<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>You have to port the llint either way since even the JIT relies on some llint code. <br><br>-Filip</div><div><br>On Feb 22, 2017, at 07:22, Atul Sowani <<a href="mailto:sowani@gmail.com">sowani@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">Sure, thanks @Konstantin. So I will first attempt having working JIT on ppc64le. Your comments definitely helped in deciding the direction for porting. Thanks! :)<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 22, 2017 at 8:28 PM, Konstantin Tokarev <span dir="ltr"><<a href="mailto:annulen@yandex.ru" target="_blank">annulen@yandex.ru</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
22.02.2017, 17:41, "Atul Sowani" <<a href="mailto:sowani@gmail.com">sowani@gmail.com</a>>:<br>
<span class="">> So, essentially, some tweaking in the code of LLInt/interpreter _is_ required when porting it to the new platform. Is my understanding correct?<br>
<br>
</span>Yes. In order to port LLInt you should implement offlineasm backend. See for example arm.rb, arm64.rb, mips.rb in Source/JavaScriptCore/<wbr>offlineasm/. You may also need arch-specific adjustements in Source/JavaScriptCore/llint, though it's better to minimize their number.<br>
<br>
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.<br>
<br>
See also <a href="https://trac.webkit.org/wiki/JavaScriptCore" rel="noreferrer" target="_blank">https://trac.webkit.org/wiki/<wbr>JavaScriptCore</a><br>
<div class="HOEnZb"><div class="h5"><br>
> On Wed, Feb 22, 2017 at 4:11 PM, Konstantin Tokarev <<a href="mailto:annulen@yandex.ru">annulen@yandex.ru</a>> wrote:<br>
><br>
>> 22.02.2017, 13:15, "Atul Sowani" <<a href="mailto:sowani@gmail.com">sowani@gmail.com</a>>:<br>
>>> Hi,<br>
>>><br>
>>> 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.<br>
>>><br>
>>> I see there is low level interpreter code in qtwebkit/Source/<wbr>JavaScriptCore/llint directory and inside qtwebkit/Source/<wbr>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.<br>
>><br>
>> 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.<br>
>><br>
>>><br>
>>> Any comments/suggestions?<br>
>>><br>
>>> Thanks,<br>
>>> Atul.<br>
>>> ,<br>
>>><br>
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>><br>
>> --<br>
>> Regards,<br>
>> Konstantin<br>
> ,<br>
><br>
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<br>
-- <br>
Regards,<br>
Konstantin<br>
</div></div></blockquote></div><br></div>
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