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/cmp_si.c b/third_party/gmp/mpz/cmp_si.c
new file mode 100644
index 0000000..23296c8
--- /dev/null
+++ b/third_party/gmp/mpz/cmp_si.c
@@ -0,0 +1,69 @@
+/* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V.
+ Return positive, zero, or negative based on if U > V, U == V, or U < V.
+
+Copyright 1991, 1993-1996, 2000-2002, 2012, 2013 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"
+
+int
+_mpz_cmp_si (mpz_srcptr u, signed long int v_digit) __GMP_NOTHROW
+{
+#if GMP_NAIL_BITS != 0
+ /* FIXME. This isn't very pretty. */
+ mpz_t tmp;
+ mp_limb_t tt[2];
+ PTR(tmp) = tt;
+ ALLOC(tmp) = 2;
+ mpz_set_si (tmp, v_digit);
+ return mpz_cmp (u, tmp);
+#else
+
+ mp_size_t vsize, usize;
+
+ usize = SIZ (u);
+ vsize = (v_digit > 0) - (v_digit < 0);
+
+ if ((usize == 0) | (usize != vsize))
+ return usize - vsize;
+ else {
+ mp_limb_t u_digit, absv_digit;
+
+ u_digit = PTR (u)[0];
+ absv_digit = ABS_CAST (unsigned long, v_digit);
+
+ if (u_digit == absv_digit)
+ return 0;
+
+ if (u_digit > absv_digit)
+ return usize;
+ else
+ return -usize;
+ }
+#endif
+}