lib/libgcrypt/cipher/bithelp.h

   1 /* bithelp.h  -  Some bit manipulation helpers
   2  *      Copyright (C) 1999, 2002 Free Software Foundation, Inc.
   3  *
   4  * This file is part of Libgcrypt.
   5  *
   6  * Libgcrypt is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser general Public License as
   8  * published by the Free Software Foundation; either version 2.1 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * Libgcrypt is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  19  */
  20 #ifndef G10_BITHELP_H
  21 #define G10_BITHELP_H
  22
  23
  24 /****************
  25  * Rotate the 32 bit unsigned integer X by N bits left/right
  26  */
  27 #if defined(__GNUC__) && defined(__i386__)
  28 static inline u32
  29 rol( u32 x, int n)
  30 {
  31         __asm__("roll %%cl,%0"
  32                 :"=r" (x)
  33                 :"0" (x),"c" (n));
  34         return x;
  35 }
  36 #else
  37 #define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
  38 #endif
  39
  40 #if defined(__GNUC__) && defined(__i386__)
  41 static inline u32
  42 ror(u32 x, int n)
  43 {
  44         __asm__("rorl %%cl,%0"
  45                 :"=r" (x)
  46                 :"0" (x),"c" (n));
  47         return x;
  48 }
  49 #else
  50 #define ror(x,n) ( ((x) >> (n)) | ((x) << (32-(n))) )
  51 #endif
  52
  53
  54 #endif /*G10_BITHELP_H*/