projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d5efd131 MF |
1 | /* Macros to swap the order of bytes in integer values. |
| 2 | Copyright (C) 1997,1998,2000,2002,2003,2008,2011 | |
| 3 | Free Software Foundation, Inc. | |
| 4 | This file is part of the GNU C Library. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 75efb018 MF |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| d5efd131 MF |
19 | |
| 20 | #if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H | |
| 21 | # error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." | |
| 22 | #endif | |
| 23 | ||
| 24 | #ifndef _BITS_BYTESWAP_H | |
| 25 | #define _BITS_BYTESWAP_H 1 | |
| 26 | ||
| 27 | /* Swap bytes in 16 bit value. */ | |
| 28 | #define __bswap_constant_16(x) \ | |
| 29 | ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) | |
| 30 | ||
| 31 | #if defined __GNUC__ && __GNUC__ >= 2 | |
| 32 | # define __bswap_16(x) \ | |
| 33 | (__extension__ \ | |
| 34 | ({ register unsigned short int __v, __x = (x); \ | |
| 35 | if (__builtin_constant_p (x)) \ | |
| 36 | __v = __bswap_constant_16 (__x); \ | |
| 37 | else \ | |
| 38 | __asm__ __volatile__ ("shl %0 = %1, 48 ;;" \ | |
| 39 | "mux1 %0 = %0, @rev ;;" \ | |
| 40 | : "=r" (__v) \ | |
| 41 | : "r" ((unsigned short int) (__x))); \ | |
| 42 | __v; })) | |
| 43 | #else | |
| 44 | /* This is better than nothing. */ | |
| 45 | static __inline unsigned short int | |
| 46 | __bswap_16 (unsigned short int __bsx) | |
| 47 | { | |
| 48 | return __bswap_constant_16 (__bsx); | |
| 49 | } | |
| 50 | #endif | |
| 51 | ||
| 52 | ||
| 53 | /* Swap bytes in 32 bit value. */ | |
| 54 | #define __bswap_constant_32(x) \ | |
| 55 | ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ | |
| 56 | (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) | |
| 57 | ||
| 58 | #if defined __GNUC__ && __GNUC__ >= 2 | |
| 59 | # define __bswap_32(x) \ | |
| 60 | (__extension__ \ | |
| 61 | ({ register unsigned int __v, __x = (x); \ | |
| 62 | if (__builtin_constant_p (x)) \ | |
| 63 | __v = __bswap_constant_32 (__x); \ | |
| 64 | else \ | |
| 65 | __asm__ __volatile__ ("shl %0 = %1, 32 ;;" \ | |
| 66 | "mux1 %0 = %0, @rev ;;" \ | |
| 67 | : "=r" (__v) \ | |
| 68 | : "r" ((unsigned int) (__x))); \ | |
| 69 | __v; })) | |
| 70 | #else | |
| 71 | static __inline unsigned int | |
| 72 | __bswap_32 (unsigned int __bsx) | |
| 73 | { | |
| 74 | return __bswap_constant_32 (__bsx); | |
| 75 | } | |
| 76 | #endif | |
| 77 | ||
| 78 | ||
| 79 | /* Swap bytes in 64 bit value. */ | |
| 80 | #if defined __GNUC__ && __GNUC__ >= 2 | |
| 81 | # define __bswap_constant_64(x) \ | |
| 82 | (__extension__ ((((x) & 0xff00000000000000ul) >> 56) \ | |
| 83 | | (((x) & 0x00ff000000000000ul) >> 40) \ | |
| 84 | | (((x) & 0x0000ff0000000000ul) >> 24) \ | |
| 85 | | (((x) & 0x000000ff00000000ul) >> 8) \ | |
| 86 | | (((x) & 0x00000000ff000000ul) << 8) \ | |
| 87 | | (((x) & 0x0000000000ff0000ul) << 24) \ | |
| 88 | | (((x) & 0x000000000000ff00ul) << 40) \ | |
| 89 | | (((x) & 0x00000000000000fful) << 56))) | |
| 90 | ||
| 91 | # define __bswap_64(x) \ | |
| 92 | (__extension__ \ | |
| 93 | ({ register unsigned long int __v, __x = (x); \ | |
| 94 | if (__builtin_constant_p (x)) \ | |
| 95 | __v = __bswap_constant_64 (__x); \ | |
| 96 | else \ | |
| 97 | __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \ | |
| 98 | : "=r" (__v) \ | |
| 99 | : "r" ((unsigned long int) (__x))); \ | |
| 100 | __v; })) | |
| 101 | ||
| 102 | #else | |
| 103 | # define __bswap_constant_64(x) \ | |
| 104 | ((((x) & 0xff00000000000000ul) >> 56) \ | |
| 105 | | (((x) & 0x00ff000000000000ul) >> 40) \ | |
| 106 | | (((x) & 0x0000ff0000000000ul) >> 24) \ | |
| 107 | | (((x) & 0x000000ff00000000ul) >> 8) \ | |
| 108 | | (((x) & 0x00000000ff000000ul) << 8) \ | |
| 109 | | (((x) & 0x0000000000ff0000ul) << 24) \ | |
| 110 | | (((x) & 0x000000000000ff00ul) << 40) \ | |
| 111 | | (((x) & 0x00000000000000fful) << 56)) | |
| 112 | ||
| 113 | static __inline unsigned long int | |
| 114 | __bswap_64 (unsigned long int __bsx) | |
| 115 | { | |
| 116 | return __bswap_constant_64 (__bsx); | |
| 117 | } | |
| 118 | #endif | |
| 119 | ||
| 120 | #endif /* _BITS_BYTESWAP_H */ |