------------------------------------------------------------------------------ -- -- -- 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 Ada Core Technologies, 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 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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. -- -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ -- 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;