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diff --git a/gmp/mpn/x86/i486/gmp-mparam.h b/gmp/mpn/x86/i486/gmp-mparam.h
new file mode 100644
index 00000000..aaddea9f
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+++ b/gmp/mpn/x86/i486/gmp-mparam.h
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+/* 80486 gmp-mparam.h -- Compiler/machine parameter header file.
+
+Copyright 2001, 2002, 2003 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 32
+#define BYTES_PER_MP_LIMB 4
+
+
+/* 100MHz DX4 */
+
+/* Generated by tuneup.c, 2003-02-13, gcc 2.95 */
+
+#define MUL_KARATSUBA_THRESHOLD          18
+#define MUL_TOOM3_THRESHOLD             228
+
+#define SQR_BASECASE_THRESHOLD           13
+#define SQR_KARATSUBA_THRESHOLD          49
+#define SQR_TOOM3_THRESHOLD             238
+
+#define DIV_SB_PREINV_THRESHOLD       MP_SIZE_T_MAX  /* never */
+#define DIV_DC_THRESHOLD                 72
+#define POWM_THRESHOLD                   38
+
+#define GCD_ACCEL_THRESHOLD               3
+#define JACOBI_BASE_METHOD                2
+
+#define USE_PREINV_DIVREM_1               0
+#define USE_PREINV_MOD_1                  0
+#define DIVREM_2_THRESHOLD            MP_SIZE_T_MAX  /* never */
+#define DIVEXACT_1_THRESHOLD              0  /* always (native) */
+#define MODEXACT_1_ODD_THRESHOLD         17
+
+#define GET_STR_DC_THRESHOLD             32
+#define GET_STR_PRECOMPUTE_THRESHOLD     82
+#define SET_STR_THRESHOLD              3524
+
+#define MUL_FFT_TABLE  { 464, 928, 1920, 4608, 10240, 40960, 0 }
+#define MUL_FFT_MODF_THRESHOLD          392
+#define MUL_FFT_THRESHOLD              2816
+
+#define SQR_FFT_TABLE  { 432, 928, 1920, 4608, 14336, 40960, 0 }
+#define SQR_FFT_MODF_THRESHOLD          392
+#define SQR_FFT_THRESHOLD              2816