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+.\" $NetBSD: bitops.3,v 1.6 2020/01/13 16:11:53 uwe Exp $
+.\"
+.\" Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd December 4, 2012
+.Dt BITOPS 3
+.Os
+.Sh NAME
+.Nm bitops
+.Nd functions related to bits and integers
+.Sh SYNOPSIS
+.In sys/bitops.h
+.Sh DESCRIPTION
+The
+.In sys/bitops.h
+header provides macros and
+.Vt static inline
+functions related to bits and integers.
+Among these are:
+.Bl -tag -width ".Xr fast_divide32 3" -offset indent
+.It Xr bitmap 3
+bitmap manipulation macros
+.It Xr fast_divide32 3
+a function for fast 32-bit division
+.It Xr ffs32 3
+functions to find the first and last set bit in integers of type
+.Vt uint32_t
+and
+.Vt uint64_t
+.It Xr ilog2 3
+a macro for binary logarithm
+.El
+.Sh SEE ALSO
+.Xr bits 3 ,
+.Xr bitstring 3 ,
+.Xr cdefs 3 ,
+.Xr param 3
+.Sh HISTORY
+The
+.In sys/bitops.h
+header first appeared in
+.Nx 4.0 .