diff options
Diffstat (limited to 'libc/sysdeps/linux/v850/bits/byteswap.h')
| -rw-r--r-- | libc/sysdeps/linux/v850/bits/byteswap.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/v850/bits/byteswap.h b/libc/sysdeps/linux/v850/bits/byteswap.h new file mode 100644 index 000000000..44fbee488 --- /dev/null +++ b/libc/sysdeps/linux/v850/bits/byteswap.h @@ -0,0 +1,63 @@ +/* + * libc/sysdeps/linux/v850/bits/byteswap.h -- Macros to swap the order + * of bytes in integer values + * + * Copyright (C) 2001 NEC Corporation + * Copyright (C) 2001 Miles Bader <miles@gnu.org> + * Copyright (C) 1997,1998,2001 Free Software Foundation, Inc. + * + * This file is subject to the terms and conditions of the GNU Lesser + * General Public License. See the file COPYING.LIB in the main + * directory of this archive for more details. + */ + +#if !defined _BYTESWAP_H && !defined _NETINET_IN_H +# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." +#endif + +/* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) + +#ifdef __GNUC__ +# define __bswap_16(x) \ + (__extension__ \ + ({ unsigned long int __bswap_16_v; \ + if (__builtin_constant_p (x)) \ + __bswap_16_v = __bswap_constant_16 (x); \ + else \ + __asm__ ("bsh %1, %0" : "=r" (__bswap_16_v) : "r" (x)); \ + __bswap_16_v; })) +#else +# define __bswap_16(x) __bswap_constant_16 (x) +#endif + +/* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ + ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ + (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) + +#ifdef __GNUC__ +# define __bswap_32(x) \ + (__extension__ \ + ({ unsigned long int __bswap_32_v; \ + if (__builtin_constant_p (x)) \ + __bswap_32_v = __bswap_constant_32 (x); \ + else \ + __asm__ ("bsw %1, %0" : "=r" (__bswap_32_v) : "r" (x)); \ + __bswap_32_v; })) +#else +# define __bswap_32(x) __bswap_constant_32 (x) +#endif + +#if defined __GNUC__ && __GNUC__ >= 2 +/* Swap bytes in 64 bit value. */ +# define __bswap_64(x) \ + (__extension__ \ + ({ union { unsigned long long int __ll; \ + unsigned long int __l[2]; } __bswap_64_v, __bswap_64_r; \ + __bswap_64_v.__ll = (x); \ + __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \ + __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \ + __bswap_64_r.__ll; })) +#endif |