Those are NEON registers. v0.2d is the vector register v0, interpreted as two double words (i.e. two 64-bit elements). ARM's documentation for this kind of thi

Those are NEON registers. v0.2d is the vector register v0, interpreted as two double words (i.e. two 64-bit elements). ARM's documentation for this kind of thing is fairly good if you can find it: https://developer.arm.com/documentation/102474/0100/Fundamentals-of-Armv8-Neon-technology https://developer.arm.com/documentation/102474/0100/Fundamen...