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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 != 32)
#error The mp_ia32 module requires that BOTAN_MP_WORD_BITS == 32
#endif
namespace Botan {
extern "C" {
/*************************************************
* Helper Macros for x86 Assembly *
*************************************************/
#define ASM(x) x "\n\t"
/*************************************************
* Word Multiply *
*************************************************/
inline word word_madd2(word a, word b, word c, word* carry)
{
asm(
ASM("mull %[b]")
ASM("addl %[c],%[a]")
ASM("adcl $0,%[carry]")
: [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*carry)
: "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, word* carry)
{
asm(
ASM("mull %[b]")
ASM("addl %[c],%[a]")
ASM("adcl $0,%[carry]")
ASM("addl %[d],%[a]")
ASM("adcl $0,%[carry]")
: [a]"=a"(a), [b]"=rm"(b), [carry]"=&d"(*carry)
: "0"(a), "1"(b), [c]"g"(c), [d]"g"(d) : "cc");
return a;
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd(word* w2, word* w1, word* w0, word x, word y)
{
asm(
ASM("mull %[y]")
ASM("addl %[x],%[w0]")
ASM("adcl %[y],%[w1]")
ASM("adcl $0,%[w2]")
: [w0]"=r"(*w0), [w1]"=r"(*w1), [w2]"=r"(*w2)
: [x]"a"(x), [y]"d"(y), "0"(*w0), "1"(*w1), "2"(*w2)
: "cc");
}
/*************************************************
* Multiply-Add Accumulator *
*************************************************/
inline void word3_muladd_2(word* w2, word* w1, word* w0, word x, word y)
{
asm(
ASM("mull %[y]")
ASM("addl %[x],%[w0]")
ASM("adcl %[y],%[w1]")
ASM("adcl $0,%[w2]")
ASM("addl %[x],%[w0]")
ASM("adcl %[y],%[w1]")
ASM("adcl $0,%[w2]")
: [w0]"=r"(*w0), [w1]"=r"(*w1), [w2]"=r"(*w2)
: [x]"a"(x), [y]"d"(y), "0"(*w0), "1"(*w1), "2"(*w2)
: "cc");
}
}
}
#endif
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