gcc/ada/s-bytswa.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                  S Y S T E M . B Y T E _ S W A P P I N G                 --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2006-2012, AdaCore                     --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  Intrinsic routines for byte swapping. These are used by the expanded code
  33 --  (supporting alternative byte ordering), and by the GNAT.Byte_Swapping run
  34 --  time package which provides user level routines for byte swapping.
  35
  36 package System.Byte_Swapping is
  37
  38    pragma Pure;
  39
  40    type U16 is mod 2**16;
  41    type U32 is mod 2**32;
  42    type U64 is mod 2**64;
  43
  44    function Bswap_16 (X : U16) return U16;
  45    pragma Import (Intrinsic, Bswap_16, "__builtin_bswap16");
  46
  47    function Bswap_32 (X : U32) return U32;
  48    pragma Import (Intrinsic, Bswap_32, "__builtin_bswap32");
  49
  50    function Bswap_64 (X : U64) return U64;
  51    pragma Import (Intrinsic, Bswap_64, "__builtin_bswap64");
  52
  53 end System.Byte_Swapping;