi v)))
cannam@167:     | DIF -> array n (fun v -> byw v (fft sign n (lioi v)))
cannam@167:   in
cannam@167: 
cannam@167:   let odag = store_v_array_c n n ioo (transpose output) in
cannam@167:   let annot = standard_optimizer odag in
cannam@167: 
cannam@167:   let vm = CVar m and vmb = CVar mb and vme = CVar me in
cannam@167: 
cannam@167:   let body = Block (
cannam@167:     [Decl ("INT", m);
cannam@167:      Decl (C.realtypep, rioarray)],
cannam@167:     [Stmt_assign (CVar rioarray,
cannam@167: 		  CVar (if (sign < 0) then "ri" else "ii"));
cannam@167:      For (list_to_comma
cannam@167: 	    [Expr_assign (vm, vmb);
cannam@167: 	     Expr_assign (CVar twarray, 
cannam@167: 			  CPlus [CVar twarray; 
cannam@167: 				 ctimes (vmb, 
cannam@167: 					 bytwvl_vl (Integer nt))])],
cannam@167: 	  Binop (" < ", vm, vme),
cannam@167: 	  list_to_comma 
cannam@167: 	    [Expr_assign (vm, CPlus [vm; byvl (Integer 1)]);
cannam@167: 	     Expr_assign (CVar rioarray, CPlus [CVar rioarray; 
cannam@167: 						byvl (CVar sms)]);
cannam@167: 	     Expr_assign (CVar twarray, CPlus [CVar twarray; 
cannam@167: 					       bytwvl (Integer nt)]);
cannam@167: 	     make_volatile_stride (2*n) (CVar rs);
cannam@167: 	     make_volatile_stride (2*n) (CVar vs)
cannam@167: 	   ],
cannam@167: 	  Asch annot)]) in
cannam@167: 
cannam@167:   let tree = 
cannam@167:     Fcn (("static void"), ename,
cannam@167: 	 [Decl (C.realtypep, "ri");
cannam@167: 	  Decl (C.realtypep, "ii");
cannam@167: 	  Decl (C.constrealtypep, twarray);
cannam@167: 	  Decl (C.stridetype, rs);
cannam@167: 	  Decl (C.stridetype, vs);
cannam@167: 	  Decl ("INT", mb);
cannam@167: 	  Decl ("INT", me);
cannam@167: 	  Decl ("INT", ms)],
cannam@167:          finalize_fcn body)
cannam@167:   in
cannam@167:   let twinstr = 
cannam@167:     Printf.sprintf "static const tw_instr twinstr[] = %s;\n\n" 
cannam@167:       (twinstr_to_string "VL" (twdesc n))
cannam@167: 
cannam@167:   and desc = 
cannam@167:     Printf.sprintf
cannam@167:       "static const ct_desc desc = {%d, %s, twinstr, &GENUS, %s, %s, %s, %s};\n\n"
cannam@167:       n (stringify name) (flops_of tree) 
cannam@167:       (stride_to_solverparm !urs) 
cannam@167:       (stride_to_solverparm !uvs)
cannam@167:       (stride_to_solverparm !ums) 
cannam@167: 
cannam@167:   and register = 
cannam@167:     match !ditdif with
cannam@167:     | DIT -> "X(kdft_ditsq_register)"
cannam@167:     | DIF -> "X(kdft_difsq_register)"
cannam@167:   in
cannam@167:   let init =
cannam@167:     "\n" ^ 
cannam@167:     twinstr ^ 
cannam@167:     desc ^
cannam@167:     (declare_register_fcn name) ^
cannam@167:     (Printf.sprintf "{\n%s(p, %s, &desc);\n}" register ename)
cannam@167:   in
cannam@167: 
cannam@167:   (unparse tree) ^ "\n" ^ init
cannam@167: 
cannam@167: 
cannam@167: let main () =
cannam@167:   begin
cannam@167:     parse (speclist @ Twiddle.speclist) usage;
cannam@167:     print_string (generate (check_size ()));
cannam@167:   end
cannam@167: 
cannam@167: let _ = main()