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/*************************************************
* Lowest Level MPI Algorithms Header File *
* (C) 1999-2006 Jack Lloyd *
* 2006 Luca Piccarreta *
*************************************************/
#ifndef BOTAN_MP_ASM_INTERNAL_H__
#define BOTAN_MP_ASM_INTERNAL_H__
#include "mp_asm.h"
#if (BOTAN_MP_WORD_BITS != 32)
#error BOTAN_MP_WORD_BITS must be 32 for x86 asm
#endif
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;
}
/*************************************************
* Four Word Block Addition, Two Argument *
*************************************************/
inline word word4_add2(word x[4], const word y[4], word carry)
{
__asm {
mov esi,[y]
mov edi,[x]
xor ecx,ecx
sub ecx,[carry] //force CF=1 iff *carry==1
mov eax,[edi]
mov ecx,[edi+4]
adc eax,[esi]
adc ecx,[esi+4]
mov [edi],eax
mov [edi+4],ecx
mov eax,[edi+8]
mov ecx,[edi+12]
adc eax,[esi+8]
adc ecx,[esi+12]
mov [edi+8],eax
mov [edi+12],ecx
sbb edx,edx
neg edx
mov eax,edx
}
}
/*************************************************
* Four Word Block Addition, Three Argument *
*************************************************/
inline word word4_add3(word z[4], const word x[4], const word y[4], word carry)
{
__asm {
mov esi,[y]
mov edi,[x]
xor ecx,ecx
sub ecx,[carry] //force CF=1 iff *carry==1
mov ebx,[z]
mov eax,[edi]
mov ecx,[edi+4]
adc eax,[esi]
adc ecx,[esi+4]
mov [ebx],eax
mov [ebx+4],ecx
mov eax,[edi+8]
mov ecx,[edi+12]
adc eax,[esi+8]
adc ecx,[esi+12]
mov [ebx+8],eax
mov [ebx+12],ecx
sbb edx,edx
neg edx
mov eax,edx
}
}
/*************************************************
* 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;
}
/*************************************************
* Four Word Block Subtraction, Two Argument *
*************************************************/
inline word word4_sub2(word x[4], const word y[4], word carry)
{
_asm {
mov esi,[y]
mov edi,[x]
xor ecx,ecx
sub ecx,[carry] //force CF=1 iff *carry==1
mov eax,[edi]
mov ecx,[edi+4]
sbb eax,[esi]
sbb ecx,[esi+4]
mov [edi],eax
mov [edi+4],ecx
mov eax,[edi+8]
mov ecx,[edi+12]
sbb eax,[esi+8]
sbb ecx,[esi+12]
mov [edi+8],eax
mov [edi+12],ecx
sbb edx,edx
neg edx
mov eax,edx
}
}
/*************************************************
* Four Word Block Subtraction, Three Argument *
*************************************************/
inline word word4_sub3(word z[4], const word x[4],const word y[4], word carry)
{
__asm {
mov esi,[y]
mov edi,[x]
xor ecx,ecx
sub ecx,[carry] //force CF=1 iff *carry==1
mov ebx,[z]
mov eax,[edi]
mov ecx,[edi+4]
sbb eax,[esi]
sbb ecx,[esi+4]
mov [ebx],eax
mov [ebx+4],ecx
mov eax,[edi+8]
mov ecx,[edi+12]
sbb eax,[esi+8]
sbb ecx,[esi+12]
mov [ebx+8],eax
mov [ebx+12],ecx
sbb edx,edx
neg edx
mov eax,edx
}
}
/*************************************************
* Four Word Block Linear Multiplication *
*************************************************/
inline word word4_linmul2(word x[4], word y, word carry)
{
__asm
{
mov esi,[x]
mov eax,[esi] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,[carry] //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [esi],eax //load a
mov eax,[esi+4] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [esi+4],eax //load a
mov eax,[esi+8] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [esi+8],eax //load a
mov eax,[esi+12] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov [esi+12],eax //load a
mov eax,edx //store carry
}
}
/*************************************************
* Four Word Block Linear Multiplication *
*************************************************/
inline word word4_linmul3(word z[4], const word x[4], word y, word carry)
{
__asm
{
mov edi,[z]
mov esi,[x]
mov eax,[esi] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,[carry] //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [edi],eax //load a
mov eax,[esi+4] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [edi+4],eax //load a
mov eax,[esi+8] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov ecx,edx //store carry
mov [edi+8],eax //load a
mov eax,[esi+12] //load a
mul [y] //edx(hi):eax(lo)=a*b
add eax,ecx //sum lo carry
adc edx,0 //sum hi carry
mov [edi+12],eax //load a
mov eax,edx //store carry
}
}
/*************************************************
* Eight Word Block Multiply-Add *
*************************************************/
inline void word8_madd3(word z[], word x, const word y[], word* carry)
{
word_madd(x, y[0], z[0], *carry, z + 0, carry);
word_madd(x, y[1], z[1], *carry, z + 1, carry);
word_madd(x, y[2], z[2], *carry, z + 2, carry);
word_madd(x, y[3], z[3], *carry, z + 3, carry);
word_madd(x, y[4], z[4], *carry, z + 4, carry);
word_madd(x, y[5], z[5], *carry, z + 5, carry);
word_madd(x, y[6], z[6], *carry, z + 6, carry);
word_madd(x, y[7], z[7], *carry, z + 7, carry);
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd(word* w2, word* w1, word* w0, word a, word b)
{
dword z = (dword)a * b + (*w0);
*w0 = (word)z; //lo
word t1 = (word)(z >> BOTAN_MP_WORD_BITS); //hi
*w1 += t1; //w1+=lo
*w2 += (*w1 < t1) ? 1 : 0; //w2+=carry
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd_2(word* w2, word* w1, word* w0, word a, word b)
{
dword z = (dword)a * b;
word t0 = (word)z;
word t1 = (word)(z >> BOTAN_MP_WORD_BITS);
*w0 += t0;
*w1 += t1 + ((*w0 < t0) ? 1 : 0);
*w2 += (*w1 < t1) ? 1 : 0;
*w0 += t0;
*w1 += t1 + ((*w0 < t0) ? 1 : 0);
*w2 += (*w1 < t1) ? 1 : 0;
}
}
}
#endif
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