[Webkit-unassigned] [Bug 103614] Optimizing RGBA16, RGB16, ARGB16, BGRA16 unpacking functions with NEON intrinsics

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103614


Zoltan Herczeg <zherczeg at webkit.org> changed:

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--- Comment #5 from Zoltan Herczeg <zherczeg at webkit.org>  2012-12-17 03:54:44 PST ---
(From update of attachment 179710)
View in context: https://bugs.webkit.org/attachment.cgi?id=179710&action=review

> Source/WebCore/platform/graphics/cpu/arm/GraphicsContext3DNEON.h:46
> +        uint16x8_t eightComponents = vld1q_u16(source + i);
> +        eightComponents = vshrq_n_u16(eightComponents, 8);
> +        vst1_u8(destination + i, vqmovn_u16(eightComponents));

I think this could be simplified to a simple read/write method without vshr. Just read an interleaved low/high component data, and write back the high component. Similar algorithm can be created to the other cases.

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