[webkit-dev] Webkit port to ppc64le.

[Atul Sowani]

Sure, thanks @Konstantin. So I will first attempt having working JIT on
ppc64le. Your comments definitely helped in deciding the direction for
porting. Thanks! :)

On Wed, Feb 22, 2017 at 8:28 PM, Konstantin Tokarev <annulen at yandex.ru>
wrote:

>
>
> 22.02.2017, 17:41, "Atul Sowani" <sowani at gmail.com>:
> > So, essentially, some tweaking in the code of LLInt/interpreter _is_
> required when porting it to the new platform. Is my understanding correct?
>
> Yes. In order to port LLInt you should implement offlineasm backend. See
> for example arm.rb, arm64.rb, mips.rb in Source/JavaScriptCore/offlineasm/.
> You may also need arch-specific adjustements in
> Source/JavaScriptCore/llint, though it's better to minimize their number.
>
> My point was that you don't have to port LLInt before you have working
> JIT. AFAIU main purpose of architecture-specific LLInt implementation is to
> provide interpreter with the same calling convention as JIT, not to make
> interpreter faster on its own.
>
> See also https://trac.webkit.org/wiki/JavaScriptCore
>
> > On Wed, Feb 22, 2017 at 4:11 PM, Konstantin Tokarev <annulen at yandex.ru>
> wrote:
> >
> >> 22.02.2017, 13:15, "Atul Sowani" <sowani at gmail.com>:
> >>> Hi,
> >>>
> >>> This is not specific to any particular branch/version of WebKit. I was
> browsing the code with ppc64le porting in mind. By default JIT is not
> available on ppc64le, so the CLoop code is used instead.
> >>>
> >>> I see there is low level interpreter code in qtwebkit/Source/JavaScriptCore/llint
> directory and inside qtwebkit/Source/JavaScriptCore/interpreter directory
> (AbstractPC, CallFrame etc.). I am wondering if one needs to touch this
> code as well to make it work correctly on ppc64le.
> >>
> >> Porting JIT to new platfrom does not require porting LLInt, it can work
> without interpreter tier. However, it is a good idea to port LLInt after
> you have JIT in place, to improve overall quality.
> >>
> >>>
> >>> Any comments/suggestions?
> >>>
> >>> Thanks,
> >>> Atul.
> >>> ,
> >>>
> >>> _______________________________________________
> >>> webkit-dev mailing list
> >>> webkit-dev at lists.webkit.org
> >>> https://lists.webkit.org/mailman/listinfo/webkit-dev
> >>
> >> --
> >> Regards,
> >> Konstantin
> > ,
> >
> > _______________________________________________
> > webkit-dev mailing list
> > webkit-dev at lists.webkit.org
> > https://lists.webkit.org/mailman/listinfo/webkit-dev
>
>
> --
> Regards,
> Konstantin
>
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