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 |
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 |
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 |
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 */ |
105 | |