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| author | Ben Pfaff <blp@cs.stanford.edu> | 2008-07-12 10:50:41 -0700 |
|---|---|---|
| committer | Ben Pfaff <blp@cs.stanford.edu> | 2008-07-12 11:27:15 -0700 |
| commit | 7080851f5a8270aee50e8545d28c48c6c75decc1 (patch) | |
| tree | 453a13b78a8c62e4165a1b15d8017af233454616 /doc/posix-functions/isnan.texi | |
| parent | 4ade019ba68356b5d58a94dccff159a1fde85ad5 (diff) | |
| download | gnulib-7080851f5a8270aee50e8545d28c48c6c75decc1.tar.gz | |
Add isnan module.
Diffstat (limited to 'doc/posix-functions/isnan.texi')
| -rw-r--r-- | doc/posix-functions/isnan.texi | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/doc/posix-functions/isnan.texi b/doc/posix-functions/isnan.texi index 90395c7d30..01816868c0 100644 --- a/doc/posix-functions/isnan.texi +++ b/doc/posix-functions/isnan.texi @@ -4,10 +4,24 @@ POSIX specification: @url{http://www.opengroup.org/susv3xsh/isnan.html} -Gnulib module: --- +Gnulib module: isnan Portability problems fixed by Gnulib: @itemize +@item +@code{isnan} was introduced with C99 and is thus commonly not present +on pre-C99 systems. +@item +On IRIX 6.5 with @code{cc}, @code{isnan} does not recognize some NaNs. +@item +On NetBSD/i386 and glibc/ia64, @code{isnan} does not recognize some +forms of NaNs, such as pseudo-NaNs, pseudo-Infinities, and +unnormalized numbers. +@item +On i686 and @var{x}86-64, @code{__builtin_isnanl} (and thus +@code{isnan} implementations based on it) in GCC 4.0 and later does +not recognize pseudo-denormals as NaNs, and similarly for +pseudo-zeroes, unnormalized numbers, and pseudo-denormals on ia64. @end itemize Portability problems not fixed by Gnulib: |