76 lines
3.3 KiB
C
76 lines
3.3 KiB
C
/* Test counting of trailing zeros.
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Copyright (C) 2013-2024 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "count-trailing-zeros.h"
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#include <limits.h>
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#include <stdio.h>
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#include "macros.h"
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#define UINT_BIT (sizeof (unsigned int) * CHAR_BIT)
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#define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT)
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#define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT)
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int
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main (int argc, char *argv[])
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{
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int i, j;
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#define TEST_COUNT_TRAILING_ZEROS(FUNC, TYPE, BITS, MAX, ONE) \
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ASSERT (FUNC (0) == BITS); \
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for (i = 0; i < BITS; i++) \
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{ \
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ASSERT (FUNC (ONE << i) == i); \
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for (j = 0; j < i; j++) \
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ASSERT (FUNC ((ONE << i) | (ONE << j)) == j); \
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} \
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for (i = 0; i < 1000; i++) \
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{ \
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/* RAND_MAX is most often 0x7fff or 0x7fffffff. */ \
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TYPE value = \
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(RAND_MAX <= 0xffff \
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? ((TYPE) rand () >> 3) \
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^ (((TYPE) rand () >> 3) << 12) \
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^ (((TYPE) rand () >> 3) << 24) \
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^ (((TYPE) rand () >> 3) << 30 << 6) \
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^ (((TYPE) rand () >> 3) << 30 << 18) \
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^ (((TYPE) rand () >> 3) << 30 << 30) \
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: ((TYPE) rand () >> 3) \
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^ (((TYPE) rand () >> 3) << 22) \
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^ (((TYPE) rand () >> 3) << 22 << 22)); \
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int count = 0; \
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for (j = BITS - 1; 0 <= j; j--) \
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if (value & (ONE << j)) \
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count = j; \
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ASSERT (count == FUNC (value)); \
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} \
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ASSERT (FUNC (MAX) == 0);
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TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros, unsigned int,
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UINT_BIT, UINT_MAX, 1U);
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TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_l, unsigned long int,
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ULONG_BIT, ULONG_MAX, 1UL);
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TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_ll, unsigned long long int,
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ULLONG_BIT, ULLONG_MAX, 1ULL);
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return test_exit_status;
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}
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