A new calling convention in VS2013

[bearophile]

Benjamin Thaut:

> I just wanted to say that there are currently bigger fish to 
> fry then micro optimization through calling convetions. (GC, 
> allocators, all the bugs...)

I understand and I agree. On the other hand I think there are 
things that (if desired) it's better to introduce sooner, despite 
some important bugs are not fixed, because they shape the future 
of D a bit.


> Did you compile the shown code with optimization enabled or is 
> that a debug build? If it is optimized I'M going to be 
> disappointed by LDCs codegen.

If you take a look at the original post I have used:

ldc2 -O5 -disable-inlining -release -vectorize-slp
-vectorize-slp-aggressive -output-s test.d

I think that's about the max optimization, I have also added some 
aggressive optimization switches introduced only the latest LLVM 
version (if you remove them the resulting asm of addParticles is 
about the same, but it reorders less better some of the 
instructions inside the dmain).

Bye,
bearophile