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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // This file defines some bit utilities. | 5 // This file defines some bit utilities. |
6 | 6 |
7 #ifndef BASE_BITS_H_ | 7 #ifndef BASE_BITS_H_ |
8 #define BASE_BITS_H_ | 8 #define BASE_BITS_H_ |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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34 // Returns the integer i such as 2^(i-1) < n <= 2^i | 34 // Returns the integer i such as 2^(i-1) < n <= 2^i |
35 inline int Log2Ceiling(uint32 n) { | 35 inline int Log2Ceiling(uint32 n) { |
36 if (n == 0) { | 36 if (n == 0) { |
37 return -1; | 37 return -1; |
38 } else { | 38 } else { |
39 // Log2Floor returns -1 for 0, so the following works correctly for n=1. | 39 // Log2Floor returns -1 for 0, so the following works correctly for n=1. |
40 return 1 + Log2Floor(n - 1); | 40 return 1 + Log2Floor(n - 1); |
41 } | 41 } |
42 } | 42 } |
43 | 43 |
| 44 // Round up |size| to a multiple of alignment, which must be a power of two. |
| 45 inline size_t Align(size_t size, size_t alignment) { |
| 46 DCHECK_EQ(alignment & (alignment - 1), 0u); |
| 47 return (size + alignment - 1) & ~(alignment - 1); |
| 48 } |
| 49 |
44 } // namespace bits | 50 } // namespace bits |
45 } // namespace base | 51 } // namespace base |
46 | 52 |
47 #endif // BASE_BITS_H_ | 53 #endif // BASE_BITS_H_ |
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