1 files changed, 73 insertions, 0 deletions
diff --git a/grub-core/tests/mul_test.c b/grub-core/tests/mul_test.c
new file mode 100644
index 0000000..cd64231
--- /dev/null
+++ b/grub-core/tests/mul_test.c
@@ -0,0 +1,73 @@
+/*
+ *  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+");
+
+static grub_uint64_t vectors[][2] = {
+  { 0xffffffffffffffffULL, 1},
+  { 1, 0xffffffffffffffffULL},
+  { 0xffffffffffffffffULL, 0xffffffffffffffffULL},
+  { 1, 1 },
+  { 2, 1 }
+};
+
+static void
+test64(grub_uint64_t a, grub_uint64_t b)
+{
+  grub_uint64_t r1 = a * b, r2 = 0, r3;
+  int i;
+  for (i = 0; i < 64; i++)
+    if ((a & (1LL << i)))
+      r2 += b << i;
+  r3 = ((grub_int64_t) a) * ((grub_int64_t) b);
+  grub_test_assert (r1 == r2,
+		    "multiplication mismatch (u): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
+		    (long long) a, (long long) b, (long long) r2, (long long) r1);
+  grub_test_assert (r3 == r2,
+		    "multiplication mismatch (s): 0x%llx x 0x%llx = 0x%llx != 0x%llx",
+		    (long long) a, (long long) b, (long long) r2, (long long) r3);
+}
+
+static void
+mul_test (void)
+{
+  grub_uint64_t a = 404, b = 7;
+  grub_size_t i;
+
+  for (i = 0; i < ARRAY_SIZE (vectors); i++)
+    {
+      test64 (vectors[i][0], vectors[i][1]);
+    }
+  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;
+      test64 (a, b);
+    }
+}
+
+/* Register example_test method as a functional test.  */
+GRUB_FUNCTIONAL_TEST (mul_test, mul_test);