1 files changed, 87 insertions, 0 deletions
diff --git a/gmp/tests/t-count_zeros.c b/gmp/tests/t-count_zeros.c
new file mode 100644
index 0000000000..117babadc6
--- /dev/null
+++ b/gmp/tests/t-count_zeros.c
@@ -0,0 +1,87 @@
+/* Test count_leading_zeros and count_trailing_zeros.
+
+Copyright 2001-2003 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.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+#include "tests.h"
+
+void
+check_clz (int want, mp_limb_t n)
+{
+  int  got;
+  count_leading_zeros (got, n);
+  if (got != want)
+    {
+      printf        ("count_leading_zeros wrong\n");
+      mp_limb_trace ("  n    ", n);
+      printf        ("  want %d\n", want);
+      printf        ("  got  %d\n", got);
+      abort ();
+    }
+}
+
+void
+check_ctz (int want, mp_limb_t n)
+{
+  int  got;
+  count_trailing_zeros (got, n);
+  if (got != want)
+    {
+      printf ("count_trailing_zeros wrong\n");
+      mpn_trace ("  n    ", &n, (mp_size_t) 1);
+      printf    ("  want %d\n", want);
+      printf    ("  got  %d\n", got);
+      abort ();
+    }
+}
+
+void
+check_various (void)
+{
+  int        i;
+
+#ifdef COUNT_LEADING_ZEROS_0
+  check_clz (COUNT_LEADING_ZEROS_0, CNST_LIMB(0));
+#endif
+
+  for (i=0; i < GMP_LIMB_BITS; i++)
+    {
+      check_clz (i, CNST_LIMB(1) << (GMP_LIMB_BITS-1-i));
+      check_ctz (i, CNST_LIMB(1) << i);
+
+      check_ctz (i, MP_LIMB_T_MAX << i);
+      check_clz (i, MP_LIMB_T_MAX >> i);
+    }
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  tests_start ();
+  mp_trace_base = 16;
+
+  check_various ();
+
+  tests_end ();
+  exit (0);
+}