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111
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1 /* { dg-do run } */
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2 /* { dg-options "-O2 -ftree-tail-merge" } */
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3
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4 struct node
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5 {
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6 struct node *next;
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7 struct node *prev;
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8 };
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9
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10 struct node node;
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11
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12 struct head
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13 {
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14 struct node *first;
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15 };
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16
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17 struct head heads[5];
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18
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19 int k = 2;
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20
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21 struct head *head = &heads[2];
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22
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23 int
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24 main ()
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25 {
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26 struct node *p;
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27
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28 node.next = (void*)0;
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29
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30 node.prev = (void *)head;
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31
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32 head->first = &node;
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33
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34 struct node *n = head->first;
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35
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36 struct head *h = &heads[k];
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37
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38 heads[2].first = n->next;
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39
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40 if ((void*)n->prev == (void *)h)
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41 p = h->first;
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42 else
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43 /* Dead tbaa-unsafe load from ((struct node *)&heads[2])->next. */
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44 p = n->prev->next;
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45
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46 return !(p == (void*)0);
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47 }
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