[RC5] keyrate stabilizing?

Test Man mr_nobby at yahoo.com
Mon Oct 22 14:50:31 EDT 2001


So if wanted a rotate you would have to do a couple of
shifts via the carry flag, right?

--- Dan Sugalski <dan at sidhe.org> wrote:
> At 11:34 PM 10/21/2001 -0700, Test Man wrote:
> >Is it really true that some CPUs do not have rotate
> >instructions? I mean, a rotate is effectively a
> shift
> >register - which is one of the fundamental blocks
> of
> >digital electronics. Even the Sinclair ZX80 had
> one!
> >And rotate/shift instructions are a very quick way
> of
> >multiplying or dividing by powers of 2.
> 
> Sure, none of the RISC chips these days have
> 'em--you won't find rotate in 
> a Sparc or Alpha instruction set, for example. 
> Rotate is *not* a shift, 
> however. You'll find all the CPUs have shifts, both
> left and right.
> 
> 					Dan
> 
> --------------------------------------"it's like
> this"-------------------
> Dan Sugalski                          even samurai
> dan at sidhe.org                         have teddy
> bears and even
>                                       teddy bears
> get drunk
> 
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