ilogb
=====

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/ilogb.html

Gnulib module: ilogb

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: Minix 3.1.8, MSVC 9.

  * This function returns a wrong result for a zero argument on some platforms: OpenBSD 6.7, AIX 5.1.

  * This function returns a wrong result for denormalized arguments on some platforms: Mac OS X 10.5 64-bit, AIX 7.1 64-bit.

  * This function returns a wrong result for an infinite argument on some platforms: NetBSD 7.1, OpenBSD 6.7.

  * This function returns a wrong result for a NaN argument on some platforms: NetBSD 7.1, OpenBSD 6.7.

Portability problems not fixed by Gnulib: