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diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/s390_64/copyd.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/s390_64/copyd.asm
new file mode 100644
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+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/s390_64/copyd.asm
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+dnl S/390-64 mpn_copyd
+
+dnl Copyright 2011 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 z900 2.67
+C z990 1.5
+C z9 ?
+C z10 1.8
+C z196 ?
+
+C FIXME:
+C * Avoid saving/restoring callee-saves registers for n < 3. This could be
+C done by setting rp=r1, up=r2, i=r0 and r3,r4,r5 for clock regs.
+C We could then use r3...r10 in main loop.
+C * Could we use some EX trick, modifying lmg/stmg, for the feed-in code?
+
+C INPUT PARAMETERS
+define(`rp_param', `%r2')
+define(`up_param', `%r3')
+define(`n', `%r4')
+
+define(`rp', `%r8')
+define(`up', `%r9')
+
+ASM_START()
+PROLOGUE(mpn_copyd)
+ stmg %r6, %r11, 48(%r15)
+
+ sllg %r1, n, 3
+ la %r10, 8(n)
+ aghi %r1, -64
+ srlg %r10, %r10, 3
+ lghi %r11, -64
+
+ la rp, 0(%r1,rp_param) C FIXME use lay on z990 and later
+ la up, 0(%r1,up_param) C FIXME use lay on z990 and later
+
+ lghi %r7, 7
+ ngr %r7, n C n mod 8
+ cghi %r7, 2
+ jh L(b34567)
+ cghi %r7, 1
+ je L(b1)
+ jh L(b2)
+
+L(b0): brctg %r10, L(top)
+ j L(end)
+
+L(b1): lg %r0, 56(up)
+ aghi up, -8
+ stg %r0, 56(rp)
+ aghi rp, -8
+ brctg %r10, L(top)
+ j L(end)
+
+L(b2): lmg %r0, %r1, 48(up)
+ aghi up, -16
+ stmg %r0, %r1, 48(rp)
+ aghi rp, -16
+ brctg %r10, L(top)
+ j L(end)
+
+L(b34567):
+ cghi %r7, 4
+ jl L(b3)
+ je L(b4)
+ cghi %r7, 6
+ je L(b6)
+ jh L(b7)
+
+L(b5): lmg %r0, %r4, 24(up)
+ aghi up, -40
+ stmg %r0, %r4, 24(rp)
+ aghi rp, -40
+ brctg %r10, L(top)
+ j L(end)
+
+L(b3): lmg %r0, %r2, 40(up)
+ aghi up, -24
+ stmg %r0, %r2, 40(rp)
+ aghi rp, -24
+ brctg %r10, L(top)
+ j L(end)
+
+L(b4): lmg %r0, %r3, 32(up)
+ aghi up, -32
+ stmg %r0, %r3, 32(rp)
+ aghi rp, -32
+ brctg %r10, L(top)
+ j L(end)
+
+L(b6): lmg %r0, %r5, 16(up)
+ aghi up, -48
+ stmg %r0, %r5, 16(rp)
+ aghi rp, -48
+ brctg %r10, L(top)
+ j L(end)
+
+L(b7): lmg %r0, %r6, 8(up)
+ aghi up, -56
+ stmg %r0, %r6, 8(rp)
+ aghi rp, -56
+ brctg %r10, L(top)
+ j L(end)
+
+L(top): lmg %r0, %r7, 0(up)
+ la up, 0(%r11,up)
+ stmg %r0, %r7, 0(rp)
+ la rp, 0(%r11,rp)
+ brctg %r10, L(top)
+
+L(end): lmg %r6, %r11, 48(%r15)
+ br %r14
+EPILOGUE()