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Which of the instruction sequences is equivalent to the following expression?

If (\$t1 != \$t2), then \$t3 = \$t3 - 1.

A.
```
beq $t1, $t2, L1
addi $t3, $t3, -1
L1:
```

B.
```
beq $t1, $t2, L1
sub $t3, $t3, 1
L1:
```

C.
```
bne $t1, $t2, L1
addi $t3, $t3, -1
L1:
```

D.
```
bne $t1, $t2, L1
sub $t3, $t3, 1
L1:
```

Answer :

The equivalent instruction sequence to the given expression is option C: bne $t1, $12, L1, addi $13, $13, -1, L1:

In the expression, the condition is checking if $tt is not equal to $t2. The corresponding instruction in option C is "bne $t1, $12, L1", which branches to label L1 if $t1 is not equal to $12.

If the condition is true (i.e., $tt is not equal to $t2), it executes the next instruction "addi $13, $13, -1" in option C, which subtracts 1 from $13. Finally, the code jumps to the label L1.

Therefore, option C provides the equivalent instruction sequence for the given expression.

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