dmd codegen improvements

[deadalnix via Digitalmars-d]

On Thursday, 3 September 2015 at 21:01:10 UTC, Ola Fosheim 
Grostad wrote:
> On Thursday, 3 September 2015 at 13:12:07 UTC, Adam D. Ruppe 
> wrote:
>> On Thursday, 3 September 2015 at 06:45:16 UTC, Jacob Carlborg 
>> wrote:
>>> There's a lot of stuff other languages can do that JS can't. 
>>> For example, classes, which a lot of developers prefer to use 
>>> in favor of the weird object system in JS.
>
> If you don't change the prototype object, then it is mostly 
> similar, but more flexible. Functions are constructors and 
> prototype objects are class definitions. You could also use 
> typescript, typescript playground is quite fun. It allows you 
> to explore the JS output in realtime.
>
>> You can kinda do classes in JS, it just isn't pretty syntax. 
>> In the D to JS toy I did, I just did an array of function 
>> pointers to handle the virtual functions, similar to how D is 
>> compiled to machine code.
>>
>> It'd be fairly ugly to write by hand but when converting 
>> languages, it works well enough.
>
> Huh? Dynamic languages have dynamic lookup, how is that 
> different from virtual functions?

Maybe because you need 2 map lookups + 1 indirection instead of 
an array lookup in addition of the indirect call.

But who know, with a vectorized SSA, it surely will be faster 
than light.