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111
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1 /* { dg-do compile } */
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2 /* { dg-options "-O -fdump-tree-dce3" } */
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3
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4 struct rtx_def;
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5 typedef struct rtx_def *rtx;
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6 union tree_node;
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7 typedef union tree_node *tree;
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8 typedef struct mem_attrs
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9 {
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10 int foo;
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11
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12 } mem_attrs;
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13 union rtunion_def
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14 {
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15 mem_attrs *rtmem;
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16 };
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17 typedef union rtunion_def rtunion;
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18 struct rtx_def
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19 {
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20 rtunion fld[1];
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21 };
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22 struct tree_decl
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23 {
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24 rtx rtl;
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25 };
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26 union tree_node
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27 {
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28 struct tree_decl decl;
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29 };
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30 int make_decl_rtl (tree, int);
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31 void *
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32 get_alias_set (t)
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33 tree t;
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34 {
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35 long set;
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36 if (t->decl.rtl)
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37 return (t->decl.rtl->fld[1].rtmem
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38 ? 0
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39 : (((t->decl.rtl ? t->decl.rtl: (make_decl_rtl (t, 0), t->decl.rtl)))->fld[1]).rtmem);
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40 return (void*)-1;
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41 }
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42
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43 /* There should be precisely one load of ->decl.rtl. If there is
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44 more than, then the dominator optimizations failed. */
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45 /* { dg-final { scan-tree-dump-times "->decl\\.rtl" 1 "dce3"} } */
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46
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47 /* There should be no loads of .rtmem since the complex return statement
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48 is just "return 0". */
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49 /* { dg-final { scan-tree-dump-times ".rtmem" 0 "dce3"} } */
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50
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51 /* There should be one IF statement (the complex return statement should
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52 collapse down to a simple return 0 without any conditionals). */
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53 /* { dg-final { scan-tree-dump-times "if " 1 "dce3"} } */
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54
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