2011-10-14 Bruno Haible <bruno@clisp.org>
+ Tests for module 'integer_length_ll'.
+ * modules/integer_length_ll-tests: New file.
+ * tests/test-integer_length_ll.c: New file.
+
New module 'integer_length_ll'.
* lib/integer_length_ll.c: New file.
* modules/integer_length_ll: New file.
--- /dev/null
+/* Test of integer_length_ll().
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ This program 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.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include "integer_length.h"
+
+#include <limits.h>
+
+#include "macros.h"
+
+#define NBITS (sizeof (unsigned long long) * CHAR_BIT)
+
+static int
+naive (unsigned long long x)
+{
+ int j;
+ for (j = NBITS - 1; j >= 0; j--)
+ if (x & (1ULL << j))
+ return j + 1;
+ return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+ unsigned long x;
+ int i;
+
+ for (x = 0; x <= 256; x++)
+ ASSERT (integer_length_ll (x) == naive (x));
+ for (i = 0; i < NBITS; i++)
+ {
+ ASSERT (integer_length_ll (1ULL << i) == naive (1ULL << i));
+ ASSERT (integer_length_ll (1ULL << i) == i + 1);
+ ASSERT (integer_length_ll (-1ULL << i) == NBITS);
+ }
+ for (i = 0; i < NBITS - 1; i++)
+ ASSERT (integer_length_ll (3ULL << i) == i + 2);
+ for (i = 0; i < NBITS - 2; i++)
+ ASSERT (integer_length_ll (-3ULL << i) == NBITS);
+ for (i = 0; i < NBITS - 2; i++)
+ {
+ ASSERT (integer_length_ll (5ULL << i) == i + 3);
+ ASSERT (integer_length_ll (7ULL << i) == i + 3);
+ }
+ for (i = 0; i < NBITS - 3; i++)
+ {
+ ASSERT (integer_length_ll (-5ULL << i) == NBITS);
+ ASSERT (integer_length_ll (-7ULL << i) == NBITS);
+ }
+ return 0;
+}