+/*
+ * Copyright (C) 2007 Free Software Foundation
+ *
+ * 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 2, 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA. */
+
+/* Written by Ben Pfaff. */
+
+#include <config.h>
+
+#include "popcount.h"
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define ASSERT(expr) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ fprintf (stderr, "%s:%d: assertion \"%s\" failed\n", \
+ __FILE__, __LINE__, #expr); \
+ abort (); \
+ } \
+ } \
+ while (0)
+
+#define UINT_BIT (sizeof (unsigned int) * CHAR_BIT)
+#define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT)
+#define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT)
+
+#ifndef ULLONG_MAX
+# define HALF (1ULL << (sizeof (unsigned long long int) * CHAR_BIT - 1))
+# define ULLONG_MAX (HALF - 1 + HALF)
+#endif
+
+int
+main (int argc, char *argv[])
+{
+ int i, j;
+
+#define TEST_POPCOUNT(FUNC, TYPE, BITS, MAX, ONE) \
+ ASSERT (FUNC (0) == 0); \
+ for (i = 0; i < BITS; i++) \
+ { \
+ ASSERT (FUNC (ONE << i) == 1); \
+ for (j = i + 1; j < BITS; j++) \
+ ASSERT (FUNC ((ONE << i) | (ONE << j)) == 2); \
+ } \
+ for (i = 0; i < 1000; i++) \
+ { \
+ TYPE value = rand () ^ (rand () << 31 << 1); \
+ int count = 0; \
+ for (j = 0; j < BITS; j++) \
+ count += (value & (ONE << j)) != 0; \
+ ASSERT (count == FUNC (value)); \
+ } \
+ ASSERT (FUNC (MAX) == BITS);
+
+ TEST_POPCOUNT (popcount, unsigned int, UINT_BIT, UINT_MAX, 1U);
+ TEST_POPCOUNT (popcountl, unsigned long int, ULONG_BIT, ULONG_MAX, 1UL);
+#ifdef HAVE_UNSIGNED_LONG_LONG_INT
+ TEST_POPCOUNT (popcountll,
+ unsigned long long int, ULLONG_BIT, ULLONG_MAX, 1ULL);
+#endif
+
+ return 0;
+}