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+.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd February 8, 2003
+.Dt FPCLASSIFY 3
+.Os
+.Sh NAME
+.Nm fpclassify
+.Nd "classify a floating-point number"
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In math.h
+.Ft int
+.Fn fpclassify "real-floating x"
+.Sh DESCRIPTION
+The
+.Fn fpclassify
+macro takes an argument of
+.Va x
+and returns one of the following manifest constants.
+.Bl -tag -width ".Dv FP_SUBNORMAL"
+.It Dv FP_INFINITE
+Indicates that
+.Va x
+is an infinite number.
+.It Dv FP_NAN
+Indicates that
+.Va x
+is not a number (NaN).
+.It Dv FP_NORMAL
+Indicates that
+.Va x
+is a normalized number.
+.It Dv FP_SUBNORMAL
+Indicates that
+.Va x
+is a denormalized number.
+.It Dv FP_ZERO
+Indicates that
+.Va x
+is zero (0 or -0).
+.El
+.Sh SEE ALSO
+.Xr math 3
+.Sh STANDARDS
+The
+.Fn fpclassify
+macro conforms to
+.St -isoC-99 .
+.Sh HISTORY
+The
+.Fn fpclassify
+macro was added in
+.Fx 5.1 .
+.Sh BUGS
+By default, the DEC Alpha architecture does not support IEEE rounding.
+See compiler documentation for additional details.