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1 /* |
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2 * Copyright (C) 2011-2014 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 |
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15 * along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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16 |
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17 /* Written by Eric Blake. */ |
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18 #include <config.h> |
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19 |
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20 #include <string.h> |
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21 |
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22 #include "signature.h" |
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23 SIGNATURE_CHECK (ffsl, int, (long int)); |
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24 |
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25 #include <limits.h> |
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26 |
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27 #include "macros.h" |
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28 |
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29 #define NBITS (sizeof (long int) * CHAR_BIT) |
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30 |
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31 static int |
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32 naive (long int i) |
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33 { |
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34 unsigned long int j; |
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35 for (j = 0; j < NBITS; j++) |
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36 if (i & (1UL << j)) |
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37 return j + 1; |
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38 return 0; |
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39 } |
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40 |
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41 int |
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42 main (int argc, char *argv[]) |
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43 { |
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44 long int x; |
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45 int i; |
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46 |
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47 for (i = -128; i <= 128; i++) |
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48 ASSERT (ffsl (i) == naive (i)); |
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49 for (i = 0; i < NBITS; i++) |
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50 { |
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51 ASSERT (ffsl (1UL << i) == naive (1UL << i)); |
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52 ASSERT (ffsl (1UL << i) == i + 1); |
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53 ASSERT (ffsl (-1UL << i) == i + 1); |
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54 } |
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55 for (i = 0; i < NBITS - 1; i++) |
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56 { |
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57 ASSERT (ffsl (3UL << i) == i + 1); |
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58 ASSERT (ffsl (-3UL << i) == i + 1); |
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59 } |
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60 for (i = 0; i < NBITS - 2; i++) |
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61 { |
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62 ASSERT (ffsl (5UL << i) == i + 1); |
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63 ASSERT (ffsl (-5UL << i) == i + 1); |
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64 ASSERT (ffsl (7UL << i) == i + 1); |
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65 ASSERT (ffsl (-7UL << i) == i + 1); |
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66 } |
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67 return 0; |
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68 } |
