uclibc-ng/libc/sysdeps/linux/bfin/bits/byteswap.h

/* 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 */