[ryao]

Do you have one that can explain the operand syntax for the instructions that have operands starting with 'v' here:

https://gcc.godbolt.org/z/16a91n4zc

[murderfs]

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/Fundamen...