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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