Formats for Vector Arithmetic Instructions under OP-V major opcode
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funct6 | vm | vs2 | vs1 | 0 0 0 | vd |1010111| OP-V (OPIVV)
funct6 | vm | vs2 | vs1 | 0 0 1 | vd/rd |1010111| OP-V (OPFVV)
funct6 | vm | vs2 | vs1 | 0 1 0 | vd/rd |1010111| OP-V (OPMVV)
funct6 | vm | vs2 | simm5 | 0 1 1 | vd |1010111| OP-V (OPIVI)
funct6 | vm | vs2 | rs1 | 1 0 0 | vd |1010111| OP-V (OPIVX)
funct6 | vm | vs2 | rs1 | 1 0 1 | vd |1010111| OP-V (OPFVF)
funct6 | vm | vs2 | rs1 | 1 1 0 | vd/rd |1010111| OP-V (OPMVX)
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