[webkit-dev] NEON_INTRINSICS

Benjamin Poulain benjamin at webkit.org
Mon Mar 9 13:51:28 PDT 2015

This is quite different from legacy features we remove all the time. 
This simple valuable code that happen to be untested because of the lack 
of ARMv7 infrastructure on the public bots.

Regarding maintenance, I'd be happy to fix bugs in that code.


On 3/9/15 11:34 AM, Maciej Stachowiak wrote:
> Requiring a perf bot to be set up before removing unmaintained code
> seems like a really high bar. What would it take to do a one-shot
> test of whether NEON_INTRINSICS is a perf benefit? Would it show up
> on PLT or on JS perf benchmarks if you compiled with it? If it’s not
> a speedup in its existing form, then it’s probably not worth keeping
> around. If it is, then that might be incentive for someone to get it
> production-ready and on by default for relevant platforms.
> Regards, Maciej
>> On Mar 8, 2015, at 6:56 PM, Benjamin Poulain <benjamin at webkit.org>
>> wrote:
>> That code looks straightforward, the maintenance cost is likely
>> low. We just really need a test bot to run that code.
>> I suggest we wait until we have a ARMv7 perf bot and re-evaluate
>> On 05/03/2015 22:27, Carlos Garcia Campos wrote:
>>> Yesterday a patch was submitted to fix the build with
>>> NEON_INTRINSICS, and Ossy pointed out that the build has been
>>> broken since r170433, and nobody has noticed it until now. So
>>> that makes me wonder if anybody is actually using that and if it
>>> even works, because otherwise we should probably remove the
>>> So, is there anybody actually using that (I guess patched
>>> downstream)?
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