1 /*
2 * Copyright (c) 2006-2012 Apple 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
_OSSwapInt16(__uint16_t _data)46 _OSSwapInt16(
47 __uint16_t _data
48 )
49 {
50 return (__uint16_t)((_data << 8) | (_data >> 8));
51 }
52
53 __DARWIN_OS_INLINE
54 __uint32_t
_OSSwapInt32(__uint32_t _data)55 _OSSwapInt32(
56 __uint32_t _data
57 )
58 {
59 #if defined(__llvm__)
60 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
_OSSwapInt64(__uint64_t _data)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
_OSSwapInt64(__uint64_t _data)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
_OSSwapInt64(__uint64_t _data)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 */
105