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111
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1 /* { dg-do compile { target nonpic } } */
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2 /* { dg-options "-O2 -fdump-tree-pre-stats -fdump-tree-fre1" } */
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3 #include <stddef.h>
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4
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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 struct tree_common
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9 {
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10 tree chain;
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11 };
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12
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13 struct tree_list
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14 {
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15 struct tree_common common;
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16 tree value;
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17 };
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18
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19 union tree_node
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20
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21 {
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22 struct tree_common common;
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23 struct tree_list list;
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24 };
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25
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26 extern void abort (void) __attribute__((noreturn));
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27
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28 void __attribute__((noinline))
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29 foo (void)
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30 {
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31 abort ();
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32 }
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33
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34 /* There are some reloaded loads of *cell, and cell->common.chain on various
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35 branches. */
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36 void __attribute__((noinline))
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37 remove_useless_vars (tree *unexpanded_var_list, int dump_file)
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38 {
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39 tree var, *cell;
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40 int c = 0;
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41 for (cell = unexpanded_var_list; *cell; )
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42 {
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43 var = (*cell)->list.value;
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44 if (var)
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45 {
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46 if (dump_file)
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47 foo ();
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48
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49 *cell = ((*cell)->common.chain);
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50 continue;
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51 }
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52
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53 cell = &((*cell)->common.chain);
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54 }
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55 }
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56 extern void *malloc (__SIZE_TYPE__) __attribute__ ((malloc));
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57
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58 int
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59 main (void)
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60 {
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61 int i;
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62 tree unexpanded_var_list, last = (tree) 0;
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63
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64 for (i = 0; i < 2; i++)
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65 {
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66 unexpanded_var_list = malloc (sizeof (struct tree_list));
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67 unexpanded_var_list->list.value = (tree) (ptrdiff_t) (i & 1);
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68 unexpanded_var_list->common.chain = last;
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69 last = unexpanded_var_list;
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70 }
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71
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72 remove_useless_vars (&unexpanded_var_list, 0);
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73 return 0;
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74 }
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75
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76 /* { dg-final { scan-tree-dump-not "= unexpanded_var_list;" "fre1" } } */
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77 /* { dg-final { scan-tree-dump-times "Eliminated: 1" 1 "pre" } } */
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131
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78 /* { dg-final { scan-tree-dump-times "Insertions: 1" 1 "pre" } } */
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