2011-03-18 16:52:16 +01:00
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.\" Copyright (c) 1985, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91
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2013-12-06 12:04:52 +01:00
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.\" $NetBSD: ieee_test.3,v 1.12 2011/09/13 07:11:43 njoly Exp $
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2011-03-18 16:52:16 +01:00
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.\"
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2013-12-06 12:04:52 +01:00
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.Dd August 3, 2011
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2011-03-18 16:52:16 +01:00
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.Dt IEEE_TEST 3
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.Os
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.Sh NAME
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.Nm logb ,
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.Nm logbf ,
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.Nm logbl ,
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.Nm scalb ,
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.Nm scalbf ,
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.Nm significand ,
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.Nm significandf
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.Nd IEEE test functions
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.Sh LIBRARY
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.Lb libm
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.Sh SYNOPSIS
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.In math.h
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.Ft double
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.Fn logb "double x"
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.Ft float
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.Fn logbf "float x"
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.Ft long double
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.Fn logbl "long double x"
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.Ft double
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.Fn scalb "double x" "double n"
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.Ft float
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.Fn scalbf "float x" "float n"
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.Ft double
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.Fn significand "double x"
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.Ft float
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.Fn significandf "float x"
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.Sh DESCRIPTION
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These functions allow users to test conformance to
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.St -ieee754 .
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Their use is not otherwise recommended.
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.Pp
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.Fn logb x
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returns
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.Fa x Ns 's exponent
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.Fa n ,
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a signed integer converted to double\-precision floating\-point.
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.Fn logb \*(Pm\*(If
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= +\*(If;
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.Fn logb 0
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= -\*(If with a division by zero exception.
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.Pp
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.Fn scalbn x n
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returns
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.Fa x Ns \(**(2** Ns Fa n )
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computed by exponent manipulation.
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.Pp
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.Fn significand x
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returns
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.Fa sig ,
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where
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.Fa x
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:=
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.Fa sig No \(** 2** Ns Fa n
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with 1 \*[Le]
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.Fa sig
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\*[Lt] 2.
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.Fn significand x
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is not defined when
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.Fa x
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is 0, \*(Pm\*(If, or \*(Na.
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.Sh SEE ALSO
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.Xr math 3
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.Sh STANDARDS
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.St -ieee754
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