1 files changed, 122 insertions, 0 deletions
diff --git a/src/math/mp/mp_asm64/mp_asm.h b/src/math/mp/mp_asm64/mp_asm.h
new file mode 100644
index 000000000..b0906095d
--- /dev/null
+++ b/src/math/mp/mp_asm64/mp_asm.h
@@ -0,0 +1,122 @@
+/*
+* MPI Multiply-Add Core
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_MP_MADD_H__
+#define BOTAN_MP_MADD_H__
+
+#include <botan/mp_types.h>
+
+namespace Botan {
+
+#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_AMD64)
+
+#define BOTAN_WORD_MUL(a,b,z1,z0) do {       \
+   asm("mulq %3" : "=d" (z0), "=a" (z1) :    \
+       "a" (a), "rm" (b) : "cc");            \
+} 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 {                            \
+   typedef unsigned int uint128_t __attribute__((mode(TI)));      \
+   uint128_t r = (uint128_t)a * b;                                \
+   z0 = (r >> 64) & 0xFFFFFFFFFFFFFFFF;                           \
+   z1 = (r      ) & 0xFFFFFFFFFFFFFFFF;                           \
+} while(0);
+
+#else
+
+// Do a 64x64->128 multiply using four 64x64->64 multiplies
+// plus some adds and shifts. Last resort for CPUs like UltraSPARC,
+// with 64-bit registers/ALU, but no 64x64->128 multiply.
+inline void bigint_2word_mul(word a, word b, word* z1, word* z0)
+   {
+   const u32bit MP_HWORD_BITS = BOTAN_MP_WORD_BITS / 2;
+   const word MP_HWORD_MASK = ((word)1 << MP_HWORD_BITS) - 1;
+
+   const word a_hi = (a >> MP_HWORD_BITS);
+   const word a_lo = (a & MP_HWORD_MASK);
+   const word b_hi = (b >> MP_HWORD_BITS);
+   const word b_lo = (b & MP_HWORD_MASK);
+
+   word x0 = a_hi * b_hi;
+   word x1 = a_lo * b_hi;
+   word x2 = a_hi * b_lo;
+   word x3 = a_lo * b_lo;
+
+   x2 += x3 >> (MP_HWORD_BITS);
+   x2 += x1;
+   if(x2 < x1)
+      x0 += ((word)1 << MP_HWORD_BITS);
+
+   *z0 = x0 + (x2 >> MP_HWORD_BITS);
+   *z1 = ((x2 & MP_HWORD_MASK) << MP_HWORD_BITS) + (x3 & MP_HWORD_MASK);
+   }
+
+#define BOTAN_WORD_MUL(a,b,z1,z0) bigint_2word_mul(a, b, &z1, &z0)
+
+#endif
+
+/*
+* Word Multiply/Add
+*/
+inline word word_madd2(word a, word b, word* c)
+   {
+   word z0 = 0, z1 = 0;
+
+   BOTAN_WORD_MUL(a, b, z1, z0);
+
+   z1 += *c; if(z1 < *c) z0++;
+
+   *c = z0;
+   return z1;
+   }
+
+/*
+* Word Multiply/Add
+*/
+inline word word_madd3(word a, word b, word c, word* d)
+   {
+   word z0 = 0, z1 = 0;
+
+   BOTAN_WORD_MUL(a, b, z1, z0);
+
+   z1 += c; if(z1 < c) z0++;
+   z1 += *d; if(z1 < *d) z0++;
+
+   *d = z0;
+   return z1;
+   }
+
+}
+
+#endif