text: /* Macros to swap the order of bytes in integer values.
     Copyright (C) 1997, 1998, 2000, 2001, 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.  */
  
  /* Modified by Phil Carns (pcarns@parl.clemson.edu) 
   * June 2003
   * For use with custom network encoding routines in the BMI component of 
   * the Parallel Virtual File System version 2.
   */
  
  #ifndef __BMI_BYTESWAP_H
  #define __BMI_BYTESWAP_H 
  
  #include "pvfs2-internal.h"
  
  #ifndef __bswap_16
  /* Swap bytes in 16 bit value.  */
  #ifdef __GNUC__
  # define __bswap_16(x) \
      (__extension__							      \
       ({ unsigned short int __bsx = (x);					      \
          ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); }))
  #else
  static __inline unsigned short int
  __bswap_16 (unsigned short int __bsx)
  {
    return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
  }
  #endif
  #endif
  
  #ifndef __bswap_32
  /* Swap bytes in 32 bit value.  */
  #ifdef __GNUC__
  # define __bswap_32(x) \
      (__extension__							      \
       ({ unsigned int __bsx = (x);					      \
          ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >>  8) |    \
  	 (((__bsx) & 0x0000ff00) <<  8) | (((__bsx) & 0x000000ff) << 24)); }))
  #else
  static __inline unsigned int
  __bswap_32 (unsigned int __bsx)
  {
    return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >>  8) |
  	  (((__bsx) & 0x0000ff00) <<  8) | (((__bsx) & 0x000000ff) << 24));
  }
  #endif
  #endif
  
  #ifndef __bswap_64
  #if defined __GNUC__ && __GNUC__ >= 2
  /* Swap bytes in 64 bit value.  */
  #ifndef __bswap_constant_64
  # 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))
  #endif
  
  #ifndef BSWAP_64_IS_A_FUNC
  # 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
  #else
  #ifdef WORDS_BIGENDIAN
  #error FIX ME: no 64 bit bswap routine for non GNUC preprocessor.
  #endif
  #endif
  #endif 
  
  #ifdef WORDS_BIGENDIAN
  #define htobmi16(x) __bswap_16(x)
  #define htobmi32(x) __bswap_32(x)
  #define htobmi64(x) __bswap_64(x)
  #else
  #define htobmi16(x) x
  #define htobmi32(x) x
  #define htobmi64(x) x
  #endif
  
  #define bmitoh16(x) htobmi16(x) 
  #define bmitoh32(x) htobmi32(x)
  #define bmitoh64(x) htobmi64(x)
  
  #endif /* __BMI_BYTESWAP_H */
  
  