[webkit-dev] Anyone using NEON code on ARM builds?

Zoltan Herczeg zherczeg at webkit.org
Wed Mar 21 10:03:22 PDT 2012


btw if anyone interested about the details of this optimization you can
read more about it here:



> Hi Jonathan,
> On 21/03/2012, at 12:56 AM, Jonathan Kliegman wrote:
>> On Wed, Mar 14, 2012 at 2:14 PM, Dean Jackson <dino at apple.com> wrote:
>> Hi,
>> There are three files with embedded NEON code to speed up filters:
>> ./Source/WebCore/platform/graphics/filters/arm/FECompositeArithmeticNEON.{h,cpp}
>> ./Source/WebCore/platform/graphics/filters/arm/FEGaussianBlurNEON.{h,cpp}
>> ./Source/WebCore/platform/graphics/filters/arm/FELightingNEON.{h,cpp}
>> Are any ARM ports using this? (would require SVG and FILTERS both
>> enabled) If so, could you contact me? Off list is fine.
>> I see the code came from Felician Marton via Zoltan reviewed by Dirk
>> (eg. https://bugs.webkit.org/show_bug.cgi?id=65522) and it's been very
>> slightly touched for some chromium build issues.
>> Chrome OS has ports that use NEON and has SVG and FILTERS both enabled
>> so this would still be used.
> Excellent!
> Zoltan and I have been chatting offline a bit. I was testing compilation
> on Darwin/iOS ARM and running into a few issues. The first was about
> alignment errors from the compiler. The second was some linking issues,
> for example:
>> https://bugs.webkit.org/show_bug.cgi?id=81568
> Is there someone (you?) on the Chrome team I should CC on any bugs raises?
> Dean
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