------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
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--                    S Y S T E M . P O W T E N _ F L T                     --
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--             Copyright (C) 2020-2021, Free Software Foundation, Inc.      --
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--                                                                          --
------------------------------------------------------------------------------

--  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;