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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                 S Y S T E M . F L O A T _ C O N T R O L                  --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--                     Copyright (C) 2000-2011, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  Control functions for floating-point unit
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package System.Float_Control is
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   pragma Pure;
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   --  This is not fully correct, but this unit is with-ed by pure units
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   --  (eg s-imgrea).
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   procedure Reset;
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   pragma Inline (Reset);
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   --  Reset the floating-point processor to the default state needed to get
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   --  correct Ada semantics for the target. Some third party tools change
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   --  the settings for the floating-point processor. Reset can be called
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   --  to reset the floating-point processor into the mode required by GNAT
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   --  for correct operation. Use this call after a call to foreign code if
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   --  you suspect incorrect floating-point operation after the call.
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   --
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   --  For example under Windows NT some system DLL calls change the default
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   --  FPU arithmetic to 64 bit precision mode. However, since in Ada 95 it
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   --  is required to provide full access to the floating-point types of the
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   --  architecture, GNAT requires full 80-bit precision mode, and Reset makes
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   --  sure this mode is established.
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   --
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   --  Similarly on the PPC processor, it is important that overflow and
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   --  underflow exceptions be disabled.
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   --
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   --  The call to Reset simply has no effect if the target environment
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   --  does not give rise to such concerns.
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end System.Float_Control;

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