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diff --git a/gmp-6.3.0/mpn/generic/sbpi1_bdiv_r.c b/gmp-6.3.0/mpn/generic/sbpi1_bdiv_r.c
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+/* mpn_sbpi1_bdiv_r -- schoolbook Hensel division with precomputed inverse,
+   returning remainder.
+
+   Contributed to the GNU project by Niels Möller and Torbjörn Granlund.
+
+   THE FUNCTIONS IN THIS FILE ARE INTERNAL FUNCTIONS WITH MUTABLE INTERFACES.
+   IT IS ONLY SAFE TO REACH THEM THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS
+   ALMOST GUARANTEED THAT THEY'LL CHANGE OR DISAPPEAR IN A FUTURE GMP RELEASE.
+
+Copyright 2006, 2009, 2011, 2012, 2017 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 either:
+
+  * 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.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#include "gmp-impl.h"
+
+
+/* Computes a binary quotient of size qn = un - dn.
+   Output:
+
+      Q = -U * D^{-1} mod B^qn,
+
+      R = (U + Q * D) * B^(-qn)
+
+   Stores the dn least significant limbs of R at {up + un - dn, dn},
+   and returns the carry from the addition N + Q*D.
+
+   D must be odd. dinv is (-D)^-1 mod B. */
+
+mp_limb_t
+mpn_sbpi1_bdiv_r (mp_ptr up, mp_size_t un,
+		  mp_srcptr dp, mp_size_t dn, mp_limb_t dinv)
+{
+  mp_size_t i;
+  mp_limb_t cy;
+
+  ASSERT (dn > 0);
+  ASSERT (un > dn);
+  ASSERT ((dp[0] & 1) != 0);
+  ASSERT (-(dp[0] * dinv) == 1);
+
+  for (i = un - dn, cy = 0; i != 0; i--)
+    {
+      mp_limb_t q = dinv * up[0];
+      mp_limb_t hi = mpn_addmul_1 (up, dp, dn, q);
+
+      hi += cy;
+      cy = hi < cy;
+      hi += up[dn];
+      cy += hi < up[dn];
+      up[dn] = hi;
+      up++;
+    }
+
+  return cy;
+}