The Tor Browser / file comparison
comparison: nsprpub/pr/src/misc/prlog2.c
nsprpub/pr/src/misc/prlog2.c
- branch
- TOR_BUG_3246
- changeset 5
- 4ab42b5ab56c
equal
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| -1:000000000000 | 0:7e16584df964 |
|---|---|
| 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 } |
