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111
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1 /* { dg-do compile } */
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2 /* { dg-options "-O1 -fdump-tree-dom2 -std=gnu89" } */
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3
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4 extern void abort (void);
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5 union tree_node;
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6 typedef union tree_node *tree;
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7
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8
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9 enum tree_code
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10 {
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11 SET_TYPE,
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12 RECORD_TYPE,
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13 LAST_AND_UNUSED_TREE_CODE
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14 };
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15 extern const char tree_code_type[];
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16
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17 struct tree_common
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18 {
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19
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20 enum tree_code code:8;
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21 };
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22
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23
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24
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25
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26
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27 union tree_node
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28 {
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29 struct tree_common common;
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30 };
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31
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32 readonly_fields_p (type)
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33 tree type;
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34 {
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35
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36 if (type->common.code != RECORD_TYPE)
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37 return;
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38
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39 if (tree_code_type[type->common.code] != 't')
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40 abort ();
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41
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42 return;
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43 }
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44
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45 /* A good optimizer would realize that the cast to (unsigned int) is
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46 useless as the earlier cast of the same value of (unsigned char) will
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47 always produce the same result. */
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48 /* { dg-final { scan-tree-dump-times "\\(unsigned int\\)" 0 "dom2"} } */
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49
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50 /* There should be one load of ->common.code. We currently fail this
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51 because we load from ->common.code using different types. */
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52 /* { dg-final { scan-tree-dump-times "common\.code" 1 "dom2"} } */
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53
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