Re: Lua is faster than Java?

[Antero Vipunen <antero@...>]

Mike Pall wrote:

> Here's the timing on a code snippet which alternates between
> two opcodes (LOADBOOL and FORLOOP):
>
> $ TIMEFORMAT="%U"
> $ time lua -e 'local x; for i=1,1e8 do x = true end'
> 6.106
> $ time luajit -e 'local x; for i=1,1e8 do x = true end'
> 0.893
Superior! Both your project and your knowledge!

But it could be faster. I experimented with compiling  Lua to C few 
month ago.(I planned and still planning to move to asm)
My recipe was: 
   `unwind' VM-switch into linear program with gotos, and do some high 
level optimization based on my so-called soft-types-system and good 
thinking.

For example: if the step, limit and start of for are integers why then 
we use floating point arithmetic? If register where i-variable is stored 
is not used in for-body at all, then why we waste time boxing value it 
in the stackobject? Etc...
In my approach I trade dynamism and memory for speed.

Ad majorem Lua gloriam,
 Antero Vipunen.