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diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium4/copyd.asm b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium4/copyd.asm
new file mode 100644
index 00000000000..82af81c522b
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+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/x86/pentium4/copyd.asm
@@ -0,0 +1,71 @@
+dnl Pentium-4 mpn_copyd -- copy limb vector, decrementing.
+
+dnl Copyright 1999-2001 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/.
+
+
+dnl The std/rep/movsl/cld is very slow for small blocks on pentium4. Its
+dnl startup time seems to be about 165 cycles. It then needs 2.6 c/l.
+dnl We therefore use an open-coded 2 c/l copying loop.
+
+dnl Ultimately, we may want to use 64-bit movq or 128-bit movdqu in some
+dnl nifty unrolled arrangement. Clearly, that could reach much higher
+dnl speeds, at least for large blocks.
+
+include(`../config.m4')
+
+
+defframe(PARAM_SIZE, 12)
+defframe(PARAM_SRC, 8)
+defframe(PARAM_DST, 4)
+
+ TEXT
+ ALIGN(8)
+
+PROLOGUE(mpn_copyd)
+deflit(`FRAME',0)
+
+ movl PARAM_SIZE, %ecx
+
+ movl PARAM_SRC, %eax
+ movl PARAM_DST, %edx
+ movl %ebx, PARAM_SIZE
+ addl $-1, %ecx
+ js L(end)
+
+L(loop):
+ movl (%eax,%ecx,4), %ebx
+ movl %ebx, (%edx,%ecx,4)
+ addl $-1, %ecx
+
+ jns L(loop)
+L(end):
+ movl PARAM_SIZE, %ebx
+ ret
+
+EPILOGUE()