Mercurial > gnulib
annotate tests/test-count-trailing-zeros.c @ 39824:87e523c3d063
count-trailing-zeros tests: Rely on limits-h module.
* tests/test-count-trailing-zeros.c (ULLONG_MAX): Remove fallback
definition.
* modules/count-trailing-zeros-tests (Depends-on): Add 'limits-h'.
author | Bruno Haible <bruno@clisp.org> |
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date | Thu, 06 Sep 2018 14:50:04 +0200 |
parents | 10eb9086bea0 |
children | b06060465f09 |
rev | line source |
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1 /* Test counting of trailing zeros. |
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2 Copyright (C) 2013-2018 Free Software Foundation, Inc. |
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3 |
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4 This program is free software: you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 3 of the License, or |
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7 (at your option) any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
19190 | 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
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16 |
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17 /* Written by Paul Eggert. */ |
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18 |
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19 #include <config.h> |
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20 |
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21 #include "count-trailing-zeros.h" |
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22 |
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23 #include <limits.h> |
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24 #include <stdio.h> |
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25 |
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26 #include "macros.h" |
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27 |
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28 #define UINT_BIT (sizeof (unsigned int) * CHAR_BIT) |
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29 #define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT) |
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30 #define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT) |
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31 |
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32 int |
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33 main (int argc, char *argv[]) |
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34 { |
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35 int i, j; |
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36 |
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37 #define TEST_COUNT_TRAILING_ZEROS(FUNC, TYPE, BITS, MAX, ONE) \ |
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38 ASSERT (FUNC (0) == BITS); \ |
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39 for (i = 0; i < BITS; i++) \ |
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40 { \ |
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41 ASSERT (FUNC (ONE << i) == i); \ |
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42 for (j = 0; j < i; j++) \ |
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43 ASSERT (FUNC ((ONE << i) | (ONE << j)) == j); \ |
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44 } \ |
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45 for (i = 0; i < 1000; i++) \ |
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46 { \ |
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47 TYPE value = rand () ^ (rand () << 31 << 1); \ |
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48 int count = 0; \ |
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49 for (j = BITS - 1; 0 <= j; j--) \ |
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50 if (value & (ONE << j)) \ |
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51 count = j; \ |
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52 ASSERT (count == FUNC (value)); \ |
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53 } \ |
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54 ASSERT (FUNC (MAX) == 0); |
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55 |
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56 TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros, unsigned int, |
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57 UINT_BIT, UINT_MAX, 1U); |
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58 TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_l, unsigned long int, |
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59 ULONG_BIT, ULONG_MAX, 1UL); |
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60 #ifdef HAVE_UNSIGNED_LONG_LONG_INT |
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61 TEST_COUNT_TRAILING_ZEROS (count_trailing_zeros_ll, unsigned long long int, |
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62 ULLONG_BIT, ULLONG_MAX, 1ULL); |
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63 #endif |
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64 |
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65 return 0; |
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66 } |