Hello Jan, On Tue, Sep 15, 2020 at 12:45 PM Zielinski, Jan <jan.zielin...@intel.com> wrote:
> > Is there any document for extending SWR for architectures other than > Intel? > > Unfortunately not. SWR was not architected to be portable beyond CPUs with > different levels of AVX ISAs. > > > It seems like SWR uses llvm_pipe shader creation, so is it still based > on tgsi IR to LLVM conversion? > > Yes, it is still based on TGSI. > > > Is there a path from NIR->LLVM (it seems so as per > https://phoronix.com/scan.php?page=news_item&px=LLVM-Switches-To-NIR-Default > ? > > For SWR no - it does not exist, at least not yet. From the top of my head, > I don't really know how much effort it would be to port SWR to NIR, but I > do plan to look into it. At some point... > > > Is the above idea possible at high-level? or I am missing lots of > important points? > > The most important point you may be missing is the fact that rasterization > in SWR is not based on LLVM. It based on AVX intrinsics (see code in > src/gallium/drivers/swr/rasterizer/core/). This is probably the biggest > problem if you target any other architecture. Most probably you would need > to rewrite the rasterizer to use LLVM IR or to some kind of language that > is based on LLVM and supports explicit vectorization, like ISPC. Rewriting > is most probably easier than convincing the community to introduce ISPC (or > any other new language) dependency to Mesa, though. ;-) > Thanks for the information. > > > Overall idea is to have SWR retargettable for any architecture that is > supported by LLVM codege and also don't want to use TGSI instead use NIR. > > Are you thinking about using SWR for Libre-SOC? > Yes but for now I am developing simple thing similar to https://github.com/baldurk/visor that is enough for experiments. > > BR, > Jan > > --------------------------------------------------------------------- > Intel Technology Poland sp. z o.o. > ul. Sowackiego 173 | 80-298 Gdask | Sd Rejonowy Gdask Pnoc | VII Wydzia > Gospodarczy Krajowego Rejestru Sdowego - KRS 101882 | NIP 957-07-52-316 | > Kapita zakadowy 200.000 PLN. > Ta wiadomo wraz z zacznikami jest przeznaczona dla okrelonego adresata i > moe zawiera informacje poufne. W razie przypadkowego otrzymania tej > wiadomoci, prosimy o powiadomienie nadawcy oraz trwae jej usunicie; > jakiekolwiek przegldanie lub rozpowszechnianie jest zabronione. > This e-mail and any attachments may contain confidential material for the > sole use of the intended recipient(s). If you are not the intended > recipient, please contact the sender and delete all copies; any review or > distribution by others is strictly prohibited. > >
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