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/*************************************************
* Lowest Level MPI Algorithms Header File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#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, word* carry)
{
dword z = (dword)a * b + c;
*carry = (word)(z >> BOTAN_MP_WORD_BITS);
return (word)z;
}
/*************************************************
* Word Multiply/Add *
*************************************************/
inline word word_madd3(word a, word b, word c, word d, word* carry)
{
dword z = (dword)a * b + c + d;
*carry = (word)(z >> BOTAN_MP_WORD_BITS);
return (word)z;
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd(word* w2, word* w1, word* w0, word a, word b)
{
*w0 = word_madd2(a, b, *w0, &a);
*w1 += a;
*w2 += (*w1 < a) ? 1 : 0;
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd_2(word* w2, word* w1, word* w0, word a, word b)
{
a = word_madd2(a, b, 0, &b);
*w0 += a;
*w1 += b + ((*w0 < a) ? 1 : 0);
*w2 += (*w1 < b) ? 1 : 0;
*w0 += a;
*w1 += b + ((*w0 < a) ? 1 : 0);
*w2 += (*w1 < b) ? 1 : 0;
}
}
}
#endif
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