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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseLib/HighBitSet64.c
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
12 #include "BaseLibInternals.h"
15 Returns the bit position of the highest bit set in a 64-bit value. Equivalent
18 This function computes the bit position of the highest bit set in the 64-bit
19 value specified by Operand. If Operand is zero, then -1 is returned.
20 Otherwise, a value between 0 and 63 is returned.
22 @param Operand The 64-bit operand to evaluate.
24 @retval 0..63 Position of the highest bit set in Operand if found.
25 @retval -1 Operand is zero.
34 if (Operand
== (UINT32
)Operand
) {
36 // Operand is just a 32-bit integer
38 return HighBitSet32 ((UINT32
)Operand
);
42 // Operand is really a 64-bit integer
44 if (sizeof (UINTN
) == sizeof (UINT32
)) {
45 return HighBitSet32 (((UINT32
*)&Operand
)[1]) + 32;
47 return HighBitSet32 ((UINT32
)RShiftU64 (Operand
, 32)) + 32;