Initial commit.

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diff --git a/gmp-6.3.0/mpn/generic/gcd_11.c b/gmp-6.3.0/mpn/generic/gcd_11.c
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+++ b/gmp-6.3.0/mpn/generic/gcd_11.c
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+/* mpn_gcd_11 -- limb greatest common divisor.
+
+Copyright 1994, 1996, 2000, 2001, 2009, 2012, 2019 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"
+#include "longlong.h"
+
+mp_limb_t
+mpn_gcd_11 (mp_limb_t u, mp_limb_t v)
+{
+  ASSERT (u & v & 1);
+
+  /* In this loop, we represent the odd numbers ulimb and vlimb
+     without the redundant least significant one bit. This reduction
+     in size by one bit ensures that the high bit of t, below, is set
+     if and only if vlimb > ulimb. */
+
+  u >>= 1;
+  v >>= 1;
+
+  while (u != v)
+    {
+      mp_limb_t t;
+      mp_limb_t vgtu;
+      int c;
+
+      t = u - v;
+      vgtu = LIMB_HIGHBIT_TO_MASK (t);
+
+      /* v <-- min (u, v) */
+      v += (vgtu & t);
+
+      /* u <-- |u - v| */
+      u = (t ^ vgtu) - vgtu;
+
+      count_trailing_zeros (c, t);
+      /* We have c <= GMP_LIMB_BITS - 2 here, so that
+
+	   ulimb >>= (c + 1);
+
+	 would be safe. But unlike the addition c + 1, a separate
+	 shift by 1 is independent of c, and can be executed in
+	 parallel with count_trailing_zeros. */
+      u = (u >> 1) >> c;
+    }
+  return (u << 1) + 1;
+}