RtlFindLeastSignificantBit - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

/**
 * The RtlFindLeastSignificantBit routine returns the zero-based position of the least significant nonzero bit in its parameter.
 *
 * \param Set The 64-bit value to be searched for its least significant nonzero bit.
 * \return The zero-based bit position of the least significant nonzero bit, or -1 if every bit is zero.
 * \sa https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/nf-wdm-rtlfindleastsignificantbit
 */
NTSYSAPI
CCHAR
NTAPI
RtlFindLeastSignificantBit(
    _In_ ULONGLONG Set
    );

#endif

View code on GitHub
// wdm.h

NTSYSAPI CCHAR RtlFindLeastSignificantBit(
  [in] ULONGLONG Set
);
View the official Windows Driver Kit DDI reference

NtDoc

This function is documented in Windows Driver Kit.

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Windows Driver Kit DDI reference (nf-wdm-rtlfindleastsignificantbit)

RtlFindLeastSignificantBit function

Description

The RtlFindLeastSignificantBit routine returns the zero-based position of the least significant nonzero bit in its parameter.

Parameters

Set [in]

The 64-bit value to be searched for its least significant nonzero bit.

Return value

The zero-based bit position of the least significant nonzero bit, or -1 if every bit is zero.

See also

RtlFindMostSignificantBit

View the official Windows Driver Kit DDI reference

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