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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . P O W T E N _ L L F --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2021, 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 a powers of ten table used for real conversions
package System.Powten_LLF is
pragma Pure;
Maxpow_Exact : constant :=
(if Long_Long_Float'Machine_Mantissa = 64 then 27 else 22);
-- Largest power of ten exactly representable with Long_Long_Float. It is
-- equal to floor (M * log 2 / log 5), when M is the size of the mantissa
-- assumed to be either 64 for IEEE Extended or 53 for IEEE Double.
Maxpow : constant := Maxpow_Exact * 2;
-- Largest power of ten exactly representable with a double Long_Long_Float
Powten : constant array (0 .. 54, 1 .. 2) of Long_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_Long_Float'Machine (1.0E+23)),
24 => (1.0E+24, 1.0E+24 - Long_Long_Float'Machine (1.0E+24)),
25 => (1.0E+25, 1.0E+25 - Long_Long_Float'Machine (1.0E+25)),
26 => (1.0E+26, 1.0E+26 - Long_Long_Float'Machine (1.0E+26)),
27 => (1.0E+27, 1.0E+27 - Long_Long_Float'Machine (1.0E+27)),
28 => (1.0E+28, 1.0E+28 - Long_Long_Float'Machine (1.0E+28)),
29 => (1.0E+29, 1.0E+29 - Long_Long_Float'Machine (1.0E+29)),
30 => (1.0E+30, 1.0E+30 - Long_Long_Float'Machine (1.0E+30)),
31 => (1.0E+31, 1.0E+31 - Long_Long_Float'Machine (1.0E+31)),
32 => (1.0E+32, 1.0E+32 - Long_Long_Float'Machine (1.0E+32)),
33 => (1.0E+33, 1.0E+33 - Long_Long_Float'Machine (1.0E+33)),
34 => (1.0E+34, 1.0E+34 - Long_Long_Float'Machine (1.0E+34)),
35 => (1.0E+35, 1.0E+35 - Long_Long_Float'Machine (1.0E+35)),
36 => (1.0E+36, 1.0E+36 - Long_Long_Float'Machine (1.0E+36)),
37 => (1.0E+37, 1.0E+37 - Long_Long_Float'Machine (1.0E+37)),
38 => (1.0E+38, 1.0E+38 - Long_Long_Float'Machine (1.0E+38)),
39 => (1.0E+39, 1.0E+39 - Long_Long_Float'Machine (1.0E+39)),
40 => (1.0E+40, 1.0E+40 - Long_Long_Float'Machine (1.0E+40)),
41 => (1.0E+41, 1.0E+41 - Long_Long_Float'Machine (1.0E+41)),
42 => (1.0E+42, 1.0E+42 - Long_Long_Float'Machine (1.0E+42)),
43 => (1.0E+43, 1.0E+43 - Long_Long_Float'Machine (1.0E+43)),
44 => (1.0E+44, 1.0E+44 - Long_Long_Float'Machine (1.0E+44)),
45 => (1.0E+45, 1.0E+45 - Long_Long_Float'Machine (1.0E+45)),
46 => (1.0E+46, 1.0E+46 - Long_Long_Float'Machine (1.0E+46)),
47 => (1.0E+47, 1.0E+47 - Long_Long_Float'Machine (1.0E+47)),
48 => (1.0E+48, 1.0E+48 - Long_Long_Float'Machine (1.0E+48)),
49 => (1.0E+49, 1.0E+49 - Long_Long_Float'Machine (1.0E+49)),
50 => (1.0E+50, 1.0E+50 - Long_Long_Float'Machine (1.0E+50)),
51 => (1.0E+51, 1.0E+51 - Long_Long_Float'Machine (1.0E+51)),
52 => (1.0E+52, 1.0E+52 - Long_Long_Float'Machine (1.0E+52)),
53 => (1.0E+53, 1.0E+53 - Long_Long_Float'Machine (1.0E+53)),
54 => (1.0E+54, 1.0E+54 - Long_Long_Float'Machine (1.0E+54)));
end System.Powten_LLF;