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/mini-gmp/tests/t-limbs.c b/third_party/gmp/mini-gmp/tests/t-limbs.c
new file mode 100644
index 0000000..f4e57dd
--- /dev/null
+++ b/third_party/gmp/mini-gmp/tests/t-limbs.c
@@ -0,0 +1,111 @@
+/*
+
+Copyright 2012, 2014, 2016, Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library test suite.
+
+The GNU MP Library test suite is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 3 of the License,
+or (at your option) any later version.
+
+The GNU MP Library test suite 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 a copy of the GNU General Public License along with
+the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
+
+#include <assert.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "testutils.h"
+
+#define MAXBITS 400
+#define COUNT 100
+
+void
+my_mpz_mul (mpz_t r, mpz_srcptr a, mpz_srcptr b)
+{
+ mp_limb_t *tp;
+ mp_size_t tn, an, bn;
+
+ an = mpz_size (a);
+ bn = mpz_size (b);
+
+ assert (an > 0);
+ assert (bn > 0);
+
+ tn = an + bn;
+ tp = mpz_limbs_write (r, tn);
+ if (an > bn)
+ mpn_mul (tp, mpz_limbs_read (a), an, mpz_limbs_read (b), bn);
+ else
+ mpn_mul (tp, mpz_limbs_read (b), bn, mpz_limbs_read (a), an);
+
+ if (mpz_sgn (a) != mpz_sgn(b))
+ tn = - tn;
+
+ mpz_limbs_finish (r, tn);
+}
+
+void
+testmain (int argc, char **argv)
+{
+ unsigned i;
+ mpz_t a, b, res, ref;
+
+ mpz_init (a);
+ mpz_init (b);
+ mpz_init (res);
+ mpz_init (ref);
+
+ for (i = 0; i < COUNT; i++)
+ {
+ mini_random_op3 (OP_MUL, MAXBITS, a, b, ref);
+ if (mpz_sgn(ref) == 0)
+ /* my_mpz_mul requires a != 0, b != 0 */
+ continue;
+ my_mpz_mul (res, a, b);
+ if (mpz_cmp (res, ref))
+ {
+ fprintf (stderr, "my_mpz_mul failed:\n");
+ dump ("a", a);
+ dump ("b", b);
+ dump ("r", res);
+ dump ("ref", ref);
+ abort ();
+ }
+ /* The following test exploits a side-effect of my_mpz_mul: res
+ points to a buffer with at least an+bn limbs, and the limbs
+ above the result are zeroed. */
+ if (mpz_size (b) > 0 && mpz_getlimbn (res, mpz_size(a)) != mpz_limbs_read (res) [mpz_size(a)])
+ {
+ fprintf (stderr, "getlimbn - limbs_read differ.\n");
+ abort ();
+ }
+ if ((i % 4 == 0) && mpz_size (res) > 1)
+ {
+ mpz_realloc2 (res, 1);
+ if (mpz_cmp_ui (res, 0))
+ {
+ fprintf (stderr, "mpz_realloc2 did not clear res.\n");
+ abort ();
+ }
+ mpz_limbs_finish (ref, 0);
+ if (mpz_cmp_d (ref, 0))
+ {
+ fprintf (stderr, "mpz_limbs_finish did not clear res.\n");
+ abort ();
+ }
+ }
+ }
+ mpz_clear (a);
+ mpz_clear (b);
+ mpz_clear (res);
+ mpz_clear (ref);
+}