Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-flocon.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT RUN-TIME COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . F L O A T _ C O N T R O L -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 2000-2017, AdaCore -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 -- Control functions for floating-point unit | |
| 33 | |
| 34 package System.Float_Control is | |
| 35 pragma Pure; | |
| 36 -- This is not fully correct, but this unit is with-ed by pure units | |
| 37 -- (eg s-imgrea). | |
| 38 | |
| 39 procedure Reset; | |
| 40 pragma Inline (Reset); | |
| 41 -- Reset the floating-point processor to the default state needed to get | |
| 42 -- correct Ada semantics for the target. Some third party tools change | |
| 43 -- the settings for the floating-point processor. Reset can be called | |
| 44 -- to reset the floating-point processor into the mode required by GNAT | |
| 45 -- for correct operation. Use this call after a call to foreign code if | |
| 46 -- you suspect incorrect floating-point operation after the call. | |
| 47 -- | |
| 48 -- For example under Windows NT some system DLL calls change the default | |
| 49 -- FPU arithmetic to 64 bit precision mode. However, since in Ada 95 it | |
| 50 -- is required to provide full access to the floating-point types of the | |
| 51 -- architecture, GNAT requires full 80-bit precision mode, and Reset makes | |
| 52 -- sure this mode is established. | |
| 53 -- | |
| 54 -- Similarly on the PPC processor, it is important that overflow and | |
| 55 -- underflow exceptions be disabled. | |
| 56 -- | |
| 57 -- The call to Reset simply has no effect if the target environment | |
| 58 -- does not give rise to such concerns. | |
| 59 end System.Float_Control; |