1. Fix one bug on EBC for GetPowerOfTwo64.c
[mirror_edk2.git] / MdePkg / Library / BaseLib / GetPowerOfTwo64.c
CommitLineData
878ddf1f 1/** @file\r
2 Math worker functions.\r
3\r
4 Copyright (c) 2006, Intel Corporation<BR>\r
5 All rights reserved. This program and the accompanying materials\r
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
8 http://opensource.org/licenses/bsd-license.php\r
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
15#include "BaseLibInternals.h"\r
16\r
17/**\r
18 Returns the value of the highest bit set in a 64-bit value. Equivalent to\r
19 1 << HighBitSet64(x).\r
20\r
21 This function computes the value of the highest bit set in the 64-bit value\r
22 specified by Operand. If Operand is zero, then zero is returned.\r
23\r
24 @param Operand The 64-bit operand to evaluate.\r
25\r
26 @return 1 << HighBitSet64(Operand)\r
27 @retval 0 Operand is zero.\r
28\r
29**/\r
30UINT64\r
31EFIAPI\r
32GetPowerOfTwo64 (\r
33 IN UINT64 Operand\r
34 )\r
35{\r
36 INTN BitPos;\r
37\r
4748b24d 38 BitPos = HighBitSet64 (Operand);\r
39 return BitPos >= 0 ? LShiftU64 (1, BitPos) : 0;\r
878ddf1f 40}\r