The Tor Browser: nsprpub/pr/src/misc/prlog2.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

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

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

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

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

     6 #include "prbit.h"

     8 /*

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

    10 */

    11 PR_IMPLEMENT(PRIntn) PR_CeilingLog2(PRUint32 n)

    12 {

    13     PRIntn log2;

    14     PR_CEILING_LOG2(log2, n);

    15     return log2;

    16 }

    18 /*

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

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

    21 */

    22 PR_IMPLEMENT(PRIntn) PR_FloorLog2(PRUint32 n)

    23 {

    24     PRIntn log2;

    25     PR_FLOOR_LOG2(log2, n);

    26     return log2;

    27 }

The Tor Browser / file revision