1  /* { dg-do compile } */
       2  /* { dg-require-effective-target popcount } */
       3  /* { dg-require-effective-target int32plus } */
       4  /* { dg-options "-O2 -fdump-tree-optimized" } */
       5  
       6  const unsigned m1  = 0x55555555UL;
       7  const unsigned m2  = 0x33333333UL;
       8  const unsigned m4  = 0x0F0F0F0FUL;
       9  const unsigned h01 = 0x01010101UL;
      10  const int shift = 24;
      11  
      12  int popcount64c(unsigned x)
      13  {
      14      x -= (x >> 1) & m1;
      15      x = (x & m2) + ((x >> 2) & m2);
      16      x = (x + (x >> 4)) & m4;
      17      return (x * h01) >> shift;
      18  }
      19  
      20  /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 1 "optimized" } } */
      21  
      22