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diff --git a/Build/source/libs/gmp/gmp-src/mpn/x86_64/pentium4/aorslsh2_n.asm b/Build/source/libs/gmp/gmp-src/mpn/x86_64/pentium4/aorslsh2_n.asm
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index 00000000000..001f0ac5bfa
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-src/mpn/x86_64/pentium4/aorslsh2_n.asm
@@ -0,0 +1,50 @@
+dnl AMD64 mpn_addlsh2_n, mpn_sublsh2_n -- rp[] = up[] +- (vp[] << 2),
+dnl optimised for Pentium 4.
+
+dnl Contributed to the GNU project by Torbjorn Granlund.
+
+dnl Copyright 2008, 2010-2012 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')
+
+define(LSH, 2)
+define(RSH, 30) C 30, not 62, since we use 32-bit ops
+
+ifdef(`OPERATION_addlsh2_n', `
+ define(ADDSUB, add)
+ define(func, mpn_addlsh2_n)')
+ifdef(`OPERATION_sublsh2_n', `
+ define(ADDSUB, sub)
+ define(func, mpn_sublsh2_n)')
+
+ABI_SUPPORT(DOS64)
+ABI_SUPPORT(STD64)
+
+MULFUNC_PROLOGUE(mpn_addlsh2_n mpn_sublsh2_n)
+include_mpn(`x86_64/pentium4/aorslshC_n.asm')