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diff --git a/gmp-6.3.0/mpn/generic/mullo_basecase.c b/gmp-6.3.0/mpn/generic/mullo_basecase.c
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+++ b/gmp-6.3.0/mpn/generic/mullo_basecase.c
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+/* mpn_mullo_basecase -- Internal routine to multiply two natural
+   numbers of length n and return the low part.
+
+   THIS IS AN INTERNAL FUNCTION WITH A MUTABLE INTERFACE.  IT IS ONLY
+   SAFE TO REACH THIS FUNCTION THROUGH DOCUMENTED INTERFACES.
+
+
+Copyright (C) 2000, 2002, 2004, 2015 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"
+
+/* FIXME: Should optionally use mpn_mul_2/mpn_addmul_2.  */
+
+#ifndef MULLO_VARIANT
+#define MULLO_VARIANT 2
+#endif
+
+
+#if MULLO_VARIANT == 1
+void
+mpn_mullo_basecase (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
+{
+  mp_size_t i;
+
+  mpn_mul_1 (rp, up, n, vp[0]);
+
+  for (i = n - 1; i > 0; i--)
+    {
+      vp++;
+      rp++;
+      mpn_addmul_1 (rp, up, i, vp[0]);
+    }
+}
+#endif
+
+
+#if MULLO_VARIANT == 2
+void
+mpn_mullo_basecase (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
+{
+  mp_limb_t h;
+
+  h = up[0] * vp[n - 1];
+
+  if (n != 1)
+    {
+      mp_size_t i;
+      mp_limb_t v0;
+
+      v0 = *vp++;
+      h += up[n - 1] * v0 + mpn_mul_1 (rp, up, n - 1, v0);
+      rp++;
+
+      for (i = n - 2; i > 0; i--)
+	{
+	  v0 = *vp++;
+	  h += up[i] * v0 + mpn_addmul_1 (rp, up, i, v0);
+	  rp++;
+	}
+    }
+
+  rp[0] = h;
+}
+#endif