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/tests/mpf/t-div.c b/third_party/gmp/tests/mpf/t-div.c
new file mode 100644
index 0000000..3214592
--- /dev/null
+++ b/third_party/gmp/tests/mpf/t-div.c
@@ -0,0 +1,185 @@
+/* Test mpf_div.
+
+Copyright 2004 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 <stdio.h>
+#include <stdlib.h>
+#include "gmp-impl.h"
+#include "tests.h"
+
+
+void
+check_one (const char *desc, mpf_ptr got, mpf_srcptr u, mpf_srcptr v)
+{
+ if (! refmpf_validate_division ("mpf_div", got, u, v))
+ {
+ mp_trace_base = -16;
+ mpf_trace (" u", u);
+ mpf_trace (" v", v);
+ printf (" %s\n", desc);
+ abort ();
+ }
+}
+
+void
+check_rand (void)
+{
+ unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
+ gmp_randstate_ptr rands = RANDS;
+ unsigned long prec;
+ mpf_t got, u, v;
+ int i;
+
+ mpf_init (got);
+ mpf_init (u);
+ mpf_init (v);
+
+ /* separate */
+ for (i = 0; i < 100; i++)
+ {
+ /* got precision */
+ prec = min_prec + gmp_urandomm_ui (rands, 15L);
+ refmpf_set_prec_limbs (got, prec);
+
+ /* u */
+ prec = min_prec + gmp_urandomm_ui (rands, 15L);
+ refmpf_set_prec_limbs (u, prec);
+ do {
+ mpf_random2 (u, PREC(u), (mp_exp_t) 20);
+ } while (SIZ(u) == 0);
+ if (gmp_urandomb_ui (rands, 1L))
+ mpf_neg (u, u);
+
+ /* v */
+ prec = min_prec + gmp_urandomm_ui (rands, 15L);
+ refmpf_set_prec_limbs (v, prec);
+ do {
+ mpf_random2 (v, PREC(v), (mp_exp_t) 20);
+ } while (SIZ(v) == 0);
+ if (gmp_urandomb_ui (rands, 1L))
+ mpf_neg (v, v);
+
+ switch (i % 3) {
+ case 0:
+ mpf_div (got, u, v);
+ check_one ("separate", got, u, v);
+ break;
+ case 1:
+ prec = refmpf_set_overlap (got, u);
+ mpf_div (got, got, v);
+ check_one ("dst == u", got, u, v);
+ mpf_set_prec_raw (got, prec);
+ break;
+ case 2:
+ prec = refmpf_set_overlap (got, v);
+ mpf_div (got, u, got);
+ check_one ("dst == v", got, u, v);
+ mpf_set_prec_raw (got, prec);
+ break;
+ }
+ }
+
+ mpf_clear (got);
+ mpf_clear (u);
+ mpf_clear (v);
+}
+
+/* Exercise calls mpf(x,x,x) */
+void
+check_reuse_three (void)
+{
+ unsigned long min_prec = __GMPF_BITS_TO_PREC (1);
+ gmp_randstate_ptr rands = RANDS;
+ unsigned long result_prec, input_prec, set_prec;
+ mpf_t got;
+ int i;
+
+ mpf_init (got);
+
+ for (i = 0; i < 8; i++)
+ {
+ result_prec = min_prec + gmp_urandomm_ui (rands, 15L);
+ input_prec = min_prec + gmp_urandomm_ui (rands, 15L);
+
+ set_prec = MAX (result_prec, input_prec);
+ refmpf_set_prec_limbs (got, set_prec);
+
+ /* input, non-zero, possibly negative */
+ PREC(got) = input_prec;
+ do {
+ mpf_random2 (got, input_prec, (mp_exp_t) 20);
+ } while (SIZ(got) == 0);
+ if (gmp_urandomb_ui (rands, 1L))
+ mpf_neg (got, got);
+
+ PREC(got) = result_prec;
+
+ mpf_div (got, got, got);
+
+ /* expect exactly 1.0 always */
+ ASSERT_ALWAYS (mpf_cmp_ui (got, 1L) == 0);
+
+ PREC(got) = set_prec;
+ }
+
+ mpf_clear (got);
+}
+
+void
+check_various (void)
+{
+ mpf_t got, u, v;
+
+ mpf_init (got);
+ mpf_init (u);
+ mpf_init (v);
+
+ /* 100/4 == 25 */
+ mpf_set_prec (got, 20L);
+ mpf_set_ui (u, 100L);
+ mpf_set_ui (v, 4L);
+ mpf_div (got, u, v);
+ MPF_CHECK_FORMAT (got);
+ ASSERT_ALWAYS (mpf_cmp_ui (got, 25L) == 0);
+
+ /* 1/(2^n+1), a case where truncating the divisor would be wrong */
+ mpf_set_prec (got, 500L);
+ mpf_set_prec (v, 900L);
+ mpf_set_ui (v, 1L);
+ mpf_mul_2exp (v, v, 800L);
+ mpf_add_ui (v, v, 1L);
+ mpf_div (got, u, v);
+ check_one ("1/2^n+1, separate", got, u, v);
+
+ mpf_clear (got);
+ mpf_clear (u);
+ mpf_clear (v);
+}
+
+int
+main (void)
+{
+ tests_start ();
+
+ check_various ();
+ check_rand ();
+ check_reuse_three ();
+
+ tests_end ();
+ exit (0);
+}