--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-bitops.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,99 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
+--                                                                          --
+--                       S Y S T E M . B I T _ O P S                        --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  Operations on packed bit strings
+
+pragma Compiler_Unit_Warning;
+
+with System;
+
+package System.Bit_Ops is
+
+   --  Note: in all the following routines, the System.Address parameters
+   --  represent the address of the first byte of an array used to represent
+   --  a packed array (of type System.Unsigned_Types.Packed_Bytes{1,2,4})
+   --  The length in bits is passed as a separate parameter. Note that all
+   --  addresses must be of byte aligned arrays.
+
+   procedure Bit_And
+     (Left   : System.Address;
+      Llen   : Natural;
+      Right  : System.Address;
+      Rlen   : Natural;
+      Result : System.Address);
+   --  Bitwise "and" of given bit string with result being placed in Result.
+   --  The and operation is allowed to destroy unused bits in the last byte,
+   --  i.e. to leave them set in an undefined manner. Note that Left, Right
+   --  and Result always have the same length in bits (Len).
+
+   function Bit_Eq
+     (Left  : System.Address;
+      Llen  : Natural;
+      Right : System.Address;
+      Rlen  : Natural) return Boolean;
+   --  Left and Right are the addresses of two bit packed arrays with Llen
+   --  and Rlen being the respective length in bits. The routine compares the
+   --  two bit strings for equality, being careful not to include the unused
+   --  bits in the final byte. Note that the result is always False if Rlen
+   --  is not equal to Llen.
+
+   procedure Bit_Not
+     (Opnd   : System.Address;
+      Len    : Natural;
+      Result : System.Address);
+   --  Bitwise "not" of given bit string with result being placed in Result.
+   --  The not operation is allowed to destroy unused bits in the last byte,
+   --  i.e. to leave them set in an undefined manner. Note that Result and
+   --  Opnd always have the same length in bits (Len).
+
+   procedure Bit_Or
+     (Left   : System.Address;
+      Llen   : Natural;
+      Right  : System.Address;
+      Rlen   : Natural;
+      Result : System.Address);
+   --  Bitwise "or" of given bit string with result being placed in Result.
+   --  The or operation is allowed to destroy unused bits in the last byte,
+   --  i.e. to leave them set in an undefined manner. Note that Left, Right
+   --  and Result always have the same length in bits (Len).
+
+   procedure Bit_Xor
+     (Left   : System.Address;
+      Llen   : Natural;
+      Right  : System.Address;
+      Rlen   : Natural;
+      Result : System.Address);
+   --  Bitwise "xor" of given bit string with result being placed in Result.
+   --  The xor operation is allowed to destroy unused bits in the last byte,
+   --  i.e. to leave them set in an undefined manner. Note that Left, Right
+   --  and Result always have the same length in bits (Len).
+
+end System.Bit_Ops;