@node ilogb
@section @code{ilogb}
@findex ilogb

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/ilogb.html}

Gnulib module: ilogb

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
Minix 3.1.8, MSVC 9.
@item
This function returns a wrong result for a zero argument on some platforms:
OpenBSD 6.7, AIX 5.1.
@item
This function returns a wrong result for denormalized arguments on some platforms:
AIX 7.1 64-bit.
@item
This function returns a wrong result for an infinite argument on some platforms:
NetBSD 7.1, OpenBSD 6.7.
@item
This function returns a wrong result for a NaN argument on some platforms:
NetBSD 7.1, OpenBSD 6.7.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize