[fpc-pascal] Bitcounting

[Bart]

Hi,

Does FreePascal have a routine for counting bits?
So that e.g. BitCount(%1001100100001) gives 5 (number of bits that are 1)?

I came up with (extracted from IntToBin()):

function BitCount(N: Int64): Integer;
var
  Q: QWord;
  i: Integer;
begin
  Result := 0;
  Q := QWord(N);
  for i := 0 to (8 * SizeOf(N) - 1) do
  begin
    if ((Q and 1) = 1) then Inc(Result);
    Q := Q shr 1;
  end;
end;

Surely this can be done better?

Bart