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/*************************************************
* MPI Multiply-Add Core Header File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#ifndef BOTAN_MP_MADD_H__
#define BOTAN_MP_MADD_H__
#include <botan/mp_types.h>
#if (BOTAN_MP_WORD_BITS != 64)
#error The mp_asm64 module requires that BOTAN_MP_WORD_BITS == 64
#endif
#if defined(BOTAN_TARGET_ARCH_IS_ALPHA)
#define BOTAN_WORD_MUL(a,b,z1,z0) do { \
asm("umulh %1,%2,%0" : "=r" (z0) : "r" (a), "r" (b)); \
z1 = a * b; \
} while(0);
#elif defined(BOTAN_TARGET_ARCH_IS_IA64)
#define BOTAN_WORD_MUL(a,b,z1,z0) do { \
asm("xmpy.hu %0=%1,%2" : "=f" (z0) : "f" (a), "f" (b)); \
z1 = a * b; \
} while(0);
#elif defined(BOTAN_TARGET_ARCH_IS_PPC64)
#define BOTAN_WORD_MUL(a,b,z1,z0) do { \
asm("mulhdu %0,%1,%2" : "=r" (z0) : "r" (a), "r" (b) : "cc"); \
z1 = a * b; \
} while(0);
#elif defined(BOTAN_TARGET_ARCH_IS_MIPS64)
#define BOTAN_WORD_MUL(a,b,z1,z0) do { \
asm("dmultu %2,%3" : "=h" (z0), "=l" (z1) : "r" (a), "r" (b)); \
} while(0);
#else
#include <botan/mp_core.h>
#define BOTAN_WORD_MUL(a,b,z1,z0) \
do { bigint_wordmul(a, b, &z1, &z0); } while(0);
#endif
namespace Botan {
/*************************************************
* Word Multiply/Add *
*************************************************/
inline word word_madd2(word a, word b, word c, word* carry)
{
word z0 = 0, z1 = 0;
BOTAN_WORD_MUL(a, b, z1, z0);
z1 += c; if(z1 < c) z0++;
*carry = z0;
return z1;
}
/*************************************************
* Word Multiply/Add *
*************************************************/
inline word word_madd3(word a, word b, word c, word d, word* carry)
{
word z0 = 0, z1 = 0;
BOTAN_WORD_MUL(a, b, z1, z0);
z1 += c; if(z1 < c) z0++;
z1 += d; if(z1 < d) z0++;
*carry = z0;
return z1;
}
}
#endif
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