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The x86_64 architecture uses variable-length byte sequences, from 1 to approximately 17 bytes.
The AArch64 architecture uses 32-bit long instructions. Since this instruction length is insufficient to adequately contain a 64-bit operand (such as an address), some operands are encoded using run-length encoding (RLLRLE) or shifted-bitfield techniques. For certain operand values, it may be necessary to build the required value in a register with a few instructions.
