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/* bithelp.h - Some bit manipulation helpers
* Copyright (C) 1999, 2002 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef G10_BITHELP_H
#define G10_BITHELP_H
/****************
* Rotate the 32 bit unsigned integer X by N bits left/right
*/
#if defined(__GNUC__) && defined(__i386__)
static inline u32
rol( u32 x, int n)
{
__asm__("roll %%cl,%0"
:"=r" (x)
:"0" (x),"c" (n));
return x;
}
#else
#define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
#endif
#if defined(__GNUC__) && defined(__i386__)
static inline u32
ror(u32 x, int n)
{
__asm__("rorl %%cl,%0"
:"=r" (x)
:"0" (x),"c" (n));
return x;
}
#else
#define ror(x,n) ( ((x) >> (n)) | ((x) << (32-(n))) )
#endif
#endif /*G10_BITHELP_H*/
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