------------------------------------------------------------------------------ | |

-- -- | |

-- 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; |