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145
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1 /* { dg-do compile } */
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2 /* { dg-options "-O3 -std=gnu++14" } */
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3
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4 template <typename Function>
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5 bool run(const int item_count,
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6 Function && process_range,
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7 const int max_parallelism,
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8 int* progress = nullptr)
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9 {
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10 if (max_parallelism <= 1)
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11 {
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12 if (progress == nullptr)
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13 {
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14 return process_range(0);
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15 }
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16 else
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17 {
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18 auto result = true;
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19 for (int i = 0; i != item_count && result; ++i)
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20 {
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21 (*progress)++;
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22 result = process_range(i);
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23 }
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24 return result;
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25 }
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26 }
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27
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28 if (max_parallelism > 10)
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29 {
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30 if (progress == nullptr)
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31 {
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32 return process_range(0);
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33 }
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34 else
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35 {
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36 auto result = true;
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37 for (int i = 0; i != item_count && result; ++i)
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38 {
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39 (*progress)++;
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40 result = process_range(i);
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41 }
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42 return result;
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43 }
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44 }
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45 return false;
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46 }
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47
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48 namespace
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49 {
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50 __attribute__((optimize(0))) bool worker_fun(const int)
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51 {
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52 return true;
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53 }
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54 }
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55
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56 void demo(int n)
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57 {
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58 for (int i = 0; i < n; ++i)
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59 {
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60 run(n, &worker_fun, n);
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61 }
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62 }
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