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| author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
|---|---|---|
| committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
| commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
| tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/ada/s-powtab.ads | |
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Diffstat (limited to 'gcc/ada/s-powtab.ads')
| -rw-r--r-- | gcc/ada/s-powtab.ads | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/gcc/ada/s-powtab.ads b/gcc/ada/s-powtab.ads new file mode 100644 index 000000000..ea1820b13 --- /dev/null +++ b/gcc/ada/s-powtab.ads @@ -0,0 +1,70 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . P O W T E N _ T A B L E -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2009 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_Table is + pragma Pure; + + Maxpow : constant := 22; + -- The number of entries in this table is chosen to include powers of ten + -- that are exactly representable with long_long_float. Assuming that on + -- all targets we have 53 bits of mantissa for the type, the upper bound is + -- given by 53/(log 5). If the scaling factor for a string is greater than + -- Maxpow, it can be obtained by several multiplications, which is less + -- efficient than with a bigger table, but avoids anomalies at end points. + + Powten : constant array (0 .. Maxpow) of Long_Long_Float := + (00 => 1.0E+00, + 01 => 1.0E+01, + 02 => 1.0E+02, + 03 => 1.0E+03, + 04 => 1.0E+04, + 05 => 1.0E+05, + 06 => 1.0E+06, + 07 => 1.0E+07, + 08 => 1.0E+08, + 09 => 1.0E+09, + 10 => 1.0E+10, + 11 => 1.0E+11, + 12 => 1.0E+12, + 13 => 1.0E+13, + 14 => 1.0E+14, + 15 => 1.0E+15, + 16 => 1.0E+16, + 17 => 1.0E+17, + 18 => 1.0E+18, + 19 => 1.0E+19, + 20 => 1.0E+20, + 21 => 1.0E+21, + 22 => 1.0E+22); + +end System.Powten_Table; |