From 11da511c784eca003deb90c23570f0873954e0de Mon Sep 17 00:00:00 2001
From: Duncan Wilkie <antigravityd@gmail.com>
Date: Sat, 18 Nov 2023 06:11:09 -0600
Subject: Initial commit.

---
 gmp-6.3.0/mini-gmp/tests/t-limbs.c | 111 +++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 gmp-6.3.0/mini-gmp/tests/t-limbs.c

(limited to 'gmp-6.3.0/mini-gmp/tests/t-limbs.c')

diff --git a/gmp-6.3.0/mini-gmp/tests/t-limbs.c b/gmp-6.3.0/mini-gmp/tests/t-limbs.c
new file mode 100644
index 0000000..f4e57dd
--- /dev/null
+++ b/gmp-6.3.0/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);
+}
-- 
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