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72 lines
2.8 KiB
C
72 lines
2.8 KiB
C
/* Test counting of trailing zeros.
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Copyright (C) 2013-2017 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 <http://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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#ifndef ULLONG_MAX
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# define HALF (1ULL << (sizeof (unsigned long long int) * CHAR_BIT - 1))
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# define ULLONG_MAX (HALF - 1 + HALF)
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#endif
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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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TYPE value = rand () ^ (rand () << 31 << 1); \
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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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#ifdef HAVE_UNSIGNED_LONG_LONG_INT
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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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#endif
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return 0;
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}
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