gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-19.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   int e;
  17 };
  18
  19 int f(struct a *c)
  20 {
  21   int d;
  22   c->e = 2;
  23   d = c->a;
  24   c->c = 1;
  25   return c->a + d;
  26 }
  27
  28 /* We should have CSEd the load from c->a.  */
  29
  30 /* { dg-final { scan-tree-dump-times "c_.*\\\.a" 1 "fre1" } } */
  31 /* { dg-final { cleanup-tree-dump "fre1" } } */