55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
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/* bithelp.h - Some bit manipulation helpers
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* Copyright (C) 1999, 2002 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser general Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifndef G10_BITHELP_H
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#define G10_BITHELP_H
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/****************
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* Rotate the 32 bit unsigned integer X by N bits left/right
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*/
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#if defined(__GNUC__) && defined(__i386__)
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static inline u32
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rol( u32 x, int n)
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{
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__asm__("roll %%cl,%0"
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:"=r" (x)
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:"0" (x),"c" (n));
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return x;
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}
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#else
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#define rol(x,n) ( ((x) << (n)) | ((x) >> (32-(n))) )
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#endif
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#if defined(__GNUC__) && defined(__i386__)
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static inline u32
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ror(u32 x, int n)
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{
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__asm__("rorl %%cl,%0"
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:"=r" (x)
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:"0" (x),"c" (n));
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return x;
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}
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#else
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#define ror(x,n) ( ((x) >> (n)) | ((x) << (32-(n))) )
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#endif
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#endif /*G10_BITHELP_H*/
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