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1 12 jlechner
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                  S Y S T E M . P O W T E N _ T A B L E                   --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
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-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
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-- Boston, MA 02110-1301, USA.                                              --
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--                                                                          --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- unit, or you link  this unit with other files  to produce an executable, --
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-- this  unit  does not  by itself cause  the resulting  executable  to  be --
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-- covered  by the  GNU  General  Public  License.  This exception does not --
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-- however invalidate  any other reasons why  the executable file  might be --
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-- covered by the  GNU Public License.                                      --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This package provides a powers of ten table used for real conversions
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package System.Powten_Table is
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   pragma Pure;
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   Maxpow : constant := 22;
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   --  The number of entries in this table is chosen to include powers of ten
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   --  that are exactly representable with long_long_float. Assuming that on
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   --  all targets we have 53 bits of mantissa for the type, the upper bound is
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   --  given by 53/(log 5). If the scaling factor for a string is greater than
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   --  Maxpow, it can be obtained by several multiplications, which is less
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   --  efficient than with a bigger table, but avoids anomalies at end points.
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   Powten : constant array (0 .. Maxpow) of Long_Long_Float :=
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      (00 => 1.0E+00,
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       01 => 1.0E+01,
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       02 => 1.0E+02,
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       03 => 1.0E+03,
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       04 => 1.0E+04,
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       05 => 1.0E+05,
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       06 => 1.0E+06,
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       07 => 1.0E+07,
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       08 => 1.0E+08,
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       09 => 1.0E+09,
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       10 => 1.0E+10,
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       11 => 1.0E+11,
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       12 => 1.0E+12,
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       13 => 1.0E+13,
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       14 => 1.0E+14,
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       15 => 1.0E+15,
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       16 => 1.0E+16,
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       17 => 1.0E+17,
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       18 => 1.0E+18,
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       19 => 1.0E+19,
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       20 => 1.0E+20,
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       21 => 1.0E+21,
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       22 => 1.0E+22);
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end System.Powten_Table;

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