[webkit-dev] Bring back ARMv6 support to JSC

[Filip Pizlo]

> On Sep 5, 2017, at 10:51 AM, Olmstead, Don <Don.Olmstead at sony.com> wrote:
> 
> We have plans to add a JSC-Only windows bot in the very near future. Would that have any bearing on the state of JIT in Windows?

Not really. 

Because of the poor state of that code, I think we should rip it out.

Also maintaining the 32_64 value representation is no value for us. 

-Filip


> 
> -----Original Message-----
> From: webkit-dev [mailto:webkit-dev-bounces at lists.webkit.org] On Behalf Of Filip Pizlo
> Sent: Tuesday, September 5, 2017 8:37 AM
> To: Adrian Perez de Castro <aperez at igalia.com>
> Cc: webkit-dev at lists.webkit.org
> Subject: Re: [webkit-dev] Bring back ARMv6 support to JSC
> 
> There isn’t anyone maintaining the 32-not JIT ports to the level of quality we have in our 64-not ports. Making 32-bit use the 64-bit cloop would be a quality progression for actual users of 32-bit. 
> 
> -Filip
> 
>>> On Sep 5, 2017, at 8:02 AM, Adrian Perez de Castro <aperez at igalia.com> wrote:
>>> 
>>> On Tue, 5 Sep 2017 16:38:09 +0200, Osztrogonác Csaba <oszi at inf.u-szeged.hu> wrote:
>>> 
>>> [...]
>>> 
>>> Maybe it will be hard to say good bye to 32-bit architecutres for 
>>> many people, but please, it's 2017 now, the first ARMv8 SoC is out 4 
>>> years ago, the first AMD64 CPU is out 14 years ago.
>> 
>> While it's true that amd64/x86_64 has been around long enough to not 
>> have to care (much) about its 32-bit counterpart; the same cannot be said about ARM.
>> It would be great to be able to say that 32-bit ARM is well dead, but 
>> we are not there yet.
>> 
>> If we take x86_64 as an example, it has been “only” 10 years since the 
>> last new 32-bit CPU was announced and until 3-4 years ago it wasn't 
>> uncommon to see plently of people running 32-bit userlands. If things 
>> unroll in a similar way in the ARM arena, I would expect good 32-bit 
>> ARM support being relevant at least for another 3-4 years before the need starts to fade away.
>> 
>> If something, I think it may make more sense to remove 32-bit x86 
>> support, and have the 32-bit ARM support around for some more time.
>> 
>> Cheers,
>> 
>> 
>> --
>> Adrián 🎩
>> 
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