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/* Test counting of trailing zeros.
Copyright (C) 2013-2023 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 <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include "count-trailing-zeros.h"
#include <limits.h>
#include <stdio.h>
#include "macros.h"
#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)
int
main (int argc, char *argv[])
{
int i, j;
#define TEST_COUNT_TRAILING_ZEROS(FUNC, TYPE, BITS, MAX, ONE) \
ASSERT (FUNC (0) == BITS); \
for (i = 0; i < BITS; i++) \
{ \
ASSERT (FUNC (ONE << i) == i); \
for (j = 0; j < i; j++) \
ASSERT (FUNC ((ONE << i) | (ONE << j)) == j); \
} \
for (i = 0; i < 1000; i++) \
{ \
/* RAND_MAX is most often 0x7fff or 0x7fffffff. */ \
TYPE value = \
(RAND_MAX <= 0xffff \
? ((TYPE) rand () >> 3) \
^ (((TYPE) rand () >> 3) << 12) \
^ (((TYPE) rand () >> 3) << 24) \
^ (((TYPE) rand () >> 3) << 30 << 6) \
^ (((TYPE) rand () >> 3) << 30 << 18) \
^ (((TYPE) rand () >> 3) << 30 << 30) \
: ((TYPE) rand () >> 3) \
^ (((TYPE) rand () >> 3) << 22) \
^ (((TYPE) rand () >> 3) << 22 << 22)); \
int count = 0; \
for (j = BITS - 1; 0 <= j; j--) \
if (value & (ONE << j)) \
count = j; \
ASSERT (count == FUNC (value)); \
} \
ASSERT (FUNC (MAX) == 0);
TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros, unsigned int,
UINT_BIT, UINT_MAX, 1U);
TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_l, unsigned long int,
ULONG_BIT, ULONG_MAX, 1UL);
TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_ll, unsigned long long int,
ULLONG_BIT, ULLONG_MAX, 1ULL);
return 0;
}
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