gcc/testsuite/gcc.dg/tree-ssa/20030814-6.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-dom2" } */
   3
   4 extern void abort (void);
   5 union tree_node;
   6 typedef union tree_node *tree;
   7 enum tree_code
   8 {
   9   LAST_AND_UNUSED_TREE_CODE
  10 };
  11 extern const char tree_code_type[];
  12 struct tree_common
  13 {
  14   enum tree_code code:8;
  15 };
  16 struct tree_type
  17 {
  18   double alias_set;
  19 };
  20 union tree_node
  21 {
  22   struct tree_common common;
  23   struct tree_type type;
  24 };
  25 long
  26 foo (t, set)
  27      tree t;
  28      double set;
  29 {
  30   if (tree_code_type[t->common.code] != 't')
  31     abort ();
  32
  33   t->type.alias_set = set;
  34
  35   if (t->common.code == 42)
  36     return 1;
  37   else
  38     return 0;
  39 }
  40 /* There should be precisely one load of common.code.  If there is
  41    more than one, then the dominator optimizations failed.  */
  42 /* ??? Will fail until we properly distinguish member stores.  At
  43    present the write to type.alias_set kills the previous load.  */
  44 /* { dg-final { scan-tree-dump-times "common.code" 1 "dom2" { xfail *-*-* } } } */
  45 /* { dg-final { cleanup-tree-dump "dom2" } } */