https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102078
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to David Binderman from comment #6) > I guess there are some machines where unsigned int is 64 bit. Even if there are (not aware of any such target), 1U << index would be enough for that. The code is non-portable only in hardcoding 8 as number of bits in a byte.