------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                  S Y S T E M . B Y T E _ S W A P P I N G                 --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--                     Copyright (C) 2006-2020, 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.      --
--                                                                          --
------------------------------------------------------------------------------

--  Intrinsic routines for byte swapping. These are used by the expanded code
--  (supporting alternative byte ordering), and by the GNAT.Byte_Swapping run
--  time package which provides user level routines for byte swapping.

with Interfaces;

package System.Byte_Swapping is

   pragma Pure;

   subtype U16  is Interfaces.Unsigned_16;
   subtype U32  is Interfaces.Unsigned_32;
   subtype U64  is Interfaces.Unsigned_64;
   subtype U128 is Interfaces.Unsigned_128;

   function Bswap_16 (X : U16) return U16;
   pragma Import (Intrinsic, Bswap_16, "__builtin_bswap16");

   function Bswap_32 (X : U32) return U32;
   pragma Import (Intrinsic, Bswap_32, "__builtin_bswap32");

   function Bswap_64 (X : U64) return U64;
   pragma Import (Intrinsic, Bswap_64, "__builtin_bswap64");

   function Bswap_128 (X : U128) return U128;
   pragma Import (Intrinsic, Bswap_128, "__builtin_bswap128");

end System.Byte_Swapping;
