1  /* { dg-do run } */
       2  /* { dg-options "-O2 -mlzcnt" } */
       3  /* { dg-require-effective-target lzcnt } */
       4  
       5  #include "lzcnt-check.h"
       6  
       7  static int
       8  foo (unsigned int v)
       9  {
      10    return v ? __builtin_clz (v) : 32;
      11  }
      12  
      13  /* returns -1 if x == 0 */
      14  int
      15  __attribute__ ((noinline, noclone))
      16  bar (unsigned int x)
      17  {
      18    return 31 - foo (x);
      19  }
      20  
      21  static void
      22  lzcnt_test ()
      23  {
      24    int r = bar (0);
      25  
      26    if (r != -1)
      27      abort ();
      28  }