--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-addope.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,87 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--             S Y S T E M . A D D R E S S _ O P E R A T I O N S            --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2004-2017, Free Software Foundation, 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 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides arithmetic and logical operations on type Address.
+--  It is intended for use by other packages in the System hierarchy. For
+--  applications requiring this capability, see System.Storage_Elements or
+--  the operations introduced in System.Aux_DEC;
+
+--  The reason we need this package is that arithmetic operations may not
+--  be available in the case where type Address is non-private and the
+--  operations have been made abstract in the spec of System (to avoid
+--  inappropriate use by applications programs). In addition, the logical
+--  operations may not be available if type Address is a signed integer.
+
+pragma Compiler_Unit_Warning;
+
+package System.Address_Operations is
+   pragma Pure;
+
+   --  The semantics of the arithmetic operations are those that apply to
+   --  a modular type with the same length as Address, i.e. they provide
+   --  twos complement wrap around arithmetic treating the address value
+   --  as an unsigned value, with no overflow checking.
+
+   --  Note that we do not use the infix names for these operations to
+   --  avoid problems with ambiguities coming from declarations in package
+   --  Standard (which may or may not be visible depending on the exact
+   --  form of the declaration of type System.Address).
+
+   --  For addition, subtraction, and multiplication, the effect of overflow
+   --  is 2's complement wrapping (as though the type Address were unsigned).
+
+   --  For division and modulus operations, the caller is responsible for
+   --  ensuring that the Right argument is non-zero, and the effect of the
+   --  call is not specified if a zero argument is passed.
+
+   function AddA (Left, Right : Address) return Address;
+   function SubA (Left, Right : Address) return Address;
+   function MulA (Left, Right : Address) return Address;
+   function DivA (Left, Right : Address) return Address;
+   function ModA (Left, Right : Address) return Address;
+
+   --  The semantics of the logical operations are those that apply to
+   --  a modular type with the same length as Address, i.e. they provide
+   --  bit-wise operations on all bits of the value (including the sign
+   --  bit if Address is a signed integer type).
+
+   function AndA (Left, Right : Address) return Address;
+   function OrA  (Left, Right : Address) return Address;
+
+   pragma Inline_Always (AddA);
+   pragma Inline_Always (SubA);
+   pragma Inline_Always (MulA);
+   pragma Inline_Always (DivA);
+   pragma Inline_Always (ModA);
+   pragma Inline_Always (AndA);
+   pragma Inline_Always (OrA);
+
+end System.Address_Operations;