The atomic trick was very satisfying, especially extrapolating the swizzle instruction from the PowerVR heritage. I don't know but wouldn't be surprised if the Apple engineers are learning from this or at least they would appreciate the sheer cleverness. It reminds me when back in the day, the Sega Genesis video hardware was reverse engineered at Accolade and our engineers used the public Texas Instruments TMS9918 VDP documentation as a starting point to extrapolate the evolved 9918 derived VDP in the Genesis (Mega Drive).