http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21110
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-02-04
00:52:00 UTC ---
The number of low order bits is machine-dependent but is
normally the number of bits in a @code{Pmode} item minus the number of
bits set by @code{high}.
@var{m} should be @code{Pmode}.
The last part is what is incorrect.
