L3因为是人车共驾，责任划分、保险赔付等方方面面都需要考虑到。而L4不存在这个问题，出了事就是厂家负责。因为责任明晰，所以落地争议也较少，这就是现状。但是只要法律层面解决L3的责任划分问题，大规模普及也并不是遥遥无期。
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On the predecode side, X925’s TRM suggests the L1I stores data at 76-bit granularity. Arm instructions are 32-bits, so 76 bits would store two instructions and 12 bits of overhead. Unlike A725, Arm doesn’t indicate that any subset of bits correspond to an aarch64 opcode. They may have neglected to document it, or X925’s L1I may store instructions in an intermediate format that doesn’t preserve the original opcodes.