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Diffstat (limited to 'REORG.TODO/bits/byteswap.h')
| -rw-r--r-- | REORG.TODO/bits/byteswap.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/REORG.TODO/bits/byteswap.h b/REORG.TODO/bits/byteswap.h new file mode 100644 index 0000000000..a9f903be82 --- /dev/null +++ b/REORG.TODO/bits/byteswap.h @@ -0,0 +1,112 @@ +/* Macros to swap the order of bytes in integer values. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H +# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." +#endif + +#ifndef _BITS_BYTESWAP_H +#define _BITS_BYTESWAP_H 1 + +#include <features.h> +#include <bits/types.h> + +/* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((unsigned short int)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))) + +/* Get __bswap_16. */ +#include <bits/byteswap-16.h> + +/* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ + ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ + (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) + +#ifdef __GNUC__ +# if __GNUC_PREREQ (4, 3) +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __builtin_bswap32 (__bsx); +} +# else +# define __bswap_32(x) \ + (__extension__ \ + ({ unsigned int __bsx = (x); __bswap_constant_32 (__bsx); })) +# endif +#else +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __bswap_constant_32 (__bsx); +} +#endif + +/* Swap bytes in 64 bit value. */ +#if __GNUC_PREREQ (2, 0) +# define __bswap_constant_64(x) \ + (__extension__ ((((x) & 0xff00000000000000ull) >> 56) \ + | (((x) & 0x00ff000000000000ull) >> 40) \ + | (((x) & 0x0000ff0000000000ull) >> 24) \ + | (((x) & 0x000000ff00000000ull) >> 8) \ + | (((x) & 0x00000000ff000000ull) << 8) \ + | (((x) & 0x0000000000ff0000ull) << 24) \ + | (((x) & 0x000000000000ff00ull) << 40) \ + | (((x) & 0x00000000000000ffull) << 56))) + +# if __GNUC_PREREQ (4, 3) +static __inline __uint64_t +__bswap_64 (__uint64_t __bsx) +{ + return __builtin_bswap64 (__bsx); +} +# else +# define __bswap_64(x) \ + (__extension__ \ + ({ union { __extension__ __uint64_t __ll; \ + unsigned int __l[2]; } __w, __r; \ + if (__builtin_constant_p (x)) \ + __r.__ll = __bswap_constant_64 (x); \ + else \ + { \ + __w.__ll = (x); \ + __r.__l[0] = __bswap_32 (__w.__l[1]); \ + __r.__l[1] = __bswap_32 (__w.__l[0]); \ + } \ + __r.__ll; })) +# endif +#else +# define __bswap_constant_64(x) \ + ((((x) & 0xff00000000000000ull) >> 56) \ + | (((x) & 0x00ff000000000000ull) >> 40) \ + | (((x) & 0x0000ff0000000000ull) >> 24) \ + | (((x) & 0x000000ff00000000ull) >> 8) \ + | (((x) & 0x00000000ff000000ull) << 8) \ + | (((x) & 0x0000000000ff0000ull) << 24) \ + | (((x) & 0x000000000000ff00ull) << 40) \ + | (((x) & 0x00000000000000ffull) << 56)) + +static __inline __uint64_t +__bswap_64 (__uint64_t __bsx) +{ + return __bswap_constant_64 (__bsx); +} +#endif + +#endif /* _BITS_BYTESWAP_H */ |