[OT] My C++ talk at GoingNative 2013

[PauloPinto]

On Tuesday, 10 September 2013 at 13:20:18 UTC, Iain Buclaw wrote:
> On 10 September 2013 11:10, deadalnix <deadalnix at gmail.com> 
> wrote:
>> On Monday, 9 September 2013 at 16:43:54 UTC, Andrei 
>> Alexandrescu wrote:
>>>
>>>
>>> http://www.reddit.com/r/programming/comments/1m1izv/goingnative_2013_writing_quick_code_in_c_quickly/
>>>
>>> Andrei
>>
>>
>> So I'll jump in as I've seen the conf before that post.
>>
>> It is really worthwhile to watch. Quite informative on the 
>> technical side
>> (funilly, I did implement the solution presented in the 
>> devirtualization
>> part on a platform where virtual function were not available 
>> because of
>> crappy compiler, but had no idea it was worthwhile for speed, 
>> it wasn't the
>> goal so I never measured, and it also may not the case on the 
>> given
>> plateform).
>>
>
> Interestingly enough, gcc recently added (about a month before 
> Andrei
> did the talk) a new interprocedural analysis pass that sets all
> methods that can be devirtualised.  I expect that LLVM have 
> something
> cooking up for this too.  As of yet, I haven't ran any tests 
> which
> show that this works though...

The main problem with devirtualization is that you can only have 
full benefits when targeting VM based environments.

With native generated code, it is only possible to apply 
devirtualization on static linked code.

--
Paulo