[RC5] AXP client slow on RC5
greg at wooledge.org
Sat Jun 2 09:36:33 EDT 2001
Dan Sugalski (dan at sidhe.org) wrote:
> On Fri, 1 Jun 2001 chicks at chicks.net wrote:
> > On Sat, 2 Jun 2001 bmeyer at cs.monash.edu.au wrote:
> > > P.S.: Can someone come up with a use of the rotate instruction outside
> > > of cryptography?
> > - Dividing or multiplying integers by two. :-) Of course, most ALU's
> > optimize that sort of trickery into irrelevance these days.
> > - Getting at the return value of a system() in C.
> Neither of those are rotates. Shifts, yes, but not rotates.
I think rotates might be useful in some pseudo random number generation
algorithms. But I don't know any PRNG algorithms (or parameters) that
are tied to the computer's word size like that -- most use a "strange"
number of bits, often much larger than the CPU word size.
Greg Wooledge | "Truth belongs to everybody."
greg at wooledge.org | - The Red Hot Chili Peppers
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