1 /* { dg-do compile } */
2 /* { dg-options "-O -fdump-tree-dce3" } */
3 
4 struct rtx_def;
5 typedef struct rtx_def *rtx;
6 union tree_node;
7 typedef union tree_node *tree;
8 typedef struct mem_attrs
9 {
10   int  foo;
11 
12 } mem_attrs;
13 union rtunion_def
14 {
15   mem_attrs *rtmem;
16 };
17 typedef union rtunion_def rtunion;
18 struct rtx_def
19 {
20   rtunion fld[1];
21 };
22 struct tree_decl
23 {
24   rtx rtl;
25 };
26 union tree_node
27 {
28   struct tree_decl decl;
29 };
30 int make_decl_rtl (tree, int);
31 void *
get_alias_set(t)32 get_alias_set (t)
33      tree t;
34 {
35   long set;
36   if (t->decl.rtl)
37     return (t->decl.rtl->fld[1].rtmem
38 	    ? 0
39 	    : (((t->decl.rtl ? t->decl.rtl: (make_decl_rtl (t, 0), t->decl.rtl)))->fld[1]).rtmem);
40   return (void*)-1;
41 }
42 
43 /* There should be precisely one load of ->decl.rtl.  If there is
44    more than, then the dominator optimizations failed.  */
45 /* { dg-final { scan-tree-dump-times "->decl\\.rtl" 1 "dce3"} } */
46 
47 /* There should be no loads of .rtmem since the complex return statement
48    is just "return 0".  */
49 /* { dg-final { scan-tree-dump-times ".rtmem" 0 "dce3"} } */
50 
51 /* There should be one IF statement (the complex return statement should
52    collapse down to a simple return 0 without any conditionals).  */
53 /* { dg-final { scan-tree-dump-times "if " 1 "dce3"} } */
54 
55