blob: 0967403a9739c546ecd6876b1a63f70e3465b9a2 [file] [log] [blame]
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . P O W T E N _ F L T --
-- --
-- S p e c --
-- --
-- Copyright (C) 2020-2021, 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_Flt is
pragma Pure;
Maxpow_Exact : constant := 10;
-- Largest power of ten exactly representable with Float. It is equal to
-- floor (M * log 2 / log 5), when M is the size of the mantissa (24).
Maxpow : constant := Maxpow_Exact * 2;
-- Largest power of ten exactly representable with a double Float
Powten : constant array (0 .. Maxpow, 1 .. 2) of 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, 1.0E+11 - Float'Machine (1.0E+11)),
12 => (1.0E+12, 1.0E+12 - Float'Machine (1.0E+12)),
13 => (1.0E+13, 1.0E+13 - Float'Machine (1.0E+13)),
14 => (1.0E+14, 1.0E+14 - Float'Machine (1.0E+14)),
15 => (1.0E+15, 1.0E+15 - Float'Machine (1.0E+15)),
16 => (1.0E+16, 1.0E+16 - Float'Machine (1.0E+16)),
17 => (1.0E+17, 1.0E+17 - Float'Machine (1.0E+17)),
18 => (1.0E+18, 1.0E+18 - Float'Machine (1.0E+18)),
19 => (1.0E+19, 1.0E+19 - Float'Machine (1.0E+19)),
20 => (1.0E+20, 1.0E+20 - Float'Machine (1.0E+20)));
end System.Powten_Flt;