1  /* Verify that NRV optimizations are prohibited when the LHS is
       2     something that may be call-clobbered. */
       3  /* { dg-do compile } */
       4  /* { dg-options "-O -fdump-tree-optimized" } */
       5  
       6  typedef struct { int x[20]; void *y; } S;
       7  typedef struct { int a; S b; } T;
       8  S nrv_candidate (void);
       9  void use_result (S);
      10  void make_escape (S *);
      11  void foo (void)
      12  {
      13    S result;
      14    T result_arr[10][5];
      15  
      16    make_escape (&result);
      17    make_escape (&(result_arr[3][4].b));
      18  
      19    /* Neither call should be allowed to use NRV optimization.  */
      20    result = nrv_candidate ();
      21    result_arr[3][4].b = nrv_candidate ();
      22  
      23    use_result (result);
      24    use_result (result_arr[3][4].b);
      25  }
      26  
      27  /* { dg-final { scan-tree-dump-times "return slot optimization" 0 "optimized" } } */