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-.\" Copyright (C) 2022 Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH powerof2 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-powerof2 \- test if a value is a power of 2
-.SH LIBRARY
-Standard C library
-.RI ( libc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/param.h>
-.P
-.BI "int powerof2(" x );
-.fi
-.SH DESCRIPTION
-This macro returns true if
-.I x
-is a power of 2,
-and false otherwise.
-.P
-.B 0
-is considered a power of 2.
-This can make sense considering wrapping of unsigned integers,
-and has interesting properties.
-.SH RETURN VALUE
-True or false,
-if
-.I x
-is a power of 2 or not,
-respectively.
-.SH STANDARDS
-BSD.
-.SH CAVEATS
-The arguments may be evaluated more than once.
-.P
-Because this macro is implemented using bitwise operations,
-some negative values can invoke undefined behavior.
-For example,
-the following invokes undefined behavior:
-.IR "powerof2(INT_MIN);".
-Call it only with unsigned types to be safe.
-.SH SEE ALSO
-.BR stdc_bit_ceil (3),
-.BR stdc_bit_floor (3)