isfinite
========

POSIX specification:
 http://www.opengroup.org/onlinepubs/9699919799/functions/isfinite.html

Gnulib module: isfinite

Portability problems fixed by Gnulib:

  * This macro is missing on some platforms: MacOS X 10.3, OpenBSD 3.8, AIX 5.1, IRIX 6.5, OSF/1 5.1, Solaris 10, Interix 3.5.

  * This macro incorrectly yields true for some double arguments, on some platforms: Linux/ia64 (signalling NaNs).

  * This macro incorrectly yields true for some long double arguments, on some platforms: x86 (pseudo-zeroes, unnormalized numbers, pseudo-denormals), x86_64 (pseudo-denormals), ia64 (pseudo-NaN, pseudo-Infinity, pseudo-zeroes, unnormalized numbers, pseudo-denormals).

Portability problems not fixed by Gnulib:

  * It is implementation-dependent whether isfinite raises an exception given a signaling NaN operand.