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c093785f | 1 | /* Macros to swap the order of bytes in integer values. m68k version. |
688903eb | 2 | Copyright (C) 1997-2018 Free Software Foundation, Inc. |
c093785f UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
c093785f UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 13 | Lesser General Public License for more details. |
c093785f | 14 | |
3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
c093785f | 18 | |
d0a39e1d | 19 | #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H |
90571408 UD |
20 | # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." |
21 | #endif | |
c093785f | 22 | |
5374babe AJ |
23 | #ifndef _BITS_BYTESWAP_H |
24 | #define _BITS_BYTESWAP_H 1 | |
25 | ||
c093785f UD |
26 | /* Swap bytes in 16 bit value. We don't provide an assembler version |
27 | because GCC is smart enough to generate optimal assembler output, and | |
28 | this allows for better cse. */ | |
d0a39e1d | 29 | #define __bswap_constant_16(x) \ |
8a70b2dc | 30 | ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) |
d0a39e1d | 31 | |
24bb7432 | 32 | static __always_inline unsigned short int |
d0a39e1d AS |
33 | __bswap_16 (unsigned short int __bsx) |
34 | { | |
35 | return __bswap_constant_16 (__bsx); | |
36 | } | |
c093785f UD |
37 | |
38 | /* Swap bytes in 32 bit value. */ | |
39 | #define __bswap_constant_32(x) \ | |
8a70b2dc AS |
40 | ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ |
41 | (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) | |
c093785f | 42 | |
fb3ed187 | 43 | #if !defined(__mcoldfire__) |
24bb7432 | 44 | static __always_inline unsigned int |
fb3ed187 AS |
45 | __bswap_32 (unsigned int __bsx) |
46 | { | |
47 | if (__builtin_constant_p (__bsx)) | |
48 | return __bswap_constant_32 (__bsx); | |
49 | __asm__ __volatile__ ("ror%.w %#8, %0;" | |
50 | "swap %0;" | |
51 | "ror%.w %#8, %0" | |
52 | : "+d" (__bsx)); | |
53 | return __bsx; | |
54 | } | |
c093785f | 55 | #else |
24bb7432 | 56 | static __always_inline unsigned int |
d0a39e1d AS |
57 | __bswap_32 (unsigned int __bsx) |
58 | { | |
59 | return __bswap_constant_32 (__bsx); | |
60 | } | |
c093785f UD |
61 | #endif |
62 | ||
63 | #if defined __GNUC__ && __GNUC__ >= 2 | |
d0a39e1d AS |
64 | /* Swap bytes in 64 bit value. */ |
65 | # define __bswap_constant_64(x) \ | |
8a70b2dc AS |
66 | __extension__ \ |
67 | ((((x) & 0xff00000000000000ull) >> 56) \ | |
68 | | (((x) & 0x00ff000000000000ull) >> 40) \ | |
69 | | (((x) & 0x0000ff0000000000ull) >> 24) \ | |
70 | | (((x) & 0x000000ff00000000ull) >> 8) \ | |
71 | | (((x) & 0x00000000ff000000ull) << 8) \ | |
72 | | (((x) & 0x0000000000ff0000ull) << 24) \ | |
73 | | (((x) & 0x000000000000ff00ull) << 40) \ | |
74 | | (((x) & 0x00000000000000ffull) << 56)) | |
d0a39e1d | 75 | |
c093785f | 76 | /* Swap bytes in 64 bit value. */ |
828beb13 | 77 | __extension__ |
24bb7432 | 78 | static __always_inline unsigned long long |
fb3ed187 AS |
79 | __bswap_64 (unsigned long long __bsx) |
80 | { | |
81 | if (__builtin_constant_p (__bsx)) | |
82 | return __bswap_constant_64 (__bsx); | |
83 | return (__bswap_32 (__bsx >> 32) | |
84 | | ((unsigned long long) __bswap_32 (__bsx) << 32)); | |
85 | } | |
c093785f | 86 | #endif |
5374babe AJ |
87 | |
88 | #endif /* _BITS_BYTESWAP_H */ |