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diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/arm64/copyi.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/arm64/copyi.asm
new file mode 100644
index 00000000000..8f7dbd4f520
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/arm64/copyi.asm
@@ -0,0 +1,77 @@
+dnl ARM64 mpn_copyi.
+
+dnl Copyright 2013 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 Cortex-A53 ?
+C Cortex-A57 ?
+
+changecom(@&*$)
+
+define(`rp', `x0')
+define(`up', `x1')
+define(`n', `x2')
+
+ASM_START()
+PROLOGUE(mpn_copyi)
+ cmp n, #3
+ b.le L(bc)
+
+C Copy until rp is 128-bit aligned
+ tbz rp, #3, L(al2)
+ ld1 {v22.1d}, [up], #8
+ sub n, n, #1
+ st1 {v22.1d}, [rp], #8
+
+L(al2): ld1 {v26.2d}, [up], #16
+ subs n, n, #6
+ b.lt L(end)
+
+ ALIGN(16)
+L(top): ld1 {v22.2d}, [up], #16
+ st1 {v26.2d}, [rp], #16
+ ld1 {v26.2d}, [up], #16
+ st1 {v22.2d}, [rp], #16
+ subs n, n, #4
+ b.ge L(top)
+
+L(end): st1 {v26.2d}, [rp], #16
+
+C Copy last 0-3 limbs. Note that rp is aligned after loop, but not when we
+C arrive here via L(bc)
+L(bc): tbz n, #1, L(tl1)
+ ld1 {v22.2d}, [up], #16
+ st1 {v22.2d}, [rp], #16
+L(tl1): tbz n, #0, L(tl2)
+ ld1 {v22.1d}, [up]
+ st1 {v22.1d}, [rp]
+L(tl2): ret
+EPILOGUE()