[webkit-dev] [jsc-dev] Proposal: Using LLInt Asm in major architectures even if JIT is disabled

Guillaume Emont guijemont at igalia.com
Fri Sep 21 09:44:15 PDT 2018

Quoting Yusuke Suzuki (2018-09-21 10:10:59)
> Yeah, I'm not planning to enable LLInt ASM interpreter on 32bit architectures
> since no buildbot exists for this configuration.

I'm confused. Do you mean you don't want to enable LLint instead of
CLoop, for the case when JIT is disabled on 32-bit architectures?
FTR, the configuration LLInt(with offlineasm)+jit+dfg is tested in
32-bit testbots for at least mips, armv7 and x86.

> And we should make 32bit architectures JSVALUE64, so LLInt JSVALUE32_64 should
> be removed in the future.

See what Filip and Michael were saying. We believe that we need
JSVALUE32_64, and we are willing to maintain it, as the performance gap
between LLInt or CLoop and JIT+DFG on 32-bit architectures is


> On Fri, Sep 21, 2018 at 2:33 AM Michael Catanzaro <mcatanzaro at igalia.com>
> wrote:
>     On Thu, Sep 20, 2018 at 12:02 PM, Filip Pizlo <fpizlo at apple.com> wrote:
>     > - Enable cloop/JSVALUE64 to work on 32-bit.  I don’t think it does
>     > right now, but that’s probably trivial to fix.
>     > - Switch Darwin ports to that configuration for 32-bit.
>     > - When changes land to support new features, make it mandatory to
>     > support JSVALUE64 and optional to support JSVALUE32_64.  Such changes
>     > should include whoever volunteers to maintain JSVALUE32_64 in CC.
>     >
>     > If you guys consider JSVALUE32_64 to be critical, then you can go
>     > ahead and maintain it.  We’ll let JSVALUE32_64 stay in the tree so
>     > long as someone is maintaining it.
>     Yes that's fine with us. I think that's the previous agreement, anyway.
>     :)
>     Michael
> --
> Best regards,
> Yusuke Suzuki

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