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

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fno-tree-fre -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   struct tree_common common;
  19   double alias_set;
  20 };
  21 union tree_node
  22 {
  23   struct tree_common common;
  24   struct tree_type type;
  25 };
  26 long
  27 foo (t, set)
  28      tree t;
  29      double set;
  30 {
  31   if (tree_code_type[t->common.code] != 't')
  32     abort ();
  33
  34   t->type.alias_set = set;
  35
  36   if (t->common.code == 42)
  37     return 1;
  38   else
  39     return 0;
  40 }
  41 /* There should be precisely one load of common.code.  If there is
  42    more than one, then the dominator optimizations failed.  */
  43 /* { dg-final { scan-tree-dump-times "common.code" 1 "dom2" } } */