gnu/dist/gcc4/gcc/testsuite/gcc.dg/tree-ssa/20030710-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-dom3" } */
   3
   4 extern void abort (void);
   5 union tree_node;
   6 typedef union tree_node *tree;
   7 struct tree_vec
   8 {
   9   int length;
  10   tree a[1];
  11 };
  12 struct tree_type
  13 {
  14   tree binfo;
  15 };
  16 union tree_node
  17 {
  18   struct tree_type type;
  19   struct tree_vec vec;
  20 };
  21 void
  22 record_component_aliases (type)
  23      tree type;
  24 {
  25   if (type->type.binfo->vec.length)
  26     abort ();
  27   for (; ((
  28             {
  29             const tree __z = type->type.binfo;
  30             if (type->type.binfo->vec.length)
  31             abort ();
  32  type->type.binfo->vec.a[4];}
  33           )->vec.length);)
  34     {
  35       if (4 >= type->type.binfo->vec.length)
  36         abort ();
  37       blah ();
  38     }
  39 }
  40
  41 /* The call to blah should have been eliminated.  If the call is not
  42    eliminated, then dominator optimizations failed and it'll be
  43    impossible to delete other unnecessary code.  */
  44 /* { dg-final { scan-tree-dump-not "blah \\(\\)" "dom3" } } */
  45
  46 /* There should be two IF conditionals.  */
  47 /* { dg-final { scan-tree-dump-times "if " 2 "dom3"} } */
  48
  49 /* There should be a single load of type.binfo.  */
  50 /* { dg-final { scan-tree-dump-times "type\\.binfo" 1 "dom3"} } */
  51
  52 /* There should be two loads of vec.length.  */
  53 /* { dg-final { scan-tree-dump-times "vec.length" 2 "dom3"} } */
  54
  55 /* { dg-final { cleanup-tree-dump "dom3" } } */