fls64
Prev | Bit Operations | Next

## Name

fls64 — find last set bit in a 64-bit word

## Synopsis

`int fls64 (` | __u64 x`)`;

## Arguments

`x`

  the word to search

## Description

This is defined in a similar way as the libc and compiler builtin ffsll, but returns the position of the most significant set bit.

fls64(value) returns 0 if value is 0 or the position of the last set bit if value is nonzero. The last (most significant) bit is at position 64.

Prev | Up | Next
fls | Home | Chapter 3. Basic Kernel Library Functions