RtlFindMostSignificantBit function (wdm.h)
The RtlFindMostSignificantBit routine returns the zero-based position of the most significant nonzero bit in its parameter.
Syntax
NTSYSAPI CCHAR RtlFindMostSignificantBit(
[in] ULONGLONG Set
);
Parameters
[in] Set
The 64-bit value to be searched for its most significant nonzero bit.
Return value
The zero-based bit position of the most significant nonzero bit, or -1 if every bit is zero.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | Any level |