Question

Question: For each MIPS instruction, show the value of the opcode(OP), source register(RS), and target register(RT) fields. For the I-type instructions, show the value of the immediate field, and for the R-type instructions, show the value of the destination register(RD) field.

addi \(t0,\)s6,4

add \(t1.\)s6,\(0

sw \)t1, 0(\(t0)

lw \)t0,0(\(t0)

add \)s0,\(t1,\)t0

Short answer

Instruction type,opcode, source and target for each instruction is given as follows:

Instructions	Type	OP	RS	RT	RD	immediate
addi $t0,$s6,4	I-type	8	22	8		4
add $t1,$s6, $0	R-type	0	22	0	9
sw $t1, 0($t0)	I-type	43	8	9		0
lw $t0, 0($t0)	I-type	35	8	8		0
add $s0,$t1,$t0	R-type	0	9	8	16

Step-by-step solution

Determine the MIPS instruction format types and Fields.

The MIPS instructions has the layout that is called the instruction format. There are two types of instructions R-type and I-Type.

R-type refers to the instructions that use registers for operations.

I-type refers to the instructions that use immediate value.

Fields of R-type is as follows:

OP	rs	rt	rd	shamt	function

Fields of I-type is as follows:

OP	rs	rt	Constant/address

Determine the MIPS Instruction type and fields of the given instruction

Given Instructions:

addi $t0,$s6,4

add $t1.$s6,$0

sw $t1, 0($t0)

lw $t0,0($t0)

add $s0,$t1,$t0

The instruction type and fields are as follows:

Instruction addi $t0,$s6,4:

Instructions	Type	OP	RS	RT	RD	immediate
addi $t0,$s6,4	I-type	8	22	8		4

The above instruction is I-type , since, it has immediate value of 4. The opcode of addi instruction is 8. The value of source register is 22 and the target register is 8. The immediate value 4 will be added to the value of source register and the result will be stored in target register.

Instruction :add $t1.$s6,$0

Instructions	Type	OP	RS	RT	RD	immediate
add $t1,$s6, $0	R-type	0	22	0	9

The above instruction is R-type , since the values are added by the registers. The value of opcode is 0 and the value of source register is 22. The value of destination register is 9.

Instructions:sw $t1, 0($t0)

lw $t0,0($t0)

Instructions	Type	OP	RS	RT	RD	immediate
sw $t1, 0($t0)	I-type	43	8	9		0
lw $t0, 0($t0)	I-type	35	8	8		0

Both the above instructions are I-Type , because they have immediate type addressing.

Sw instruction will store the data at the specified address with the possible offset, from a source register. The Opcode is 43 and the value of source and target registers are 8 and 9 respectively.

Lw instruction loads the word to the specified address. The Opcode is 35 and the value of source and target registers are 8 and 8 respectively.

Instruction: add $s0,$t1,$t0

Instructions	Type	OP	RS	RT	RD	immediate
add $s0,$t1,$t0	R-type	0	9	8	16

The above instruction is R-type , since the values are added by the registers. The value of opcode is 0 and the value of source register is 9. The value of target register is 8 and the destination register has 16.