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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . F L O A T _ C O N T R O L --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2000-2011, 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- 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 System.Float_Control is
+ pragma Pure;
+ -- This is not fully correct, but this unit is with-ed by pure units
+ -- (eg s-imgrea).
+
+ procedure Reset;
+ pragma Inline (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.
+end System.Float_Control;