1 files changed, 111 insertions, 0 deletions
diff --git a/grub-core/tests/ctz_test.c b/grub-core/tests/ctz_test.c
new file mode 100644
index 0000000..eb7a1df
--- /dev/null
+++ b/grub-core/tests/ctz_test.c
@@ -0,0 +1,111 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB 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.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/test.h>
+#include <grub/dl.h>
+#include <grub/misc.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+/* ull version is not used on i386 other than in this test.
+   Avoid requiring extra function.
+  */
+#if defined (__i386__)
+#define SKIP_ULL 1
+#endif
+
+static grub_uint64_t vectors[] = {
+  0xffffffffffffffffULL, 1, 2, 0, 0x0102030405060708ULL
+};
+
+static void
+test_ui (unsigned int a)
+{
+  int i;
+  a |= 1;
+  for (i = 0; i < (int) (8 * sizeof (a)); i++)
+    {
+      grub_test_assert (__builtin_ctz(a << i) == i,
+			"ctz mismatch: ctz(0x%llx) != 0x%x",
+			(long long) (a << i), __builtin_ctz(a << i));
+    }
+}
+
+static void
+test_ul (unsigned long a)
+{
+  int i;
+  a |= 1;
+  for (i = 0; i < (int) (8 * sizeof (a)); i++)
+    {
+      grub_test_assert (__builtin_ctzl(a << i) == i,
+			"ctzl mismatch: ctzl(0x%llx) != 0x%x",
+			(long long) (a << i), __builtin_ctz(a << i));
+    }
+}
+
+#ifndef SKIP_ULL
+static void
+test_ull (unsigned long long a)
+{
+  int i;
+  a |= 1;
+  for (i = 0; i < (int) (8 * sizeof (a)); i++)
+    {
+      grub_test_assert (__builtin_ctzll(a << i) == i,
+			"ctzll mismatch: ctzll(0x%llx) != 0x%x",
+			(long long) (a << i), __builtin_ctz(a << i));
+    }
+}
+#endif
+
+static void
+test_all(grub_uint64_t a)
+{
+  test_ui (a);
+  test_ul (a);
+#ifndef SKIP_ULL
+  test_ull (a);
+#endif
+}
+
+static void
+ctz_test (void)
+{
+  grub_uint64_t a = 404, b = 7;
+  grub_size_t i;
+
+  for (i = 0; i < ARRAY_SIZE (vectors); i++)
+    {
+      test_all (vectors[i]);
+    }
+  for (i = 0; i < 40000; i++)
+    {
+      a = 17 * a + 13 * b;
+      b = 23 * a + 29 * b;
+      if (b == 0)
+	b = 1;
+      if (a == 0)
+	a = 1;
+      test_all (a);
+      test_all (b);
+    }
+}
+
+/* Register example_test method as a functional test.  */
+GRUB_FUNCTIONAL_TEST (ctz_test, ctz_test);