These numbers correspond to the $X representation of a register, such as $0 or $31. Rs, rt, rd The numeric representations of the source registers and the destination register. The opcode field is 6 bits long (bit 26 to bit 31). Several related instructions can have the same opcode. Opcode The opcode is the machinecode representation of the instruction mnemonic. In the main narrative of this book, the operands will be denoted by these names.Ĭonverting an R mnemonic into the equivalent binary machine code is performed in the following way: opcode Where the values in $s2 and $s3 are added together, and the result is stored in $s1. As an example, the add mnemonic can be used rs, and rt are the source registers, and rd is the destination register. Where "OP" is the mnemonic for the particular instruction. R instructions are used when all the data values used by the instruction are located in registers.Īll R-type instructions have the following format: OP rd, rs, rt
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