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#!/usr/bin/env escript
%% -*- erlang -*-
%%! +A0
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2017-2021. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-mode(compile).
-define(MOD, "io_lib_format_ryu_table").
-define(TABLE_SIZE, 326).
-define(INV_TABLE_SIZE, 342).
-define(POW5_BITCOUNT, 125).
-define(POW5_INV_BITCOUNT, 125).
main(_) ->
Values = [ values(X) || X <- lists:seq(0, ?TABLE_SIZE - 1)],
InvValues = [ inv_values(X) || X <- lists:seq(0, ?INV_TABLE_SIZE - 1)],
%% Make module
{ok, Out} = file:open("../src/" ++ ?MOD ++ ".erl", [write]),
gen_file(Out, Values, InvValues),
ok = file:close(Out),
ok.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
inv_values(X) ->
Pow = pow5(X),
Pow5len = log2floor(Pow),
J = Pow5len + ?POW5_INV_BITCOUNT - 1,
Inv = ((1 bsl J) div Pow) + 1,
{X, Inv}.
values(X) ->
Pow = pow5(X),
Pow5len = log2floor(Pow),
Pow5 = Pow bsr (Pow5len - ?POW5_BITCOUNT),
{X, Pow5}.
pow5(0) ->
1;
pow5(1) ->
5;
pow5(X) ->
5 * pow5(X - 1).
log2floor(Int) when is_integer(Int), Int > 0 ->
log2floor(Int, 0).
log2floor(0, N) ->
N;
log2floor(Int, N) ->
log2floor(Int bsr 1, 1 + N).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
gen_file(Fd, Values, InvValues) ->
gen_header(Fd),
gen_pow5_static(Fd),
gen_table(Fd, Values),
gen_inv_table(Fd, InvValues),
ok.
gen_header(Fd) ->
io:put_chars(Fd, "%%\n%% this file is generated do not modify\n"),
io:put_chars(Fd, "%% see ../script/generate_ryu_table.escript\n\n"),
io:put_chars(Fd, "-module(" ++ ?MOD ++").\n"),
io:put_chars(Fd, "-export([pow5_bitcount/0, pow5_inv_bitcount/0, value/1, inv_value/1]).\n\n"),
ok.
gen_pow5_static(Fd) ->
io:put_chars(Fd, "-spec pow5_bitcount() -> integer().\n"),
io:format(Fd, "pow5_bitcount() -> ~p.~n~n", [?POW5_BITCOUNT]),
io:put_chars(Fd, "-spec pow5_inv_bitcount() -> integer().\n"),
io:format(Fd, "pow5_inv_bitcount() -> ~p.~n~n", [?POW5_INV_BITCOUNT]),
ok.
gen_table(Fd, Values) ->
io:put_chars(Fd, "-spec value(integer()) -> integer().\n"),
[io:format(Fd, "value(~p) -> ~p;~n", [Key, Val]) || {Key,Val} <- Values],
io:put_chars(Fd, "value(_) -> error(function_clause).\n\n"),
ok.
gen_inv_table(Fd, Values) ->
io:put_chars(Fd, "-spec inv_value(integer()) -> integer().\n"),
[io:format(Fd, "inv_value(~p) -> ~p;~n", [Key, Val]) || {Key,Val} <- Values],
io:put_chars(Fd, "inv_value(_) -> error(function_clause).\n"),
ok.
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