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diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/copyd.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/copyd.asm
new file mode 100644
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+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86_64/copyd.asm
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+dnl AMD64 mpn_copyd -- copy limb vector, decrementing.
+
+dnl Copyright 2003, 2005, 2007, 2011, 2012 Free Software Foundation, Inc.
+
+dnl This file is part of the GNU MP Library.
+dnl
+dnl The GNU MP Library is free software; you can redistribute it and/or modify
+dnl it under the terms of either:
+dnl
+dnl * the GNU Lesser General Public License as published by the Free
+dnl Software Foundation; either version 3 of the License, or (at your
+dnl option) any later version.
+dnl
+dnl or
+dnl
+dnl * the GNU General Public License as published by the Free Software
+dnl Foundation; either version 2 of the License, or (at your option) any
+dnl later version.
+dnl
+dnl or both in parallel, as here.
+dnl
+dnl The GNU MP Library is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+dnl for more details.
+dnl
+dnl You should have received copies of the GNU General Public License and the
+dnl GNU Lesser General Public License along with the GNU MP Library. If not,
+dnl see https://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+C cycles/limb
+C AMD K8,K9 1
+C AMD K10 1
+C AMD bd1 1.36
+C AMD bobcat 1.71
+C Intel P4 2-3
+C Intel core2 1
+C Intel NHM 1
+C Intel SBR 1
+C Intel atom 2
+C VIA nano 2
+
+
+IFSTD(`define(`rp',`%rdi')')
+IFSTD(`define(`up',`%rsi')')
+IFSTD(`define(`n', `%rdx')')
+
+IFDOS(`define(`rp',`%rcx')')
+IFDOS(`define(`up',`%rdx')')
+IFDOS(`define(`n', `%r8')')
+
+ABI_SUPPORT(DOS64)
+ABI_SUPPORT(STD64)
+
+ASM_START()
+ TEXT
+ ALIGN(64)
+PROLOGUE(mpn_copyd)
+ lea -8(up,n,8), up
+ lea (rp,n,8), rp
+ sub $4, n
+ jc L(end)
+ nop
+
+L(top): mov (up), %rax
+ mov -8(up), %r9
+ lea -32(rp), rp
+ mov -16(up), %r10
+ mov -24(up), %r11
+ lea -32(up), up
+ mov %rax, 24(rp)
+ mov %r9, 16(rp)
+ sub $4, n
+ mov %r10, 8(rp)
+ mov %r11, (rp)
+ jnc L(top)
+
+L(end): shr R32(n)
+ jnc 1f
+ mov (up), %rax
+ mov %rax, -8(rp)
+ lea -8(rp), rp
+ lea -8(up), up
+1: shr R32(n)
+ jnc 1f
+ mov (up), %rax
+ mov -8(up), %r9
+ mov %rax, -8(rp)
+ mov %r9, -16(rp)
+1: ret
+EPILOGUE()