none (none.delete@this.none.com) on July 11, 2013 5:58 am wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on July 11, 2013 5:33 am wrote:
> [...]
> > I don't follow. How disassembly tells us anything about denormals handling?
> > It's in control flags that we can't see.
>
> It doesn't. But as I had read that some people thought that the Android x86 version was
> using x87 (the Windows 32-bit version does use x87), I thought it made sense to say it.
>
> > > Now if you can also explain with denormals why CT+ is beaten by A15 and
> > > Krait even for single threaded integer tasks, I'm very interested :-)
> > >
> >
> > It's beaten by the margin that one would expect:
> > http://browser.primatelabs.com/geekbench2/compare/2122693/1970335
> > http://browser.primatelabs.com/geekbench2/compare/2147177/1970335
> > The difference is probably very similar to the difference in power consumption. Which, of course, means
> > that A15 and Krait are better CPUs since they got equal perf/Watt with higher absolute performance.
>
> Which makes me think I have always found the Lua score odd. ARM chips are doing very
> well on it (even a Cortex-A9 @ 1.4 GHz crushes a CT+ @ 2.0 GHz), and I wonder why.
>
> http://browser.primatelabs.com/geekbench2/compare/2085507/1970892
>
> The sum of the single-threaded benches is 4482 for the A9 and 4371 for the Z2580.

Yes, Saltwell Lua score is relatively worse than on other cores.
I calculated Lua-to-single-thread-geomin ratio for various small processors:

Saltwell   (1970335) - 1.22

Cortex-A8  (2078698) - 1.33

Bobcat-C50 (2055818) - 1.42

Swift      (2146483) - 1.44

Scorpion   (2146668) - 1.49

Cortex-A15 (2125889) - 1.54

Cortex-A9  (2147771) - 1.76

Krait      (2147597) - 1.89

And the one from the premier league:

Ivy Bridge (2035037) - 1.98