9.409 ilogbf

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

Gnulib module: ilogbf

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, MSVC 9.
• This function returns a wrong result for a zero argument on some platforms: OpenBSD 4.9.
• This function returns a wrong result for an infinite argument on some platforms: NetBSD 5.1, OpenBSD 4.9.

Portability problems not fixed by Gnulib: