> As an interum, the i386 method should be changed to move bit fields
> around.  We're talking about quantities that line up as nice
> bitmasks, yet it does multiplication and division.

If multiplication and division by powers of two don't turn into shifts,
we seriously need a better compiler.  That's really rudimentary
optimization, the sort of thing I would expect a compiler to do even
without specifically enabling optimization.

At worst it might be necessary to add some casts, or use inline
functions, to make the operands have unsigned types.

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