Mailinglist Archive: opensuse (4626 mails)

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Re: [opensuse] Re: Creating a swap file
  • From: "Theo v. Werkhoven" <theo@xxxxxxxxxxxxxxxxxxxx>
  • Date: Sat, 20 Jan 2007 22:37:00 +0100
  • Message-id: <20070120213700.GA8710@xxxxxxxxxxxxxxxx>
Sat, 20 Jan 2007, by robin.listas@xxxxxxxxxxxxxx:

>
> The Saturday 2007-01-20 at 11:26 +0100, Theo v. Werkhoven wrote:
>
> > > > Well, my instructors in the early '70's told me that a byte was
> > > > analogous to "bite" -- not the smallest "bit" accessible, but smaller
> > > > than the full-size "word" of most architectures of the time. And some
> > > > architectures do allow you direct access to a bit.
> >
> > 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.

Theo
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