mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-18 02:25:11 +00:00
257 lines
7.5 KiB
OCaml
257 lines
7.5 KiB
OCaml
(*
|
|
* Copyright (c) 1997-1999 Massachusetts Institute of Technology
|
|
* Copyright (c) 2003, 2007-14 Matteo Frigo
|
|
* Copyright (c) 2003, 2007-14 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*)
|
|
|
|
(* generation of trigonometric transforms *)
|
|
|
|
open Util
|
|
open Genutil
|
|
open C
|
|
|
|
|
|
let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number>"
|
|
|
|
let uistride = ref Stride_variable
|
|
let uostride = ref Stride_variable
|
|
let uivstride = ref Stride_variable
|
|
let uovstride = ref Stride_variable
|
|
let normalization = ref 1
|
|
|
|
type mode =
|
|
| MDCT
|
|
| MDCT_MP3
|
|
| MDCT_VORBIS
|
|
| MDCT_WINDOW
|
|
| MDCT_WINDOW_SYM
|
|
| IMDCT
|
|
| IMDCT_MP3
|
|
| IMDCT_VORBIS
|
|
| IMDCT_WINDOW
|
|
| IMDCT_WINDOW_SYM
|
|
| NONE
|
|
|
|
let mode = ref NONE
|
|
|
|
let speclist = [
|
|
"-with-istride",
|
|
Arg.String(fun x -> uistride := arg_to_stride x),
|
|
" specialize for given input stride";
|
|
|
|
"-with-ostride",
|
|
Arg.String(fun x -> uostride := arg_to_stride x),
|
|
" specialize for given output stride";
|
|
|
|
"-with-ivstride",
|
|
Arg.String(fun x -> uivstride := arg_to_stride x),
|
|
" specialize for given input vector stride";
|
|
|
|
"-with-ovstride",
|
|
Arg.String(fun x -> uovstride := arg_to_stride x),
|
|
" specialize for given output vector stride";
|
|
|
|
"-normalization",
|
|
Arg.String(fun x -> normalization := int_of_string x),
|
|
" normalization integer to divide by";
|
|
|
|
"-mdct",
|
|
Arg.Unit(fun () -> mode := MDCT),
|
|
" generate an MDCT codelet";
|
|
|
|
"-mdct-mp3",
|
|
Arg.Unit(fun () -> mode := MDCT_MP3),
|
|
" generate an MDCT codelet with MP3 windowing";
|
|
|
|
"-mdct-window",
|
|
Arg.Unit(fun () -> mode := MDCT_WINDOW),
|
|
" generate an MDCT codelet with window array";
|
|
|
|
"-mdct-window-sym",
|
|
Arg.Unit(fun () -> mode := MDCT_WINDOW_SYM),
|
|
" generate an MDCT codelet with symmetric window array";
|
|
|
|
"-imdct",
|
|
Arg.Unit(fun () -> mode := IMDCT),
|
|
" generate an IMDCT codelet";
|
|
|
|
"-imdct-mp3",
|
|
Arg.Unit(fun () -> mode := IMDCT_MP3),
|
|
" generate an IMDCT codelet with MP3 windowing";
|
|
|
|
"-imdct-window",
|
|
Arg.Unit(fun () -> mode := IMDCT_WINDOW),
|
|
" generate an IMDCT codelet with window array";
|
|
|
|
"-imdct-window-sym",
|
|
Arg.Unit(fun () -> mode := IMDCT_WINDOW_SYM),
|
|
" generate an IMDCT codelet with symmetric window array";
|
|
]
|
|
|
|
let unity_window n i = Complex.one
|
|
|
|
(* MP3 window(k) = sin(pi/(2n) * (k + 1/2)) *)
|
|
let mp3_window n k =
|
|
Complex.imag (Complex.exp (8 * n) (2*k + 1))
|
|
|
|
(* Vorbis window(k) = sin(pi/2 * (mp3_window(k))^2)
|
|
... this is transcendental, though, so we can't do it with our
|
|
current Complex.exp function *)
|
|
|
|
let window_array n w =
|
|
array n (fun i ->
|
|
let stride = C.SInteger 1
|
|
and klass = Unique.make () in
|
|
let refr = C.array_subscript w stride i in
|
|
let kr = Variable.make_constant klass refr in
|
|
load_r (kr, kr))
|
|
|
|
let load_window w n i = w i
|
|
let load_window_sym w n i = w (if (i < n) then i else (2*n - 1 - i))
|
|
|
|
(* fixme: use same locations for input and output so that it works in-place? *)
|
|
|
|
(* Note: only correct for even n! *)
|
|
let load_array_mdct window n rarr iarr locations =
|
|
let twon = 2 * n in
|
|
let arr = load_array_c twon
|
|
(locative_array_c twon rarr iarr locations "BUG") in
|
|
let arrw = fun i -> Complex.times (window n i) (arr i) in
|
|
array n
|
|
((Complex.times Complex.half) @@
|
|
(fun i ->
|
|
if (i < n/2) then
|
|
Complex.uminus (Complex.plus [arrw (i + n + n/2);
|
|
arrw (n + n/2 - 1 - i)])
|
|
else
|
|
Complex.plus [arrw (i - n/2);
|
|
Complex.uminus (arrw (n + n/2 - 1 - i))]))
|
|
|
|
let store_array_mdct window n rarr iarr locations arr =
|
|
store_array_r n (locative_array_c n rarr iarr locations "BUG") arr
|
|
|
|
let load_array_imdct window n rarr iarr locations =
|
|
load_array_c n (locative_array_c n rarr iarr locations "BUG")
|
|
|
|
let store_array_imdct window n rarr iarr locations arr =
|
|
let n2 = n/2 in
|
|
let threen2 = 3*n2 in
|
|
let arr2 = fun i ->
|
|
if (i < n2) then
|
|
arr (i + n2)
|
|
else if (i < threen2) then
|
|
Complex.uminus (arr (threen2 - 1 - i))
|
|
else
|
|
Complex.uminus (arr (i - threen2))
|
|
in
|
|
let arr2w = fun i -> Complex.times (window n i) (arr2 i) in
|
|
let twon = 2 * n in
|
|
store_array_r twon (locative_array_c twon rarr iarr locations "BUG") arr2w
|
|
|
|
let window_param = function
|
|
MDCT_WINDOW -> true
|
|
| MDCT_WINDOW_SYM -> true
|
|
| IMDCT_WINDOW -> true
|
|
| IMDCT_WINDOW_SYM -> true
|
|
| _ -> false
|
|
|
|
let generate n mode =
|
|
let iarray = "I"
|
|
and oarray = "O"
|
|
and istride = "istride"
|
|
and ostride = "ostride"
|
|
and window = "W"
|
|
and name = !Magic.codelet_name in
|
|
|
|
let vistride = either_stride (!uistride) (C.SVar istride)
|
|
and vostride = either_stride (!uostride) (C.SVar ostride)
|
|
in
|
|
|
|
let sivs = stride_to_string "ovs" !uovstride in
|
|
let sovs = stride_to_string "ivs" !uivstride in
|
|
|
|
let (transform, load_input, store_output) = match mode with
|
|
| MDCT -> Trig.dctIV, load_array_mdct unity_window,
|
|
store_array_mdct unity_window
|
|
| MDCT_MP3 -> Trig.dctIV, load_array_mdct mp3_window,
|
|
store_array_mdct unity_window
|
|
| MDCT_WINDOW -> Trig.dctIV, load_array_mdct
|
|
(load_window (window_array (2 * n) window)),
|
|
store_array_mdct unity_window
|
|
| MDCT_WINDOW_SYM -> Trig.dctIV, load_array_mdct
|
|
(load_window_sym (window_array n window)),
|
|
store_array_mdct unity_window
|
|
| IMDCT -> Trig.dctIV, load_array_imdct unity_window,
|
|
store_array_imdct unity_window
|
|
| IMDCT_MP3 -> Trig.dctIV, load_array_imdct unity_window,
|
|
store_array_imdct mp3_window
|
|
| IMDCT_WINDOW -> Trig.dctIV, load_array_imdct unity_window,
|
|
store_array_imdct (load_window (window_array (2 * n) window))
|
|
| IMDCT_WINDOW_SYM -> Trig.dctIV, load_array_imdct unity_window,
|
|
store_array_imdct (load_window_sym (window_array n window))
|
|
| _ -> failwith "must specify transform kind"
|
|
in
|
|
|
|
let locations = unique_array_c (2*n) in
|
|
let input =
|
|
load_input n
|
|
(C.array_subscript iarray vistride)
|
|
(C.array_subscript "BUG" vistride)
|
|
locations
|
|
in
|
|
let output = (Complex.times (Complex.inverse_int !normalization))
|
|
@@ (transform n input) in
|
|
let odag =
|
|
store_output n
|
|
(C.array_subscript oarray vostride)
|
|
(C.array_subscript "BUG" vostride)
|
|
locations
|
|
output
|
|
in
|
|
let annot = standard_optimizer odag in
|
|
|
|
let tree =
|
|
Fcn ("void", name,
|
|
([Decl (C.constrealtypep, iarray);
|
|
Decl (C.realtypep, oarray)]
|
|
@ (if stride_fixed !uistride then []
|
|
else [Decl (C.stridetype, istride)])
|
|
@ (if stride_fixed !uostride then []
|
|
else [Decl (C.stridetype, ostride)])
|
|
@ (choose_simd []
|
|
(if stride_fixed !uivstride then [] else
|
|
[Decl ("int", sivs)]))
|
|
@ (choose_simd []
|
|
(if stride_fixed !uovstride then [] else
|
|
[Decl ("int", sovs)]))
|
|
@ (if (not (window_param mode)) then []
|
|
else [Decl (C.constrealtypep, window)])
|
|
),
|
|
finalize_fcn (Asch annot))
|
|
|
|
in
|
|
(unparse tree) ^ "\n"
|
|
|
|
|
|
let main () =
|
|
begin
|
|
parse speclist usage;
|
|
print_string (generate (check_size ()) !mode);
|
|
end
|
|
|
|
let _ = main()
|