| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . P O W T E N _ L L F -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2023, 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 tables of powers used for real conversions |
| |
| package System.Powten_LLF is |
| pragma Pure; |
| |
| Maxpow_Exact : constant := |
| (if Long_Long_Float'Machine_Mantissa = 64 then 27 else 22); |
| -- Largest power of five exactly representable with Long_Long_Float. It is |
| -- equal to floor (M * log 2 / log 5), when M is the size of the mantissa |
| -- assumed to be either 64 for IEEE Extended or 53 for IEEE Double. |
| -- It also works for any number of the form 5*(2**N) and in particular 10. |
| |
| Maxpow : constant := Maxpow_Exact * 2; |
| -- Largest power of five exactly representable with double Long_Long_Float |
| |
| Powfive : constant array (0 .. 54, 1 .. 2) of Long_Long_Float := |
| [00 => [5.0**00, 0.0], |
| 01 => [5.0**01, 0.0], |
| 02 => [5.0**02, 0.0], |
| 03 => [5.0**03, 0.0], |
| 04 => [5.0**04, 0.0], |
| 05 => [5.0**05, 0.0], |
| 06 => [5.0**06, 0.0], |
| 07 => [5.0**07, 0.0], |
| 08 => [5.0**08, 0.0], |
| 09 => [5.0**09, 0.0], |
| 10 => [5.0**10, 0.0], |
| 11 => [5.0**11, 0.0], |
| 12 => [5.0**12, 0.0], |
| 13 => [5.0**13, 0.0], |
| 14 => [5.0**14, 0.0], |
| 15 => [5.0**15, 0.0], |
| 16 => [5.0**16, 0.0], |
| 17 => [5.0**17, 0.0], |
| 18 => [5.0**18, 0.0], |
| 19 => [5.0**19, 0.0], |
| 20 => [5.0**20, 0.0], |
| 21 => [5.0**21, 0.0], |
| 22 => [5.0**22, 0.0], |
| 23 => [5.0**23, 5.0**23 - Long_Long_Float'Machine (5.0**23)], |
| 24 => [5.0**24, 5.0**24 - Long_Long_Float'Machine (5.0**24)], |
| 25 => [5.0**25, 5.0**25 - Long_Long_Float'Machine (5.0**25)], |
| 26 => [5.0**26, 5.0**26 - Long_Long_Float'Machine (5.0**26)], |
| 27 => [5.0**27, 5.0**27 - Long_Long_Float'Machine (5.0**27)], |
| 28 => [5.0**28, 5.0**28 - Long_Long_Float'Machine (5.0**28)], |
| 29 => [5.0**29, 5.0**29 - Long_Long_Float'Machine (5.0**29)], |
| 30 => [5.0**30, 5.0**30 - Long_Long_Float'Machine (5.0**30)], |
| 31 => [5.0**31, 5.0**31 - Long_Long_Float'Machine (5.0**31)], |
| 32 => [5.0**32, 5.0**32 - Long_Long_Float'Machine (5.0**32)], |
| 33 => [5.0**33, 5.0**33 - Long_Long_Float'Machine (5.0**33)], |
| 34 => [5.0**34, 5.0**34 - Long_Long_Float'Machine (5.0**34)], |
| 35 => [5.0**35, 5.0**35 - Long_Long_Float'Machine (5.0**35)], |
| 36 => [5.0**36, 5.0**36 - Long_Long_Float'Machine (5.0**36)], |
| 37 => [5.0**37, 5.0**37 - Long_Long_Float'Machine (5.0**37)], |
| 38 => [5.0**38, 5.0**38 - Long_Long_Float'Machine (5.0**38)], |
| 39 => [5.0**39, 5.0**39 - Long_Long_Float'Machine (5.0**39)], |
| 40 => [5.0**40, 5.0**40 - Long_Long_Float'Machine (5.0**40)], |
| 41 => [5.0**41, 5.0**41 - Long_Long_Float'Machine (5.0**41)], |
| 42 => [5.0**42, 5.0**42 - Long_Long_Float'Machine (5.0**42)], |
| 43 => [5.0**43, 5.0**43 - Long_Long_Float'Machine (5.0**43)], |
| 44 => [5.0**44, 5.0**44 - Long_Long_Float'Machine (5.0**44)], |
| 45 => [5.0**45, 5.0**45 - Long_Long_Float'Machine (5.0**45)], |
| 46 => [5.0**46, 5.0**46 - Long_Long_Float'Machine (5.0**46)], |
| 47 => [5.0**47, 5.0**47 - Long_Long_Float'Machine (5.0**47)], |
| 48 => [5.0**48, 5.0**48 - Long_Long_Float'Machine (5.0**48)], |
| 49 => [5.0**49, 5.0**49 - Long_Long_Float'Machine (5.0**49)], |
| 50 => [5.0**50, 5.0**50 - Long_Long_Float'Machine (5.0**50)], |
| 51 => [5.0**51, 5.0**51 - Long_Long_Float'Machine (5.0**51)], |
| 52 => [5.0**52, 5.0**52 - Long_Long_Float'Machine (5.0**52)], |
| 53 => [5.0**53, 5.0**53 - Long_Long_Float'Machine (5.0**53)], |
| 54 => [5.0**54, 5.0**54 - Long_Long_Float'Machine (5.0**54)]]; |
| |
| Powfive_100 : constant array (1 .. 2) of Long_Long_Float := |
| [5.0**100, 5.0**100 - Long_Long_Float'Machine (5.0**100)]; |
| |
| Powfive_200 : constant array (1 .. 2) of Long_Long_Float := |
| [5.0**200, 5.0**200 - Long_Long_Float'Machine (5.0**200)]; |
| |
| Powfive_300 : constant array (1 .. 2) of Long_Long_Float := |
| [5.0**300, 5.0**300 - Long_Long_Float'Machine (5.0**300)]; |
| |
| Powten : constant array (0 .. 54, 1 .. 2) of Long_Long_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, 0.0], |
| 12 => [1.0E+12, 0.0], |
| 13 => [1.0E+13, 0.0], |
| 14 => [1.0E+14, 0.0], |
| 15 => [1.0E+15, 0.0], |
| 16 => [1.0E+16, 0.0], |
| 17 => [1.0E+17, 0.0], |
| 18 => [1.0E+18, 0.0], |
| 19 => [1.0E+19, 0.0], |
| 20 => [1.0E+20, 0.0], |
| 21 => [1.0E+21, 0.0], |
| 22 => [1.0E+22, 0.0], |
| 23 => [1.0E+23, 1.0E+23 - Long_Long_Float'Machine (1.0E+23)], |
| 24 => [1.0E+24, 1.0E+24 - Long_Long_Float'Machine (1.0E+24)], |
| 25 => [1.0E+25, 1.0E+25 - Long_Long_Float'Machine (1.0E+25)], |
| 26 => [1.0E+26, 1.0E+26 - Long_Long_Float'Machine (1.0E+26)], |
| 27 => [1.0E+27, 1.0E+27 - Long_Long_Float'Machine (1.0E+27)], |
| 28 => [1.0E+28, 1.0E+28 - Long_Long_Float'Machine (1.0E+28)], |
| 29 => [1.0E+29, 1.0E+29 - Long_Long_Float'Machine (1.0E+29)], |
| 30 => [1.0E+30, 1.0E+30 - Long_Long_Float'Machine (1.0E+30)], |
| 31 => [1.0E+31, 1.0E+31 - Long_Long_Float'Machine (1.0E+31)], |
| 32 => [1.0E+32, 1.0E+32 - Long_Long_Float'Machine (1.0E+32)], |
| 33 => [1.0E+33, 1.0E+33 - Long_Long_Float'Machine (1.0E+33)], |
| 34 => [1.0E+34, 1.0E+34 - Long_Long_Float'Machine (1.0E+34)], |
| 35 => [1.0E+35, 1.0E+35 - Long_Long_Float'Machine (1.0E+35)], |
| 36 => [1.0E+36, 1.0E+36 - Long_Long_Float'Machine (1.0E+36)], |
| 37 => [1.0E+37, 1.0E+37 - Long_Long_Float'Machine (1.0E+37)], |
| 38 => [1.0E+38, 1.0E+38 - Long_Long_Float'Machine (1.0E+38)], |
| 39 => [1.0E+39, 1.0E+39 - Long_Long_Float'Machine (1.0E+39)], |
| 40 => [1.0E+40, 1.0E+40 - Long_Long_Float'Machine (1.0E+40)], |
| 41 => [1.0E+41, 1.0E+41 - Long_Long_Float'Machine (1.0E+41)], |
| 42 => [1.0E+42, 1.0E+42 - Long_Long_Float'Machine (1.0E+42)], |
| 43 => [1.0E+43, 1.0E+43 - Long_Long_Float'Machine (1.0E+43)], |
| 44 => [1.0E+44, 1.0E+44 - Long_Long_Float'Machine (1.0E+44)], |
| 45 => [1.0E+45, 1.0E+45 - Long_Long_Float'Machine (1.0E+45)], |
| 46 => [1.0E+46, 1.0E+46 - Long_Long_Float'Machine (1.0E+46)], |
| 47 => [1.0E+47, 1.0E+47 - Long_Long_Float'Machine (1.0E+47)], |
| 48 => [1.0E+48, 1.0E+48 - Long_Long_Float'Machine (1.0E+48)], |
| 49 => [1.0E+49, 1.0E+49 - Long_Long_Float'Machine (1.0E+49)], |
| 50 => [1.0E+50, 1.0E+50 - Long_Long_Float'Machine (1.0E+50)], |
| 51 => [1.0E+51, 1.0E+51 - Long_Long_Float'Machine (1.0E+51)], |
| 52 => [1.0E+52, 1.0E+52 - Long_Long_Float'Machine (1.0E+52)], |
| 53 => [1.0E+53, 1.0E+53 - Long_Long_Float'Machine (1.0E+53)], |
| 54 => [1.0E+54, 1.0E+54 - Long_Long_Float'Machine (1.0E+54)]]; |
| |
| end System.Powten_LLF; |
