class SVP64PrefixFields(SelectableIntMapping):
    def __init__(self):
        super().__init__(value=0, bits=32, fields={
            # 6 bit major opcode EXT001, 2 bits "identifying" (7, 9), 24 SV ReMap
            "major": range(0, 6),
            "pid": (7, 9),
            # SVP64 24-bit RM (ReMap)
            "rm": ((6, 8) + tuple(range(10, 32))),
        })
        self.insn = self