File : 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 -- --
19 -- --
20 -- --
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;