// Copyright 2014 Samsung Electronics Co., Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

var mask = 0xff0f;
var numOnes = 0;

while (mask)
{
  if (!(mask & 1))
    break;

  mask >>= 1;
  numOnes++;
}

assert(numOnes === 4);