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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 #ifndef PLATFORM_UTILS_WIN_H_ |
| 6 #define PLATFORM_UTILS_WIN_H_ |
| 7 |
| 8 #include <intrin.h> |
| 9 |
| 10 namespace dart { |
| 11 |
| 12 inline int Utils::CountTrailingZeros(uint32_t x) { |
| 13 unsigned long result; // NOLINT |
| 14 _BitScanReverse(&result, x); |
| 15 return reinterpret_cast<int>(result); |
| 16 }; |
| 17 |
| 18 inline int Utils::CountTrailingZeros(uint64_t x) { |
| 19 unsigned long result; // NOLINT |
| 20 _BitScanReverse64(&result, x); |
| 21 return reinterpret_cast<int>(result); |
| 22 }; |
| 23 |
| 24 } // namespace dart |
| 25 |
| 26 #endif // PLATFORM_UTILS_WIN_H_ |
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