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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_INTERNAL_H__
#define BOTAN_MP_ASM_INTERNAL_H__
#include <botan/mp_asm.h>
namespace Botan {
extern "C" {
/*
* Word Addition
*/
inline word word_add(word x, word y, word* carry)
{
word z = x + y;
word c1 = (z < x);
z += *carry;
*carry = c1 | (z < *carry);
return z;
}
/*
* Eight Word Block Addition, Two Argument
*/
inline word word8_add2(word x[8], const word y[8], word carry)
{
x[0] = word_add(x[0], y[0], &carry);
x[1] = word_add(x[1], y[1], &carry);
x[2] = word_add(x[2], y[2], &carry);
x[3] = word_add(x[3], y[3], &carry);
x[4] = word_add(x[4], y[4], &carry);
x[5] = word_add(x[5], y[5], &carry);
x[6] = word_add(x[6], y[6], &carry);
x[7] = word_add(x[7], y[7], &carry);
return carry;
}
/*
* Eight Word Block Addition, Three Argument
*/
inline word word8_add3(word z[8], const word x[8],
const word y[8], word carry)
{
z[0] = word_add(x[0], y[0], &carry);
z[1] = word_add(x[1], y[1], &carry);
z[2] = word_add(x[2], y[2], &carry);
z[3] = word_add(x[3], y[3], &carry);
z[4] = word_add(x[4], y[4], &carry);
z[5] = word_add(x[5], y[5], &carry);
z[6] = word_add(x[6], y[6], &carry);
z[7] = word_add(x[7], y[7], &carry);
return carry;
}
/*
* Word Subtraction
*/
inline word word_sub(word x, word y, word* carry)
{
word t0 = x - y;
word c1 = (t0 > x);
word z = t0 - *carry;
*carry = c1 | (z > t0);
return z;
}
/*
* Eight Word Block Subtraction, Two Argument
*/
inline word word8_sub2(word x[4], const word y[4], word carry)
{
x[0] = word_sub(x[0], y[0], &carry);
x[1] = word_sub(x[1], y[1], &carry);
x[2] = word_sub(x[2], y[2], &carry);
x[3] = word_sub(x[3], y[3], &carry);
x[4] = word_sub(x[4], y[4], &carry);
x[5] = word_sub(x[5], y[5], &carry);
x[6] = word_sub(x[6], y[6], &carry);
x[7] = word_sub(x[7], y[7], &carry);
return carry;
}
/*
* Eight Word Block Subtraction, Three Argument
*/
inline word word8_sub3(word z[8], const word x[8],
const word y[8], word carry)
{
z[0] = word_sub(x[0], y[0], &carry);
z[1] = word_sub(x[1], y[1], &carry);
z[2] = word_sub(x[2], y[2], &carry);
z[3] = word_sub(x[3], y[3], &carry);
z[4] = word_sub(x[4], y[4], &carry);
z[5] = word_sub(x[5], y[5], &carry);
z[6] = word_sub(x[6], y[6], &carry);
z[7] = word_sub(x[7], y[7], &carry);
return carry;
}
/*
* Eight Word Block Linear Multiplication
*/
inline word word8_linmul2(word x[4], word y, word carry)
{
x[0] = word_madd2(x[0], y, &carry);
x[1] = word_madd2(x[1], y, &carry);
x[2] = word_madd2(x[2], y, &carry);
x[3] = word_madd2(x[3], y, &carry);
x[4] = word_madd2(x[4], y, &carry);
x[5] = word_madd2(x[5], y, &carry);
x[6] = word_madd2(x[6], y, &carry);
x[7] = word_madd2(x[7], y, &carry);
return carry;
}
/*
* Eight Word Block Linear Multiplication
*/
inline word word8_linmul3(word z[8], const word x[8], word y, word carry)
{
z[0] = word_madd2(x[0], y, &carry);
z[1] = word_madd2(x[1], y, &carry);
z[2] = word_madd2(x[2], y, &carry);
z[3] = word_madd2(x[3], y, &carry);
z[4] = word_madd2(x[4], y, &carry);
z[5] = word_madd2(x[5], y, &carry);
z[6] = word_madd2(x[6], y, &carry);
z[7] = word_madd2(x[7], y, &carry);
return carry;
}
/*
* Eight Word Block Multiply/Add
*/
inline word word8_madd3(word z[8], const word x[8], word y, word carry)
{
z[0] = word_madd3(x[0], y, z[0], &carry);
z[1] = word_madd3(x[1], y, z[1], &carry);
z[2] = word_madd3(x[2], y, z[2], &carry);
z[3] = word_madd3(x[3], y, z[3], &carry);
z[4] = word_madd3(x[4], y, z[4], &carry);
z[5] = word_madd3(x[5], y, z[5], &carry);
z[6] = word_madd3(x[6], y, z[6], &carry);
z[7] = word_madd3(x[7], y, z[7], &carry);
return carry;
}
/*
* Multiply-Add Accumulator
*/
inline void word3_muladd(word* w2, word* w1, word* w0, word a, word b)
{
word carry = *w0;
*w0 = word_madd2(a, b, &carry);
*w1 += carry;
*w2 += (*w1 < carry) ? 1 : 0;
}
/*
* Multiply-Add Accumulator
*/
inline void word3_muladd_2(word* w2, word* w1, word* w0, word a, word b)
{
word carry = 0;
a = word_madd2(a, b, &carry);
b = carry;
word top = (b >> (BOTAN_MP_WORD_BITS-1));
b <<= 1;
b |= (a >> (BOTAN_MP_WORD_BITS-1));
a <<= 1;
carry = 0;
*w0 = word_add(*w0, a, &carry);
*w1 = word_add(*w1, b, &carry);
*w2 = word_add(*w2, top, &carry);
}
}
}
#endif
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