| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- G N A T . F L O A T _ C O N T R O L -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2000-2005 AdaCore -- |
| -- -- |
| -- 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- Control functions for floating-point unit |
| |
| package GNAT.Float_Control is |
| |
| procedure Reset; |
| -- Reset the floating-point processor to the default state needed to get |
| -- correct Ada semantics for the target. Some third party tools change |
| -- the settings for the floating-point processor. Reset can be called |
| -- to reset the floating-point processor into the mode required by GNAT |
| -- for correct operation. Use this call after a call to foreign code if |
| -- you suspect incorrect floating-point operation after the call. |
| -- |
| -- For example under Windows NT some system DLL calls change the default |
| -- FPU arithmetic to 64 bit precision mode. However, since in Ada 95 it |
| -- is required to provide full access to the floating-point types of the |
| -- architecture, GNAT requires full 80-bit precision mode, and Reset makes |
| -- sure this mode is established. |
| -- |
| -- Similarly on the PPC processor, it is important that overflow and |
| -- underflow exceptions be disabled. |
| -- |
| -- The call to Reset simply has no effect if the target environment |
| -- does not give rise to such concerns. |
| |
| private |
| pragma Import (C, Reset, "__gnat_init_float"); |
| |
| end GNAT.Float_Control; |
