mp_asm.h

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/*
* Lowest Level MPI Algorithms
* (C) 1999-2008 Jack Lloyd
*     2006 Luca Piccarreta
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_MP_ASM_H__
#define BOTAN_MP_ASM_H__
 
#include <botan/mp_types.h>
 
#if (BOTAN_MP_WORD_BITS == 8)
  typedef Botan::u16bit dword;
#elif (BOTAN_MP_WORD_BITS == 16)
  typedef Botan::u32bit dword;
#elif (BOTAN_MP_WORD_BITS == 32)
  typedef Botan::u64bit dword;
#elif (BOTAN_MP_WORD_BITS == 64)
  #error BOTAN_MP_WORD_BITS can be 64 only with assembly support
#else
  #error BOTAN_MP_WORD_BITS must be 8, 16, 32, or 64
#endif
 
namespace Botan {
 
extern "C" {
 
/*
* Word Multiply/Add
*/
inline word word_madd2(word a, word b, word* c)
   {
   dword z = (dword)a * b + *c;
   *c = (word)(z >> BOTAN_MP_WORD_BITS);
   return (word)z;
   }
 
/*
* Word Multiply/Add
*/
inline word word_madd3(word a, word b, word c, word* d)
   {
   dword z = (dword)a * b + c + *d;
   *d = (word)(z >> BOTAN_MP_WORD_BITS);
   return (word)z;
   }
 
}
 
}
 
#endif