| /* -*- 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; |
| } |
