runtime/platform/utils.cc - Issue 9209001: Move utils.h and utils.cc from runtime/vm to runtime/platform

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Issue 9209001: Move utils.h and utils.cc from runtime/vm to runtime/platform (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart

Patch Set: Addresed new comments from ager@ Created 8 years, 11 months ago

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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file	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	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.	3 // BSD-style license that can be found in the LICENSE file.

4	4

5 #include "vm/utils.h"	5 #include "platform/utils.h"

6	6

7 namespace dart {	7 namespace dart {

8	8

9 // Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,	9 // Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,

10 // figure 3-3, page 48, where the function is called clp2.	10 // figure 3-3, page 48, where the function is called clp2.

11 uint32_t Utils::RoundUpToPowerOfTwo(uint32_t x) {	11 uint32_t Utils::RoundUpToPowerOfTwo(uint32_t x) {

12 x = x - 1;	12 x = x - 1;

13 x = x \| (x >> 1);	13 x = x \| (x >> 1);

14 x = x \| (x >> 2);	14 x = x \| (x >> 2);

15 x = x \| (x >> 4);	15 x = x \| (x >> 4);

(...skipping 66 matching lines...) Expand 10 before \| Expand all \| Expand 10 after Loading...
82 a = (a + 0x7ed55d16) + (a << 12);	82 a = (a + 0x7ed55d16) + (a << 12);

83 a = (a ^ 0xc761c23c) ^ (a >> 19);	83 a = (a ^ 0xc761c23c) ^ (a >> 19);

84 a = (a + 0x165667b1) + (a << 5);	84 a = (a + 0x165667b1) + (a << 5);

85 a = (a + 0xd3a2646c) ^ (a << 9);	85 a = (a + 0xd3a2646c) ^ (a << 9);

86 a = (a + 0xfd7046c5) + (a << 3);	86 a = (a + 0xfd7046c5) + (a << 3);

87 a = (a ^ 0xb55a4f09) ^ (a >> 16);	87 a = (a ^ 0xb55a4f09) ^ (a >> 16);

88 return static_cast<uint32_t>(a);	88 return static_cast<uint32_t>(a);

89 }	89 }

90	90

91 } // namespace dart	91 } // namespace dart

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