On Sun, Jan 16, 2000 at 10:01:47AM +1300, Chris Wedgwood wrote:
> Oh, I completely agree -- but perhaps we wanted to divide that 64-bit
> space into bit-regions which had some intrinsic meaning? It may sound
> really gross, but you never know.
>
> The main reason I mentioned this, was I imagine for most 64-bit
> platforms, accessing a 64-bit word as opposed to a 32-bit word is as
> cheap or cheaper and may allow various atomic operations.
I don't think so. Even for older Alphas which don't support sub-32-bit
accesses directly in hardware 32-bit and 64-bit objects can be directly
manipulated without overhead. 32-bit on the other side will safe you
some cache space.
Ralf
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