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/*
* Lowest Level MPI Algorithms
* (C) 1999-2008 Jack Lloyd
* 2006 Luca Piccarreta
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MP_WORD_MULADD_H__
#define BOTAN_MP_WORD_MULADD_H__
#include <botan/mp_types.h>
#if (BOTAN_MP_WORD_BITS != 64)
#error The mp_x86_64 module requires that BOTAN_MP_WORD_BITS == 64
#endif
namespace Botan {
/*
* Helper Macros for x86-64 Assembly
*/
#define ASM(x) x "\n\t"
/*
* Word Multiply
*/
inline word word_madd2(word a, word b, word* c)
{
asm(
ASM("mulq %[b]")
ASM("addq %[c],%[a]")
ASM("adcq $0,%[carry]")
: [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*c)
: "0"(a), "1"(b), [c]"g"(*c) : "cc");
return a;
}
/*
* Word Multiply/Add
*/
inline word word_madd3(word a, word b, word c, word* d)
{
asm(
ASM("mulq %[b]")
ASM("addq %[c],%[a]")
ASM("adcq $0,%[carry]")
ASM("addq %[d],%[a]")
ASM("adcq $0,%[carry]")
: [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*d)
: "0"(a), "1"(b), [c]"g"(c), [d]"g"(*d) : "cc");
return a;
}
#undef ASM
}
#endif
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