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Neon Intrinsics in iOS

I have recently started using Neon intrinsics in my iOS image convolution code and have a shaky grasp at best. Right now, I get to the pixel data from CGBitmapContextGetData (cgctx); but I would like to take advantage of de-interleaving using vld4 (ARGB data). What is the best way to do this? I'm sure it's one of those simple things I am just not getting there with it!

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