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The Saturday 2007-01-20 at 22:37 +0100, Theo v. Werkhoven wrote:
> > > Why only some?
> > > Aren't shift- and logical operations part of all CPU architectures?
> >
> > That's not direct access to a bit, IMO. Direct access would be an
> > operation that would load into a register a certain bit, or another that
> > would compare directly to a certain bit in a byte in memory (in one op). I
> > have never seen it, though.
>
> That would be rather inefficient opcodes I think, and I can't think
> of any circumstance where that would be neccesary. Perhaps that's
> why you don't see it.
I think you can get those things in small cpus for small code size. I'm
just guessing. Microcontrollers, perhaps?
I have heard fo that "feature" previously, but I never seen it.
- --
Cheers,
Carlos E. R.
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