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+.\"	$OpenBSD: logb.3,v 1.11 2025/06/07 10:33:06 schwarze Exp $
+.\" Copyright (c) 1985, 1991 Regents of the University of California.
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     from: @(#)ieee.3	6.4 (Berkeley) 5/6/91
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt LOGB 3
+.Os
+.Sh NAME
+.Nm logb ,
+.Nm logbf ,
+.Nm logbl ,
+.Nm scalb ,
+.Nm scalbf ,
+.Nm scalbl ,
+.Nm significand ,
+.Nm significandf
+.Nd IEEE test functions
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn logb "double x"
+.Ft float
+.Fn logbf "float x"
+.Ft long double
+.Fn logbl "long double x"
+.Ft double
+.Fn scalb "double x" "double n"
+.Ft float
+.Fn scalbf "float x" "float n"
+.Ft long double
+.Fn scalbl "long double x" "long double n"
+.Ft double
+.Fn significand "double x"
+.Ft float
+.Fn significandf "float x"
+.Sh DESCRIPTION
+These functions allow users to test conformance to
+.St -ieee754 .
+Their use is not otherwise recommended.
+.Pp
+.Fn logb x
+returns
+.Fa x Ns 's exponent
+.Fa n ,
+a signed integer converted to double\-precision floating\-point.
+.Fn logb \(+-infinity
+= +infinity;
+.Fn logb 0
+= -infinity with a division by zero exception.
+.Fn logbf
+is the single precision form of
+.Fn logb .
+.Fn logbl
+is the extended precision form of
+.Fn logb .
+.Pp
+.Fn scalb x n
+returns
+.Fa x Ns *(2** Ns Fa n )
+computed by exponent manipulation.
+.Fn scalbf
+is the single precision form of
+.Fn scalb .
+.Fn scalbl
+is the extended precision form of
+.Fn scalb .
+.Pp
+.Fn significand x
+returns
+.Fa sig ,
+where
+.Fa x
+:=
+.Fa sig No * 2** Ns Fa n
+with 1 \(<=
+.Fa sig
+< 2.
+.Fn significand x
+is not defined when
+.Fa x
+is 0, \(+-infinity, or NaN.
+.Fn significandf
+is the single precision for of
+.Fn significand .
+.Sh SEE ALSO
+.Xr fpclassify 3 ,
+.Xr ilogb 3 ,
+.Xr scalbn 3
+.Sh STANDARDS
+.St -ieee754