[webkit-dev] Drop x86 (32bit) JIT backend

[Yusuke Suzuki]

I uploaded the patch for this change.
https://bugs.webkit.org/show_bug.cgi?id=201790 <https://bugs.webkit.org/show_bug.cgi?id=201790>

-Yusuke

> On Sep 13, 2019, at 15:09, Geoffrey Garen <ggaren at apple.com> wrote:
> 
> No objection.
> 
> Geoff
> 
>> On Sep 13, 2019, at 1:39 PM, Yusuke Suzuki <ysuzuki at apple.com> wrote:
>> 
>> Hello all,
>> 
>> Now, Xcode no longer has ability to build 32bit binary.
>> Fedora starts dropping x86 32bit kernel shipping.
>> Our x86/x86_64 JIT requires SSE2, so such CPUs can use JIT if they want by switching x86 to x86_64.
>> And these CPUs are modern enough to run CLoop at high speed.
>> 
>> x86 32bit JIT backend is very complicated and is being a major maintenance burden.
>> This is due to very few # of registers. Which scatters a lot of isX86 / CPU(X86) in Baseline, DFG, and Yarr.
>> I’m now planning to optimize some part of Yarr, but x86 YarrJIT is being a major barrier of such cleanups / optimizations.
>> 
>> So, I would like to propose dropping X86 32bit JIT support.
>> 
>> -Yusuke
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> 

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