minix/lib/libm/man/ieee_test.3
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

98 lines
2.8 KiB
Groff

.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
.\" $NetBSD: ieee_test.3,v 1.12 2011/09/13 07:11:43 njoly Exp $
.\"
.Dd August 3, 2011
.Dt IEEE_TEST 3
.Os
.Sh NAME
.Nm logb ,
.Nm logbf ,
.Nm logbl ,
.Nm scalb ,
.Nm scalbf ,
.Nm significand ,
.Nm significandf
.Nd IEEE test functions
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.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 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 \*(Pm\*(If
= +\*(If;
.Fn logb 0
= -\*(If with a division by zero exception.
.Pp
.Fn scalbn x n
returns
.Fa x Ns \(**(2** Ns Fa n )
computed by exponent manipulation.
.Pp
.Fn significand x
returns
.Fa sig ,
where
.Fa x
:=
.Fa sig No \(** 2** Ns Fa n
with 1 \*[Le]
.Fa sig
\*[Lt] 2.
.Fn significand x
is not defined when
.Fa x
is 0, \*(Pm\*(If, or \*(Na.
.Sh SEE ALSO
.Xr math 3
.Sh STANDARDS
.St -ieee754