1                 : /*
       2                 :  * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
       3                 :  *
       4                 :  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
       5                 :  * 
       6                 :  * This file contains Original Code and/or Modifications of Original Code
       7                 :  * as defined in and that are subject to the Apple Public Source License
       8                 :  * Version 2.0 (the 'License'). You may not use this file except in
       9                 :  * compliance with the License. The rights granted to you under the License
      10                 :  * may not be used to create, or enable the creation or redistribution of,
      11                 :  * unlawful or unlicensed copies of an Apple operating system, or to
      12                 :  * circumvent, violate, or enable the circumvention or violation of, any
      13                 :  * terms of an Apple operating system software license agreement.
      14                 :  * 
      15                 :  * Please obtain a copy of the License at
      16                 :  * http://www.opensource.apple.com/apsl/ and read it before using this file.
      17                 :  * 
      18                 :  * The Original Code and all software distributed under the License are
      19                 :  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
      20                 :  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
      21                 :  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
      22                 :  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
      23                 :  * Please see the License for the specific language governing rights and
      24                 :  * limitations under the License.
      25                 :  * 
      26                 :  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
      27                 :  */
      28                 : 
      29                 : #ifndef _OS__OSBYTEORDERI386_H
      30                 : #define _OS__OSBYTEORDERI386_H
      31                 : 
      32                 : #if !defined(__DARWIN_OS_INLINE)
      33                 : # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
      34                 : #        define __DARWIN_OS_INLINE static inline
      35                 : # elif defined(__MWERKS__) || defined(__cplusplus)
      36                 : #        define __DARWIN_OS_INLINE static inline
      37                 : # else
      38                 : #        define __DARWIN_OS_INLINE static __inline__
      39                 : # endif
      40                 : #endif
      41                 : 
      42                 : /* Generic byte swapping functions. */
      43                 : 
      44                 : __DARWIN_OS_INLINE
      45                 : __uint16_t
      46                 : _OSSwapInt16(
      47              34 :     __uint16_t        _data
      48                 : )
      49                 : {
      50              34 :     return ((_data << 8) | (_data >> 8));
      51                 : }
      52                 : 
      53                 : __DARWIN_OS_INLINE
      54                 : __uint32_t
      55                 : _OSSwapInt32(
      56               0 :     __uint32_t        _data
      57                 : )
      58                 : {
      59                 : #if defined(__llvm__)
      60               0 :     return __builtin_bswap32(_data);
      61                 : #else
      62                 :     __asm__ ("bswap   %0" : "+r" (_data));
      63                 :     return _data;
      64                 : #endif
      65                 : }
      66                 : 
      67                 : #if defined(__llvm__)
      68                 : __DARWIN_OS_INLINE
      69                 : __uint64_t
      70                 : _OSSwapInt64(
      71                 :     __uint64_t        _data
      72                 : )
      73                 : {
      74                 :     return __builtin_bswap64(_data);
      75                 : }
      76                 : 
      77                 : #elif defined(__i386__)
      78                 : __DARWIN_OS_INLINE
      79                 : __uint64_t
      80                 : _OSSwapInt64(
      81                 :     __uint64_t        _data
      82                 : )
      83                 : {
      84                 :     __asm__ ("bswap   %%eax\n\t"
      85                 :              "bswap   %%edx\n\t" 
      86                 :              "xchgl   %%eax, %%edx"
      87                 :              : "+A" (_data));
      88                 :     return _data;
      89                 : }
      90                 : #elif defined(__x86_64__)
      91                 : __DARWIN_OS_INLINE
      92                 : __uint64_t
      93                 : _OSSwapInt64(
      94                 :     __uint64_t        _data
      95                 : )
      96                 : {
      97                 :     __asm__ ("bswap   %0" : "+r" (_data));
      98                 :     return _data;
      99                 : }
     100                 : #else
     101                 : #error Unknown architecture
     102                 : #endif
     103                 : 
     104                 : #endif /* ! _OS__OSBYTEORDERI386_H */