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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/. */ | |
5 | |
6 #include "prbit.h" | |
7 | |
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 } | |
17 | |
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 } | |
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