1  /* { dg-do compile } */
       2  /* { dg-options "-fno-strict-overflow -O2 -fdump-tree-optimized" } */
       3  
       4  /* Source: Ian Lance Taylor.  */
       5  
       6  /* VRP test.  We can not simplify the conditional when not using
       7     strict overflow semantics.  We don't test this with
       8     -fstrict-overflow because it turns into an infinite loop.  That is
       9     OK but it would also be OK to not do that.  */
      10  
      11  int
      12  foo ()
      13  {
      14    int i, bits;
      15    for (i = 1, bits = 1; i > 0; i += i)
      16      ++bits;
      17    return bits - sizeof(int) * __CHAR_BIT__;
      18  }
      19  
      20  /* { dg-final { scan-tree-dump "return 0" "optimized" } } */