accessed via fields in misa

FMUL.D 0001101 rs2 rs1 010 rd 0101111 AMOMINU.W 11100 aq rl rs2 rs1 001 rd 0000111 FLH imm[11:5] rs2 rs1 101 rd 0110011 SLL 0000000 rs2 rs1 funct3 rd opcode R4-type imm[11:0] rs1 funct3 rd opcode I-type imm[11:5] rs2 rs1 000 rd 1010011 FCVT.D.Q 0100011 00001 rs1 rm rd 1000111 FMSUB.H rs3 10 rs2 rs1 funct3 imm[4:1|11] opcode B-type

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