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Answer:

not $s1,$t5     =     nor $s1, $t5, $0

The order of $t5 and $0 could be reversed. (You could also say $zero rather than $0.)


Implicit Immediate Operand

Some pseudoinstructions translate into different basic instructions depending on the type of operands. A pseudoinstruction used with an immediate operand translates into different basic instructions than one used with all register operands.

Sometimes the same mnemonic is used for a basic instruction and also for a pseudoinstruction. For example, you can use the mnemonic or for an or with register operands and also for an or with an immediate operand:

or $s0,$s1,0x00ff      translates into:      ori $s0,$s1,0x00ff

Here, the extended assembler notices the immediate operand and translates the instruction into an ori basic instruction. The resulting machine code is a 32-bit or immediate. However, the following is a basic instruction:

or $s0,$s1,$t1 

This assembly instruction is not changed. The resulting machine code is a 32-bit or instruction.

The mnemonic and is similar. It might call for the basic instruction and, or the basic instruction andi, or other basic instructions depending on the operands.


QUESTION 3:

Is there both a basic add instruction and an add immediate instruction?