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diff --git a/src/math/bigint/mp_amd64/mp_asmi.h b/src/math/bigint/mp_amd64/mp_asmi.h
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+/*************************************************
+* Lowest Level MPI Algorithms Header File *
+* (C) 1999-2007 Jack Lloyd *
+* 2006 Luca Piccarreta *
+*************************************************/
+
+#ifndef BOTAN_MP_ASM_INTERNAL_H__
+#define BOTAN_MP_ASM_INTERNAL_H__
+
+#include <botan/mp_asm.h>
+
+namespace Botan {
+
+extern "C" {
+
+/*************************************************
+* Helper Macros for amd64 Assembly *
+*************************************************/
+#ifndef ASM
+ #define ASM(x) x "\n\t"
+#endif
+
+#define ADDSUB2_OP(OPERATION, INDEX) \
+ ASM("movq 8*" #INDEX "(%[y]), %[carry]") \
+ ASM(OPERATION " %[carry], 8*" #INDEX "(%[x])") \
+
+#define ADDSUB3_OP(OPERATION, INDEX) \
+ ASM("movq 8*" #INDEX "(%[x]), %[carry]") \
+ ASM(OPERATION " 8*" #INDEX "(%[y]), %[carry]") \
+ ASM("movq %[carry], 8*" #INDEX "(%[z])") \
+
+#define LINMUL_OP(WRITE_TO, INDEX) \
+ ASM("movq 8*" #INDEX "(%[x]),%%rax") \
+ ASM("mulq %[y]") \
+ ASM("addq %[carry],%%rax") \
+ ASM("adcq $0,%%rdx") \
+ ASM("movq %%rdx,%[carry]") \
+ ASM("movq %%rax, 8*" #INDEX "(%[" WRITE_TO "])")
+
+#define MULADD_OP(IGNORED, INDEX) \
+ ASM("movq 8*" #INDEX "(%[x]),%%rax") \
+ ASM("mulq %[y]") \
+ ASM("addq %[carry],%%rax") \
+ ASM("adcq $0,%%rdx") \
+ ASM("addq 8*" #INDEX "(%[z]),%%rax") \
+ ASM("adcq $0,%%rdx") \
+ ASM("movq %%rdx,%[carry]") \
+ ASM("movq %%rax, 8*" #INDEX " (%[z])")
+
+#define DO_8_TIMES(MACRO, ARG) \
+ MACRO(ARG, 0) \
+ MACRO(ARG, 1) \
+ MACRO(ARG, 2) \
+ MACRO(ARG, 3) \
+ MACRO(ARG, 4) \
+ MACRO(ARG, 5) \
+ MACRO(ARG, 6) \
+ MACRO(ARG, 7)
+
+#define ADD_OR_SUBTRACT(CORE_CODE) \
+ ASM("rorq %[carry]") \
+ CORE_CODE \
+ ASM("sbbq %[carry],%[carry]") \
+ ASM("negq %[carry]")
+
+/*************************************************
+* Word Addition *
+*************************************************/
+inline word word_add(word x, word y, word* carry)
+ {
+ asm(
+ ADD_OR_SUBTRACT(ASM("adcq %[y],%[x]"))
+ : [x]"=r"(x), [carry]"=r"(*carry)
+ : "0"(x), [y]"rm"(y), "1"(*carry)
+ : "cc");
+ return x;
+ }
+
+/*************************************************
+* Eight Word Block Addition, Two Argument *
+*************************************************/
+inline word word8_add2(word x[8], const word y[8], word carry)
+ {
+ asm(
+ ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB2_OP, "adcq"))
+ : [carry]"=r"(carry)
+ : [x]"r"(x), [y]"r"(y), "0"(carry)
+ : "cc", "memory");
+ 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)
+ {
+ asm(
+ ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB3_OP, "adcq"))
+ : [carry]"=r"(carry)
+ : [x]"r"(x), [y]"r"(y), [z]"r"(z), "0"(carry)
+ : "cc", "memory");
+ return carry;
+ }
+
+/*************************************************
+* Word Subtraction *
+*************************************************/
+inline word word_sub(word x, word y, word* carry)
+ {
+ asm(
+ ADD_OR_SUBTRACT(ASM("sbbq %[y],%[x]"))
+ : [x]"=r"(x), [carry]"=r"(*carry)
+ : "0"(x), [y]"rm"(y), "1"(*carry)
+ : "cc");
+ return x;
+ }
+
+/*************************************************
+* Eight Word Block Subtraction, Two Argument *
+*************************************************/
+inline word word8_sub2(word x[8], const word y[8], word carry)
+ {
+ asm(
+ ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB2_OP, "sbbq"))
+ : [carry]"=r"(carry)
+ : [x]"r"(x), [y]"r"(y), "0"(carry)
+ : "cc", "memory");
+ 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)
+ {
+ asm(
+ ADD_OR_SUBTRACT(DO_8_TIMES(ADDSUB3_OP, "sbbq"))
+ : [carry]"=r"(carry)
+ : [x]"r"(x), [y]"r"(y), [z]"r"(z), "0"(carry)
+ : "cc", "memory");
+ return carry;
+ }
+
+/*************************************************
+* Eight Word Block Linear Multiplication *
+*************************************************/
+inline word word8_linmul2(word x[8], word y, word carry)
+ {
+ asm(
+ DO_8_TIMES(LINMUL_OP, "x")
+ : [carry]"=r"(carry)
+ : [x]"r"(x), [y]"rm"(y), "0"(carry)
+ : "cc", "%rax", "%rdx");
+ return carry;
+ }
+
+/*************************************************
+* Eight Word Block Linear Multiplication *
+*************************************************/
+inline word word8_linmul3(word z[8], const word x[8], word y, word carry)
+ {
+ asm(
+ DO_8_TIMES(LINMUL_OP, "z")
+ : [carry]"=r"(carry)
+ : [z]"r"(z), [x]"r"(x), [y]"rm"(y), "0"(carry)
+ : "cc", "%rax", "%rdx");
+ return carry;
+ }
+
+/*************************************************
+* Eight Word Block Multiply/Add *
+*************************************************/
+inline word word8_madd3(word z[8], const word x[8], word y, word carry)
+ {
+ asm(
+ DO_8_TIMES(MULADD_OP, "")
+ : [carry]"=r"(carry)
+ : [z]"r"(z), [x]"r"(x), [y]"rm"(y), "0"(carry)
+ : "cc", "%rax", "%rdx");
+ return carry;
+ }
+
+/*************************************************
+* Multiply-Add Accumulator *
+*************************************************/
+inline void word3_muladd(word* w2, word* w1, word* w0, word x, word y)
+ {
+ asm(
+ ASM("mulq %[y]")
+
+ ASM("addq %[x],%[w0]")
+ ASM("adcq %[y],%[w1]")
+ ASM("adcq $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("mulq %[y]")
+
+ ASM("addq %[x],%[w0]")
+ ASM("adcq %[y],%[w1]")
+ ASM("adcq $0,%[w2]")
+
+ ASM("addq %[x],%[w0]")
+ ASM("adcq %[y],%[w1]")
+ ASM("adcq $0,%[w2]")
+
+ : [w0]"=r"(*w0), [w1]"=r"(*w1), [w2]"=r"(*w2)
+ : [x]"a"(x), [y]"d"(y), "0"(*w0), "1"(*w1), "2"(*w2)
+ : "cc");
+ }
+
+
+#undef ASM
+#undef DO_8_TIMES
+#undef ADD_OR_SUBTRACT
+#undef ADDSUB2_OP
+#undef ADDSUB3_OP
+#undef LINMUL_OP
+#undef MULADD_OP
+
+}
+
+}
+#endif
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