New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45955 138bc75d-0d04-0410-961f-82ee72b054a4

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUN-TIME COMPONENTS                         --
+--                                                                          --
+--                    G N A T . F L O A T _ C O N T R O L                   --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--                            $Revision: 1.5 $
+--                                                                          --
+--              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;