mirror of
https://github.com/tildearrow/furnace.git
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257 lines
7.2 KiB
OCaml
257 lines
7.2 KiB
OCaml
(*
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* Copyright (c) 1997-1999 Massachusetts Institute of Technology
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* Copyright (c) 2003, 2007-14 Matteo Frigo
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* Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*)
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(* generation of trigonometric transforms *)
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open Util
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open Genutil
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open C
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let usage = "Usage: " ^ Sys.argv.(0) ^ " -n <number>"
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let uistride = ref Stride_variable
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let uostride = ref Stride_variable
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let uivstride = ref Stride_variable
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let uovstride = ref Stride_variable
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type mode =
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| RDFT
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| HDFT
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| DHT
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| REDFT00
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| REDFT10
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| REDFT01
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| REDFT11
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| RODFT00
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| RODFT10
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| RODFT01
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| RODFT11
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| NONE
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let mode = ref NONE
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let normsqr = ref 1
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let unitary = ref false
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let noloop = ref false
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let speclist = [
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"-with-istride",
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Arg.String(fun x -> uistride := arg_to_stride x),
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" specialize for given input stride";
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"-with-ostride",
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Arg.String(fun x -> uostride := arg_to_stride x),
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" specialize for given output stride";
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"-with-ivstride",
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Arg.String(fun x -> uivstride := arg_to_stride x),
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" specialize for given input vector stride";
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"-with-ovstride",
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Arg.String(fun x -> uovstride := arg_to_stride x),
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" specialize for given output vector stride";
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"-rdft",
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Arg.Unit(fun () -> mode := RDFT),
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" generate a real DFT codelet";
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"-hdft",
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Arg.Unit(fun () -> mode := HDFT),
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" generate a Hermitian DFT codelet";
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"-dht",
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Arg.Unit(fun () -> mode := DHT),
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" generate a DHT codelet";
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"-redft00",
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Arg.Unit(fun () -> mode := REDFT00),
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" generate a DCT-I codelet";
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"-redft10",
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Arg.Unit(fun () -> mode := REDFT10),
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" generate a DCT-II codelet";
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"-redft01",
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Arg.Unit(fun () -> mode := REDFT01),
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" generate a DCT-III codelet";
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"-redft11",
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Arg.Unit(fun () -> mode := REDFT11),
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" generate a DCT-IV codelet";
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"-rodft00",
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Arg.Unit(fun () -> mode := RODFT00),
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" generate a DST-I codelet";
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"-rodft10",
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Arg.Unit(fun () -> mode := RODFT10),
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" generate a DST-II codelet";
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"-rodft01",
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Arg.Unit(fun () -> mode := RODFT01),
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" generate a DST-III codelet";
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"-rodft11",
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Arg.Unit(fun () -> mode := RODFT11),
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" generate a DST-IV codelet";
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"-normalization",
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Arg.String(fun x -> let ix = int_of_string x in normsqr := ix * ix),
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" normalization integer to divide by";
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"-normsqr",
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Arg.String(fun x -> normsqr := int_of_string x),
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" integer square of normalization to divide by";
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"-unitary",
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Arg.Unit(fun () -> unitary := true),
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" unitary normalization (up overall scale factor)";
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"-noloop",
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Arg.Unit(fun () -> noloop := true),
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" no vector loop";
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]
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let sqrt_half = Complex.inverse_int_sqrt 2
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let sqrt_two = Complex.int_sqrt 2
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let rescale sc s1 s2 input i =
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if ((i == s1 || i == s2) && !unitary) then
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Complex.times (input i) sc
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else
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input i
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let generate n mode =
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let iarray = "I"
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and oarray = "O"
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and istride = "is"
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and ostride = "os"
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and i = "i"
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and v = "v"
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in
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let sign = !Genutil.sign
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and name = !Magic.codelet_name in
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let vistride = either_stride (!uistride) (C.SVar istride)
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and vostride = either_stride (!uostride) (C.SVar ostride)
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in
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let sovs = stride_to_string "ovs" !uovstride in
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let sivs = stride_to_string "ivs" !uivstride in
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let (transform, load_input, store_output, si1,si2,so1,so2) = match mode with
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| RDFT -> Trig.rdft sign, load_array_r, store_array_hc, -1,-1,-1,-1
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| HDFT -> Trig.hdft sign, load_array_c, store_array_r, -1,-1,-1,-1 (* TODO *)
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| DHT -> Trig.dht 1, load_array_r, store_array_r, -1,-1,-1,-1
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| REDFT00 -> Trig.dctI, load_array_r, store_array_r, 0,n-1,0,n-1
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| REDFT10 -> Trig.dctII, load_array_r, store_array_r, -1,-1,0,-1
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| REDFT01 -> Trig.dctIII, load_array_r, store_array_r, 0,-1,-1,-1
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| REDFT11 -> Trig.dctIV, load_array_r, store_array_r, -1,-1,-1,-1
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| RODFT00 -> Trig.dstI, load_array_r, store_array_r, -1,-1,-1,-1
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| RODFT10 -> Trig.dstII, load_array_r, store_array_r, -1,-1,n-1,-1
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| RODFT01 -> Trig.dstIII, load_array_r, store_array_r, n-1,-1,-1,-1
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| RODFT11 -> Trig.dstIV, load_array_r, store_array_r, -1,-1,-1,-1
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| _ -> failwith "must specify transform kind"
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in
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let locations = unique_array_c n in
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let input = locative_array_c n
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(C.array_subscript iarray vistride)
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(C.array_subscript "BUG" vistride)
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locations sivs in
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let output = rescale sqrt_half so1 so2
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((Complex.times (Complex.inverse_int_sqrt !normsqr))
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@@ (transform n (rescale sqrt_two si1 si2 (load_array_c n input)))) in
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let oloc =
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locative_array_c n
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(C.array_subscript oarray vostride)
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(C.array_subscript "BUG" vostride)
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locations sovs in
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let odag = store_output n oloc output in
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let annot = standard_optimizer odag in
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let body = if !noloop then Block([], [Asch annot]) else Block (
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[Decl ("INT", i)],
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[For (Expr_assign (CVar i, CVar v),
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Binop (" > ", CVar i, Integer 0),
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list_to_comma
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[Expr_assign (CVar i, CPlus [CVar i; CUminus (Integer 1)]);
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Expr_assign (CVar iarray, CPlus [CVar iarray; CVar sivs]);
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Expr_assign (CVar oarray, CPlus [CVar oarray; CVar sovs]);
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make_volatile_stride (2*n) (CVar istride);
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make_volatile_stride (2*n) (CVar ostride)
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],
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Asch annot)
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])
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in
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let tree =
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Fcn ((if !Magic.standalone then "void" else "static void"), name,
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([Decl (C.constrealtypep, iarray);
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Decl (C.realtypep, oarray)]
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@ (if stride_fixed !uistride then []
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else [Decl (C.stridetype, istride)])
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@ (if stride_fixed !uostride then []
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else [Decl (C.stridetype, ostride)])
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@ (if !noloop then [] else
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[Decl ("INT", v)]
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@ (if stride_fixed !uivstride then []
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else [Decl ("INT", "ivs")])
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@ (if stride_fixed !uovstride then []
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else [Decl ("INT", "ovs")]))),
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finalize_fcn body)
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in let desc =
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Printf.sprintf
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"static const kr2r_desc desc = { %d, \"%s\", %s, &GENUS, %s };\n\n"
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n name (flops_of tree)
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(match mode with
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| RDFT -> "RDFT00"
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| HDFT -> "HDFT00"
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| DHT -> "DHT"
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| REDFT00 -> "REDFT00"
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| REDFT10 -> "REDFT10"
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| REDFT01 -> "REDFT01"
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| REDFT11 -> "REDFT11"
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| RODFT00 -> "RODFT00"
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| RODFT10 -> "RODFT10"
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| RODFT01 -> "RODFT01"
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| RODFT11 -> "RODFT11"
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| _ -> failwith "must specify a transform kind")
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and init =
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(declare_register_fcn name) ^
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"{" ^
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" X(kr2r_register)(p, " ^ name ^ ", &desc);\n" ^
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"}\n"
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in
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(unparse tree) ^ "\n" ^ (if !Magic.standalone then "" else desc ^ init)
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let main () =
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begin
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parse speclist usage;
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print_string (generate (check_size ()) !mode);
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end
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let _ = main()
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