This function is missing on some platforms:
Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 9, MSVC 9.
@item
-This function returns a wrong value for the argument -1.0f on some platforms:
+This function returns a wrong value for the argument @code{-1.0f} on some platforms:
IRIX 6.5.
@end itemize