54 lines
3 KiB
Ada
54 lines
3 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . B Y T E _ S W A P P I N G --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2006-2012, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- Intrinsic routines for byte swapping. These are used by the expanded code
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-- (supporting alternative byte ordering), and by the GNAT.Byte_Swapping run
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-- time package which provides user level routines for byte swapping.
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package System.Byte_Swapping is
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pragma Pure;
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type U16 is mod 2**16;
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type U32 is mod 2**32;
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type U64 is mod 2**64;
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function Bswap_16 (X : U16) return U16;
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pragma Import (Intrinsic, Bswap_16, "__builtin_bswap16");
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function Bswap_32 (X : U32) return U32;
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pragma Import (Intrinsic, Bswap_32, "__builtin_bswap32");
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function Bswap_64 (X : U64) return U64;
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pragma Import (Intrinsic, Bswap_64, "__builtin_bswap64");
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end System.Byte_Swapping;
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