diff options
Diffstat (limited to 'libc/sysdeps/linux/common/bits/byteswap-common.h')
| -rw-r--r-- | libc/sysdeps/linux/common/bits/byteswap-common.h | 109 |
1 files changed, 57 insertions, 52 deletions
diff --git a/libc/sysdeps/linux/common/bits/byteswap-common.h b/libc/sysdeps/linux/common/bits/byteswap-common.h index 4941d4768..0effea689 100644 --- a/libc/sysdeps/linux/common/bits/byteswap-common.h +++ b/libc/sysdeps/linux/common/bits/byteswap-common.h @@ -1,5 +1,5 @@ /* Macros to swap the order of bytes in integer values. - Copyright (C) 1997,1998,2000,2001,2002,2005 Free Software Foundation, Inc. + Copyright (C) 1997-2016 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 @@ -16,54 +16,40 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#if !defined _BYTESWAP_H && !defined _NETINET_IN_H +#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) \ - ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) + ((unsigned short int)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))) -#ifndef __bswap_non_constant_16 -# define __bswap_non_constant_16(x) __bswap_constant_16(x) -#endif -#ifdef __GNUC__ -# define __bswap_16(x) \ - (__extension__ \ - ({ unsigned short int __bsv, __bsx = (x); \ - if (__builtin_constant_p (__bsx)) \ - __bsv = __bswap_constant_16 (__bsx); \ - else \ - __bsv = __bswap_non_constant_16 (__bsx); \ - __bsv; })) -#else -static __inline unsigned short int -__bswap_16 (unsigned short int __bsx) -{ - return __bswap_constant_16 (__bsx); -} -#endif +/* 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)) -#ifndef __bswap_non_constant_32 -# define __bswap_non_constant_32(x) __bswap_constant_32(x) -#endif #ifdef __GNUC__ -# define __bswap_32(x) \ - (__extension__ \ - ({ unsigned int __bsv, __bsx = (x); \ - if (__builtin_constant_p (__bsx)) \ - __bsv = __bswap_constant_32 (__bsx); \ - else \ - __bsv = __bswap_non_constant_32 (__bsx); \ - __bsv; })) +# 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) @@ -72,8 +58,40 @@ __bswap_32 (unsigned int __bsx) } #endif -#if defined __GNUC__ && __GNUC__ >= 2 /* 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) \ @@ -84,24 +102,11 @@ __bswap_32 (unsigned int __bsx) | (((x) & 0x000000000000ff00ull) << 40) \ | (((x) & 0x00000000000000ffull) << 56)) -# ifndef __bswap_non_constant_64 -# define __bswap_non_constant_64(x) \ - (__extension__ \ - ({ union { __extension__ unsigned long long int __ll; \ - unsigned int __l[2]; } __w, __r; \ - __w.__ll = (x); \ - __r.__l[0] = __bswap_non_constant_32 (__w.__l[1]); \ - __r.__l[1] = __bswap_non_constant_32 (__w.__l[0]); \ - __r.__ll; })) -# endif -# define __bswap_64(x) \ - (__extension__ \ - ({ __extension__ unsigned long long int __ll; \ - if (__builtin_constant_p (x)) \ - __ll = __bswap_constant_64 (x); \ - else \ - __ll = __bswap_non_constant_64 (x); \ - __ll; })) +static __inline __uint64_t +__bswap_64 (__uint64_t __bsx) +{ + return __bswap_constant_64 (__bsx); +} #endif #endif /* _BITS_BYTESWAP_H */ |