1 /*++ 2 3 Copyright (c) 2004 - 2006, Intel Corporation. All rights reserved.<BR> 4 This program and the accompanying materials 5 are licensed and made available under the terms and conditions of the BSD License 6 which accompanies this distribution. The full text of the license may be found at 7 http://opensource.org/licenses/bsd-license.php 8 9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 12 13 Module Name: 14 15 GetPowerOfTwo64.c 16 17 Abstract: 18 19 Math worker functions. 20 21 --*/ 22 23 #include "BaseLibInternals.h" 24 25 /** 26 Returns the value of the highest bit set in a 64-bit value. Equivalent to 27 1 << HighBitSet64(x). 28 29 This function computes the value of the highest bit set in the 64-bit value 30 specified by Operand. If Operand is zero, then zero is returned. 31 32 @param Operand The 64-bit operand to evaluate. 33 34 @return 1 << HighBitSet64(Operand) 35 @retval 0 Operand is zero. 36 37 **/ 38 UINT64 39 EFIAPI 40 GetPowerOfTwo64 ( 41 IN UINT64 Operand 42 ) 43 { 44 if (Operand == 0) { 45 return 0; 46 } 47 48 return LShiftU64 (1, (UINTN) HighBitSet64 (Operand)); 49 } 50
