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ARMv8 A64 Quick Reference. Arithmetic Instructions X30 = PC + 4; PC += rel±. 27:2:02 AArch64 Instruction Set Attribute {0,1} RO,64. So what has been changed in ARMv8, if ARMv7+LPAE solves the 4GB limitations? ARM | Fundamentals of the ARMv8 Architecture 4. Added descriptions for Armv8.4-A related commands: BMC.. processor architecture, please refer to “ARM Debugger” (debugger_arm.pdf).4. What's new in ARMv8-A? ▫ ARMv8-A introduces two execution states: AArch32 and AArch64 AArch64 has four exception levels, and two security states.