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diff --git a/gmp/mpn/x86_64/pentium4/gmp-mparam.h b/gmp/mpn/x86_64/pentium4/gmp-mparam.h
new file mode 100644
index 00000000..ca923977
--- /dev/null
+++ b/gmp/mpn/x86_64/pentium4/gmp-mparam.h
@@ -0,0 +1,79 @@
+/* Pentium 4-64 gmp-mparam.h -- Compiler/machine parameter header file.
+
+Copyright 1991, 1993, 1994, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+2008, 2009 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#define BITS_PER_MP_LIMB 64
+#define BYTES_PER_MP_LIMB 8
+
+/* These routines exists for all x86_64 chips, but they are slower on Pentium4
+   than separate add/sub and shift.  Make sure they are not really used.  */
+#undef HAVE_NATIVE_mpn_addlsh1_n
+#undef HAVE_NATIVE_mpn_sublsh1_n
+#undef HAVE_NATIVE_mpn_rsh1add_n
+#undef HAVE_NATIVE_mpn_rsh1sub_n
+
+/* 3200 MHz Pentium / 2048 Kibyte cache / socket 775 */
+
+/* Generated by tuneup.c, 2009-01-15, gcc 3.4 */
+
+#define MUL_KARATSUBA_THRESHOLD          12
+#define MUL_TOOM3_THRESHOLD              91
+#define MUL_TOOM44_THRESHOLD            136
+
+#define SQR_BASECASE_THRESHOLD            0  /* always (native) */
+#define SQR_KARATSUBA_THRESHOLD          28
+#define SQR_TOOM3_THRESHOLD              97
+#define SQR_TOOM4_THRESHOLD             218
+
+#define MULLOW_BASECASE_THRESHOLD         0  /* always */
+#define MULLOW_DC_THRESHOLD              28
+#define MULLOW_MUL_N_THRESHOLD          246
+
+#define DIV_SB_PREINV_THRESHOLD           0  /* always */
+#define DIV_DC_THRESHOLD                 35
+#define POWM_THRESHOLD                   59
+
+#define MATRIX22_STRASSEN_THRESHOLD      25
+#define HGCD_THRESHOLD                  112
+#define GCD_DC_THRESHOLD                258
+#define GCDEXT_DC_THRESHOLD             311
+#define JACOBI_BASE_METHOD                1
+
+#define MOD_1_NORM_THRESHOLD              0  /* always */
+#define MOD_1_UNNORM_THRESHOLD            0  /* always */
+#define MOD_1_1_THRESHOLD                 5
+#define MOD_1_2_THRESHOLD                 7
+#define MOD_1_4_THRESHOLD                28
+#define USE_PREINV_DIVREM_1               1  /* native */
+#define USE_PREINV_MOD_1                  1
+#define DIVEXACT_1_THRESHOLD              0  /* always (native) */
+#define MODEXACT_1_ODD_THRESHOLD          0  /* always (native) */
+
+#define GET_STR_DC_THRESHOLD             15
+#define GET_STR_PRECOMPUTE_THRESHOLD     24
+#define SET_STR_DC_THRESHOLD            866
+#define SET_STR_PRECOMPUTE_THRESHOLD   1646
+
+#define MUL_FFT_TABLE  { 240, 416, 1216, 2304, 7168, 20480, 49152, 196608, 786432, 0 }
+#define MUL_FFT_MODF_THRESHOLD          256
+#define MUL_FFT_THRESHOLD              2944
+
+#define SQR_FFT_TABLE  { 208, 480, 1600, 2304, 7168, 20480, 49152, 196608, 786432, 0 }
+#define SQR_FFT_MODF_THRESHOLD          224
+#define SQR_FFT_THRESHOLD              2688