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annotate doc/posix-functions/isnan.texi @ 17040:2b2ed538a898

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update from texinfo
author Karl Berry <karl@freefriends.org>
date Mon, 13 Aug 2012 15:48:24 -0700
parents da62858ef2f6
children
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1 @node isnan
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2 @section @code{isnan}
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3 @findex isnan
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4
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5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/isnan.html}
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6
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7 Gnulib module: isnan
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @item
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12 This macro is missing on some platforms:
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13 MSVC 9.
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14 @item
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15 @code{isnan} was introduced with C99 and is thus commonly not present
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16 on pre-C99 systems.
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17 @item
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18 @code{isnan} is not a macro on some platforms:
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19 IRIX 6.5, OSF/1 5.1 with gcc, Solaris 11 2011-11.
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20 @item
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21 On IRIX 6.5 with @code{cc}, @code{isnan} does not recognize some NaNs.
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22 @item
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23 On NetBSD/i386 and glibc/ia64, @code{isnan} does not recognize some
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24 forms of NaNs, such as pseudo-NaNs, pseudo-Infinities, and
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25 unnormalized numbers.
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26 @item
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27 On i686 and @var{x}86-64, @code{__builtin_isnanl} (and thus
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28 @code{isnan} implementations based on it) in GCC 4.0 and later does
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29 not recognize pseudo-denormals as NaNs, and similarly for
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30 pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64.
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31 @end itemize
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32
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33 Portability problems not fixed by Gnulib:
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34 @itemize
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35 @end itemize