1  /* { dg-do compile } */
       2  /* { dg-skip-if "" { *-*-* } { "-fno-fat-lto-objects" } { "" } } */
       3  /* { dg-options "-fdump-tree-optimized-blocks" } */
       4  
       5  unsigned register1;
       6  unsigned register2;
       7  
       8  void busy_wait_for_register (int x)
       9  {
      10    volatile unsigned* ptr;
      11    switch(x) {
      12      case 0x1111:
      13      ptr = &register1;
      14      break;
      15  
      16      case 0x2222:
      17      ptr = &register2;
      18      break;
      19  
      20      default:
      21      return;
      22    }
      23    while (*ptr) {}
      24  }
      25  
      26  /* { dg-final { scan-tree-dump "loop depth 1" "optimized" } } */