Re: Lua/LuaJIT2 performance on Android

[KHMan <keinhong@...>]

On 4/19/2011 11:58 PM, Adam Strzelecki wrote:
> > Could the JIT use such optimizations automatically, or maybe at
> > least
> > remove the intermediate __add and bit.* calls operating on the
> > integers
> > directly?
>
> It already there, quoting Mike's earlier response: "The ARM port
> uses the dual-number mode of LuaJIT. All Lua numbers
> are represented either as integers or doubles internally. This is
> transparent to the user of the VM. Except for the performance
> effects, of course: e.g. 'for i=1,1e7 do end' runs much faster
> than 'for i=1.5,1e7 do end'."

IIRC, Michal was talking about inferring and accelerating fixed 
point arithmetic, which is a legit question that goes further than 
what you have quoted in the above.

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia