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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . P O W T E N _ L F L T --
-- --
-- S p e c --
-- --
-- Copyright (C) 2020-2024, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package provides tables of powers used for real conversions
package System.Powten_LFlt is
pragma Pure;
Maxpow_Exact : constant := 22;
-- Largest power of five exactly representable with Long_Float. It is equal
-- to floor (M * log 2 / log 5), when M is the size of the mantissa (53).
-- It also works for any number of the form 5*(2**N) and in particular 10.
Maxpow : constant := Maxpow_Exact * 2;
-- Largest power of five exactly representable with double Long_Float
Powfive : constant array (0 .. Maxpow, 1 .. 2) of Long_Float :=
[00 => [5.0**00, 0.0],
01 => [5.0**01, 0.0],
02 => [5.0**02, 0.0],
03 => [5.0**03, 0.0],
04 => [5.0**04, 0.0],
05 => [5.0**05, 0.0],
06 => [5.0**06, 0.0],
07 => [5.0**07, 0.0],
08 => [5.0**08, 0.0],
09 => [5.0**09, 0.0],
10 => [5.0**10, 0.0],
11 => [5.0**11, 0.0],
12 => [5.0**12, 0.0],
13 => [5.0**13, 0.0],
14 => [5.0**14, 0.0],
15 => [5.0**15, 0.0],
16 => [5.0**16, 0.0],
17 => [5.0**17, 0.0],
18 => [5.0**18, 0.0],
19 => [5.0**19, 0.0],
20 => [5.0**20, 0.0],
21 => [5.0**21, 0.0],
22 => [5.0**22, 0.0],
23 => [5.0**23, 5.0**23 - Long_Float'Machine (5.0**23)],
24 => [5.0**24, 5.0**24 - Long_Float'Machine (5.0**24)],
25 => [5.0**25, 5.0**25 - Long_Float'Machine (5.0**25)],
26 => [5.0**26, 5.0**26 - Long_Float'Machine (5.0**26)],
27 => [5.0**27, 5.0**27 - Long_Float'Machine (5.0**27)],
28 => [5.0**28, 5.0**28 - Long_Float'Machine (5.0**28)],
29 => [5.0**29, 5.0**29 - Long_Float'Machine (5.0**29)],
30 => [5.0**30, 5.0**30 - Long_Float'Machine (5.0**30)],
31 => [5.0**31, 5.0**31 - Long_Float'Machine (5.0**31)],
32 => [5.0**32, 5.0**32 - Long_Float'Machine (5.0**32)],
33 => [5.0**33, 5.0**33 - Long_Float'Machine (5.0**33)],
34 => [5.0**34, 5.0**34 - Long_Float'Machine (5.0**34)],
35 => [5.0**35, 5.0**35 - Long_Float'Machine (5.0**35)],
36 => [5.0**36, 5.0**36 - Long_Float'Machine (5.0**36)],
37 => [5.0**37, 5.0**37 - Long_Float'Machine (5.0**37)],
38 => [5.0**38, 5.0**38 - Long_Float'Machine (5.0**38)],
39 => [5.0**39, 5.0**39 - Long_Float'Machine (5.0**39)],
40 => [5.0**40, 5.0**40 - Long_Float'Machine (5.0**40)],
41 => [5.0**41, 5.0**41 - Long_Float'Machine (5.0**41)],
42 => [5.0**42, 5.0**42 - Long_Float'Machine (5.0**42)],
43 => [5.0**43, 5.0**43 - Long_Float'Machine (5.0**43)],
44 => [5.0**44, 5.0**44 - Long_Float'Machine (5.0**44)]];
Powfive_100 : constant array (1 .. 2) of Long_Float :=
[5.0**100, 5.0**100 - Long_Float'Machine (5.0**100)];
Powfive_200 : constant array (1 .. 2) of Long_Float :=
[5.0**200, 5.0**200 - Long_Float'Machine (5.0**200)];
Powfive_300 : constant array (1 .. 2) of Long_Float :=
[5.0**300, 5.0**300 - Long_Float'Machine (5.0**300)];
Powten : constant array (0 .. Maxpow, 1 .. 2) of Long_Float :=
[00 => [1.0E+00, 0.0],
01 => [1.0E+01, 0.0],
02 => [1.0E+02, 0.0],
03 => [1.0E+03, 0.0],
04 => [1.0E+04, 0.0],
05 => [1.0E+05, 0.0],
06 => [1.0E+06, 0.0],
07 => [1.0E+07, 0.0],
08 => [1.0E+08, 0.0],
09 => [1.0E+09, 0.0],
10 => [1.0E+10, 0.0],
11 => [1.0E+11, 0.0],
12 => [1.0E+12, 0.0],
13 => [1.0E+13, 0.0],
14 => [1.0E+14, 0.0],
15 => [1.0E+15, 0.0],
16 => [1.0E+16, 0.0],
17 => [1.0E+17, 0.0],
18 => [1.0E+18, 0.0],
19 => [1.0E+19, 0.0],
20 => [1.0E+20, 0.0],
21 => [1.0E+21, 0.0],
22 => [1.0E+22, 0.0],
23 => [1.0E+23, 1.0E+23 - Long_Float'Machine (1.0E+23)],
24 => [1.0E+24, 1.0E+24 - Long_Float'Machine (1.0E+24)],
25 => [1.0E+25, 1.0E+25 - Long_Float'Machine (1.0E+25)],
26 => [1.0E+26, 1.0E+26 - Long_Float'Machine (1.0E+26)],
27 => [1.0E+27, 1.0E+27 - Long_Float'Machine (1.0E+27)],
28 => [1.0E+28, 1.0E+28 - Long_Float'Machine (1.0E+28)],
29 => [1.0E+29, 1.0E+29 - Long_Float'Machine (1.0E+29)],
30 => [1.0E+30, 1.0E+30 - Long_Float'Machine (1.0E+30)],
31 => [1.0E+31, 1.0E+31 - Long_Float'Machine (1.0E+31)],
32 => [1.0E+32, 1.0E+32 - Long_Float'Machine (1.0E+32)],
33 => [1.0E+33, 1.0E+33 - Long_Float'Machine (1.0E+33)],
34 => [1.0E+34, 1.0E+34 - Long_Float'Machine (1.0E+34)],
35 => [1.0E+35, 1.0E+35 - Long_Float'Machine (1.0E+35)],
36 => [1.0E+36, 1.0E+36 - Long_Float'Machine (1.0E+36)],
37 => [1.0E+37, 1.0E+37 - Long_Float'Machine (1.0E+37)],
38 => [1.0E+38, 1.0E+38 - Long_Float'Machine (1.0E+38)],
39 => [1.0E+39, 1.0E+39 - Long_Float'Machine (1.0E+39)],
40 => [1.0E+40, 1.0E+40 - Long_Float'Machine (1.0E+40)],
41 => [1.0E+41, 1.0E+41 - Long_Float'Machine (1.0E+41)],
42 => [1.0E+42, 1.0E+42 - Long_Float'Machine (1.0E+42)],
43 => [1.0E+43, 1.0E+43 - Long_Float'Machine (1.0E+43)],
44 => [1.0E+44, 1.0E+44 - Long_Float'Machine (1.0E+44)]];
end System.Powten_LFlt;
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