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

[Geoffrey Garen]

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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