text: /*
   * Copyright (c) 2014-2017, Arm Limited and affiliates.
   * SPDX-License-Identifier: Apache-2.0
   *
   * 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.
   */
  #include "nsconfig.h"
  #include "ns_types.h"
  #include "isqrt.h"
  
  /**
   * \brief Calculates integer square root
   *
   * Algorithm is from http://www.codecodex.com/wiki/Calculate_an_integer_square_root
   *
   * \param n number
   *
   * \return square root of the number (rounded down)
   */
  
  uint32_t isqrt32(uint32_t n)
  {
      uint32_t root, remainder, place;
  
      root = 0;
      remainder = n;
      place = 0x40000000;
  
      while (place > remainder) {
          place = place >> 2;
      }
      while (place)  {
          if (remainder >= root + place) {
              remainder = remainder - root - place;
              root = root + (place << 1);
          }
          root = root >> 1;
          place = place >> 2;
      }
      return root;
  }
  