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

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