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Functions
HighBitSet64.c File Reference
#include "BaseLibInternals.h"

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Functions

INTN EFIAPI HighBitSet64 (IN UINT64 Operand)
 

Detailed Description

Math worker functions.

Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file HighBitSet64.c.

Function Documentation

◆ HighBitSet64()

INTN EFIAPI HighBitSet64 ( IN UINT64  Operand)

Returns the bit position of the highest bit set in a 64-bit value. Equivalent to log2(x).

This function computes the bit position of the highest bit set in the 64-bit value specified by Operand. If Operand is zero, then -1 is returned. Otherwise, a value between 0 and 63 is returned.

Parameters
OperandThe 64-bit operand to evaluate.
Return values
0..63Position of the highest bit set in Operand if found.
-1Operand is zero.

Definition at line 27 of file HighBitSet64.c.