gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-18.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-fre1" } */
   3
   4 struct a
   5 {
   6   union
   7   {
   8     int a;
   9     int b;
  10   };
  11   union
  12   {
  13     int c;
  14     int d;
  15   };
  16 };
  17
  18 int f(struct a *c)
  19 {
  20   int d = c->a;
  21   c->c = 1;
  22   return c->a + d;
  23 }
  24
  25 /* We should have CSEd the load from c->a.  */
  26
  27 /* { dg-final { scan-tree-dump-times "c_.*\\\.a" 1 "fre1" } } */