Re: [C++0x] contiguous bitfields race implementation

[Aldy Hernandez]

I think the adjustment above is intended to match the adjustment of the
address by bitregion_start/BITS_PER_UNIT, but the above seems to assume
that bitregion_start%BITS_PER_UNIT == 0.

That was intentional.  bitregion_start always falls on a byte boundary, 
does it not?

struct {
        stuff;
        unsigned int b:3;
        unsigned int other_bits:22;
        other_stuff;
}

Does not "b" always start at a byte boundary?