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RISC-V Instruction Set Manual, Volume I: RISC-V User-Level ISA , Priv-v1.12 2021/12/03
inst[4:2] 000 001 010 011 100 101 110 111
inst[6:5] ( > 32b)
00 LOAD LOAD-FP custom-0 MISC-MEM OP-IMM AUIPC OP-IMM-32 48b
01 STORE STORE-FP custom-1 AMO OP LUI OP-32 64b
10 MADD MSUB NMSUB NMADD OP-FP reserved custom-2/rv128 48b
11 BRANCH JALR reserved JAL SYSTEM reserved custom-3/rv128  ≥ 80b