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(*
* 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
*
*)
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 R-stride";
"-with-ms",
Arg.String(fun x -> ums := arg_to_stride x),
" specialize for given ms"
]
let byi = Complex.times Complex.i
let byui = Complex.times (Complex.uminus Complex.i)
let shuffle_eo fe fo i = if i mod 2 == 0 then fe (i/2) else fo ((i-1)/2)
let generate n =
let rs = "rs"
and twarray = "W"
and m = "m" and mb = "mb" and me = "me" and ms = "ms"
(* the array names are from the point of view of the complex array
(output in R2C, input in C2R) *)
and arp = "Rp" (* real, positive *)
and aip = "Ip" (* imag, positive *)
and arm = "Rm" (* real, negative *)
and aim = "Im" (* imag, negative *)
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 (bytwiddle, num_twiddles, twdesc) = Twiddle.twiddle_policy 1 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 msms = "-" ^ sms in
(* assume a single location. No point in doing alias analysis *)
let the_location = (Unique.make (), Unique.make ()) in
let locations _ = the_location in
let rlocp = (locative_array_c n
(C.array_subscript arp vrs)
(C.array_subscript aip vrs)
locations sms)
and rlocm = (locative_array_c n
(C.array_subscript arm vrs)
(C.array_subscript aim vrs)
locations msms)
and clocp = (locative_array_c n
(C.array_subscript arp vrs)
(C.array_subscript aip vrs)
locations sms)
and clocm = (locative_array_c n
(C.array_subscript arm vrs)
(C.array_subscript aim vrs)
locations msms)
in
let rloc i = if i mod 2 == 0 then rlocp (i/2) else rlocm ((i-1)/2)
and cloc i = if i < n - i then clocp i else clocm (n-1-i)
and sym n f i =
if (i < n - i) then
f i
else
Complex.times (Complex.nan Expr.CONJ) (f i)
and sym1 f i =
if i mod 2 == 0 then
Complex.plus [f i;
Complex.times (Complex.nan Expr.CONJ) (f (i+1))]
else
Complex.times (Complex.nan Expr.I)
(Complex.plus [Complex.uminus (f (i-1));
Complex.times (Complex.nan Expr.CONJ) (f i)])
and sym1i f i =
if i mod 2 == 0 then
Complex.plus [f i;
Complex.times (Complex.nan Expr.I) (f (i+1))]
else
Complex.times (Complex.nan Expr.CONJ)
(Complex.plus [f (i-1);
Complex.uminus
(Complex.times (Complex.nan Expr.I) (f i))])
in
let asch =
match !ditdif with
| DIT ->
let output =
(Complex.times Complex.half) @@
(Trig.dft_via_rdft sign n (byw (sym1 (load_array_r n rloc)))) in
let odag = store_array_r n cloc (sym n output) in
standard_optimizer odag
| DIF ->
let output =
byw (Trig.dft_via_rdft sign n (sym n (load_array_r n cloc)))
in
let odag = store_array_r n rloc (sym1i output) in
standard_optimizer odag
in
let vms = CVar sms
and varp = CVar arp
and vaip = CVar aip
and varm = CVar arm
and vaim = CVar aim
and vm = CVar m and vmb = CVar mb and vme = CVar me
in
let body = Block (
[Decl ("INT", m)],
[For (list_to_comma
[Expr_assign (vm, vmb);
Expr_assign (CVar twarray,
CPlus [CVar twarray;
ctimes (CPlus [vmb; CUminus (Integer 1)],
bytwvl_vl (Integer nt))])],
Binop (" < ", vm, vme),
list_to_comma
[Expr_assign (vm, CPlus [vm; byvl (Integer 1)]);
Expr_assign (varp, CPlus [varp; byvl vms]);
Expr_assign (vaip, CPlus [vaip; byvl vms]);
Expr_assign (varm, CPlus [varm; CUminus (byvl vms)]);
Expr_assign (vaim, CPlus [vaim; CUminus (byvl vms)]);
Expr_assign (CVar twarray, CPlus [CVar twarray;
bytwvl (Integer nt)]);
make_volatile_stride (4*n) (CVar rs)
],
Asch asch)]
)
in
let tree =
Fcn ("static void", name,
[Decl (C.realtypep, arp);
Decl (C.realtypep, aip);
Decl (C.realtypep, arm);
Decl (C.realtypep, aim);
Decl (C.constrealtypep, twarray);
Decl (C.stridetype, rs);
Decl ("INT", mb);
Decl ("INT", me);
Decl ("INT", ms)],
finalize_fcn 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 hc2c_desc desc = {%d, %s, twinstr, &GENUS, %s};\n\n"
n (stringify name) (flops_of tree)
and register = "X(khc2c_register)"
in
let init =
"\n" ^
twinstr ^
desc ^
(declare_register_fcn name) ^
(Printf.sprintf "{\n%s(p, %s, &desc, HC2C_VIA_DFT);\n}" register name)
in
(unparse tree) ^ "\n" ^ init
let main () =
begin
Simdmagic.simd_mode := true;
parse (speclist @ Twiddle.speclist) usage;
print_string (generate (check_size ()));
end
let _ = main()
|
