annotate fft/fftw/fftw-3.3.4/genfft/gen_twidsq.ml @ 40:223f770b5341 kissfft-double tip

Try a double-precision kissfft
author Chris Cannam
date Wed, 07 Sep 2016 10:40:32 +0100
parents 26056e866c29
children
rev   line source
Chris@19 1 (*
Chris@19 2 * Copyright (c) 1997-1999 Massachusetts Institute of Technology
Chris@19 3 * Copyright (c) 2003, 2007-14 Matteo Frigo
Chris@19 4 * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
Chris@19 5 *
Chris@19 6 * This program is free software; you can redistribute it and/or modify
Chris@19 7 * it under the terms of the GNU General Public License as published by
Chris@19 8 * the Free Software Foundation; either version 2 of the License, or
Chris@19 9 * (at your option) any later version.
Chris@19 10 *
Chris@19 11 * This program is distributed in the hope that it will be useful,
Chris@19 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@19 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Chris@19 14 * GNU General Public License for more details.
Chris@19 15 *
Chris@19 16 * You should have received a copy of the GNU General Public License
Chris@19 17 * along with this program; if not, write to the Free Software
Chris@19 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Chris@19 19 *
Chris@19 20 *)
Chris@19 21
Chris@19 22 open Util
Chris@19 23 open Genutil
Chris@19 24 open C
Chris@19 25
Chris@19 26 type ditdif = DIT | DIF
Chris@19 27 let ditdif = ref DIT
Chris@19 28
Chris@19 29 let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number> [ -dit | -dif ]"
Chris@19 30
Chris@19 31 let reload_twiddle = ref false
Chris@19 32
Chris@19 33 let urs = ref Stride_variable
Chris@19 34 let uvs = ref Stride_variable
Chris@19 35 let ums = ref Stride_variable
Chris@19 36
Chris@19 37 let speclist = [
Chris@19 38 "-dit",
Chris@19 39 Arg.Unit(fun () -> ditdif := DIT),
Chris@19 40 " generate a DIT codelet";
Chris@19 41
Chris@19 42 "-dif",
Chris@19 43 Arg.Unit(fun () -> ditdif := DIF),
Chris@19 44 " generate a DIF codelet";
Chris@19 45
Chris@19 46 "-reload-twiddle",
Chris@19 47 Arg.Unit(fun () -> reload_twiddle := true),
Chris@19 48 " do not collect common twiddle factors";
Chris@19 49
Chris@19 50 "-with-rs",
Chris@19 51 Arg.String(fun x -> urs := arg_to_stride x),
Chris@19 52 " specialize for given input stride";
Chris@19 53
Chris@19 54 "-with-vs",
Chris@19 55 Arg.String(fun x -> uvs := arg_to_stride x),
Chris@19 56 " specialize for given vector stride";
Chris@19 57
Chris@19 58 "-with-ms",
Chris@19 59 Arg.String(fun x -> ums := arg_to_stride x),
Chris@19 60 " specialize for given ms"
Chris@19 61 ]
Chris@19 62
Chris@19 63 let generate n =
Chris@19 64 let rioarray = "rio"
Chris@19 65 and iioarray = "iio"
Chris@19 66 and rs = "rs" and vs = "vs"
Chris@19 67 and twarray = "W"
Chris@19 68 and m = "m" and mb = "mb" and me = "me" and ms = "ms" in
Chris@19 69
Chris@19 70 let sign = !Genutil.sign
Chris@19 71 and name = !Magic.codelet_name in
Chris@19 72
Chris@19 73 let (bytwiddle, num_twiddles, twdesc) = Twiddle.twiddle_policy 0 false in
Chris@19 74 let nt = num_twiddles n in
Chris@19 75
Chris@19 76 let svs = either_stride (!uvs) (C.SVar vs)
Chris@19 77 and srs = either_stride (!urs) (C.SVar rs) in
Chris@19 78
Chris@19 79 let byw =
Chris@19 80 if !reload_twiddle then
Chris@19 81 array n (fun v -> bytwiddle n sign (twiddle_array nt twarray))
Chris@19 82 else
Chris@19 83 let a = bytwiddle n sign (twiddle_array nt twarray)
Chris@19 84 in fun v -> a
Chris@19 85 in
Chris@19 86
Chris@19 87 let locations = unique_v_array_c n n in
Chris@19 88
Chris@19 89 let ioi =
Chris@19 90 locative_v_array_c n n
Chris@19 91 (C.varray_subscript rioarray svs srs)
Chris@19 92 (C.varray_subscript iioarray svs srs)
Chris@19 93 locations "BUG"
Chris@19 94 and ioo =
Chris@19 95 locative_v_array_c n n
Chris@19 96 (C.varray_subscript rioarray svs srs)
Chris@19 97 (C.varray_subscript iioarray svs srs)
Chris@19 98 locations "BUG"
Chris@19 99 in
Chris@19 100
Chris@19 101 let lioi = load_v_array_c n n ioi in
Chris@19 102 let output =
Chris@19 103 match !ditdif with
Chris@19 104 | DIT -> array n (fun v -> Fft.dft sign n (byw v (lioi v)))
Chris@19 105 | DIF -> array n (fun v -> byw v (Fft.dft sign n (lioi v)))
Chris@19 106 in
Chris@19 107
Chris@19 108 let odag = store_v_array_c n n ioo (transpose output) in
Chris@19 109 let annot = standard_optimizer odag in
Chris@19 110
Chris@19 111 let vm = CVar m and vmb = CVar mb and vme = CVar me in
Chris@19 112
Chris@19 113 let body = Block (
Chris@19 114 [Decl ("INT", m)],
Chris@19 115 [For (list_to_comma
Chris@19 116 [Expr_assign (vm, vmb);
Chris@19 117 Expr_assign (CVar twarray,
Chris@19 118 CPlus [CVar twarray;
Chris@19 119 ctimes (vmb, Integer nt)])],
Chris@19 120 Binop (" < ", vm, vme),
Chris@19 121 list_to_comma
Chris@19 122 [Expr_assign (vm, CPlus [vm; Integer 1]);
Chris@19 123 Expr_assign (CVar rioarray, CPlus [CVar rioarray; CVar ms]);
Chris@19 124 Expr_assign (CVar iioarray, CPlus [CVar iioarray; CVar ms]);
Chris@19 125 Expr_assign (CVar twarray, CPlus [CVar twarray; Integer nt]);
Chris@19 126 make_volatile_stride (2*n) (CVar rs);
Chris@19 127 make_volatile_stride (2*0) (CVar vs)
Chris@19 128 ],
Chris@19 129 Asch annot)]) in
Chris@19 130
Chris@19 131 let tree =
Chris@19 132 Fcn (("static void"), name,
Chris@19 133 [Decl (C.realtypep, rioarray);
Chris@19 134 Decl (C.realtypep, iioarray);
Chris@19 135 Decl (C.constrealtypep, twarray);
Chris@19 136 Decl (C.stridetype, rs);
Chris@19 137 Decl (C.stridetype, vs);
Chris@19 138 Decl ("INT", mb);
Chris@19 139 Decl ("INT", me);
Chris@19 140 Decl ("INT", ms)],
Chris@19 141 finalize_fcn body)
Chris@19 142 in
Chris@19 143 let twinstr =
Chris@19 144 Printf.sprintf "static const tw_instr twinstr[] = %s;\n\n"
Chris@19 145 (Twiddle.twinstr_to_c_string (twdesc n))
Chris@19 146
Chris@19 147 and desc =
Chris@19 148 Printf.sprintf
Chris@19 149 "static const ct_desc desc = {%d, \"%s\", twinstr, &GENUS, %s, %s, %s, %s};\n\n"
Chris@19 150 n name (flops_of tree)
Chris@19 151 (stride_to_solverparm !urs) (stride_to_solverparm !uvs)
Chris@19 152 (stride_to_solverparm !ums)
Chris@19 153
Chris@19 154 and register =
Chris@19 155 match !ditdif with
Chris@19 156 | DIT -> "X(kdft_ditsq_register)"
Chris@19 157 | DIF -> "X(kdft_difsq_register)"
Chris@19 158 in
Chris@19 159 let init =
Chris@19 160 "\n" ^
Chris@19 161 twinstr ^
Chris@19 162 desc ^
Chris@19 163 (declare_register_fcn name) ^
Chris@19 164 (Printf.sprintf "{\n%s(p, %s, &desc);\n}" register name)
Chris@19 165 in
Chris@19 166
Chris@19 167 (unparse tree) ^ "\n" ^ init
Chris@19 168
Chris@19 169
Chris@19 170 let main () =
Chris@19 171 begin
Chris@19 172 parse (speclist @ Twiddle.speclist) usage;
Chris@19 173 print_string (generate (check_size ()));
Chris@19 174 end
Chris@19 175
Chris@19 176 let _ = main()