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/* -*- 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
#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;
}