--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-addope.adb	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,110 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         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            --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+pragma Compiler_Unit_Warning;
+
+with Ada.Unchecked_Conversion;
+
+package body System.Address_Operations is
+
+   type IA is mod 2 ** Address'Size;
+   --  The type used to provide the actual desired operations
+
+   function I is new Ada.Unchecked_Conversion (Address, IA);
+   function A is new Ada.Unchecked_Conversion (IA, Address);
+   --  The operations are implemented by unchecked conversion to type IA,
+   --  followed by doing the intrinsic operation on the IA values, followed
+   --  by converting the result back to type Address.
+
+   ----------
+   -- AddA --
+   ----------
+
+   function AddA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) + I (Right));
+   end AddA;
+
+   ----------
+   -- AndA --
+   ----------
+
+   function AndA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) and I (Right));
+   end AndA;
+
+   ----------
+   -- DivA --
+   ----------
+
+   function DivA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) / I (Right));
+   end DivA;
+
+   ----------
+   -- ModA --
+   ----------
+
+   function ModA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) mod I (Right));
+   end ModA;
+
+   ---------
+   -- MulA --
+   ---------
+
+   function MulA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) * I (Right));
+   end MulA;
+
+   ---------
+   -- OrA --
+   ---------
+
+   function OrA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) or I (Right));
+   end OrA;
+
+   ----------
+   -- SubA --
+   ----------
+
+   function SubA (Left, Right : Address) return Address is
+   begin
+      return A (I (Left) - I (Right));
+   end SubA;
+
+end System.Address_Operations;