Re: [Tinycc-devel] Request: __attribute__((vector_size))

[ian]

Hi Michael.
Is the support for data structures and calculations a real "need to" for a compiler ????

regards,

ian

Le 06/01/2020 à 20:36, Michael Matz a écrit :

> Hello,
>       
>       
>       On Mon, 6 Jan 2020, Rasmus Riiner via Tinycc-devel wrote:
>       
>       
> > See here:
> >         https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html
> >         
> >         
> >         This is one of those things that doesn't come up in a lot of
> >         types of programming, but is indispensable in some, namely
> >         anything to do with 2D or 3D math. The ability to just write
> >         `position += velocity * dt;` style statements might be one of
> >         the most important reasons most game developers choose C++ over
> >         C. It's certainly the only thing keeping me from using TCC in
> >         the development of my own project.
> >         
> >         
> >         Actually emitting SSE instructions might be beyond the scope of
> >         tcc (Tiny after all), supporting the expressions though would be
> >         a huge help.
> >         
> >       
>       
>       Without proper support in the backends for vector instructions the
>       generated code for this extension from TCC would be of abysmal
>       quality. Technically it wouldn't be too much work to semantically
>       support that, but the values would need to be committed to memory
>       (instead of vector registers) and regarded as constant sized
>       arrays (at which point the function call ABI would be different
>       from the respective native ABI, which, again, would be hard to fix
>       without proper support for vector insns in the backends).
>       
>       
>       That extension really doesn't feel very well suited for a simple
>       compiler like TCC ;-)  But perhaps it can be done non-intrusively
>       enough.
>       
>       
> > I sat down yesterday in an attempt to do
> >         this myself, but it turns out I'm not good enough for the job. I
> >         couldn't make heads or tails of it. However, this might be a
> >         breeze for someone that knows TCC like the back of their hand.
> >         
> >         
> >         So, any takers?
> >         
> >       
>       
>       
>       Ciao,
>       
>       Michael.
>       
>       
>       _______________________________________________
>       
>       Tinycc-devel mailing list
>       
>       address@hidden
>       
>       https://lists.nongnu.org/mailman/listinfo/tinycc-devel
>       
>

--
-- address@hidden
-- Développeur compulsif