glibc/sysdeps/i386/bits/byteswap.h

/* Macros to swap the order of bytes in integer values.
   Copyright (C) 1997, 1998, 2000, 2002 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#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) & 0xff) | (((x) & 0xff) << 8))

#if defined __GNUC__ && __GNUC__ >= 2
# define __bswap_16(x) \
     (__extension__							      \
      ({ register unsigned short int __v, __x = (x);			      \
	 if (__builtin_constant_p (__x))				      \
	   __v = __bswap_constant_16 (__x);				      \
	 else								      \
	   __asm__ ("rorw $8, %w0"					      \
		    : "=r" (__v)					      \
 		    : "0" (__x)						      \
 		    : "cc");						      \
	 __v; }))
#else
/* This is better than nothing.  */
# define __bswap_16(x) \
     (__extension__							      \
      ({ register unsigned short int __x = (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))

#if defined __GNUC__ && __GNUC__ >= 2
/* To swap the bytes in a word the i486 processors and up provide the
   `bswap' opcode.  On i386 we have to use three instructions.  */
# if !defined __i486__ && !defined __pentium__ && !defined __pentiumpro__
#  define __bswap_32(x)							      \
     (__extension__							      \
      ({ register unsigned int __v, __x = (x);				      \
	 if (__builtin_constant_p (__x))				      \
	   __v = __bswap_constant_32 (__x);				      \
	 else								      \
	   __asm__ ("rorw $8, %w0;"					      \
		    "rorl $16, %0;"					      \
		    "rorw $8, %w0"					      \
		    : "=r" (__v)					      \
		    : "0" (__x)						      \
		    : "cc");						      \
	 __v; }))
# else
#  define __bswap_32(x) \
     (__extension__							      \
      ({ register unsigned int __v, __x = (x);				      \
	 if (__builtin_constant_p (__x))				      \
	   __v = __bswap_constant_32 (__x);				      \
	 else								      \
	   __asm__ ("bswap %0" : "=r" (__v) : "0" (__x));		      \
	 __v; }))
# endif
#else
# define __bswap_16(x) \
     (__extension__							      \
      ({ register unsigned int __x = (x); __bswap_constant_32 (__x); }))
#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 long int __l[2]; } __w, __r;			      \
	 __w.__ll = (x);						      \
         if (__builtin_constant_p (__w.__ll))				      \
	   __r.__ll = __bswap_constant_64 (__w.__ll);			      \
	 else								      \
	   {								      \
	     __r.__l[0] = __bswap_32 (__w.__l[1]);			      \
	     __r.__l[1] = __bswap_32 (__w.__l[0]);			      \
	   }								      \
	 __r.__ll; }))
#endif

#endif /* _BITS_BYTESWAP_H */