/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "prbit.h"

/*

** Compute the log of the least power of 2 greater than or equal to n

*/

PR_IMPLEMENT(PRIntn) PR_CeilingLog2(PRUint32 n) {

  PRIntn log2;

  PR_CEILING_LOG2(log2, n);

  return log2;

}

/*

** Compute the log of the greatest power of 2 less than or equal to n.

** This really just finds the highest set bit in the word.

*/

PR_IMPLEMENT(PRIntn) PR_FloorLog2(PRUint32 n) {

  PRIntn log2;

  PR_FLOOR_LOG2(log2, n);

  return log2;

}