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e1f414b6 | 1 | /** @file\r |
2 | Math worker functions.\r | |
3 | \r | |
a58b9d96 | 4 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r |
bb817c56 | 5 | This program and the accompanying materials\r |
e1f414b6 | 6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
127010dd | 8 | http://opensource.org/licenses/bsd-license.php.\r |
e1f414b6 | 9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
18 | #include "BaseLibInternals.h"\r | |
19 | \r | |
20 | /**\r | |
21 | Returns the value of the highest bit set in a 64-bit value. Equivalent to\r | |
9aa049d9 | 22 | 1 << log2(x).\r |
e1f414b6 | 23 | \r |
24 | This function computes the value of the highest bit set in the 64-bit value\r | |
25 | specified by Operand. If Operand is zero, then zero is returned.\r | |
26 | \r | |
27 | @param Operand The 64-bit operand to evaluate.\r | |
28 | \r | |
29 | @return 1 << HighBitSet64(Operand)\r | |
30 | @retval 0 Operand is zero.\r | |
31 | \r | |
32 | **/\r | |
33 | UINT64\r | |
34 | EFIAPI\r | |
35 | GetPowerOfTwo64 (\r | |
36 | IN UINT64 Operand\r | |
37 | )\r | |
38 | {\r | |
39 | if (Operand == 0) {\r | |
40 | return 0;\r | |
41 | }\r | |
42 | \r | |
a58b9d96 | 43 | return LShiftU64 (1, (UINTN) HighBitSet64 (Operand));\r |
e1f414b6 | 44 | }\r |