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Diffstat (limited to 'gcc-4.3.1/gcc/ada/g-flocon.ads')
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1 files changed, 61 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/g-flocon.ads b/gcc-4.3.1/gcc/ada/g-flocon.ads new file mode 100644 index 000000000..ea60768db --- /dev/null +++ b/gcc-4.3.1/gcc/ada/g-flocon.ads @@ -0,0 +1,61 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |