---
name: "RtlFindMostSignificantBit"
section: "3w"
platform: "linux"
package: "libwine-dev"
version: "1.4.1-4"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/RtlFindMostSignificantBit"
---

# RtlFindMostSignificantBit(3w)

## NAME

**RtlFindMostSignificantBit** (NTDLL.@)

## SYNOPSIS

CCHAR RtlFindMostSignificantBit\
  (\
   ULONGLONG *ulLong*\
  )

## DESCRIPTION

Find the most significant bit in a **64** bit integer.

## RETURNS

The position of the most significant bit.

## IMPLEMENTATION

Declared in **"winternl.h"**.

Implemented in **"dlls/ntdll/rtlbitmap.c"**.

Debug channel **"ntdll"**.