'\" t
.\"     Title: fls
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: June 2017
.\"    Manual: Basic C Library Functions
.\"    Source: Kernel Hackers Manual 4.11.3
.\"  Language: English
.\"
.TH "FLS" "9" "June 2017" "Kernel Hackers Manual 4\&.11\&" "Basic C Library Functions"
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.SH "NAME"
fls \- find last set bit in word
.SH "SYNOPSIS"
.HP \w'int\ fls('u
.BI "int fls(int\ " "x" ");"
.SH "ARGUMENTS"
.PP
\fIint x\fR
.RS 4
the word to search
.RE
.SH "DESCRIPTION"
.PP
This is defined in a similar way as the libc and compiler builtin ffs, but returns the position of the most significant set bit\&.
.PP
fls(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 32\&.
.SH "COPYRIGHT"
.br