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That link is from 2012, that is when the ARMv8 architecture was released, so there was not a lot of information about it. The ARMv8 instruction sets · Arithmetic instructions generally accept a 12-bit immediate constant. · Logical instructions generally accept a 32-bit or 64-bit Tell you more about A64, an instruction set which is going to be instructions and can be easier to digest than the ARMv8-A Architecture Reference Manual.Using 32bit instruction encodings. T32 („T“ for Thumb). Variable-length instruction set. Using 16- & 32bit instruction encoding