Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/mpz/gcd_ui.c b/third_party/gmp/mpz/gcd_ui.c
new file mode 100644
index 0000000..ee5bff8
--- /dev/null
+++ b/third_party/gmp/mpz/gcd_ui.c
@@ -0,0 +1,84 @@
+/* mpz_gcd_ui -- Calculate the greatest common divisor of two integers.
+
+Copyright 1994, 1996, 1999-2004, 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 <stdio.h> /* for NULL */
+#include "gmp-impl.h"
+
+unsigned long int
+mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)
+{
+ mp_size_t un;
+ mp_limb_t res;
+
+#if BITS_PER_ULONG > GMP_NUMB_BITS /* avoid warnings about shift amount */
+ if (v > GMP_NUMB_MAX)
+ {
+ mpz_t vz;
+ mp_limb_t vlimbs[2];
+ vlimbs[0] = v & GMP_NUMB_MASK;
+ vlimbs[1] = v >> GMP_NUMB_BITS;
+ PTR(vz) = vlimbs;
+ SIZ(vz) = 2;
+ mpz_gcd (w, u, vz);
+ /* because v!=0 we will have w<=v hence fitting a ulong */
+ ASSERT (mpz_fits_ulong_p (w));
+ return mpz_get_ui (w);
+ }
+#endif
+
+ un = ABSIZ(u);
+
+ if (un == 0)
+ res = v;
+ else if (v == 0)
+ {
+ if (w != NULL)
+ {
+ if (u != w)
+ {
+ MPZ_NEWALLOC (w, un);
+ MPN_COPY (PTR(w), PTR(u), un);
+ }
+ SIZ(w) = un;
+ }
+ /* Return u if it fits a ulong, otherwise 0. */
+ res = PTR(u)[0];
+ return (un == 1 && res <= ULONG_MAX ? res : 0);
+ }
+ else
+ res = mpn_gcd_1 (PTR(u), un, (mp_limb_t) v);
+
+ if (w != NULL)
+ {
+ MPZ_NEWALLOC (w, 1)[0] = res;
+ SIZ(w) = res != 0;
+ }
+ return res;
+}