gcc/testsuite/gcc.dg/tree-ssa/popcount2.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */
   3
   4 int
   5 __attribute__ ((noinline, noclone))
   6 foo (long b)
   7 {
   8     int c = 0;
   9
  10     while (b) {
  11         b &= b - 1;
  12         c++;
  13     }
  14     return c;
  15 }
  16
  17 int main()
  18 {
  19   if (foo (7) != 3)
  20    __builtin_abort ();
  21   if (foo (0) != 0)
  22    __builtin_abort ();
  23   if (foo (0xff) != 8)
  24    __builtin_abort ();
  25   return 0;
  26 }
  27
  28 /* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized" } } */