.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
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.\" References consulted:
.\" Linux libc source code
.\" Modified 1995-08-14 by Arnt Gulbrandsen <agulbra@troll.no>
.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
-.TH POW 3 2010-09-12 "" "Linux Programmer's Manual"
+.TH POW 3 2014-12-31 "" "Linux Programmer's Manual"
.SH NAME
pow, powf, powl \- power functions
.SH SYNOPSIS
.SH DESCRIPTION
The
.BR pow ()
-function returns the value of \fIx\fP raised to the
-power of \fIy\fP.
+function returns the value of
+.I x
+raised to the
+power of
+.IR y .
.SH RETURN VALUE
On success, these functions return the value of
.I x
An underflow floating-point exception
.RB ( FE_UNDERFLOW )
is raised.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
C99, POSIX.1-2001.
The variant returning
.I double
also conforms to
SVr4, 4.3BSD, C89.
.SH BUGS
+On 64-bits,
+.\"
+.\" https://sourceware.org/bugzilla/show_bug.cgi?id=13932
+.BR pow ()
+may be more than 10,000 times slower for some (rare) inputs
+than for other nearby inputs.
+This affects only
+.BR pow (),
+and not
+.BR powf ()
+nor
+.BR powl ().
+
In glibc 2.9 and earlier,
.\"
.\" http://sources.redhat.com/bugzilla/show_bug.cgi?id=6776
generates a bogus invalid floating-point exception
.RB ( FE_INVALID )
in addition to the overflow or underflow exception.
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR cbrt (3),
.BR cpow (3),
.BR sqrt (3)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.