diff options
| -rw-r--r-- | libc/sysdeps/linux/bfin/bits/byteswap.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/bfin/bits/byteswap.h b/libc/sysdeps/linux/bfin/bits/byteswap.h new file mode 100644 index 000000000..de6862236 --- /dev/null +++ b/libc/sysdeps/linux/bfin/bits/byteswap.h @@ -0,0 +1,93 @@ +/* File: libc/sysdeps/linux/bfin/bits/byteswap.h + * + * Copyright 2004-2006 Analog Devices Inc. + * + * Enter bugs at http://blackfin.uclinux.org/ + * + * Licensed under the GPL-2 or later. + */ + +#if !defined _BYTESWAP_H && !defined _NETINET_IN_H +# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." +#endif + +#ifndef _BITS_BYTESWAP_H +#define _BITS_BYTESWAP_H 1 + +/* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) + +#ifdef __GNUC__ +# define __bswap_16(x) \ + (__extension__ \ + ({ register unsigned short int __v, __x = (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_16 (__x); \ + else \ + __asm__ ("%0 <<= 8;" \ + "%1.L = %0.L + %0.H (NS);" \ + : "+d" (__x), "=d" (__v)); \ + __v; })) +#else +static __inline unsigned short int +__bswap_16 (unsigned short int __bsx) +{ + return __bswap_constant_16 (__bsx); +} +#endif + +/* 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__ +# define __bswap_32(x) \ + (__extension__ \ + ({ register unsigned int __v, __x = (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_32 (__x); \ + else \ + __asm__ ("%1 = %0 >> 8 (V);" \ + "%0 = %0 << 8 (V);" \ + "%0 = %0 | %1;" \ + "%1 = PACK(%0.L, %0.H);" \ + : "+d"(__x), "=&d"(__v)); \ + __v; })) +#else +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __bswap_constant_32 (__bsx); +} +#endif + +#if defined __GNUC__ && __GNUC__ >= 2 +/* Swap bytes in 64 bit value. */ +# 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)) + +# define __bswap_64(x) \ + (__extension__ \ + ({ union { __extension__ unsigned long long int __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 + +#endif /* _BITS_BYTESWAP_H */ |