[webkit-dev] Concurrent JS and 32bit platforms

Filip Pizlo fpizlo at apple.com
Thu Apr 11 08:00:14 PDT 2019

> On Apr 11, 2019, at 7:03 AM, Xan <xan.lopez at gmail.com> wrote:
> Hi all,
> as part of our work on improving 32bit support in JSC we at Igalia are planning to have a look at enabling concurrent js

We don’t support concurrent JavaScript. 

We do have concurrent JITs and concurrent GC. 

> for these platforms. Before we dive in, though, we thought it would be better to ask some preliminary questions:
> - Was this feature only implemented for 64bit because that was the focus of the implementors moving forward? Or is there any fundamental difficulty in the current architecture? In particular we have seen some comments about atomic updates of JSValues that suggest it could be hard (or impossible) to get this done on 32bit with the current approach.

Can’t do atomic access to JSValues on 32-bit. That’s a showstopper. 

> - Assuming this is doable right now, we'll get on with it. Assuming it's not: would you be open to making the necessary changes to JSC to make concurrent js an option on 32bits?



> Thanks,
> Xan
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