mirror of
https://github.com/freebsd/freebsd-src
synced 2024-11-05 18:22:52 +00:00
107 lines
3 KiB
Groff
107 lines
3 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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
|
|
.\" $Id$
|
|
.\"
|
|
.Dd March 10, 1994
|
|
.Dt IEEE_TEST 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm logb ,
|
|
.Nm logbf ,
|
|
.Nm scalb ,
|
|
.Nm scalbf ,
|
|
.Nm significand ,
|
|
.Nm significandf
|
|
.Nd IEEE test functions
|
|
.Sh SYNOPSIS
|
|
.Fd #include <math.h>
|
|
.Ft double
|
|
.Fn logb "double x"
|
|
.Ft float
|
|
.Fn logbf "float x"
|
|
.Ft double
|
|
.Fn scalb "double x" "double n"
|
|
.Ft float
|
|
.Fn scalbf "float x" "float 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
|
|
and
|
|
.Fn logbf x
|
|
return
|
|
.Fa x Ns 's exponent
|
|
.Fa n ,
|
|
a signed integer converted to double\-precision floating\-point.
|
|
.Fn logb \*(Pm\*(If
|
|
= +\*(If;
|
|
.Fn logb 0
|
|
= -\*(If with a division by zero exception.
|
|
.Pp
|
|
.Fn scalbn x n
|
|
and
|
|
.Fn scalbnf x n
|
|
return
|
|
.Fa x Ns \(**(2** Ns Fa n )
|
|
computed by exponent manipulation.
|
|
.Pp
|
|
.Fn significand x
|
|
and
|
|
.Fn significandf x
|
|
return
|
|
.Fa sig ,
|
|
where
|
|
.Fa x
|
|
:=
|
|
.Fa sig No \(** 2** Ns Fa n
|
|
with 1 \(<=
|
|
.Fa sig
|
|
< 2.
|
|
.Fn significand x
|
|
and
|
|
.Fn significandf x
|
|
are not defined when
|
|
.Fa x
|
|
is 0, \*(Pm\*(If, or \*(Na.
|
|
.Sh SEE ALSO
|
|
.Xr ieee 3 ,
|
|
.Xr math 3
|
|
|
|
.Sh STANDARDS
|
|
.St -ieee754
|