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Also optimize / 4 and % 4. I assumed the compiler would do this automatically but the performance bump implies it's not doing that.
Before | Optimized
No dither: 4.8 ms | 3.5 ms
Dither : 9.6 ms | 4.2 ms
Before: https://drive.google.com[]file/d/0B07DogHRdEHcaXVobi1wZ2wxeUE/view?usp=sharing
After: https://drive.google.com[]file/d/0B07DogHRdEHcVS1PN05kaU1odm8/view?usp=sharing
Known issue: The remainder from the last Y pixel will leak into the first U pixel. Also U and V remainders leak into each other but I don't think it causes any perceptual difference.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=150255151
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